Device and method for promoting demineralization forming of biomass coke by using biomass pyrolysis primary oil

Abstract

The invention provides a device and a method for promoting demineralization forming of biomass coke by using biomass pyrolysis primary oil, and the method comprises the following steps: (1) sequentially drying and crushing a biomass raw material to obtain pretreated biomass; (2) carrying out pyrolysis treatment on the pretreated biomass to obtain pyrolysis primary oil and biomass coke; (3) performing layering treatment on the pyrolysis primary oil to obtain a light oil water solution and heavy oil; mixing the light oil-water solution and the biomass coke, and carrying out demineralization treatment on the biomass coke to obtain demineralized biomass coke; and (4) mixing the demineralized biomass coke and heavy oil, and carrying out molding treatment to obtain a biomass coke molded product. According to the method, the layering characteristic of the biomass pyrolysis primary oil is utilized, the light oil water solution and the heavy oil obtained through layering treatment are reasonably utilized, efficient demineralization and forming of the biomass coke are achieved, and the overall application effect and economical efficiency of the biomass pyrolysis technology are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of biomass processing, and particularly relates to a device and method for promoting the briquetting of biomass pyrolysis primary oil. BACKGROUND

[0002] Biomass pyrolysis technology is a thermochemical conversion method that converts biomass into gaseous, liquid and solid products under anaerobic or hypoxic conditions through heating. Depending on the conditions such as pyrolysis temperature, pressure and residence time, biomass pyrolysis can produce products with different proportions and characteristics. Generally speaking, the pyrolysis process mainly includes the following stages: first, the drying stage, in which the water in the biomass is removed; then, the pyrolysis stage, in which the biomass undergoes chemical decomposition to produce various gaseous, liquid and solid products; finally, the product cooling and collection stage. Pyrolysis technology is considered one of the important ways for the utilization of biomass energy because it can operate at relatively low temperatures and can flexibly adjust the product ratio.

[0003] The bio-oil produced in the biomass pyrolysis process has the characteristics of instability and easy stratification. Bio-oil is usually composed of various organic compounds, including acids, alcohols, phenols, aldehydes, etc. These compounds have large differences in physical and chemical properties, which leads to the stratification of bio-oil during storage and transportation.

[0004] CN117551468A discloses a method for preparing briquetted fuel carbon and co-producing biomass oil and fuel gas by catalytic pyrolysis of biomass. The process steps include: (1) crushing and grinding the biomass to obtain uniform particle samples; (2) mixing the catalyst and the sample, then drying, pyrolyzing and coking in a reactor; (3) collecting the solid carbon, adding dilute hydrochloric acid, washing with deionized water and adding a binder, then sending it to a briquetting device for pressing and forming, and finally solidifying and drying to obtain briquetted fuel carbon; (4) extracting the liquid product collected by the condensing device with dichloromethane to remove the upper aqueous phase and obtain biomass oil, and collecting the gaseous product through the aluminum foil gas bag at the tail end of the reaction device. The briquetted fuel carbon is prepared by the process steps of pyrolysis, coking and pressing, and the co-production of biomass oil and fuel gas is realized, which is simple to operate, low in production cost and realizes the full resource utilization of biomass.

[0005] CN102676189A discloses a method for producing charcoal from pyrolyzed biomass. The method involves crushing biomass material, mixing it with pulverized coal, and drying it. After charring, the material is fed into the inlet of a circular rotary furnace, and metallurgical flue gas is introduced through the outlet of the furnace. The furnace rotates in the opposite direction to the direction of the metallurgical flue gas. The metallurgical flue gas and biomass undergo countercurrent contact heat exchange. The high-temperature flue gas waste heat is used to heat, dry, and pyrolyze the charcoal into biomass charcoal and pyrolysis gas. The pyrolysis gas and tar are condensed into non-condensable gas and tar through heat exchange. The tar is collected and utilized, and the non-condensable gas is purified and discharged for reuse.

