CN110358599A - A kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction - Google Patents
A kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction Download PDFInfo
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- CN110358599A CN110358599A CN201910635273.6A CN201910635273A CN110358599A CN 110358599 A CN110358599 A CN 110358599A CN 201910635273 A CN201910635273 A CN 201910635273A CN 110358599 A CN110358599 A CN 110358599A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/002—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal in combination with oil conversion- or refining processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
- C10L5/447—Carbonized vegetable substances, e.g. charcoal, or produced by hydrothermal carbonization of biomass
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1011—Biomass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
Abstract
The invention discloses a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction, including agriculture and forestry organic waste material pretreatment, slurries the pre-heat treatment, hydro-thermal dealkalize charing, solid-liquid separation treatment, dehydration and drying processing, heat recovery and dealkalize water circulation use；By controlling the raw material and reaction condition of hydro-thermal reaction, make the lower low heating value of utility value, the agriculture and forestry organic waste material of high basic metal content is converted into high calorific capacity, the high-quality hydro-thermal charcoal of low alkali metal content；And by reaction waste heat and by-product recycle, energy consumption can be reduced and improve resource utilization, reduced environmental pollution；Disposed of in its entirety process efficiency is high, low energy consumption, hydro-thermal charcoal obtained can be used as a kind of good clean fuel use, so that agriculture and forestry organic waste material utility value is promoted, with positive economic significance and ecological significance.
Description
Technical field
The present invention relates to agriculture and forestry organic waste materials to utilize technical field, discarded more particularly to a kind of agricultural based on hydro-thermal reaction
Object dealkalize charing method.
Background technique
Agriculture and forestry organic waste material is the by-product that agriculture, woods class industry generate during production and processing, enormous amount, type
It is various, also, with the fast development of agricultural economy and being constantly progressive for science and technology, crop yield is continuously improved, agricultural production
Product secondary industry is also quickly grown so that various agriculture and forestry organic waste material quantity are continuously increased, but due to technology, tradition and idea etc. because
The limitation of element, it is currently still relatively low to the utilization rate of agriculture and forestry organic waste material.And agriculture and forestry organic waste material is as a kind of reproducible biomass
The energy, is largely burnt or is discarded, and the serious waste of biomass resource is not only caused, but also increases the row of greenhouse gases
It puts, exacerbates the pollution to environment.Therefore, it is necessary to reasonably be developed and used to agriculture and forestry organic waste material, to improve resource benefit
With rate, and reduce environmental pollution.
It is currently charing upgrading to the main Land use systems of agriculture and forestry organic waste material, and charing upgrading technology common at present includes
Pyrolysis charring and hydro-thermal charing.Wherein, pyrolysis charring upgrading technology is to keep agriculture and forestry organic waste material continuous under the conditions of nonoxidizing atmosphere
The physical-chemical reaction of a series of complex occurs for heating, removes partial moisture and volatile matter, to obtain calorific capacity height, powder processed
Function admirable biomass pyrolytic carbon, but since pyrolytic process ash content cannot remove, cause content of ashes in pyrolysis biomass carbon to increase
Add, especially alkali metal content is high, therefore limits the application of biomass pyrolytic carbon.And hydro-thermal charing is fast in recent years
A kind of agriculture and forestry organic waste material of speed development carbonizes upgrading technology, and hydro-thermal carbonization process and the important difference of pyrolytic reaction process are its institutes
The reaction of initiation is carried out under the medium of high-temperature liquid-phase water, is carried out by placing in autoclave agriculture and forestry organic waste material with water
Heating, provides saturated vapor pressure by water, the moisture inside agriculture and forestry organic waste material is discharged in liquid form, and by organic macromolecule group
Point hydrolysis forms soluble small organic molecule, meanwhile, it can also be in partial removal agriculture and forestry organic waste material in hydro-thermal carbonization process
Ash content, further promoted agriculture and forestry organic waste material utility value.
