ES2368046B1 - INSTALLATION OF VALUATION OF FATS AND / OR OILS OF VEGETABLE AND / OR ANIMAL ORIGIN. - Google Patents

Abstract

Installation of recovery of fats and / or oils of vegetable and / or animal origin, which comprises at least one storage enclosure in the liquid state of the products to be recovered, an engine and a circulation circuit of said products between the storage enclosure and the engine, said circuit comprising at least, in addition to a main inlet connected to the storage enclosure, at least one auxiliary fluid inlet to feed the circuit at least with water and with alcohol and / or alcohol derivative, at least one mixer static fed, by pumping, with fluids from said inlets, this mixer being arranged in series with at least one collection tank of the fuel emulsion from the mixer, forming this tank, interposed between the static mixer outlet and the feed inlet With engine fuel, a buffer volume to alleviate engine fuel consumption variations.

Description

to value.

Installation of recovery of fats and / or oils of vegetable and / or animal origin.

The present invention refers to an installation for the recovery of fats and / or oils of vegetable or animal origin.

Numerous industries, in particular the agri-food industries, produce, in the course of their activity, fats and / or oils of animal or vegetable origin qualified as waste from which they must be disposed of. This is the case, for example, of slaughterhouses or industrial deli. For a long time, these animal wastes or residues have been used for the manufacture of food for said animals. This practice is now prohibited. Fats or oils, known for their ability to burn, have led industrialists to use these products as fuel in boilers. The combustion allows to eliminate these by-products producing heat. However, a clean combustion needs the addition of expensive products. In addition, the thermal energy produced by valuing all the fats of an agri-food industrialist frequently exceeds the real needs of what result in problems of dimensioning or resale of energy. The other industrial routes used are the methanization that valorizes fatty wastes as combustible gas but does not eliminate its co-products since the substrate obtained must then be spread. Finally, biodigestion is a solution for the elimination of fatty wastes but does not value these wastes. Although the route of use of fats or oils as fuel, in particular as a liquid fuel, suitable for replacing diesel, has not been widely used, it is in particular because the rheological properties (viscosity, fluidity point, etc.) of Fats or oils make their direct use impossible in a diesel engine. Indeed, numerous studies have shown that the combustion of pure animal fat, even of short duration, causes serious engine fouling that can lead to its damage.

To get rid of the bad predispositions of animal fats to replace diesel, a chemical route has been proposed that uses a process of transforming fats into biodiesel through transesteri fi cation of fatty acids. This chemical route, although it provides good results, is very expensive due to the necessary equipment and excludes any possibility of an on-site installation, that is, at the place of production of the waste due to its price. Physical pathways provide acceptable results. These physical pathways consist in the dilution of fats by a fraction of diesel fuel and in the emulsion of the product obtained by a fraction of water.

Another technique is to emulsify fats in the presence of water and alcohol. These techniques allow obtaining a fuel without the addition of complex synthesis products and without any complex chemical reaction. Currently, the production of such a fuel has been developed in the laboratory using complex solutions with the help of dynamic mixers.

An objective of the present invention is therefore to propose an installation of the aforementioned type whose conception allows both elimination and recovery.

Another objective of the invention is to propose an extremely simple design installation that allows an in situ recovery, that is to say in the place of production of the fats and / or oils to be recovered, this recovery can be carried out online and continuously.