[0006] CN104449860A discloses a solar heat collection pretreatment and gasification tar comprehensive utilization process for biomass pressing and its device, which is characterized by including the following steps: using a biomass solar gasification device and a biomass solar pretreatment softening and curing molding device to pyrolyze and gasify the biomass to produce gas, tar, and preheat and cure the biomass to form briquette. First, focusing sunlight to collect heat, transferring heat to the biomass gasification device, pyrolyzing and gasifying the biomass after reaching the gasification temperature, and purifying, condensing, and compressing the generated gas to form a combustible gas. At the same time, the tar produced as a byproduct of gasification can be added to the biomass solar pretreatment softening and curing molding device as a binder for briquette production; second, transferring heat to the biomass curing molding device to pretreat the biomass, soften the lignin in the biomass, and then press the biomass into biomass briquette, realizing the coupling of the biomass solar curing molding and gasification process.

[0007] However, the above methods still have problems such as complex process, high cost, and environmental unfriendliness, which limit their large-scale application. Summary of the Invention

[0008] In view of the problems existing in the prior art, the present invention provides a device and method for promoting the demineralization and molding of biomass coke by using biomass pyrolysis primary oil. By utilizing the stratification characteristics of biomass pyrolysis primary oil, the light oil-water solution and heavy oil obtained by the stratification treatment are rationally utilized to achieve efficient demineralization and molding of biomass coke, overcoming the shortcomings of traditional biomass coke performance control technology such as complexity, high cost and limited effect, and improving the overall application effect and economy of biomass pyrolysis technology.

[0009] To achieve this object, the present invention adopts the following technical solutions:

[0010] In a first aspect, the present invention provides a method for promoting the demineralization and forming of biomass char by pyrolysis of biomass primary oil, the method comprising the following steps:

[0011] (1) The biomass raw material is dried and crushed in sequence to obtain pretreated biomass;

[0012] (2) the pretreated biomass is subjected to pyrolysis treatment to obtain pyrolysis primary oil and biomass char;

[0013] (3) the pyrolysis primary oil is subjected to layering treatment to obtain light oil aqueous solution and heavy oil; the light oil aqueous solution and the biomass char are mixed to perform demineralization treatment on the biomass char to obtain demineralized biomass char;

[0014] (4) the demineralized biomass char and the heavy oil are mixed to perform molding treatment to obtain biomass char molded product.

[0015] The method for promoting demineralization and molding of biomass char by using pyrolysis primary oil according to the application makes full use of the light oil aqueous solution and the heavy oil obtained by layering treatment of the pyrolysis primary oil, wherein the upper layer of the light oil aqueous solution is mixed with the biomass char to perform elution of alkali metals in the biomass char, so as to improve the purity and performance of the final biomass char molded product; and then the lower layer of the heavy oil with high viscosity and hydrophobicity is used as a binder to perform molding treatment on the demineralized biomass char, so as to regulate the porosity and strength of the biomass char and obtain a biomass char molded product meeting the requirements of industrial application. The method according to the application not only solves the problem that the layering characteristics of the pyrolysis primary oil are not fully utilized, but also overcomes the deficiencies of traditional performance regulation techniques for biomass char, such as complexity, high cost and limited effect, so as to realize precise regulation of the performance of the biomass char and improve the overall application effect and economy of the biomass pyrolysis technology.

[0016] The light oil aqueous solution obtained by layering treatment of the pyrolysis primary oil can also be further processed and utilized as a chemical raw material; and the heavy oil can also be mixed with other substances to prepare a high-value-added bio-composite material. Through efficient utilization of the layering products, the economy and resource utilization rate of the whole process are improved. The density of the light oil aqueous solution and the heavy oil is not specifically limited in the application, and the light oil aqueous solution is in the upper layer after layering treatment, and the heavy oil is in the lower layer.

[0017] Preferably, the moisture content of the pretreated biomass in step (1) is 10% to 20%, for example, 10%, 12.5%, 14.8%, 16.2%, 18.6% or 20%, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0018] Preferably, the particle size of the pretreated biomass is 0.1 to 5 mm, for example, 0.1 mm, 0.5 mm, 1.2 mm, 2.3 mm, 3.8 mm or 5 mm, but is not limited to the listed values, and other values not listed in the range are also applicable.

