WO2013026990A1 - Triple-flow lignocellulosic-biomass burner that generates combustion gases having a controlled oxygen content - Google Patents

Abstract

The invention relates to a lignocellulosic-biomass burner, which includes an outer body (1) forming a column internally arranged with a receiving portion (1a) filled with lignocellulosic biomass (3) forming a heating body (1a) and, around the latter and on a portion of the peripheral edge thereof, a chamber (4) for dispensing and circulating a fuel gas (G2), the height of the heating body being less than that of the column so as to define, at the top thereof, a passage (1b) for circulating said fuel gas (G2), the column of the burner being in communication, via the bottom portion thereof, with a heat chamber (6).

Description

 LIGNOCELLULOSIC BIOMASS BURNER WITH TRIPLE FLUX WITH GENERATION OF COMBUSTION GAS WITH CONTROLLED OXYGEN CONTENT. The invention relates to the technical sector of combustion appliances, and in particular biomass burners including from sawdust type waste, forest residues and agricultural residues.

Sustainable development and the treatment of renewable energies appear to be the only solutions to reduce dependence on fossil fuels, taking into account the gradual and rapid depletion of these energies, and also to control and reduce the carbon footprint during production. heat and more generally during the production of energy. All research and development work is done in this way with a very strong awareness of individuals and also through information actions and development programs proposed by the public authorities, with for example in France recently the work relating to the Grenelle de l'Environnement in 2007-2009.

Thus, some have focused on the energy recovery of biomass, which constitutes a considerable source of supply by respecting the aforementioned objectives. Biomass burners are thus known, mainly treating sawdust products. In practice, such burners are not suitable for processing more granulometric products and the conditions of use and operation therefore remain limited. In addition, the The combustion initiated by the burners of this type is carried out in a very conventional manner, sufficient for sawdust products with a small particle size.

As part of the exploitation of materials from fossil fuels such as coal, various coal combustion solutions have been proposed.

Patent FR 1 370 041 discloses a process for the combustion of agglutinating fatty carbons implemented with a boiler incorporating a heat exchanger. The object of this patent is therefore to produce heat and to transmit it to an exchanger thanks to a total and optimized combustion of the fuel. It is therefore necessary and absolute to have excess air. Thus, in this patent FR 1 370 041, the method described implements three gaseous flows, all made up of air: a primary air flow, a secondary air flow and an optional air flow. The primary air required for the first combustion is introduced via three air inlets, Fl at the hot combustion zone, F2 at the pre-combustion zone and F3 under the hearth (13). The secondary air after combustion is introduced via two air inlets (F4-F5) located under the sole of the post combustion. The additional air inlet called tertiary air F6 makes it possible, if necessary, to add air for certain types of coals, which, in spite of the post combustion stage, generate unburned gases. Thus, this diversified supply of air is justified by the difficulty of burning coal, the coal requiring combustion in excess of oxygen, that is to say in excess of air. In addition, the patent FR 1 370 041 requires a step of mechanical preparation of the coal before its combustion by a grinding operation as the carbons agglutinated to increase the exchange surface between the solid and oxygen so that the oxidation or combustion is improved. The Applicant's approach is absolutely not about the combustion of coal that is fossil fuel but lignocellulosic biomass with consequently very different structural characteristics. By nature, coal and lignocellulosic biomass have neither the same chemical composition nor the same molecular organization and consequently, the combustion temperatures and the resulting materials of the latter (ashes, gases and tars) are not the same.

Patent EP 624 756 also discloses a method exclusively for burning wood with the production of hot air and the use of oxygen probes to check the smooth running of the combustion.

The Applicant's approach is quite different, indeed its objective is on the one hand to design a process and a lignocellulosic biomass burner producing a flame and thus allowing the generation of hot combustion gases, whose oxygen content and the temperature are adjusted according to the intended application and the characteristics of the treated lignocellulosic biomass.