The patent of Publication No. CN106010601A disclose it is a kind of using banana skin preparation charcoal, preparation method and
It is applied, and hydro-thermal carbonization reaction is carried out after mixing by the aqueous solution after crushing banana skin with activator, is washed after reaction
It washs, be dried to obtain charcoal；Charcoal made from this method has particle small.The characteristics of large specific surface area, can be used as adsorbing
Agent, but its calorific value is low, alkali metal content is high, is not suitable for use in fuel.The patent of Publication No. CN105602646A discloses one
The method that kind hydro-thermal carbonizes biomass charcoal for roasting processed produces a kind of cleaning using the technique of compression forming after the charing of first hydro-thermal
The pure biomass charcoal for roasting of few ash；But this method primarily focus on improve carbonizing production calorific value, and not to alkali metal content into
Row control, causes alkali metal content in carbonizing production higher, meanwhile, in hydro-thermal carbonization process, the heat of generation and other pairs
Product is not used sufficiently, and certain wasting of resources is caused.
Meanwhile in hydrothermal reaction process, because of the diversification of raw material and preparation process and method, hydro-thermal charcoal obtained
The difference of the performance parameters such as ash content, volatile matter, calorific value and alkali metal content is very big, so that product has different performance and use
On the way, diversified hydro-thermal product char is formd, and currently still lacks height a kind of while that there is high heating value and low alkali metal content
Quality hydro-thermal charcoal, it is necessary to which preparation method is studied.
Summary of the invention
It is an object of the invention in view of the above-mentioned problems, providing a kind of agriculture and forestry organic waste material dealkalize charing based on hydro-thermal reaction
Method, by controlling the raw material and reaction condition of hydro-thermal reaction, by the agriculture of utility value lower low heat value, high basic metal content
Woods waste is converted into the high-quality hydro-thermal charcoal of high heating value, low alkali metal content；And by the waste heat and by-product in reaction
It is recycled, energy consumption can be reduced and improves resource utilization, reduced environmental pollution；Disposed of in its entirety process efficiency height, energy
Consume it is low, with positive economic significance and ecological significance.
To achieve the above object, the technical solution adopted by the present invention is that:
A kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction, includes the following steps:
(1) agriculture and forestry organic waste material pre-processes: carrying out break process to agriculture and forestry organic waste material, and adds system in broken sample
Slurry water, prepares slurries；
(2) slurries the pre-heat treatment: by agriculture and forestry organic waste material slurries obtained through high mudjack pressurization after, be delivered to heat exchanger into
Row preheating；
(3) hydro-thermal dealkalize carbonizes: the slurries after pressurization, preheating being delivered to high temperature and pressure hydro-thermal carbonization reaction kettle, anti-
It answers and completes dealkalize, carbonization reaction in kettle；
(4) solid-liquid separation treatment: high temperature, the high-pressure material after dealkalize, charing process are separated by solid-liquid separation, high temperature is obtained
Hydro-thermal charcoal and high temperature dealkalize water；
(5) dehydration and drying is handled: the high temperature hydro-thermal charcoal being delivered to hydro-thermal charcoal drying system, is taken using high temperature hydro-thermal charcoal
The thermal energy of band be dried from dehydration, obtains the hydro-thermal charcoal of low alkali metal content；
(6) heat recovery: the high temperature dealkalize water is delivered in condenser system cooled down, decompression processing, and
High-temperature steam after decompression is delivered to heat exchanger, agriculture and forestry organic waste material slurries are preheated；
(7) dealkalize water circulation use: water-oil separating is carried out to the dealkalize water after cooling, decompression, is obtained recyclable
Biomass coke tar and brackish water.
Further, the granularity after agriculture and forestry organic waste material break process described in step (1) is less than 1cm, broken agricultural
Waste carries out slurries preparation through pipeline to pulping tank in the pulping tank.
Further, slurrying water described in step (1) includes industry water, desalination recirculated water, in the acid waste liquid of chemical plant
One or more mixing, the pH value control of the slurrying water 2~6, slurrying rear slurry moisture control 60%~
80%.