[0019] Preferably, the temperature of the pyrolysis treatment of step (2) is in the range of 400-700℃, such as 400℃, 450℃, 500℃, 550℃, 650℃ or 700℃, but not limited to the listed values, other values not listed in this range are also applicable.

[0020] Preferably, the residence time of the pyrolysis treatment is in the range of 10-30min, such as 10min, 12min, 15min, 18min, 25min or 30min, but not limited to the listed values, other values not listed in this range are also applicable.

[0021] The temperature of the pyrolysis treatment and the residence time of the pyrolysis treatment are preferred in the present application, which optimizes the biomass pyrolysis process and ensures the layering effect of the pyrolysis primary oil and the performance of the biomass char. These pyrolysis parameters can adapt to different types of biomass raw materials, improving the flexibility and efficiency of the entire system.

[0022] Preferably, the method of the layering treatment of step (3) includes standing, centrifugation or layering after mixing with a liquid.

[0023] The method of layering after mixing with a liquid is preferred in the present application, which can improve the layering efficiency and enable the upper layer of the acidic light oil aqueous solution and the lower layer of the high-viscosity hydrophobic heavy oil to be quickly separated, providing conditions for subsequent demineralization and molding.

[0024] Preferably, the liquid includes water or a surfactant.

[0025] Preferably, the surfactant includes any one or a combination of at least two of an anionic surfactant sodium dodecyl benzene sulfonate, a non-ionic surfactant polysorbate-20 or a non-ionic surfactant alkyl glycoside, wherein a typical but non-limiting combination includes a combination of the anionic surfactant sodium dodecyl benzene sulfonate and the non-ionic surfactant polysorbate-20, a combination of the non-ionic surfactant alkyl glycoside and the anionic surfactant sodium dodecyl benzene sulfonate or a combination of the non-ionic surfactant polysorbate-20 and the non-ionic surfactant alkyl glycoside.

[0026] Preferably, the method of the biomass char demineralization treatment of step (3) includes water washing or sieving.

[0027] Preferably, the liquid-solid ratio of the light oil aqueous solution and the biomass char in the biomass char demineralization treatment is in the range of 1:1-5:1, such as 1:1, 2:1, 3:1, 3.5:1, 4.2:1 or 5:1, but not limited to the listed values, other values not listed in this range are also applicable.

[0028] Preferably, the mass ratio of the demineralized biomass char and the heavy oil in the molding process of step (4) is 1:0.5-1:1, such as 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.9 or 1:1, etc., but not limited to the listed values, and other values not listed in the range are also applicable.

[0029] Preferably, a filler is also added in the molding process to further improve the molding effect and mechanical strength of the biomass char, meeting the needs of different industrial scenarios.

[0030] Preferably, the filler includes acetone and / or ethanol.

[0031] Preferably, the amount of the filler added is 18-22 wt.% of the mass of the demineralized biomass char, such as 18 wt.%, 18.5 wt.%, 19.2 wt.%, 20.1 wt.%, 21.4 wt.% or 22 wt.%, etc., but not limited to the listed values, and other values not listed in the range are also applicable.

[0032] Preferably, the temperature of the molding process of step (4) is 50-150℃, such as 50℃, 65℃, 80℃, 100℃, 120℃ or 150℃, etc., but not limited to the listed values, and other values not listed in the range are also applicable.

[0033] Preferably, the pressure of the molding process is 1-10 MPa, such as 1 MPa, 2.5 MPa, 4 MPa, 6 MPa, 8 MPa or 10 MPa, etc., but not limited to the listed values, and other values not listed in the range are also applicable.

[0034] Preferably, the time of the molding process is 1-10 min, such as 1 min, 2 min, 3 min, 5 min, 8 min or 10 min, etc., but not limited to the listed values, and other values not listed in the range are also applicable.