Considering the energetic valorization of the biomass which is directly related to the invention, the Applicant's approach was to apprehend the valorization of lignocellulosic biomass in a much wider variety of products and very different particle size, for example since sawdust to the woodchip through the pellet. Another desirable objective of the Applicant is to allow the combustion of lignocellulosic biomass clean, unpolluted, type forest or agricultural residues, with therefore differentiated particle sizes, thus providing a capacity and volumes of products to burn much larger.

Another desirable objective of the Applicant is to allow combustion of lignocellulosic biomass less selective and to reduce production costs.

Another object of the invention is to allow a treatment of biomass in differentiated states, for example raw biomass or roasted biomass. Another object sought according to the invention is to allow the treatment of lignocellulosic biomass with a very wide range of thermal powers.

Thus, the Applicant's approach has been to design a new type of lignocellulosic biomass burner meeting the various aforementioned objectives with an increased capacity of constitutive lignocellulosic biomass type varieties, with very variable grain sizes, and a differentiated initial state. The solution developed by the Applicant meets all these objectives, by the implementation of a burner with specific characteristics and operating in different and new conditions compared to the state of the art and known to the Applicant. This solution is implemented by a very particular process that allows the combustion of lignocellulosic biomass in an optimized way.

According to a first characteristic of the invention, the lignocellulosic biomass burner is remarkable in that it comprises a column-forming outer body arranged on the one hand with a receiving portion and filled with lignocellulosic biomass forming a heating body and around the latter on a part of its perimeter peripheral with a distribution chamber and circulation of a fuel gas, and in that the height of the heating body is lower than that of the column, so as to delimit at the top a passage of circulation of said combustible gas, and in that the supply of the lignocellulosic biomass inside the burner in the receiving part is effected by a continuous feed means, and in that the burner column opens with its lower part towards a thermal chamber and a nozzle of the flame passage, and in that the distribution and circulation chamber of said surrounding fuel gas the heating body opens at the bottom of the burner at the junction of the burner with the thermal chamber and the flame-passing nozzle, and in that the burner comprises two primary and secondary air supply circuits, allowing generating three gas flows, said gas flows being two air flows and a flow of fuel gas directed and circulating inside the burner, and together producing a secondary combustion for the emission of an outgoing gas and allowing the treatment of organic products derived from biomass, and in that the burner structure defines four specific zones, a primary combustion zone, a lignocellulosic biomass gasification zone, a filtration zone, said zones lying successively in the body of heating, and a secondary combustion zone, and in that the filtration zone is defined by a bed of lignocellulosic biomass allowing the filtration of the combustible gas. e issued the gasification of the lignocellulosic biomass in the gasification zone, and in that said air flows and the flow of fuel gas are directed to the secondary combustion and flame production zone. According to another characteristic, the method for burning lignocellulosic biomass in a biomass burner is remarkable in that it implements the emission and management of three gas flows, two air flows and a flow of combustible gas. , and a solid stream of biomass, and areas of the burner comprising a primary combustion zone, a gasification zone, a filtration zone and a secondary combustion zone, and in that the first flow, a flow of air, passes through the primary combustion zone inside the burner body, and in that the second flow, a combustible gas stream, passes through the gasification and filtration zones to transport an organic substance from the biomass to the secondary combustion zone, and in that the third flow, a flow of air, generates the secondary combustion, and in that the three gas flows meet at the front of the burner to define a secondary combustion zone allowing e generate a flame and a regulated outgoing gas flow in temperature and oxygen content.

These and other characteristics will be apparent from the rest of the description.

For fixing the object of the invention illustrated in a nonlimiting manner to the figures of the drawings where:

FIG. 1 is a schematic view of the principle of the biomass burner according to the invention implementing a gas distribution according to a triple flow, FIG. 2 is a partial cross-sectional view at the level of the primary and secondary combustion zones,

 FIG. 3 is a view showing the biomass burner with the nozzle with the introduction of an air distributor of the first air flow (Gl) in the first air intake circuit,

 - Figure 4 is a view similar to Figure 3 but without air distributor of the first air flow (Gl) in the first air supply circuit.

