GB2473439A - A process for making an agronomic nutrient product - Google Patents
A process for making an agronomic nutrient product Download PDFInfo
- Publication number
- GB2473439A GB2473439A GB0915747A GB0915747A GB2473439A GB 2473439 A GB2473439 A GB 2473439A GB 0915747 A GB0915747 A GB 0915747A GB 0915747 A GB0915747 A GB 0915747A GB 2473439 A GB2473439 A GB 2473439A
- Authority
- GB
- United Kingdom
- Prior art keywords
- timber
- wood
- nutrient product
- agronomic
- dusts
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000008569 process Effects 0.000 title claims abstract description 30
- 230000009418 agronomic effect Effects 0.000 title claims abstract description 29
- 235000015097 nutrients Nutrition 0.000 title claims abstract description 28
- 239000002023 wood Substances 0.000 claims abstract description 33
- 239000002243 precursor Substances 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 239000000446 fuel Substances 0.000 claims abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims abstract description 7
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 5
- 239000004571 lime Substances 0.000 claims abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 3
- 229910052586 apatite Inorganic materials 0.000 claims abstract description 3
- 239000004568 cement Substances 0.000 claims abstract description 3
- 239000003546 flue gas Substances 0.000 claims abstract description 3
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 claims abstract description 3
- 239000010801 sewage sludge Substances 0.000 claims abstract description 3
- 239000000843 powder Substances 0.000 claims description 20
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 9
- 239000011575 calcium Substances 0.000 claims description 9
- 229910052791 calcium Inorganic materials 0.000 claims description 9
- 239000011777 magnesium Substances 0.000 claims description 9
- 229910052749 magnesium Inorganic materials 0.000 claims description 9
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 8
- 239000011591 potassium Substances 0.000 claims description 8
- 229910052700 potassium Inorganic materials 0.000 claims description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 5
- 235000012255 calcium oxide Nutrition 0.000 claims description 5
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims description 5
- 239000000395 magnesium oxide Substances 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 229910019142 PO4 Inorganic materials 0.000 claims description 4
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- 239000010452 phosphate Substances 0.000 claims description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 4
- 229940072033 potash Drugs 0.000 claims description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 4
- 235000015320 potassium carbonate Nutrition 0.000 claims description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000002374 bone meal Substances 0.000 claims description 2
- 229940036811 bone meal Drugs 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims 2
- 229910052717 sulfur Inorganic materials 0.000 claims 2
- 239000010459 dolomite Substances 0.000 claims 1
- 229910000514 dolomite Inorganic materials 0.000 claims 1
- 210000000988 bone and bone Anatomy 0.000 abstract 1
- 239000000047 product Substances 0.000 description 18
- 239000002956 ash Substances 0.000 description 16
- 239000002425 soil liming agent Substances 0.000 description 10
- 239000002803 fossil fuel Substances 0.000 description 8
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- 239000005864 Sulphur Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 6
- 239000010881 fly ash Substances 0.000 description 6
- 239000010882 bottom ash Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 238000007792 addition Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000004615 ingredient Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 229910021653 sulphate ion Inorganic materials 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003337 fertilizer Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000010979 pH adjustment Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000375 suspending agent Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 235000013619 trace mineral Nutrition 0.000 description 2
- 239000011573 trace mineral Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000010803 wood ash Substances 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- OKTJSMMVPCPJKN-YPZZEJLDSA-N carbon-10 atom Chemical compound [10C] OKTJSMMVPCPJKN-YPZZEJLDSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 150000005829 chemical entities Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000002939 deleterious effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005367 electrostatic precipitation Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000009313 farming Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000003898 horticulture Methods 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
- 235000012245 magnesium oxide Nutrition 0.000 description 1
- 239000012702 metal oxide precursor Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 238000009419 refurbishment Methods 0.000 description 1
- 239000011122 softwood Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000009307 subsistence farming Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000314 transition metal oxide Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D3/00—Calcareous fertilisers
- C05D3/02—Calcareous fertilisers from limestone, calcium carbonate, calcium hydrate, slaked lime, calcium oxide, waste calcium products
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D5/00—Fertilisers containing magnesium
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D9/00—Other inorganic fertilisers
-
- 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
-
- 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
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
-
- 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
-
- 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
- Y02P20/141—Feedstock
- Y02P20/145—Feedstock the feedstock being materials of biological origin
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Fertilizers (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
A process for making an agronomic nutrient product is disclosed which comprises combining a wood-based fuel with one or more oxide precursors; and combusting the mixture obtained. The oxide precursor may be lime kiln fines, calcined sewage sludge, bone heal, apatite ore, cement kiln dusts, felspatic quarry dusts or flue gas desulphurisation dusts. Also disclosed is a method of modifying the timber feed for a wood burning power station which comprises coating timber chips with an aqueous composition of an oxide precursor.