[0035] As a preferred technical solution of the present application, the method comprises the following steps:

[0036] (1) The biomass raw material is sequentially subjected to drying treatment and crushing treatment to obtain pretreated biomass with a water content of 10%-20% and a particle size of 0.1-5 mm;

[0037] (2) The pretreated biomass is subjected to pyrolysis treatment at a temperature of 400-700℃ and a residence time of 10-30 min to obtain initial pyrolysis oil and biomass char;

[0038] (3) the pyrolysis primary oil is subjected to a layering treatment to obtain a light oil aqueous solution and a heavy oil; the light oil aqueous solution and the biomass char are mixed according to a liquid-solid ratio of 1:1-5:1 to perform a biomass char demineralization treatment to obtain a demineralized biomass char;

[0039] The layering treatment method comprises standing, centrifugation or layering after mixing with a liquid; the liquid comprises water or a surfactant; the surfactant comprises any one or a combination of at least two of an anionic surfactant sodium dodecyl benzene sulfonate, a non-ionic surfactant polysorbate-20 or a non-ionic surfactant alkyl glycoside; the biomass char demineralization treatment method comprises water washing or sieving;

[0040] (4) the demineralized biomass char and the heavy oil are mixed according to a mass ratio of 1:0.5-1:1 to perform a molding treatment at a temperature of 50-150 DEG C and a pressure of 1-10 MPa for 1-10 min to obtain a biomass char molded product;

[0041] A filler is further added in the molding treatment; the filler comprises acetone and / or ethanol; the filler is added in an amount of 18-22 wt.% of the mass of the demineralized biomass char.

[0042] In a second aspect, the present application further provides a device for promoting demineralization and molding of biomass char by using pyrolysis primary oil, which is used to perform the method for promoting demineralization and molding of biomass char by using pyrolysis primary oil according to the first aspect;

[0043] The device comprises a biomass drying device, a biomass crushing device, a pyrolysis furnace, a solid-liquid separation device, a pyrolysis primary oil layering device, an acid washing device and a granulation device;

[0044] The biomass drying device, the biomass crushing device, the pyrolysis furnace and the solid-liquid separation device are sequentially connected;

[0045] The solid-liquid separation device is connected with the pyrolysis primary oil layering device and the acid washing device respectively;

[0046] The pyrolysis primary oil layering device and the acid washing device are both connected with the granulation device.

[0047] The device for promoting demineralization and molding of biomass char by using pyrolysis primary oil provided by the present application has a reasonable design and can be applied to various types of biomass raw materials, such as wood and herbs. By adjusting the pyrolysis treatment process parameters and the molding treatment process parameters, biomass char products meeting different industrial requirements can be produced, which has strong adaptability and flexibility, provides a new idea and method for the development of biomass pyrolysis technology and helps to improve the utilization efficiency and economy of biomass energy.

[0048] The upper layer light oil aqueous solution obtained by the layered treatment of the pyrolysis primary oil is acidic as shown by pH measurement, and the light oil aqueous solution and the biomass char are mixed in an acid washing device for the demineralization treatment of the biomass char.

[0049] Preferably, the solid-liquid separation device comprises a cyclone separator.

[0050] Compared with the prior art, the present application has at least the following beneficial effects:

[0051] (1) The method for promoting the demineralization and molding of biomass char provided by the present application fully utilizes the layered characteristics of the pyrolysis primary oil generated after the pyrolysis of biomass, uses the upper layer acidic light oil aqueous solution for demineralization, and uses the lower layer high-viscosity hydrophobic heavy oil for molding, thereby realizing the maximum utilization of resources, improving the economic benefits of the entire process, reducing the discharge of waste, and conforming to the concept of sustainable development.

[0052] (2) The demineralized biomass char obtained by the method for promoting the demineralization and molding of biomass char provided by the present application has a low alkali metal content, thereby reducing the corrosion and slagging problems of equipment in combustion or industrial applications; and the final biomass char molding product has a uniform pore structure and high mechanical strength, and has better reactivity and heat value utilization rate in the combustion process.

[0053] (3) The method for promoting the demineralization and molding of biomass char provided by the present application has a simple process flow, low equipment investment, and low operating cost; the layered products of the pyrolysis primary oil are used for demineralization and molding, thereby avoiding the use of additional chemical reagents and complex physical treatment processes, and further reducing the production cost.