In order to make the object of the invention more concrete, it is now described in a nonlimiting manner illustrated in the figures of the drawings.

The lignocellulosic biomass burner is referenced as a whole by (B). It comprises an outer body (1) forming a column arranged internally with on the one hand a part (la) receiving and filled with the lignocellulosic biomass (3) forming a heating body and around it on a part of its peripheral periphery with a chamber (4) for distributing and circulating a specific gas, as will be explained later. The height of the heating body is lower than that of the column, so as to define in the upper part a passage (1b) of gas flow. The supply of the lignocellulosic biomass (3) inside the burner in the receiving part is carried out by a continuous supply means (5) of any known type, comprising for example an Archimedean screw or the like. The biomass treated is based on lignocellulosic products, according to different forms in granules, platelets or others with a variable particle size. The column of the burner is in a vertical position, and opens at its bottom to a thermal chamber (6) and a nozzle of the flame passage. Furthermore, the chamber (4) for dispensing and circulating a specific gas surrounding the heating body (la) opens at the bottom of the burner at the junction of the burner with the thermal chamber (6) and the flame passage nozzle. The lower part of the burner is arranged with a receptacle (7) for collecting ash.

The lignocellulosic biomass burner according to the invention is designed to generate a triple flow of gas and a solid flow that will allow optimized combustion of the biomass by implementing a hybrid solution with both the principle of gasification and the principle of solid combustion. The implementation of the burner according to the invention generates three different gaseous flows referenced (G1-G2-G3), two flows (G1-G3) being air flows, the flow (G2) being a fuel gas, and a solid flow of lignocellulosic biomass (FS), with the objective and result of the best possible combustion of the biomass, regardless of the size of the treated biomass particles and allows a simultaneous control of the residual amount of oxygen present in the gas stream at the outlet of the burner.

In order to ensure the flow distribution (G1-G2-G3), the burner comprises two air supply circuits on the one hand primary air, and secondly secondary air. The first primary air circuit (C1) corresponding to a primary air flow (G1) comprises a duct (8) with a fan (9) opening into the lower part of the heating element at the primary combustion zone portion. (ZI). This duct (8) is arranged in the heating body allowing the passage of the flow (Gl) and intended to supply the primary combustion of a portion of the biomass present at the bottom of the heating body. This first air circuit (Cl) includes a temperature controlled valve (VI) measured by a thermocouple (T2) located in the thermal chamber (6). This valve (VI) allows the modulation of the combustion temperature by adding more or less air (Gl). This controlled intake of air and thus oxygen directly affects the thermal power generated by the device. This has been illustrated in FIGS. 3 and 4 and it also integrates into the duct illustrated in FIG. 1 which remains a schematic diagram of the burner. FIG. 1 is a schematic diagram of the first circuit

(Cl) with a duct (8) for the circulation of the primary air flow (Gl) which supplies the primary combustion.

In the representations in FIGS. 3 and 4, the duct (8) is arranged respectively with a flow distributor (10) making it possible to split the air flow (Gl) in two after the primary combustion step, and without a distribution splitter. air flow (Gl).