To this end, the object of the invention is an installation for the recovery of fats and / or oils of vegetable and / or animal origin, said installation comprising at least one storage enclosure in the liquid state of the fats and / or oils to be recovered. , an internal combustion engine and a circuit for the circulation of fats and / or oils to be recovered between the storage enclosure and the engine, said circuit comprising at least one, in addition to a main fluid inlet connected to the storage enclosure, by at least one auxiliary fluid inlet for feeding at least with water and with alcohol and / or alcohol derivative of said circuit, at least one mixer fed, by pumping, with fluids from said circuit inputs, this mixer being , suitable for forming from the components introduced into said circuit an emulsion of the water-in-oil type that can be used as a liquid fuel, arranged in series with at least one fuel emulsion collection tank, this tank forming, interposed between the output of the static mixer and the fuel inlet of the engine, an appropriate buffer volume to alleviate the variations in fuel consumption of the engine, characterized in that the storage enclosure and the circulation circuit of fats and / or oils to be recovered between the storage enclosure and the engine are equipped with heating means arranged respectively outside the storage enclosure and outside the circuit, because the mixer , arranged upstream of the collection tank, is a static mixer that takes the form of a vertically oriented duct with its or its fluid feed inlet (s) located at a level higher than its outlet (s) of evacuation of fluid, this duct being internally provided with hollow parts or with projections of blades or stationary fins which and ensure a mixture of the content of the conduit in the course of its axial displacement inside said conduit and because the collection tank is constituted by a storage tank of the fuel emulsion provided internally with at least one mobile stirring element of the Cuba content.

The use of a static mixer allows obtaining an emulsion in line at a lower cost from the fats and / or oils that circulate in said installation.

The use of a static mixer also allows a continuous production of liquid fuel that can be used as an engine fuel integrated in said installation. Also, the presence of a collection tank that forms a buffer volume and located, downstream of the static mixer, on the circulation circuit of the fats and / or oils to be recovered, between the storage area and the engine, allows an adaptation in continuous variations of engine fuel consumption. In fact, it is known that the engine, depending on its load, consumes more or less fuel. Thanks to the presence of the collection tank that forms a buffer volume, it is possible, regardless of the level of consumption of the engine, to optimally feed the latter.

According to a preferred embodiment of the invention, the installation is equipped with means that condition the operation of the fluid feed pump or pumps of the static mixer at the filling level of the collection tank.

Thanks to the presence of these conditioning means, the fl ow pump (s) of the mixer fl ow only works when the collection tank does not reach its maximum filling level. Again, this arrangement makes it possible to produce fuel almost continuously and to ensure in all circumstances a possibility of supplying engine fuel without the risk of overflowing said installation.

The invention will become more clearly apparent from reading the following description of embodiments, with reference to the unique figure that represents, in a simplified manner, the constituent elements of the installation according to the invention.

As mentioned above, the present invention relates to an installation for the valuation of fats and / or oils of vegetable and / or animal origin. Although numerous industrial fields can be provided, the invention provides more particularly for slaughterhouses that produce raw fatty co-products, industrial deli that produce cooked fatty co-products and, more generally, any agri-food industry that produces flotation fats. Of course, although the invention is described below more particularly in the case of an application to animal fats, the invention can be applied analogously to oils of vegetable origin or an animal-vegetable oil-fatty mixture. In the precise case of raw slaughterhouse co-products, a fusion is carried out, that is, a crushing and cooking of the co-products, and a three-phase separation is applied to said product in order to dissociate from pure fats, proteins and water. present in the waste. Only pure fats are used in the installation object of the invention.

With respect to cooking fats and floating fats, an extraction of the fat fraction can be carried out directly by means of a procedure that allows a separation between liquid-liquid or liquid-solid. These fats can therefore be animal fats constituted by the liquid phase resulting from the high-temperature liquid-solid separation of agri-food wastes from slaughterhouses. Each time, the previous treatments of these fats aim to eliminate water and solid impurities present in the waste. This pretreatment is necessary especially in the case of waste from slaughterhouses. Once the fat fraction of these wastes is obtained, the fats and / or oils to be recovered are stored in a storage space 1 and kept in said space in a liquid state. To this end, the storage enclosure 1 is equipped with heating means, such as a resistor, arranged outside the storage enclosure 1. These heating means allow reaching in said enclosure 1 a temperature between 45 and 60 ° C.

In addition to the storage enclosure 1, the installation also includes an internal combustion engine 2 and a circuit 3 for the circulation of fats and / or oils to be recovered between the storage enclosure 1 and the engine

2. This circuit 3 comprises at least, in addition to a main fl uid inlet 4 connected to the storage enclosure 1 and which allows the feeding of the circuit 3 with grease and / or oils to be recovered, at least one auxiliary fl uid inlet 5 for feeding the circuit at least with water and with alcohol and / or with alcohol derivative.