Further, in 20~40min, slurries preheating temperature is 120 for the preheating time control of preheating described in step (2)
~180 DEG C.
Further, the operating temperature in hydro-thermal carbonization reaction kettle described in step (3) is controlled at 180~340 DEG C, corresponding
Saturated vapor pressure is 1~14.6MPa, and the control of processing time is in 20~100min.
Further, in the hydro-thermal charcoal of low alkali metal content made from step (5), the gross mass percentage of metallic potassium and sodium
Less than 0.3%, alkali metal removal efficiency is greater than 90%.
Further, the moisture of the hydro-thermal charcoal of low alkali metal content made from step (5) is less than 10%, dry base volatile matter
Less than 66%, ash content is less than 5%, and Hardgrove grind ability index is greater than 70, and higher calorific value is greater than 20000kJ/kg.
Further, the device that decompression processing described in step (6) uses is depressurized by flash tank and is generated for flash tank
180~240 DEG C of high-temperature steam is delivered to heat exchanger, heats to slurries.
Further, agriculture and forestry organic waste material described in step (1) include wheat, it is rice, corn, potato, oil plant, cotton, sweet
The residue and non-forming tree material, branch, tree root, pericarp, fruit stone and other woodss of sugarcane and other crops after harvesting seed
Industry waste.
Further, biomass coke tar described in step (7) is used for chemical plant as raw material；The brackish water is by steaming
Hair, crystallization, obtain thick sylvite and use for chemical fertilizer factory as raw material, remaining desalted water is as slurrying water circulation use.
The beneficial effects of the present invention are:
1, the present invention is by the raw material and reaction condition of control hydro-thermal reaction, by the lower low heat value of utility value, high-alkali
The agriculture and forestry organic waste material of tenor is converted into the high-quality hydro-thermal charcoal of high heating value, low alkali metal content；And by reaction
Waste heat and by-product are recycled, and can be reduced energy consumption and be improved resource utilization, reduce environmental pollution；
2, of the invention using agriculture and forestry organic waste material as primary raw material, and with industry water, desalination recirculated water, chemical plant acid waste liquid
For equal aqueous solutions as slurrying water, raw material sources are abundant, low in cost, and waste can be made to be fully used；The present invention is logical
Crossing makes agriculture and forestry organic waste material, with being evenly heated, coming into full contact in water, carry out hydro-thermal dealkalize carbonization reaction in slurrying, it is uniform that performance is made
Stable hydro-thermal charcoal, and the quality of hydro-thermal charcoal can be by optimizing the pH value of slurrying water, slurries moisture content, hydro-thermal carbonization time
Regulated and controled with temperature, satisfies the use demand hydro-thermal charcoal performance obtained；
3, the moisture in agriculture and forestry organic waste material is discharged in liquid form using hydro-thermal charing principle by the present invention, reduces pyrolysis
The evaporation gasification consumption of calorie of vapor, whole energy consumption are low in drying process；Meanwhile the present invention is completed in hydro-thermal carbonization reaction
It is first separated by solid-liquid separation and is dried afterwards, then carry out decrease temperature and pressure, carry out high temperature solid-state hydro-thermal charcoal certainly using the physical thermal carried
Dehydration and drying processing, and the high-temperature steam for generating high-temperature liquid-phase decompression is used for the preheating of agriculture and forestry organic waste material slurries, heat utilization
It is high-efficient；
4, the hydro-thermal charcoal that agriculture and forestry organic waste material obtains after hydro-thermal dealkalize carbonizes upgrading is had high heating value, low alkali gold by the present invention
Belong to content, can be used as a kind of good clean fuel use, to promote agriculture and forestry organic waste material utility value；And in reaction process
Obtained dealkalize water can recycle again after separation, and comprehensive resource utilization rate is high, disposed of in its entirety process efficiency height, energy consumption
It is low, with positive economic significance and ecological significance.
Detailed description of the invention
Fig. 1 is a kind of flow chart of the agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction of the present invention.