In the different cases of FIGS. 1, 3 and 4, the combustion gases originating from this primary combustion zone are oriented in two identified flows (Gl) and (G2). The part of gas sent towards the front of the burner and producing on the front face small flames remains denominated (Gl). The portion of gas intended to rise upwards in the heating body and supplying the energy necessary for the gasification of the biomass is then identified by (G2). It is called combustible gas as it will appear later. Figures 3 and 4, the different arréchages perfectly illustrate the flow of said flows (Gl) and (G2) in the illustrative examples of flow distributions. The second secondary air circuit (C2), corresponding to a secondary air flow (G3), opens into the lower part of the burner in the secondary combustion zone at the junction with the arrival of the various flow streams. gas (G1 and G2), according to their respective paths as it will be exposed later. This second circuit (C2) implements a fan (1 1). This second air circuit (C2) includes a regulating valve (V2) controlled by the oxygen content measured with a measuring probe (O2) in the flow leaving the thermal chamber and therefore allows to regulate the oxygen content residual in the gas stream leaving the burner. The modulation of this valve modifies the characteristics of the secondary combustion. In fact, this air circuit makes it possible to obtain an extensive range of combustion: from stoichiometric combustion to combustion with a large excess of oxygen. Another thermocouple (T1) disposed upstream in the thermal chamber allows another temperature control. The burner according to the invention being defined in its structure, it is necessary to identify the different zones thereof, which allow its implementation and the management of the different gas flows (G1-G2-G3) and solid (FS) .

A first zone (ZI) said primary combustion is located inside and in the lower part of the heating body. It is in close connection with the circuit (Cl) and generates the fluxes (Gl) and (G2). This zone (ZI) serves to burn part of the lignocellulosic biomass contributed by the flux (FS) corresponding to the introduction of the lignocellulosic biomass inside the column and specifically into the heating body of the column. burner. This primary combustion zone also provides the energy necessary for the gasification of the biomass. This double action leads to oxygen depletion of the incoming gas stream, referred to as the primary air stream. This combustion zone is constantly fed with primary air containing oxygen in order to allow the complete combustion of the lignocellulosic biomass located in this zone. This combustion leads to the oxygen depletion of the primary air flow as it passes through the biomass, and also to the supply of the energy required for the gasification of the lignocellulosic biomass that takes place on the layers of solids located above of the primary combustion zone. In practice, the combustion gases from this primary combustion zone, which are poor in oxygen, are oriented along two streams (Gl) and (G2) according to FIGS. 1, 3 and 4. Part of the gas stream coming from the zone of primary combustion and low oxygen, flow (Gl) said primary combustion is sent to the front of the burner and produced on the front of small flames. This is located at the junction of the lower part of the heating body with the junction zone of the thermal chamber (6), and the chamber (4) surrounding the heating body. The other gas stream (G2) is returned in the column of the heating body to the gasification zone (Z2) upwards, in order to heat the lignocellulosic biomass and provide the energy required for the gasification process of said biomass.

This second zone (Z2), called the gasification zone, is located inside the heating body, just above the primary combustion zone (ZI). This gasification zone (Z2) generates large volumes of organic-rich gases which enrich the flow (G2) as it passes through this zone (Z2) of the burner. The gaseous decomposition of the biomass thus generates combustible gases that are entrained by the flow (G2) towards the top of the burner towards the third zone (Z3), called the filtration zone. In addition to the formation of fuel gases, the zone (Z2) of gasification acts as a zone of thermal preparation of the biomass by extraction of the volatile organic substances that will be used as fuel flow in the zone (Z4). Thanks to the overpressure resulting from the formation of the gasification gases in the zone (Z2) and to the restriction of section present at the junction of the heating body and the nozzle, the flow (G2) is naturally sucked towards the top of the column of the heating body towards the filtration zone. The decomposition of the biomass by gasification produces gaseous species which leads to the appearance of a local overpressure at this level of the burner. This overpressure added to the section restriction at the junction heater / nozzle explains that part of the flow (Gl) is directed upwards towards the zones (Z2) and (Z3) according to a suction effect .

