CN107937083A - A kind of method that biomass sludge regeneration prepares biomass fuel - Google Patents

A kind of method that biomass sludge regeneration prepares biomass fuel Download PDF

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Publication number
CN107937083A
CN107937083A CN201711165015.3A CN201711165015A CN107937083A CN 107937083 A CN107937083 A CN 107937083A CN 201711165015 A CN201711165015 A CN 201711165015A CN 107937083 A CN107937083 A CN 107937083A
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biomass
sludge
mixture
parts
fuel
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CN201711165015.3A
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Chinese (zh)
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李绘荣
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Guilin Angie Rose Agricultural Development Co Ltd
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Guilin Angie Rose Agricultural Development Co Ltd
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Priority to CN201711165015.3A priority Critical patent/CN107937083A/en
Publication of CN107937083A publication Critical patent/CN107937083A/en
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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
    • C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/004—Sludge detoxification
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • 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
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/04—Raw material of mineral origin to be used; Pretreatment thereof
    • 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
    • C10L5/02—Solid fuels such as briquettes consisting mainly of carbonaceous materials of mineral or non-mineral origin
    • C10L5/06—Methods of shaping, e.g. pelletizing or briquetting
    • C10L5/10—Methods of shaping, e.g. pelletizing or briquetting with the aid of binders, e.g. pretreated binders
    • 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
    • C10L5/442—Wood or forestry waste
    • 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
    • C10L5/445—Agricultural waste, e.g. corn crops, grass clippings, nut shells or oil pressing residues
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/24—Mixing, stirring of fuel components
    • 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
    • C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
    • C10L2290/32—Molding or moulds
    • 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
    • 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

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Geochemistry & Mineralogy (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Agronomy & Crop Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Ecology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)

Abstract

The present invention relates to a kind of method that biomass sludge regeneration prepares biomass fuel, comprise the following steps：Step 1, the biomass sludge not being dehydrated is spirally dehydrated；Step 2, takes biomass sludge to be mixed with clear water；Step 3, disinfection sanitizer is added into mud mixture；Step 4, modifying agent, sulphur-fixing agent are launched into the mud mixture after standing, after homogeneous reaction, add powdered biomass and coal powder, are mixed；Step 5, by the mixture in step 4 through high-temperature sterilization and drying so that mixing water content of matter is 10% 15%；Step 6, combustion-promoting adhesive is added in by dry mixture, is sufficiently mixed post-processing shaping.Present invention process is simple, the problem of realizing the minimizing, innoxious of specific resistance to filtration, efficiently solving sludge secondary pollution, and obtains biomass environment-friendly fuel.