The circuit 3 for the circulation of fats and / or oils to be recovered may comprise one or more auxiliary inputs. In fact, it can comprise either an auxiliary input connected to an aqueous fluid circuit power supply containing at least water and an alcohol and / or an alcohol derivative, or two auxiliary inputs connected one to a power source from the circuit with aqueous fl uid, in particular water, and another to an alcohol storage reserve or an alcohol derivative. This is the case of the example shown in which the circuit comprises two auxiliary inputs represented one in 5 and connected to a power supply 15A of the circuit with aqueous fl uid, in the example with water, the other in 6 and connected to a reserve 15B of storage of alcohol and / or an alcohol derivative.

In the examples shown, the circulation circuit 3 further comprises a supplementary auxiliary inlet 7 connected to a reservoir 15C of surfactant. Obviously, this supplementary auxiliary input 7 is not mandatory. It will be noted that, in the examples shown, the circuit is, at first, fed with alcohol and then with surfactant and then with water. Alcohol or alcohol derivative is therefore introduced in circuit 3 before water. All the components necessary for the production of an emulsion are introduced into the circuit 3 in a fluid form.

Thanks to the components considered, the fuel, obtained from said components, can have a composition expressed in volume with respect to the total volume of said composition, as follows:

-

oils or fats: 68-90%

-

water: 5-15%

-

Alcohol and / or alcohol derivative: 5-15%

-

surfactants: 0-2%.

In addition to its main entrance and its or its auxiliary inputs, the circuit 3 for the circulation of fats and / or oils to be recovered between the storage space 1 and the motor 2 comprises at least one static mixer 26. This static mixer 26 is fed with fluids from said circuit inputs by pumping. In fact, preferably, the installation comprises, for each fluid to be introduced into the circuit 3 of the circulation of the fats and / or oils to be recovered, a dosing pump for bringing said fluid to the circuit. Thus, as the single figure illustrates, the pump 11 allows the fats and / or oils to be recovered to the circuit 3, the pump 12 allows the introduction of water into the circuit, the pump 13 the introduction of alcohol and / or a Alcohol-derived in the circuit and the pump 14 the introduction of surfactant into said circuit.

In a characteristic manner of the invention, the installation is equipped with means 27, 28 that condition the operation of the pump (s) 11, 12, 13, 14 with fluid feed of the static mixer 26 at the tank filling level 8 collection. These pumps generally work in synchronism. This collection tank 8, which is arranged in series with the static mixer 26 is interposed between the output of the static mixer 26, and the fuel feed inlet 16 of the engine 2. It thus allows the formation of a buffer volume upstream of the Fuel inlet or fuel inlet 16 of the engine so that the engine can, whatever the required load, be optimally fed.

In the examples shown, this collection tank 8 is constituted by a storage tank 9 of the fuel emulsion fueled with fuel at least by an inlet 8A connected to the outlet of the static mixer 26. This tank 9 is internally provided with at least one mobile stirring element 10 of the contents of the tank 9. The tank 8 then constitutes a dynamic mixer. This mobile organ 10 is constituted in this case by a rotating blade shaft. Level sensors that detect one, 28, the minimum filling level of the collection tank 8, the other, 27, the maximum level of filling the collection tank 8, are also arranged inside this collection tank 8 , 28. These sensors emit a signal in the direction of a control relay of the pumps 11 to 14 that allow the fluid supply of the circuit 3 when the fuel level of the collection tank 8 is lower than the maximum level. These level sensors therefore constitute means that condition the operation of the fluid feed pump (s) of the static mixer 26 at the level of the filling of the collection tank 8. When the collection tank 8 is equipped with a mobile stirring element, it performs the function in addition to a dynamic mixer that completes and reinforces the action of the static mixer 26 for the formation of the emulsion.