Above this gasification zone is the filtration zone (Z3) located inside the heating body. This zone (Z3) makes it possible to filter the tars (liquid organic materials) contained in the stream (G2), to distil them and to fragment them before reinjecting them through the stream (G2) on the front of the burner to be completely burned . During this filtration the flow (G2) is naturally cooled to temperatures of the order of 60-70 ° C. Then, the flow (G2), after passing through the zones (Z2) and (Z3), is directed through the chamber (4) surrounding the heating body in a downward direction at the junction with the thermal chamber. (6). The stream (G2) further transports the tar fragments at this location thus allowing them to be burned. During its passage in this chamber (4), the flow (G2) remains in the hot state (> 60 ° C) by its contact with the walls of the heating body, which avoids any condensation of tars or other materials such as that pyroligneous juice inside the heating body. The lignocellulosic biomass is presented above the primary combustion zone (ZI) according to the filtration zone (Z3) by constituting a bed of biomass established over a determined height of the heating body. This bed of cellulosic biomass filters the gas stream (G2) from the gasification zone (Z2) and moving up the burner.

The function and the objective of this step in zone (Z3) is to collect on lignocellulosic biomass particles by deposition and condensation the tars transported by the flux (G2). Then, thanks to the thermal energy of the system, the tars collected are distilled and then fragmented. Distillation and fragmentation phenomena are possible because the lignocellulosic biomass bed has a temperature gradient. Thus, only the light organic elements pass through the bed of lignocellulosic biomass according to the zone (Z3) to continue their race to the zone (Z4) of secondary combustion as it is specified later.

The phenomenon of filtration is possible, because unlike coal, the lignocellulosic biomass does not agglutinate, thus the pressure drop in the heating body remains stable and there is no clogging phenomenon. The lignocellulosic biomass bed according to the zone (Z3) makes it possible to cool the gaseous flow (G2), however, its temperature remains sufficiently high (> 60 ° C) so that the residual tars do not condense at the top of the heating body. The temperature gradient present in the bed of lignocellulosic biomass is followed by the presence of a series of thermocouples installed throughout the heating body. In an optimized manner, the lowest temperature is of the order of 60 to 70 ° C at the top of the biomass bed, while at the level of the primary combustion zone (ZI) and corresponding to the temperature of the combustion biomass burned, it is of the order of 1000 ° C depending on the type of biomass used and its humidity. Level sensors are installed in the upper part of the heating body to ensure the presence of lignocellulosic biomass on a height sufficient for the proper functioning of the burner. In addition, the height of the flow must be sufficient to prevent any fluidization phenomenon.

The fourth zone (Z4), referred to as the secondary combustion zone, is situated at the front and in the lower part of the burner and corresponds with the integration of the secondary circuit (C2) with the mixture of flows (G1) coming from the lower body. heating, flow of combustion gas (G2) from the chamber (4) surrounding the heating body and the flow (G3) of secondary air initiated by the circuit (C2). These three flows are found in the junction zone of the thermal chamber (6) and together allow a secondary combustion effect. This allows the combustion of organic substances carried by the stream (G2).

Thus, according to the invention, the directed meeting of the two air flows (G1-G3) and the flow (G2) of the combustion gas generates the formation of a gas flow exiting in the thermal chamber (6) and then discharged into the heating circuit, having a controlled oxygen content. This control is more particularly allowed by the oxygen content related to the flow (G3) and regulated from the valve (V2) and the measurements made continuously by the oxygen sensor (O2).

Thus, the implementation of these three flows (G1-G2-G3) in combination with the continuous introduction of lignocellulosic biomass, according to the flux (FS), and with the formation of a zone biomass bed (Z3 ) allows the combustion of biomass under conditions of varied grain size, and also to treat biomass products in differentiated states. According to the invention, each of the streams (G1-G2-G3) has a particular function and they meet at a given moment in the zone (Z4) of junction between the heating body and the nozzle to ensure a secondary combustion zone which makes it possible to treat organic substances generated by biomass.

More specifically, the so-called primary combustion flow (Gl) results from the passage of the primary air through the primary combustion zone inside the burner body. This depleted flow of oxygen leaves at the front of the burner. The flow (G2) oriented inside the heating body is a rich flow of organic substances through its passage zones (Z2) and (Z3) of gasification and filtration. This flow (G2) provides a transport function of the organic substances for, through a specific circuit in the burner, to be brought to the front of the burner to a secondary combustion zone. The flow (G3) generating the secondary combustion makes it possible to control the combustion at the meeting point of the three flows (G1-G2-G3) at the front of the burner in the gas combustion zone.