[0054] (4) The method for promoting the demineralization and molding of biomass char provided by the present application improves the quality of the biomass char molding product while reducing the emission of pollutants in the pyrolysis process; the demineralization treatment of the biomass char removes harmful impurities in the biochar, thereby reducing the generation of pollutants such as sulfur dioxide and nitrogen oxides in the combustion process; the entire process pays attention to environmental protection and has less impact on the environment, thereby having good environmental benefits. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 is a device structure schematic diagram of the method for promoting the demineralization and molding of biomass char in Example 1 of the present application.

[0056] In the figure: 1-biomass raw material; 2-biomass drying device; 3-biomass crushing device; 4-pyrolysis furnace; 5-solid-liquid separation device; 6-pyrolysis primary oil layering device; 7-acid washing device; 8-pelletizing device; 9-transportation device. DETAILED DESCRIPTION

[0057] The technical solutions of the present application are further illustrated in the following with reference to the accompanying drawings and through specific embodiments.

[0058] The present application is further described in detail below. However, the examples described below are merely simple examples of the present application and do not represent or limit the protection scope of the present application, and the protection scope of the present application is subject to the claims.

[0059] Embodiment 1

[0060] The present embodiment provides a device for promoting the briquetting of biomass char by biomass pyrolysis primary oil, and a structural schematic diagram thereof is shown in Figure 1 . Figure 1 1 represents a biomass raw material.

[0061] The device comprises a biomass drying device 2, a biomass crushing device 3, a pyrolysis furnace 4, a solid-liquid separation device 5, a pyrolysis primary oil layering device 6, an acid washing device 7, and a granulation device 8;

[0062] The biomass drying device 2, the biomass crushing device 3, the pyrolysis furnace 4, and the solid-liquid separation device 5 are connected in sequence.

[0063] The solid-liquid separation device 5 is connected with the pyrolysis primary oil layering device 6 and the acid washing device 7, respectively.

[0064] The pyrolysis primary oil layering device 6 and the acid washing device 7 are both connected with the granulation device 8; and the granulation device 8 is connected with a transportation device 9.

[0065] The solid-liquid separation device 5 is a cyclone separator.

[0066] Embodiment 2

[0067] The present embodiment provides a method for promoting the briquetting of biomass char by biomass pyrolysis primary oil, and the method is performed by using the device described in Embodiment 1; the method comprises the following steps:

[0068] (1) The biomass raw material is subjected to drying treatment and crushing treatment in sequence to obtain pretreated biomass with a water content of 15% and a particle size of 2 mm;

[0069] (2) The pretreated biomass is subjected to pyrolysis treatment at a temperature of 500°C and a residence time of 20 min to obtain pyrolysis primary oil and biomass char;

[0070] (3) The pyrolysis primary oil is subjected to layering treatment to obtain light oil aqueous solution and heavy oil; the light oil aqueous solution and the biomass char are mixed according to a liquid-solid ratio of 3:1 to perform biomass char demineralization treatment to obtain demineralized biomass char;

[0071] The method of the layering treatment is layering after mixing with an anionic surfactant sodium dodecyl benzene sulfonate; the method of the demineralization treatment of the biomass char is water washing;

[0072] (4) mixing the demineralized biomass char and the heavy oil at a mass ratio of 1:0.8, and performing a molding treatment at a temperature of 100°C and a pressure of 5 MPa for 8 min to obtain a biomass char molding product;

[0073] The molding treatment further includes adding a filler, acetone; the amount of the filler, acetone, added is 20 wt.% of the mass of the demineralized biomass char.

[0074] Under the conditions of the molding treatment in step (4) of the present embodiment, a biomass char molding product with a porosity of 15.2% and a mechanical strength of 3.1 MPa can be obtained.