The advantage of using a static mixer allows to obtain an in-line production of the emulsion. This static mixer 26 takes the form of a conduit internally provided with hollow or raised parts, of the type blades or fins, stationary that ensure a mixture of the contents of the conduit in the course of its axial displacement inside said conduit. The conduit constituting the static mixer 26 is oriented vertically with its or its fl uid feed inlet (s) located at a level higher than its or its fl uid discharge outlet (s) so that it also favors a circulation through gravity of the fluid inside said mixer.

Preferably, in the example shown, the static mixer used is a known tubular type mixer manufactured by the Verder company. The serial use of a static mixer and a dynamic mixer allows the formation of a homogeneous fine emulsion. Liquid or biofuel from these mixing stages is then used to continuously feed the internal combustion engine 2.

The installation is preferably an installation of the type in which at least a part of the fuel that feeds the engine 2, in particular the injection circuit 23 of the engine 2, is driven by means of an appropriate conduit 19, called the discharge conduit. Preferably, the collection tank 8 comprises a second liquid fuel feed inlet 8B, said inlet 8B being connected to the mouth of the engine drive conduit 19 activated when the engine feeding with fuel from the circulation circuit 3 takes place. the fats and / or oils to be recovered.

The engine 2 is preferably a hybrid engine that works alternately from one or the other of two selectively activatable liquid fuel sources 3, 18, one of the sources 3, 18 being constituted by the circuit 3 for the circulation of fats and / or oils to be recovered, and the other by a reserve 18 of fuel or diesel.

Thus, the fuel or diesel reservoir 18 is used more particularly when the start-up phase of the engine 2 takes place and after the production stop of the liquid fuel based on grease and / or oil to be recovered. The engine is therefore powered by its reference fuel, such as fuel or diesel, before and after any use of the liquid fuel obtained from the fats and / or oils to be recovered.

The installation is, in this particular case, equipped with a switching element 17, such as a valve, arranged in, or in the vicinity of, the fuel supply inlet 16 of the engine 2 for the passage of a power supply of fuel to another depending on the desired fuel for the engine power.

When the installation is of the type in which at least a part of the fuel that feeds the engine 2, in particular the injection circuit 23 of the engine 2, is driven by means of an appropriate conduit 19, called the discharge conduit, the installation it is preferably equipped with at least two conduits 19, 20 for driving the liquid fuel of the engine, said conduits 19, 20 being selectively activated according to the activated fuel power supply. Thus, when the fuel power supply is constituted by the circuit 3 for the circulation of the valued fats and / or oils, it is the discharge conduit 19 which is activated. Conversely, when it is the fuel reserve 18 that is used, it is the discharge conduit 20 that is activated. Again, a switching element 21, such as a valve, is provided that allows the passage of one discharge conduit to another. Preferably, valves 17 and 21 operate in synchronism and are sent from the same control organ. It will be noted that the switching element 21, between the two drive ducts, is located between the engine injection system 23 and the combustion chamber 22 of the engine 2.

In the particular embodiment of the invention, in which at least a part of the fuel that feeds the engine 2, in particular the injection circuit 23 of the engine 2, is driven by means of an appropriate conduit 19, the mouth of which is connected to the second input 8B with liquid fuel of the collection tank 8 when the activation of the power supply with fuel constituted by the circuit 3 of circulation of the fats and / or oils to be recovered takes place, the fuel driven by the Engine 2 is directly reintroduced into the collection tank 8 which forms a buffer volume. This liquid fuel can then be reintroduced, at any time, into the engine 2 through the fuel inlet 16 of the engine 2. Thus a closed loop circuit of at least a part of the fuel necessary for the fuel is established. operation of the engine 2 between the collection tank 8 and the engine 2. The collection tank 8 therefore has two functions: one that consists of serving as a buffer volume that allows the amount of biofuel produced to be adapted to the effective consumption of the engine, the other of recovery of the biofuel expelled by the engine when it does not work at full load. Motor 2 can then be used for various applications.

In the example represented in the single figure, this motor 2, represented in the form of a block with the help of dashed strokes, is a cogeneration motor associated at least with one part to a generator 24, on the other hand to an exchanger 25 of heat with a view to the production of electrical and thermal energy. In effect, this engine is connected to an alternator that converts mechanical work into electricity. In addition, a recovery of heat from the exhaust gases and in the engine cooling system is possible.