Description
Improved Agronomic Nutrient Powder The present invention relates to a process by which agronomic nutrients can be manufactured without the use of significant additional quantities of fossil fuel. The process described herein is based on the combustion of timber to provide energy for the generation of electrical power.
To appreciate the process improvement potential of the present invention it is first necessary to understand some of the disadvantages of conventional wood burning powerstations.
Wood burning powerstations generate an ash as a by-product of the combustion of timber.
These conventional wood burning powerstations are claimed to be environmentally friendly because the forests consumed are replaced with sapling trees. Thus the trees absorb carbon dioxide during their life and this carbon dioxide, and little additional, is liberated when the timber is consumed in the powerstation furnace.
However, this environmentally sound image is somewhat tarnished when it is considered that the ash from a conventional wood burning powerstation has no commercial value and has to be land-filled, at considerable cost and further fossil fuel consumption.
It is an aim of the present invention to convert this ash into an advantageous agronomic nutrient powder.
To appreciate the advantageous product properties of the present invention it is first necessary to understand some of the disadvantages of conventional agricultural liming agents.
Most cultivated agricultural land becomes more acidic with use and therefore needs to be limed. Conventional liming is carried out using quarried chalk or limestone which has to be crushed into a fine powder. This extractive and comminution process is expensive and consumes significant quantities of fossil fuel.
It is a further current disadvantage of conventional agricultural liming practice that the lime has to be added separately from any fertiliser addition. As such liming constitutes an additional labour and fossil fuel intensive application to agricultural land.
There are many farming practices in which only small quantities of fertiliser nutrients are needed. According to the present invention these can be conveniently provided by the nutrified liming agent produced by the present invention.
According to a first aspect of the present invention there is provided a process for making an agronomic nutrient product, the process comprising: (a) combining a wood-based fuel with one or more oxide precursors; and (b) com busting the mixture obtained in step (a).
According to a second aspect of the present invention there is provided an agronomic nutrient product obtained by the process of the first aspect.
Preferably step (a) involves combining a wood based fuel, for example timber chips with an aqueous composition comprising one or more oxide precursors.
Preferably step (b) involves combusting the mixture in a wood burning powerstation.
Preferably the product of the second aspect of the present invention is a powder.
The product of the second aspect of the present invention is preferably an agronomically nutrified liming powder; principally comprising finely divided oxides of calcium, magnesium, phosphorous, potassium and sulphur.
The present invention thus suitably involves the addition of oxide precursors to the in-bound timber fuel feed of wood burning powerstations. These oxide precursors are suitably pyrolysed in the powerstation furnace, to the corresponding oxides. In this way agronomically beneficial oxides may be added to the wood ash produced.
The process involved in the present invention may be described as: Co-oxidic -Calcination for Agronomic Liming Compositions (CO-CALC).
Step (a) of the method of the first aspect of the present invention suitably involves making additions to the timber chip to be used in wood burning powerstations. This addition may be in the form of a water-based slip containing oxide precursors. This additive slip may beneficially be dried onto the timber chip prior to furnacing. Advantageously powerstation waste heat may be used to dry the additive slip onto the timber chip.