Specific embodiment
Below in conjunction with drawings and examples, the present invention will be described in further detail, so that advantages of the present invention and spy
Sign can be easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
Obviously, described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Based on of the invention
Embodiment, those of ordinary skill in the art's obtained all other embodiment without making creative work,
Belong to the range that the present invention is protected.
Embodiment 1
A kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction is present embodiments provided, is with corn stover
Example, dealkalize carbonize process as shown in Figure 1, including the following steps:
(1) agriculture and forestry organic waste material pre-processes: carrying out break process to corn stover, so that broken granularity is less than 1cm, will break
Corn stover after broken is added into broken corn stover by industry through pipeline to pulping tank, and in pulping tank
The aqueous solution that the pH value that water, desalted water and chemical plant acid waste liquid mix is 6 is made after stirring and evenly mixing as slurrying water
Slurries, and controlling slurries moisture content is 80%；
(2) slurries the pre-heat treatment: by agriculture and forestry organic waste material slurries obtained after the pressurization of high mudjack, extremely by pipeline
Heat exchanger is preheated, and in 40min, preheating temperature is 120 DEG C for preheating time control；
(3) hydro-thermal dealkalize carbonizes: the slurries after pressurization, preheating are passed through pipeline to the hot carbonization reaction of high-temperature high pressure water
Kettle, control reaction kettle operating temperature are 180 DEG C, and corresponding saturated vapor pressure is 1MPa, and the control of processing time is completed de- in 100min
Alkali, carbonization reaction；
(4) solid-liquid separation treatment: by after dealkalize, charing process high temperature, high-pressure material is into being transported to solid-liquid separation system
It is separated by solid-liquid separation, obtains mud cake shape high temperature hydro-thermal charcoal and high temperature dealkalize water；
(5) dehydration and drying is handled: the high temperature hydro-thermal charcoal being delivered to hydro-thermal charcoal drying system, is taken using high temperature hydro-thermal charcoal
The physical thermal of band be dried from dehydration, obtains the hydro-thermal charcoal of low alkali metal content, uses for steel plant as fuel；
(6) heat recovery: the high temperature dealkalize water is delivered in condenser system cooled down, decompression processing, warp
180 DEG C of high-temperature steams that flash tank decompression generates, to heat exchanger, preheat agriculture and forestry organic waste material slurries by pipeline；
(7) dealkalize water circulation use: water-oil separating is carried out to the dealkalize water after cooling, decompression, is obtained recyclable
Biomass coke tar and brackish water, the biomass coke tar are used for chemical plant as raw material, and the brackish water is through pervaporation, knot
Crystalline substance obtains thick sylvite and uses for chemical fertilizer factory as raw material, and remaining desalted water is as slurrying water circulation use.
The hydro-thermal charcoal of low alkali metal content made from step (5) is tested, the gross mass of its metallic potassium and sodium is measured
Percentage is 0.28%, and alkali metal removal efficiency is 91.6%, and moisture is 9.8%, and dry base volatilization is divided into 63.5%, and ash content is
4.1%, Hardgrove grind ability index 73, higher calorific value 21700kJ/kg, hydro-thermal charcoal made from the present embodiment of surface has height
Calorific value and low alkali metal content, and overall performance is excellent, can satisfy the demand of practical application.