Description

A kind of method that biomass sludge regeneration prepares biomass fuel
Technical field
The present invention relates to biomass fuel technical field, more particularly to a kind of biomass sludge regeneration to prepare biomass fuel Method.
Background technology
Biomass sludge is rivers, lake, containing cellulose, the floating discarded object of hemicellulose and lignin, and industry, Discarded object with cellulose, hemicellulose and lignin in agricultural production, the bamboo and wood discarded in construction, environment gardens, woods The discarded object of industry pruning felling, the various agricultural wastes produced in the various wood wastes produced in life, agricultural production Stalk etc., these biomass fuels usually without garbage disposal, are often discarded in soot or field, pollute environment.
Although biomass sludge contains large amount of organic, certain heat can be produced in burning, these sludge Calorific value it is relatively low, usually can not reach the degree used as fuel between 1000 kilocalories in 500 kilocalories.It is in addition, biological Contain the components, i.e. ash content such as a large amount of aphlogistic dirts in matter sludge.The increase of content of ashes, make unit mass can The content of combustion things matter is opposite to be much less, and the calorific value reduction of corresponding fuel is more, and reduces ignition temperature, hinders combustion process In radiant heat transfer, reduce burning velocity, wrap up coke granule, hinder oxygen to coke diffusion inside, increase machinery not exclusively Combustion heat loss；And the condensation of thermophoresis, inertial collision and flue, afterbody heat-transfer surface in combustion, chemically reacted Cheng Zhong, increases dust stratification, abrasion and the corrosion of heating surface and heat-transfer surface, makes smoke evacuation flying dust heat content increase etc..Therefore, generally regarding ash content For the slag in biomass fuel, increase operating cost.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of method that biomass sludge regeneration prepares biomass fuel, Energy regeneration biomass sludge, reduces the pollution of environment, realizes the regeneration of the energy.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of biomass sludge regeneration prepares biomass fuel Method, comprise the following steps：
Step 1, the biomass sludge not being dehydrated is spirally dehydrated so that dewatered biomass sludge contains Water rate is less than 15%；
Step 2, the dewatered biomass sludge for taking parts by weight to be 100-150 parts are mixed with clear water so that sludge The moisture content of mixture is 70%-90%；
Step 3, disinfection sanitizer is added into mud mixture, when placement 4-5 is small after stirring evenly；
Step 4, modifying agent, sulphur-fixing agent are launched into the mud mixture after standing, after homogeneous reaction, add weight Part be 30-50 parts of powdered biomass through crushing and coal powder that parts by weight are 10-15 parts, mix, obtain biomass sludge, The mixture of powdered biomass, coal powder；
Step 5, by the mixture in step 4 through 200-350 DEG C of high-temperature sterilization and drying so that mixture is aqueous Rate is 10%-15%；
Step 6, combustion-promoting adhesive is added in by dry mixture, is sufficiently mixed post-processing shaping, is obtained biology Matter fuel.
Based on the above technical solutions, the present invention can also be improved as follows.
Further, in the step 3, the disinfection sanitizer is the mixed solution of plant extraction liquid stoste and hydrogen peroxide, Addition is plant extraction liquid stoste 0.01-0.03L/kg.DS, hydrogen peroxide 0.02-0.05L/kg.DS.
Further, in the step 4, the modifying agent is Al2O3With the mixture of molysite, addition 0.05- 0.1kg/kg.DS。
Further, in the step 4, the sulphur-fixing agent is quick lime, addition 0.05-0.2kg/kg.
Further, in the step 4, the powdered biomass is stalk, sawdust, bagasse, the one or more of rice chaff Mixing is made through crushing.
The beneficial effects of the invention are as follows：Using bactericidal agent of different nature and deodorant to former material in preparation process of the present invention Material carries out deodorization, sterilizing, and the propagation of pest and disease damage, bacterium, foul smell is prevented in the transportational process of the biological burning fuel of preparation；Technique Simply, the problem of realizing the minimizing, innoxious of specific resistance to filtration, efficiently solving sludge secondary pollution, and obtain biology Matter environment-friendly fuel.Deodorization is carried out to biomass sludge by plant extraction liquid stoste, the peculiar smell of biomass sludge can be reduced；Pass through Hydrogen peroxide carries out sterilizing, removes the germ of biomass sludge, avoids in biomass fuel prepared by subsequent combustion to ring Cause the propagation of pest and disease damage, bacterium, foul smell in border.
Embodiment
The principles and features of the present invention are described below, and the given examples are served only to explain the present invention, is not intended to limit Determine the scope of the present invention.
Embodiment one
The method that the present embodiment biomass sludge regeneration prepares biomass fuel comprises the following steps：
Step 1, the biomass sludge not being dehydrated is spirally dehydrated so that dewatered biomass sludge contains Water rate is less than 15%；
Step 2, the dewatered biomass sludge for taking parts by weight to be 100 parts are mixed with clear water so that sludge mixes The moisture content of thing is 70%；
Step 3, disinfection sanitizer is added into mud mixture, when placement 4 is small after stirring evenly, the sterilizing Agent is the mixed solution of plant extraction liquid stoste and hydrogen peroxide, and addition is plant extraction liquid stoste 0.01L/kg.DS, hydrogen peroxide 0.02L/kg.DS；
Step 4, modifying agent, sulphur-fixing agent is launched into the mud mixture after standing, the modifying agent is Al2O3And iron The mixture of salt, addition 0.05kg/kg.DS, the sulphur-fixing agent are quick lime, addition 0.05kg/kg, homogeneous reaction Afterwards, the powdered biomass through crushing that parts by weight are 30 parts and the coal powder that parts by weight are 10 parts are added, mixing, obtains biological Matter sludge, powdered biomass, the mixture of coal powder, the powdered biomass is stalk, sawdust, bagasse, one kind of rice chaff Or a variety of mixing are made through crushing；
Step 5, by high-temperature sterilization of the mixture in step 4 through 200 DEG C and drying so that mixing water content of matter is 10%；
Step 6, combustion-promoting adhesive is added in by dry mixture, is sufficiently mixed post-processing shaping, is obtained biology Matter fuel.
Embodiment two
The method that the present embodiment biomass sludge regeneration prepares biomass fuel comprises the following steps：
Step 1, the biomass sludge not being dehydrated is spirally dehydrated so that dewatered biomass sludge contains Water rate is less than 15%；
Step 2, the dewatered biomass sludge for taking parts by weight to be 150 parts are mixed with clear water so that sludge mixes The moisture content of thing is 90%；
Step 3, disinfection sanitizer is added into mud mixture, when placement 5 is small after stirring evenly, the sterilizing Agent is the mixed solution of plant extraction liquid stoste and hydrogen peroxide, and addition is plant extraction liquid stoste 0.03L/kg.DS, hydrogen peroxide 0.05L/kg.DS；
Step 4, modifying agent, sulphur-fixing agent is launched into the mud mixture after standing, the modifying agent is Al2O3And iron The mixture of salt, addition 0.1kg/kg.DS, the sulphur-fixing agent are quick lime, addition 0.2kg/kg, homogeneous reaction Afterwards, the powdered biomass through crushing that parts by weight are 50 parts and the coal powder that parts by weight are 15 parts are added, mixing, obtains biological Matter sludge, powdered biomass, the mixture of coal powder, the powdered biomass is stalk, sawdust, bagasse, one kind of rice chaff Or a variety of mixing are made through crushing；
Step 5, by high-temperature sterilization of the mixture in step 4 through 350 DEG C and drying so that mixing water content of matter is 15%；
Step 6, combustion-promoting adhesive is added in by dry mixture, is sufficiently mixed post-processing shaping, is obtained biology Matter fuel.
Embodiment three
The method that the present embodiment biomass sludge regeneration prepares biomass fuel comprises the following steps：
Step 1, the biomass sludge not being dehydrated is spirally dehydrated so that dewatered biomass sludge contains Water rate is less than 15%；
Step 2, the dewatered biomass sludge for taking parts by weight to be 120 parts are mixed with clear water so that sludge mixes The moisture content of thing is 80%；
Step 3, disinfection sanitizer is added into mud mixture, and when placement 4-5 is small after stirring evenly, the sterilization disappears Toxic agent is the mixed solution of plant extraction liquid stoste and hydrogen peroxide, and addition is plant extraction liquid stoste 0.02L/kg.DS, dioxygen Water 0.03L/kg.DS；
Step 4, modifying agent, sulphur-fixing agent is launched into the mud mixture after standing, the modifying agent is Al2O3And iron The mixture of salt, addition 0.08kg/kg.DS, the sulphur-fixing agent are quick lime, addition 0.15kg/kg, homogeneous reaction Afterwards, the powdered biomass through crushing that parts by weight are 40 parts and the coal powder that parts by weight are 12 parts are added, mixing, obtains biological Matter sludge, powdered biomass, the mixture of coal powder, the powdered biomass is stalk, sawdust, bagasse, one kind of rice chaff Or a variety of mixing are made through crushing；
Step 5, by high-temperature sterilization of the mixture in step 4 through 300 DEG C and drying so that mixing water content of matter is 12%；
Step 6, combustion-promoting adhesive is added in by dry mixture, is sufficiently mixed post-processing shaping, is obtained biology Matter fuel.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and Within principle, any modification, equivalent replacement, improvement and so on, should all be included in the protection scope of the present invention.