The timber chip so treated may then be suitably burnt in the powerstation using conventional wood burning powerstation technology. Such technology usually incorporates an ash recovery stage that may be either an electrostatic precipitator or a bag filter or any such device known in that industry, for fine particle dust recovery from the furnace and or furnace flues.
In this way a modified furnace bottom ash and a modified furnace flue dust can be recovered in dry form from wood burning powerstations, which, according to the present invention, constitutes an improved, that is to say agronomically beneficial, liming agent, that additionally contains some or all of the following oxides: calcium, magnesium, phosphorus, potassium and sulphur.
Preferably it is a feature of the present invention that little or no additional fossil fuel is consumed, over and above conventional wood burning powerstation practice.
According to the present invention the ash produced by wood burning powerstations can be beneficiated into a valuable agronomic agent, thus obviating land-filling, with no further fossil fuel expenditure.
This operational improvement for wood burning powerstations elevates such operations above coal fired powerstations, because pulverised fuel ash (PFA) cannot be so beneficiated into such an agronomic product.
Thus, according to the current invention the improved agronomic nutrient powder produced has both environmental and economic advantages. Preferably the agronomic nutrient product produced by the present invention is alkaline. Thus the product may suitably be used to neutralize acidity in soil. This is commonly referred to as liming" and thus the product may be regarded as a liming agent.
According to the present invention a finely divided liming powder may suitably be produced which obviates extractive and comminution processes needed when using conventional chalk or limestone liming agents. Moreover, in addition to soil pH adjustment the proposed improved agronomic liming agent may suitably contain significant quantities of primary and secondary plant nutrients, including one or more of calcium, magnesium, phosphorous, potassium and sulphur.
This improved agronomic nutrient powder may be used as a substitute for fossil fuel consuming fertilisers or be used in conjunction with the same.
Taken together the benefits of the proposed product, in terms of improved liming and nutrification, confer substantial economic and environmental benefits.
Suitable raw materials for use in the process of present invention will now be described.
The preferred wood-based fuel is chipped timber. This may be based on prime forest timber such as Northern Soft Woods or it may be recovered timber from the construction, building refurbishment and demolition trades. Blends of both prime and recovered timber may be used, that is burnt in wood burning powerstations. The presence of transition metal oxide precursors in recovered timber, for example timber treatment residues or paint or other surface or impregnating treatments is not deleterious as they provide agronomically beneficial tertiary ie trace elements.
In step (a) the wood-based fuel is combined with one or more oxide precursors. Preferably it is combined with an aqueous composition comprising one or more oxide precursors. This may be referred to herein as an oxide precursor slip".
The one or more oxide precursors are preferably provided as a water based slurry, that is applied to the chipped timber prior to burning. The oxide precursor slip is of specific importance in terms of the present invention.
The oxide precursion slip is preferably a water based suspension of chemical entities which, upon calcination, yield agronomically beneficial oxides. Such oxides include those of calcium, magnesium, phosphorous, potassium, sulphur and mixtures thereof.
Appropriate ingredients for the oxide precursor slip may therefore be selected from one or more of: lime kiln fines (for calcium); dolomitic limestone kiln fines (for magnesium); calcined sewage sludge, ground bone meal, or ground apatite ore (for phosphorus); cement kiln dusts or felspatic stone quarry dusts (for potassium); and coal-burning powerstation flue gas desulphurising dusts (for sulphur).
It should also be noted that wood ash itself contains some calcium and magnesium.
The above listed precursors are only examples and many more suitable arisings, in the terms of recovered co-products, can be used.
The oxide precursor slip may further comprise slurry suspending agents and/or adhesives to bind the slip to the timber chip.
The oxide precursor slip may be prepared for use via any convenient powder into water blending system known to industry. Such a process may involve the suspension of the oxide precursor powders plus suspending agents and adhesive binders so as to produce a stable slip.