In other words, the invention uses a process for burning lignocellulosic biomass, starting from the implementation of three gas flows, two of air and one of combustible gas and of a solid flow in a structure. specific to a burner arranged to authorize the implementation and the circulation of each of the streams, with zones (ZI) (Z2) (Z3) specific and in particular the zone (Z3) of filtration of the gas stream (G2) then the meeting of the gas flows in a zone (Z4) located at the front of the burner generating secondary combustion with a view to obtaining an outgoing gas whose oxygen content is controlled and allowing a complete treatment of all the especially organic components of biomass. Furthermore, the valve (VI) arranged in the primary circuit (C1) makes it possible to control the quantity of gas introduced into the primary combustion zone in the heating body and consequently it makes it possible to control the final temperature obtained within the outgoing gas stream.

The valve (V2) makes it possible to control the flow (G3) and the quantity of oxygen supplied to the level of the secondary combustion zone and thus to regulate the oxygen content in the gas flow leaving the reactor.

According to the invention, the solid flux (FS) composed of lignocellulosic biomass is fed automatically and continuously, it is furthermore established so as to allow the sealing burner to be closed in its upper part for the flow circulation (G2). . This controlled solid flow is intended to define and regulate the height of the zone (Z3) for filtration of lignocellulosic biomass for the passage of gas (G2).

The burner according to the invention and its method make it possible to equip industrial installations for the generation of combustion gases with a controlled oxygen content.

The advantages are apparent from the invention, and in particular the following points are emphasized:

 - better combustion of biomass and all its components, regardless of particle size;

 control of the residual amount of oxygen in the outgoing gas stream;

- ability to control and adjust the oxygen concentration as needed in the outflow; - ability to operate with a wide range of biomass granulometry;

 - possibility of having a suitable and variable thermal power range;

 - ability to work with a variety of original biomass from forest or agricultural residues;

 - possibility to work with raw or roasted biomass;

- automated management of the outgoing gas flow control.