Claims (5)

1. a kind of method that biomass sludge regeneration prepares biomass fuel, it is characterised in that comprise the following steps：
Step 1, the biomass sludge not being dehydrated is spirally dehydrated so that the moisture content of dewatered biomass sludge Less than 15%；
Step 2, the dewatered biomass sludge for taking parts by weight to be 100-150 parts are mixed with clear water so that sludge mixes The moisture content of thing is 70%-90%；
Step 3, disinfection sanitizer is added into mud mixture, when placement 4-5 is small after stirring evenly；
Step 4, modifying agent, sulphur-fixing agent are launched into the mud mixture after standing, and after homogeneous reaction, adding parts by weight is 30-50 parts of powdered biomass through crushing and parts by weight are 10-15 part of coal powder, mix, obtain biomass sludge, biology The mixture of matter powder, coal powder；
Step 5, by the mixture in step 4 through 200-350 DEG C of high-temperature sterilization and drying so that mixing water content of matter is 10%-15%；
Step 6, combustion-promoting adhesive is added in by dry mixture, is sufficiently mixed post-processing shaping, is obtained biomass fuel Material.
2. the method that a kind of biomass sludge regeneration according to claim 1 prepares biomass fuel, it is characterised in that institute State in step 3, the disinfection sanitizer is plant extraction liquid stoste and the mixed solution of hydrogen peroxide, and addition is plant extract Liquid stoste 0.01-0.03L/kg.DS, hydrogen peroxide 0.02-0.05L/kg.DS.
3. the method that a kind of biomass sludge regeneration according to claim 1 or 2 prepares biomass fuel, its feature exist In in the step 4, the modifying agent is Al2O3With the mixture of molysite, addition 0.05-0.1kg/kg.DS.
4. the method that a kind of biomass sludge regeneration according to claim 1 or 2 prepares biomass fuel, its feature exist In in the step 4, the sulphur-fixing agent is quick lime, addition 0.05-0.2kg/kg.
5. the method that a kind of biomass sludge regeneration according to claim 1 or 2 prepares biomass fuel, its feature exist In in the step 4, the powdered biomass is stalk, one or more mixing of sawdust, bagasse, rice chaff are made through crushing .
CN201711165015.3A 2017-11-21 2017-11-21 A kind of method that biomass sludge regeneration prepares biomass fuel Withdrawn CN107937083A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109097148A (en) * 2018-09-30 2018-12-28 安乡龙威新能源科技开发有限责任公司 A method of fuel is fabricated to using municipal sludge

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102358861A (en) * 2011-09-21 2012-02-22 王东 Preparation method of biomass sludge regenerated fuel charcoal
CN102491608A (en) * 2011-11-29 2012-06-13 曾秀仪 Production method of sludge biomass environment-friendly fuel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102358861A (en) * 2011-09-21 2012-02-22 王东 Preparation method of biomass sludge regenerated fuel charcoal
CN102491608A (en) * 2011-11-29 2012-06-13 曾秀仪 Production method of sludge biomass environment-friendly fuel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109097148A (en) * 2018-09-30 2018-12-28 安乡龙威新能源科技开发有限责任公司 A method of fuel is fabricated to using municipal sludge

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Application publication date: 20180420