Embodiment 2~5
Embodiment 2~5 provides a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction, with 1 phase of embodiment
Than the difference is that change the pH value and slurries moisture content of slurrying water in step (1), the corresponding slurrying of each embodiment is used
The pH value of water and the occurrence of slurries moisture content are as shown in table 1:
The pH value and slurries moisture content of the corresponding slurrying water of 1 embodiment of table 2~5
| Embodiment | The pH value of slurrying water | Slurries moisture content (%) |
| Embodiment 2 | 4 | 80 |
| Embodiment 3 | 2 | 80 |
| Embodiment 4 | 2 | 70 |
| Embodiment 5 | 2 | 60 |
Hydro-thermal charcoal obtained in each embodiment is tested, the results are shown in Table 2:
The performance of hydro-thermal charcoal made from step (5) in 2 embodiment 2~5 of table
As can be seen from Table 2, embodiment 2~5 prepare hydro-thermal charcoal alkali metal content between 0.11%~0.21%,
The removal efficiency of alkali metal is not less than 93.7%, moisture between 9.1%~9.5%, dry base volatile matter 64.1%~
Between 65.6%, content of ashes is not higher than 4.2%, and Hardgrove grind ability index is not less than 72, and dry base higher calorific value is not less than
The performance of 21330kJ/kg, hydro-thermal charcoal are improved.Wherein, difference comparative example 1~3 and embodiment 3~5, it can be seen that
Alkali metal removal efficiency increases with the reduction of slurrying pH value of water solution and the increase of slurries moisture content, this is because in biomass
Alkali metal exists in the form of organic and is two kinds inorganic, and alkali metal inorganic salts are soluble easily in water, and liquid is quickly dissolved into water-heat process
It is removed in phase, the reduction of pH value of water solution increases the polarity of solution, makes cellulose, hemicellulose and wood in biomass
Quality structure more destructible in water-heat process, accelerates with the removing of alkali metal existing for organic form.Therefore, biomass water
In hot carbonization process, the removing of alkali metal is reinforced with the reduction of solution ph and the increase of slurries moisture content.
Embodiment 6~13
Embodiment 6~13 provides a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction, with 3 phase of embodiment
Than the difference is that when changing the operating temperature in step (3) in hydro-thermal carbonization reaction kettle, saturated vapor pressure and processing
Between, the operating temperature, saturated vapor pressure in the corresponding hydro-thermal carbonization reaction kettle of each embodiment and the occurrence such as table 3 for handling the time
It is shown:
Operating temperature, saturated vapor pressure and processing time in the corresponding hydro-thermal carbonization reaction kettle of 3 embodiment of table 6~13
Hydro-thermal charcoal obtained in each embodiment is tested, the results are shown in Table 4:
The performance of hydro-thermal charcoal made from step (5) in 4 embodiment 6~13 of table
As can be seen from Table 4, embodiment 6~13 prepare hydro-thermal charcoal alkali metal content between 0.05%~0.17%,
The removal efficiency of alkali metal is not less than 94.9%, moisture between 5.6%~9.1%, dry base volatile matter 28.5%~
Between 52.7%, content of ashes is not higher than 3.5%, and Hardgrove grind ability index is not less than 73, and dry base higher calorific value is not less than
The performance of 23180kJ/kg, hydro-thermal charcoal are improved.
Wherein, comparative example 3 and embodiment 6~9 can be seen that in a certain range, with hydro-thermal carbonization reaction kettle
Raised trend is integrally presented in the alkali metal removal efficiency of the increase of middle operating temperature, hydro-thermal charcoal obtained；Meanwhile comparative example
9~13 as can be seen that in a certain range, with the increase of hydro-thermal charing process time, the alkali metal of hydro-thermal charcoal obtained is de-
Except raised trend is integrally presented in rate；This is because temperature is higher in hydro-thermal carbonization process, the processing time is longer, agricultural are discarded
The decomposition charing of the substances such as cellulose, hemicellulose, lignin in object is then more thorough, so that a large amount of organo-functional groups occur to break
It splitting and decomposes, the alkali metal of organic form, which is released, to be removed, while discharging more micro-molecular gas during biology charing,
Porosity is improved, good channel is provided for the evolution of alkali metal, to promote the removing of alkali metal；But when operating temperature reaches
When reaching 80min to 260 DEG C, processing time, continues to increase temperature or extends the time to the no positive effect of the removing of alkali metal,
It will affect the removing of alkali metal instead, and increase energy consumption.
The above, only of the invention illustrates embodiment, not to the present invention in any form with substantial limitation,
It should be pointed out that for those skilled in the art, under the premise of not departing from the method for the present invention, that makes several changes
It also should be regarded as protection scope of the present invention into supplement；Meanwhile all substantial technologicals according to the present invention do above-described embodiment
Any equivalent variations change, modification and differentiation, still fall within protection scope of the present invention.