Claims

R E V E N D I C A T IO N S -1- Lignocellulosic biomass burner, characterized in that it comprises an outer body (1) forming a column arranged internally with on the one hand a portion (la) receiving and filled with lignocellulosic biomass (3) forming a heating body (the ) and around it on a part of its peripheral periphery with a chamber (4) for distributing and circulating a combustible gas (G2), and in that the height of the heating body is less than that of the column, so as to define in the upper part a passage (1b) of circulation of said fuel gas (G2), and in that the supply of the lignocellulosic biomass (3) inside the burner in the receiving part is carried out by a supply means (5) continuously, and in that the burner column opens at its bottom to a thermal chamber (6) and a nozzle of the flame passage, and in that the chamber (4) of distribution and circulation of said fuel gas (G2) around the heating element (la) opens at the bottom of the burner at the junction of the burner with the thermal chamber and the flame passage nozzle, and in that the burner comprises two circuits (C1-C2) of arrival primary and secondary air, for generating three gaseous flows (G1-G2-G3), said gaseous flows being two air flows (G1) (G3) and a fuel gas flow, and circulating inside the burner, and together produce a secondary combustion for the emission of an outgoing gas and allowing the treatment of organic products from biomass, and in that the burner structure defines four specific zones, a zone (ZI) of combustion primary, a zone (Z2) for gasification of the lignocellulosic biomass, a zone (Z3) for filtration, said zones (Z1-Z2-Z3) being located successively in the heating body, and a zone (Z4) of secondary combustion, and in that the zone (Z3) of filtration is defined by a bed of biom Lignocellulosic shell allowing filtration of gas fuel (G2) from the gasification of the lignocellulosic biomass in the gasification zone (Z2), and in that said air flows (G1) (G3) and the fuel gas flow (G2) are directed to the zone (Z4) secondary combustion and flame generation. -2- Burner according to claim 1, characterized in that it comprises two air supply circuits on the one hand primary air, and secondly secondary air, said first circuit (Cl) d primary air comprising a duct (8) with fan (9) opening into the lower part of the heating element at the primary combustion zone part, and in that said duct (8) is arranged in the heating element for the passage of the gaseous air flow (Gl) and feed the primary combustion zone (ZI) present at the bottom of the heating body, and in that the second circuit (C2) of air called secondary air opens into the lower part of the burner at the junction with the arrival of the different gas streams (G1-G2), the second circuit implementing a fan (1 1). Burner according to claim 2, characterized in that the first air circuit (C1) includes a temperature-controlled control valve (VI) measured by a thermocouple (T2) located in the thermal chamber, and in that that the second air circuit (C2) includes a control valve (V2) controlled according to the oxygen content measured with a measuring probe (O2) in the flow leaving the thermal chamber, and in that another Thermocouple (Tl) arranged upstream in the thermal chamber allows another temperature control. Burner according to claim 1 or 2, characterized in that the primary circuit (C1) includes a flow distributor (10) for splitting the air flow (Gl) in two during the primary combustion step. . -5 - Burner according to any one of claims 2 and 4, characterized in that the air flow (G1) at the outlet of the duct (8) is directed for a first portion towards the front of the lower part of the burner to feed the combustion of the lignocellulosic biomass present at the bottom of the heating body, and by a second part intended to rise upwards in the heating body by supplying the energy necessary for the gasification of the biomass by defining a combustible gas ( G2). -6- Burner according to claims 1 and 5, characterized in that the first zone (ZI) said primary combustion is located inside and in the lower part of the heating body, and in that it is in close connection with the circuit (C1) and in that it generates the fluxes (Gl) and (G2), and in that this zone (ZI) serves to burn a part of the biomass contributed by the corresponding flux (FS) the introduction of the biomass inside the column and specifically in the burner heater. Burner according to Claim 1, characterized in that the second zone (Z2), called the gasification zone, is located inside the heating element, just above the primary combustion zone, generating significant volumes of gas rich in organic matter which enrich the flow (G2) during its passage in this zone of the burner. -8- Burner according to claims 1 and 7, characterized in that the zone (Z3) filtration is located inside the heating body above the zone (Z2), this zone (Z3) for filtering the tars (liquid organic materials) contained in the stream (G2), distill and fragment them before reinjecting them through the flow (G2) on the front of the burner to be fully burned. Burner according to Claim 1, characterized in that the fourth zone, referred to as secondary combustion zone, is located at the front and in the lower part of the burner and corresponds with the integration of the secondary circuit (C2) with the mixture of flow (G1) from the bottom of the heating body, the flow (G2) from the chamber (4) surrounding the heating body and the flow (G3) of secondary air initiated by the circuit (C2). Burner according to claim 1, characterized in that the two air streams (G1-G3) and a fuel gas stream (G2) are conveyed according to specific circuits in the junction zone of the thermal chamber and allow together a secondary combustion effect of the organic substances transported by the flow (G2). -1-A method for burning lignocellulosic biomass in a biomass burner, characterized in that it implements the emission and management of three gas streams (G1-G2-G3), two air streams (G1-G2-G3), ) (G3) and a stream of combustible gas (G2) and a solid stream (FS) of biomass, and areas of the burner comprising a primary combustion zone, a gasification zone, a filtration zone and a zone of secondary combustion, and in that the first primary combustion air stream (G1) passes through the primary combustion zone inside the burner body, and in that the second fuel gas stream (G2) passes through the gasification and filtration zones to transport an organic substance from the biomass to the secondary combustion zone and in that the third air stream (G3) generates the secondary combustion, and in that the three gas streams (G1-G2-G3) meet at the front of the burner to define a secondary combustion zone for generating an outgoing gas regulated in temperature and in oxygen content.