A process by which the oxide precursor slip may be applied to the timber chip will now be described: Preferably the oxide precursor slip is coated and dried onto the timber prior to burning.
This process may be achieved by any slip spraying, coating, dipping or emersion treatment as is commonly used in the timber treatment or ceramic goods industry. For example it can be applied by chip dipping and draining, or via a curtain wall cascade, or via various rotary mixers or via slip spray guns or by dry powder coating of dampened timber chip.
Once a slip coating has been achieved on the timber chip it is advantageous, but not essential, to dry the slip onto the timber prior to burning. This can be conveniently achieved using waste heat from the powerstation. For this reason, the slip coating of the timber chip may best be undertaken on the site of wood burning powerstations.
The present invention may thus further provide a method of modifying the timber feed for a wood burning powerstation, the method comprising coating timber chips with an aqueous composition comprising one or more oxide precursors. The one or more oxide precursors are suitably materials containing one or more of calcium, magnesium, phosphorous, potassium or sulphur. This method suitably provides treated timber feed and is preferably in accordance with step (a) of the process of the first aspect and may be regarded as a timber feed benefication process.
The timber feed beneficiation process, according to the present invention, is suitably complete when timber chips coated in the beneficiating slip are available to be fed into the wood burning powerstation furnace. The present invention further provides treated timber chips.
Step (b) of the present invention which preferably involves the furnacing of the beneficiated timber chips will now be described: Wood burning powerstation may employ various types of furnace, such as fluidised beds and chain grate systems. Any conventional wood chip furnace, as used in the power generation industry can be utilised according to the present invention.
The furnacing action involved at wood burning powerstations suitably involves temperatures of between 1000 and 1500°C. At these temperatures the timber chip feed is thoroughly combusted to an ash with a low residual carbon content.
The application of the oxide precursor slip, according to the present invention, preferably does not detract from the thermal efficiency of the timber furnacing operation, to any significant extent.
The effect of furnacing timber chip coated with the oxide precursor slip is suitably to pyrolyse the slip ingredients and convert them into corresponding oxides. Thus a beneficiated ash is suitably produced that contains low residual carbon content plus oxides derived from the combustion of the timber eg calcia, magnesia and silica plus derived oxides from the shp ingredients such as calcia, magnesia, phosphate, potash and sulphate.
The processes via which the combusted ashes may be recovered will now be described: The ashes produced by wood burning powerstations typically exit the furnace either as furnace bottom ashes or as fly ash, that is flue dusts.
Both of these ex furnace ash sources are of value in the present invention.
Both furnace bottom and fly ashes may be recovered, in terms of the present invention, via any convenient system as used in the power generation industry. So for example furnace bottom ash can be recovered, hot, via various vibrating and raking devices and collected in hoppers. Fly ash may be collected and recovered via electrostatic precipitation or bag filtration.
In both cases it is usual practice to recover dry ashes, and this is beneficial in the case of the present invention.
In the case of the present invention, the recovered ashes will contain additional oxidic materials derived from the beneficiating slip. Otherwise the recovered ashes will be identical to conventional wood burning powerstation ash production.
The nature of the beneficial recovered ashes will next be described, these being the products of the second aspect of the present invention.
The product of the second aspect of the present invention is preferably an improved agronomic nutrient powder in the form of dry fine particulate powders.
A typical range of analysis of these products is: Calcia 25 to 90% weight Magnesia 5 to 40% by weight Phosphate 5 to 40% by weight Potash 5 to 40% by weight Sulphate 5 to 50% by weight With the above ranges of analysis it is possible and often desirable to define an agronomically appropriate oxidic ratio and to target that formulation via the selection of raw material quantities used in the production of the beneficiating slip.
In this way a preferred product formula may be produced.