The electrical efficiency (ratio between the electrical power produced and the calorific value of the fuel consumed) of the installation is between 25 and 35%. The thermal efficiency (ratio between the useful thermal energy produced and the calorific value of the fuel consumed) can reach 45% if appropriate heat exchangers are used. Obviously, it is also possible to suppress the heat exchangers represented.

The installation is an electricity production installation whose motor 2 constitutes one of the elements of an electric generator. This application is preferred.

The in-line emulsification process for grease and / or oil uses a static mixer associated or not with a dynamic mixer. The mixing system comprising the static mixer only

or the static mixer and dynamic mixer assembly is designed to reduce the average diameter of the water drops below 100 μm. The alcohol

or alcohol derivative added in the circuit is preferably a lower C1-C10 alcohol, preferably a C1-C4 alcohol, such as methanol or ethanol. Also, the surfactant, when present, has an HLB number of less than 10, preferably between 3 and 6.

In order to avoid any damage to the installation, and in particular any coagulation of the fats and / or oils in circuit 3 of the installation, it is provided, in at least a part of the circuit 3 of circulation of fats and / or oils to valorising, means of heating the contents of the circuit, said heating means being arranged outside the circuit 3. These heating means are generally in the form of electrical resistance or a hot water circulation circuit, the water having been heated from the heat released by the engine 2. The purpose of these heating means is to maintain a temperature generally between 35 ° C and 60 ° C inside the circulation circuit 3 and the different elements that constitute this circuit.

In its base version, the installation, as described above, can simply comprise a vat 1 for storing the oils and / or greases to be recovered, a circuit for the circulation of fats and / or oils to an engine with a main entrance and an auxiliary fluid feed inlet, said fl uid being presented in the form of a mixture containing at least water and alcohol and / or an alcohol derivative, a static mixer and a fuel storage tank from the mixer arranged on said circuit and an engine fed from the fuel that constitutes the engine fuel contained in the tank 8 that forms a buffer volume. This results in an extremely simple design installation.

Claims (11)

one.

Installation of recovery of fats and / or oils of vegetable and / or animal origin, said installation comprising at least one storage enclosure in a liquid state of the fats and / or oils to be recovered, an internal combustion engine (2) and a circuit (3) for the circulation of greases and / or oils to be recovered between the storage enclosure (1) and the engine (2), said circuit (3) comprising at least, in addition to a fluid inlet (4) main connected to the storage enclosure (1), at least one auxiliary fluid inlet (5, 6, 7) for feeding at least with water and with alcohol and / or alcohol derivative of said circuit (3), by at least one mixer (26) fed, by pumping, with fluids from said circuit inputs (4, 5, 6, 7), this mixer (26) being, suitable for forming from the components introduced into said circuit ( 3) a water-in-oil type emulsion that can be used as a liquid fuel, you have to series with at least one fuel emulsion collection tank (8), forming this tank (8), interposed between the static mixer outlet (26) and the fuel inlet (16) of the engine (2) ), an appropriate buffer volume to alleviate the variations in fuel consumption of the engine, characterized in that the storage enclosure (1) and the circulation circuit (3) of the fats and / or oils to be recovered between the enclosure (1) of storage and the motor (2) are equipped with heating means arranged respectively outside the storage enclosure (1) and outside the circuit (3), because the mixer (26), arranged upstream of the tank (8) collection is a static mixer that takes the form of a vertically oriented conduit with its or its fluid feed inlet (s) located at a level higher than its or its fluid drain outlet (s), being this conduit provided internally T of hollow or raised parts of blades or stationary fins that ensure a mixture of the contents of the conduit in the course of its axial displacement inside said conduit and because the collection tank (8) is constituted by a tank ( 9) storage of the fuel emulsion internally provided with at least one mobile stirring element (10) of the contents of the tank (9).

2.