[0075] Example 3

[0076] The present embodiment provides a method for promoting the demineralization molding of biomass pyrolysis primary oil, which is performed using the device described in Example 1; the method includes the following steps:

[0077] (1) sequentially performing drying treatment and crushing treatment on the biomass raw material to obtain pretreated biomass with a water content of 10% and a particle size of 5 mm;

[0078] (2) performing pyrolysis treatment on the pretreated biomass at a temperature of 700°C and a residence time of 10 min to obtain pyrolysis primary oil and biomass char;

[0079] (3) performing layering treatment on the pyrolysis primary oil to obtain light oil aqueous solution and heavy oil; mixing the light oil aqueous solution and the biomass char at a liquid-solid ratio of 5:1 to perform demineralization treatment of the biomass char to obtain demineralized biomass char;

[0080] The method of the layering treatment is centrifugation; the method of the demineralization treatment of the biomass char is screening;

[0081] (4) mixing the demineralized biomass char and the heavy oil at a mass ratio of 1:0.5, and performing a molding treatment at a temperature of 150°C and a pressure of 1 MPa for 10 min to obtain a biomass char molding product;

[0082] The molding treatment further includes adding a filler, ethanol; the amount of the filler, ethanol, added is 18 wt.% of the mass of the demineralized biomass char.

[0083] Under the conditions of the molding treatment in step (4) of the present embodiment, a biomass char molding product with a porosity of 20.5% and a mechanical strength of 2.8 MPa can be obtained.

[0084] Example 4

[0085] The present embodiment provides a method for promoting the briquetting of biomass char by using pyrolysis primary oil, which is carried out by using the device described in Embodiment 1. The method comprises the following steps:

[0086] (1) The biomass raw material is subjected to drying treatment and crushing treatment in sequence to obtain pretreated biomass with a water content of 20% and a particle size of 0.1 mm;

[0087] (2) The pretreated biomass is subjected to pyrolysis treatment at a temperature of 400°C and a residence time of 30 min to obtain pyrolysis primary oil and biomass char;

[0088] (3) The pyrolysis primary oil is subjected to layering treatment to obtain light oil aqueous solution and heavy oil; the light oil aqueous solution and the biomass char are mixed at a liquid-solid ratio of 1:1 to carry out biomass char demineralization treatment to obtain demineralized biomass char;

[0089] The layering treatment method is layering after mixing with nonionic surfactant polysorbate-20; the biomass char demineralization treatment method is water washing;

[0090] (4) The demineralized biomass char and the heavy oil are mixed at a mass ratio of 1:1 to carry out briquetting treatment at a temperature of 50°C and a pressure of 1 MPa for 1 min to obtain biomass char briquettes;

[0091] A filler is further added in the briquetting treatment; the filler comprises acetone and / or ethanol; the addition amount of the filler is 22 wt.% of the mass of the demineralized biomass char.

[0092] Under the conditions of the briquetting treatment in step (4) of the present embodiment, biomass char briquettes with a porosity of 10.3% and a mechanical strength of 3.5 MPa can be obtained.

[0093] Embodiment 5

[0094] The present embodiment provides a method for promoting the briquetting of biomass char by using pyrolysis primary oil, which is the same as Embodiment 2 except that the temperature of the pyrolysis treatment in step (2) is 300°C.

[0095] Embodiment 6

[0096] The present embodiment provides a method for promoting the briquetting of biomass char by using pyrolysis primary oil, which is the same as Embodiment 2 except that the temperature of the pyrolysis treatment in step (2) is 800°C.

[0097] As can be seen from the combination of Embodiment 2 and Embodiments 5-6, the pyrolysis of the biomass in Embodiment 5 is incomplete due to the low temperature of the pyrolysis treatment, and the biomass char has a low calorific value and a less developed pore structure. Therefore, the porosity of the biomass char formed product obtained finally is only 8%, the combustion calorific value is low, and the reactivity of the formed product is poor, which is not suitable for industrial scenarios requiring a high calorific value and reactivity; the pyrolysis of the biomass in Embodiment 6 is complete due to the high temperature of the pyrolysis treatment, and the pore structure of the biomass char is too developed, and the mechanical strength of the biomass char is significantly reduced. Therefore, the porosity of the biomass char formed product obtained finally is as high as 25%, but the mechanical strength is only 2 MPa. The formed product is prone to breakage during transportation and use, and the energy consumption is high during the forming process, and the economy is poor.

[0098] Embodiment 7

[0099] The present embodiment provides a method for promoting the demineralization and forming of biomass char by using biomass pyrolysis primary oil. The method is the same as Embodiment 2 except that the mass ratio of the demineralized biomass char to heavy oil in the forming treatment in step (4) is 1:2.