An example of a preferred product formula from within the above ranges is: Calcia 40% Magnesia 10% Phosphate 15% Potash 15% Sulphate 10% Inert material such as silica plus trace elements and residual carbon 10% Typically the particle size ranges of the beneficiated ashes recovered, are: Furnace bottom ash 4mm down to sub micron Fly ash 0.5mm down to sub micron In the above forms, the improved agronomic nutrient powders obtained according to the present invention, require no further processing, other than bagging if preferred, for use in agriculture and or horticulture.
Typical applications for the improved agronomic nutrient powders will now be described.
The improved agronomic nutrient powders, according to the present invention may be advantageously used in or as any of the following agronomic products: Agricultural liming agent, providing some primary, secondary and tertiary nutrients.
Nutrified liming agent for ecological and subsistence farming.
Raw material for granular nutrified liming agents.
Raw material for speciality horticultural and agriculture fertilisers.
In all of the above applications, the improved agronomic nutrient powder, according to the present invention, provides advantageous soil pH adjustment and crop nutrification, in an economic format.
In all of the above applications, the improved agronomic nutrient powder, according to the present invention, provides environmental advantageous over the conventional usage of liming agents plus fossil fuel rich chemical fertilisers.
In all of the above applications, the improved agronomic nutrient powder, according to the present invention, provides for significant application equipment, fuel and labour savings via the elimination of the separate spreading of lime to the land.
The present invention provides a manufacturing route to agronomic nutrients with low carbon dioxide emissions.
Taken together it can be seen that the present invention provides significant advantages: a useful product is obtained by minor modification of a process which previously produced only waste.
Claims (15)
- C'aims 1. A process for making an agronomic nutrient product, the process comprising: (a) combining a wood-based fuel with one or more oxide precursors; and (b) combusting the mixture obtained in step (a).
- 2. A process according to claim 1 wherein the wood based fuel in step (a) comprises timber chips.
- 3. A process according to claim 1 or claim 2 wherein step (b) involves combusting the mixture in a wood burning powerstation.
- 4. A process according to any preceding claim wherein in step (a) the wood based fuel is combined with an aqueous composition comprising one or more oxide precursors.
- 5. A process according to any preceding claim wherein the one or more oxide precursors contains a source of one or more of calcium, magnesium, phosphorous, potassium and sulfur.
- 6. A process according to any preceding claim wherein the one or more oxide precursors is selected from lime kiln fines, dolomite lime stone kiln fines, calcined sewage sludge, ground bone meal, ground apatite ore, cement kiln dusts, felspatic stone quarry dusts, coal-burning powerstation flue gas desulfurising dusts and mixtures thereof.
- 7. A process according to claim 4 wherein the aqueous composition is dried onto the wood based fuel prior to step (b).
- 8. An agronomic nutrient product obtained by the process of any preceding claim.
- 9. An agronomic nutrient product according to claim 8 which is in the form of a powder.
- 10. An agronomic nutrient product to claim 8 or claim 9 which comprises oxides of one or more of calcium, magnesium, phosphorus, potassium and sulfur.
- 11. An agronomic nutrient product according to claim 10 which comprises 25 to 9Owt% calcia, 5 to 4Owt% magnesia, 5 to 40 wt% phosphate, 5 to 40wt% potash and 5 to 4Owt% sulfate.
- 12. A method of modifying the timber feed for a wood burning powerstation, the method comprising coating timber chips with an aqueous composition comprising one or more oxide precursors.
- 13. The timber chips produced by the method of claim 12.
- 14. A process for making an agronornic nutrient product substantially as hereinbefore described.