Installation according to claim 1, characterized in that it is equipped with means (27, 28) that condition the operation of the pump or pumps (11, 12, 13, 14) with fluid feed of the static mixer (26) at the filling level of the deposit

(8) collection. 3. Installation according to one of claims 1 and 2, characterized in that the circulation circuit (3) of the fats and / or oils to be recovered comprises at least two auxiliary inputs connected one (5), to a power supply (15A) from the circuit with aqueous fl uid, another (6) to a reservoir (15B) for storing alcohol and / or an alcohol derivative, and possibly a supplementary auxiliary inlet (7) connected to a reservoir (15C) of surfactant. 4. Installation according to one of claims 1 to 3, characterized in that the installation comprises, for each fluid to be introduced into the circulation circuit (3) of the fats and / or oils to be recovered, a dosing pump brought from said fluid to said fluid. circuit, operating said pumps (12, 13, 14), conditioned in operation at the filling level of the tank (8) collection, in synchronism.

5.

Installation according to one of claims 1 to 4, characterized in that the collection tank (8) comprises a second feed inlet (8B) with liquid fuel, said inlet (8B) being connected to the mouth of the motor drive duct (19) activated when the engine is supplied with fuel from the circuit (3) for the circulation of fats and / or oils to be recovered.

6.

Installation according to one of claims 1 to 5, characterized in that the engine (2) is a hybrid engine that works alternately from one or the other of two power sources (3, 18) of selectively activatable liquid fuel supply, being one (3) of the sources (3, 18) constituted by the circuit (3) of circulation of the fats and / or oils to be recovered, the other by a reserve (18) of fuel or diesel.

7.

Installation according to claim 6, characterized in that it is equipped with a switching element (17), such as a valve, arranged in or in the vicinity of the fuel inlet (16) of the engine (2) for the passage of a fuel power source to another depending on the needs of the engine.

8.

Installation according to one of claims 6 or 7, of the type in which at least a part of the fuel that feeds the engine (2), in particular the engine injection circuit (23), is driven by means of an appropriate conduit (19), called the impulsion conduit, characterized in that it is equipped with at least two conduits (19, 20) for driving the liquid fuel of the engine, said conduits (19, 20) being selectively activated depending on the source of feeding with activated fuel.

9.

Installation according to one of claims 1 to 8, characterized in that said installation is an electricity production installation whose motor

(2) constitutes one of the elements of an electric generator. 10. Installation according to claim 9, characterized in that the motor (2) of the installation is a cogeneration motor associated at least on one side with a generator (24), on the other hand with a heat exchanger (25) with views to the production of electrical and thermal energy. SPANISH OFFICE OF THE PATENTS AND BRAND Application no .: 200802591 SPAIN Date of submission of the application: 05.09.2008 Priority Date: REPORT ON THE STATE OF THE TECHNIQUE 51 Int. Cl.: F02M37 / 00 (2006.01) B01F3 / 08 (2006.01) RELEVANT DOCUMENTS

Category

Documents cited Claims Affected

Y

FR 2875810 A1 (ECOLE DES MINES DE NANTES) 31.03.2006, page 2, line 22 - page 3, line 15; page 6, lines 17-22. 1-10

Y

JP 63235654 A (TAKAHASHI OSAMU) 30.09.1988, summary; figures. 1-10

Y

WO 0129154 A1 (PETROCARE B V et al.) 26.04.2001, page 4, lines 6-17; figure. 6-8

TO

one

TO

WO 2007001172 A1 (POWERTECH PROJECTS & CONTRACTS et al.) 04.01.2007, page 4, line 10 - page 6, line 1; figures. 1,6-10

TO

US 6656236 B1 (COLEMAN GERALD N et al.) 02.12.2003, column 10, line 57 - column 12, line 39; figure. 1-4

Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application

This report has been prepared • for all claims • for claims no:

Date of realization of the report 27.10.2011

Examiner J. Galán Mas Page 1/4

REPORT OF THE STATE OF THE TECHNIQUE Application number: 200802591 Minimum documentation sought (classification system followed by classification symbols) F02M, B01F Electronic databases consulted during the search (database name and, if possible, terms of search used) INVENES, EPODOC State of the Art Report Page 2/4  WRITTEN OPINION Application number: 200802591 Date of Completion of Written Opinion: 10.27.2011 Statement