Claims (10)
1. a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction, which comprises the steps of:
(1) agriculture and forestry organic waste material pre-processes: carrying out break process to agriculture and forestry organic waste material, and adds slurrying in broken sample and use
Water prepares slurries；
(2) it slurries the pre-heat treatment: by agriculture and forestry organic waste material slurries obtained after the pressurization of high mudjack, is delivered to heat exchanger and carries out in advance
Heat；
(3) hydro-thermal dealkalize carbonizes: the slurries after pressurization, preheating being delivered to high temperature and pressure hydro-thermal carbonization reaction kettle, in reaction kettle
Interior completion dealkalize, carbonization reaction；
(4) solid-liquid separation treatment: high temperature, the high-pressure material after dealkalize, charing process are separated by solid-liquid separation, high temperature hydro-thermal is obtained
Charcoal and high temperature dealkalize water；
(5) dehydration and drying is handled: the high temperature hydro-thermal charcoal being delivered to hydro-thermal charcoal drying system, is carried using high temperature hydro-thermal charcoal
Thermal energy be dried from dehydration, obtains the hydro-thermal charcoal of low alkali metal content；
(6) heat recovery: the high temperature dealkalize water is delivered in condenser system cooled down, decompression processing, and will drop
High-temperature steam after pressure is delivered to heat exchanger, preheats to agriculture and forestry organic waste material slurries；
(7) dealkalize water circulation use: water-oil separating is carried out to the dealkalize water after cooling, decompression, obtains recyclable biology
Matter tar and brackish water.
2. a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction according to claim 1, it is characterised in that:
Granularity after agriculture and forestry organic waste material break process described in step (1) is less than 1cm, broken agriculture and forestry organic waste material through pipeline extremely
Pulping tank, and slurries preparation is carried out in the pulping tank.
3. a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction according to claim 1, it is characterised in that:
Slurrying water described in step (1) includes one of industry water, desalination recirculated water, chemical plant acid waste liquid or a variety of mixing,
The pH value of the slurrying water is controlled 2~6, and slurrying rear slurry moisture control is 60%~80%.
4. a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction according to claim 1, it is characterised in that:
In 20~40min, slurries preheating temperature is 120~180 DEG C for the preheating time control of preheating described in step (2).
5. a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction according to claim 1, it is characterised in that:
Operating temperature in hydro-thermal carbonization reaction kettle described in step (3) is controlled at 180~340 DEG C, and corresponding saturated vapor pressure is 1~
14.6MPa, the control of processing time is in 20~100min.
6. a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction according to claim 1, it is characterised in that:
In the hydro-thermal charcoal of low alkali metal content made from step (5), the gross mass percentage of metallic potassium and sodium is less than 0.3%, alkali metal
Removal efficiency is greater than 90%.
7. a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction according to claim 6, it is characterised in that:
The moisture of the hydro-thermal charcoal of the low alkali metal content is less than 10%, and dry base volatile matter is less than 66%, and ash content is less than 5%, Kazakhstan
Grindability index is greater than 70, and higher calorific value is greater than 20000kJ/kg.
8. a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction according to claim 1, it is characterised in that:
The device that decompression processing described in step (6) uses steams for flash tank by the high temperature that flash tank decompression generates 180~240 DEG C
Vapour is delivered to heat exchanger, heats to slurries.
9. a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction according to claim 1, it is characterised in that:
Agriculture and forestry organic waste material described in step (1) includes that wheat, rice, corn, potato, oil plant, cotton, sugarcane and other crops are being received
Residue and non-forming tree material, branch, tree root, pericarp, fruit stone and other forestry wastes after obtaining seed.
10. a kind of agriculture and forestry organic waste material dealkalize charing method based on hydro-thermal reaction according to claim 1, feature exist
In: biomass coke tar described in step (7) is used for chemical plant as raw material；The brackish water obtains thick through pervaporation, crystallization
Sylvite is used for chemical fertilizer factory as raw material, and remaining desalted water is as slurrying water circulation use.
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