- 15. An agronomic nutrient product substantially as hereinbefore described.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0915747A GB2473439A (en) | 2009-09-09 | 2009-09-09 | A process for making an agronomic nutrient product |
PCT/GB2010/051425 WO2011030121A1 (en) | 2009-09-09 | 2010-08-27 | Agronomic nutrient powder and its method of obtention |
Applications Claiming Priority (1)
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GB0915747A GB2473439A (en) | 2009-09-09 | 2009-09-09 | A process for making an agronomic nutrient product |
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GB0915747D0 GB0915747D0 (en) | 2009-10-07 |
GB2473439A true GB2473439A (en) | 2011-03-16 |
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GB0915747A Withdrawn GB2473439A (en) | 2009-09-09 | 2009-09-09 | A process for making an agronomic nutrient product |
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GB (1) | GB2473439A (en) |
WO (1) | WO2011030121A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ307190B6 (en) * | 2017-01-24 | 2018-03-07 | Česká zemědělská univerzita v Praze | A mixture for fertilizer preparation, granules for fertilization of plants, the method of their production and their use |
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JPS6131376A (en) * | 1984-07-22 | 1986-02-13 | 長本 州平 | Fertilizer |
JPS61228096A (en) * | 1985-04-02 | 1986-10-11 | Fuso Kogyo Kk | Production of woody solidified fuel |
WO1987005044A1 (en) * | 1986-02-14 | 1987-08-27 | Kubat Josef | A method of facilitating comminution of wood and other types of vegetable biomass for use as fuel |
US6615751B1 (en) * | 1999-07-16 | 2003-09-09 | Raetech | Method for reducing agglomeration, sintering and deposit formation in gasification and combustion of biomass |
EP1837390A1 (en) * | 2006-03-23 | 2007-09-26 | Peter Brinkhege | Method and device for processing untreated wood or similar fuel |
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DE3921805A1 (en) * | 1988-07-05 | 1990-01-18 | Horst Prof Dr Bannwarth | Composition for fertilisation, soil improvement and protection of waterways |
US5249889A (en) * | 1992-04-27 | 1993-10-05 | Great Lakes/Enviroland, Inc. | Soil-less method for the reclamation of disturbed areas |
DE4244380A1 (en) * | 1992-12-29 | 1994-06-30 | Iseke Gmbh & Co | Reducing pollutant emissions from tar, etc |
DE10217932A1 (en) * | 2001-07-31 | 2003-02-13 | Franz Dietrich Oeste | Safety device comprises a unit for burning fuels and fuel additives, in which the combustion products contain iodine, iron, carbon, soot, aerosol-like iron oxides, gaseous iodine compounds and absorbed iodine compounds |
US20070140943A1 (en) * | 2005-12-21 | 2007-06-21 | Comrie Douglas C | Sorbent composition to reduce emissions from the burning of carbonaceous fuels |
US20070163476A1 (en) * | 2006-01-18 | 2007-07-19 | Comrie Douglas C | Apparatus for delivery of sorbent to a furnace during combustion |
DE102007014173A1 (en) * | 2007-03-21 | 2008-09-25 | Rheinbraun Brennstoff Gmbh | Grillbrikett |
-
2009
- 2009-09-09 GB GB0915747A patent/GB2473439A/en not_active Withdrawn
-
2010
- 2010-08-27 WO PCT/GB2010/051425 patent/WO2011030121A1/en active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6131376A (en) * | 1984-07-22 | 1986-02-13 | 長本 州平 | Fertilizer |
JPS61228096A (en) * | 1985-04-02 | 1986-10-11 | Fuso Kogyo Kk | Production of woody solidified fuel |
WO1987005044A1 (en) * | 1986-02-14 | 1987-08-27 | Kubat Josef | A method of facilitating comminution of wood and other types of vegetable biomass for use as fuel |
US6615751B1 (en) * | 1999-07-16 | 2003-09-09 | Raetech | Method for reducing agglomeration, sintering and deposit formation in gasification and combustion of biomass |
EP1837390A1 (en) * | 2006-03-23 | 2007-09-26 | Peter Brinkhege | Method and device for processing untreated wood or similar fuel |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CZ307190B6 (en) * | 2017-01-24 | 2018-03-07 | Česká zemědělská univerzita v Praze | A mixture for fertilizer preparation, granules for fertilization of plants, the method of their production and their use |
Also Published As
Publication number | Publication date |
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WO2011030121A1 (en) | 2011-03-17 |
GB0915747D0 (en) | 2009-10-07 |
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