Novelty (Art. 6.1 LP 11/1986)

Claims Claims 1-10 IF NOT

Inventive activity (Art. 8.1 LP11 / 1986)

Claims Claims 1-10 IF NOT

The application is considered to comply with the industrial application requirement. This requirement was evaluated during the formal and technical examination phase of the application (Article 31.2 Law 11/1986).  Opinion Base.- This opinion has been made on the basis of the patent application as published. State of the Art Report Page 3/4  WRITTEN OPINION Application number: 200802591 1. Documents considered.- The documents belonging to the state of the art taken into consideration for the realization of this opinion are listed below.

Document

Publication or Identification Number publication date

D01

FR 2875810 A1 (ECOLE DES MINES DE NANTES) 03.31.2006

D02

JP 63235654 A (TAKAHASHI OSAMU) 30.09.1988

D03

WO 0129154 A1 (PETROCARE B V et al.) 04.24.2001

D04

WO 2007001172 A1 (POWERTECH PROJECTS & CONT. Et al.) 04.01.2007

D05

US 6656236 B1 (COLEMAN GERALD N et al.) 02.12.2003

2. Statement motivated according to articles 29.6 and 29.7 of the Regulations for the execution of Law 11/1986, of March 20, on Patents on novelty and inventive activity; quotes and explanations in support of this statement Document D01 describes the use of a liquid fuel comprising an emulsion of animal or vegetable fats to feed diesel internal combustion engines, the composition of which is (see page 6, lines 17-22) essentially coinciding with the of the fuel obtained in the embodiment described in the present application. In addition, this document describes that to obtain said emulsion a process is used in which the mixture is stirred and heat is supplied. The object of claim 1 differs from the state of the art described in that the installation for obtaining the fuel emulsion as claimed is not described herein. However, to obtain a fuel emulsion, document D02 already describes an installation (see figure 2) comprising a storage enclosure in the liquid state of a main fluid, an internal combustion engine (12) and a circulation circuit of fluid between the storage enclosure (1) and the motor (12), said circuit comprising, in addition to a main fluid inlet (4) connected to the storage enclosure (1), an auxiliary fluid inlet (6) for feeding with water and alcohol of said circuit, a mixer (7) fed, by pumping, with fluids from said circuit inlet (6), this mixer (7) being suitable for forming from the components introduced in said circuit an emulsion that can be used as a liquid fuel, arranged in series with a fuel emulsion collection tank (8), forming this tank (8), interposed between the static mixer outlet (7) and the inlet of engine fuel supply (12), an appropriate volume to alleviate engine fuel consumption variations. Although it is not described in the available summary of document D02 that it warms the components and that it finally has a stirring element, these characteristics, as mentioned, were already contemplated in document D01. Therefore, the only claimed feature that is not described in the state of the art is that the mixer (7), described in document D02, be of a vertically oriented static type. However, it is considered that the use of such a mixer is a design option available to a person skilled in the art, even more when it is mentioned in the description itself that the mixer used is a known Verder brand. Consequently, the object of claim 1 does not imply inventive activity according to article 8 of Law 11/1986. Likewise, claims 2 to 5 and 9 to 10 refer to details that either are already present in documents D01 and D02, or are considered obvious to the person skilled in the art, whereby said claims 2 to 5 and 9 to 10 do not imply inventive activity according to article 8 of Law 11/1986. On the other hand, claims 6 to 8 relate to engine operation by selecting the fuel from two sources. It is considered that this operation is technically independent of the characteristics of the preceding claims since for this operation it does not matter how the fuel has been obtained. In this sense, document D03 already describes an engine that can work alternatively with conventional fuel or with a fuel based on animal fats and which has the claimed characteristics, so it is obvious that the person skilled in the art could use the fuel emulsion described in D01 instead of the animal fat-based fuel described in document D03, whereby said claims do not imply inventive activity according to article 8 of Law 11/1986. State of the Art Report Page 4/4