[0100] Embodiment 8

[0101] The present embodiment provides a method for promoting the demineralization and forming of biomass char by using biomass pyrolysis primary oil. The method is the same as Embodiment 2 except that the mass ratio of the demineralized biomass char to heavy oil in the forming treatment in step (4) is 1:0.2.

[0102] As can be seen from the combination of Embodiment 2 and Embodiments 7-8, the mass ratio of the demineralized biomass char to heavy oil in the forming treatment in Embodiment 7 is low, which reduces the porosity of the biomass char formed product, and the porosity of the formed product is only 8%, which may affect the combustion performance of the formed product because too much binder will reduce the air permeability and combustion efficiency of the formed product; the mass ratio of the demineralized biomass char to heavy oil in the forming treatment in Embodiment 8 is high, which reduces the adhesion of the biomass char formed product, and the mechanical strength of the formed product is only 1 MPa, the mechanical strength is reduced, the structure of the formed product is loose, and the formed product is prone to breakage during transportation and use, which affects the actual application effect.

[0103] In summary, the method for promoting the demineralization and forming of biomass char by using biomass pyrolysis primary oil provided by the present application fully utilizes the stratification characteristics of the biomass pyrolysis primary oil produced after the pyrolysis of the biomass, uses the upper layer of the acidic light oil aqueous solution for demineralization, and uses the lower layer of the high-viscosity hydrophobic heavy oil for forming, which realizes the maximum utilization of resources, improves the economic benefits of the entire process, reduces the production cost, reduces the generation of pollutants such as sulfur dioxide and nitrogen oxides in the combustion process, and has good environmental benefits.

[0104] The applicant states that the above description is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and it should be understood by those skilled in the art that any changes or replacements within the technical scope disclosed by the present application can be easily thought out by those skilled in the art, and all of them fall within the protection scope and disclosure scope of the present application.

Claims

1. A method for promoting biomass pyrolysis primary oil to promote biomass char demineralization and molding, characterized in that: The method comprises the following steps: (1) The biomass raw material is dried and crushed in sequence to obtain pretreated biomass; (2) the pretreated biomass is subjected to pyrolysis treatment to obtain pyrolysis oil and biomass char; (3) The pyrolysis primary oil is subjected to a layered treatment to obtain a light oil-water solution and a heavy oil; the light oil-water solution is mixed with the biomass coke, and the biomass coke is subjected to a demineralization treatment to obtain demineralized biomass coke; (4) Mixing the demineralized biomass coke and the heavy oil and performing molding treatment to obtain a biomass coke molded product.

2. The method according to claim 1, characterized in that The moisture content of the biomass after the pretreatment in step (1) is 10% to 20%; Preferably, the particle size of the pretreated biomass is 0.1 to 5 mm.

3. The method according to claim 1 or 2, characterized in that The temperature of the pyrolysis treatment in step (2) is 400-700° C.; Preferably, the residence time of the pyrolysis treatment is 10 to 30 minutes.

4. The method according to any one of claims 1 to 3, characterized in that The method of the stratification treatment in step (3) includes standing, centrifuging or mixing with a liquid and then stratifying; Preferably, the liquid comprises water or a surfactant; Preferably, the surfactant comprises any one of anionic surfactant sodium dodecylbenzene sulfonate, nonionic surfactant polysorbate-20 or nonionic surfactant alkyl polyglycoside, or a combination of at least two thereof.

5. The method according to any one of claims 1 to 4, characterized in that The method for demineralization of biomass char in step (3) includes water washing or screening; Preferably, the liquid-to-solid ratio of the light oil aqueous solution to the biomass coke in the biomass coke demineralization treatment is 1:1 to 5:

1.

6. The method according to any one of claims 1 to 5, characterized in that In the molding process of step (4), the mass ratio of the demineralized biomass coke to the heavy oil is 1:0.5 to 1:1; Preferably, a filler is also added during the molding process; Preferably, the filler comprises acetone and / or ethanol; Preferably, the amount of the filler added is 18 to 22 wt.% of the mass of the demineralized biomass char.

7. The method according to any one of claims 1 to 6, characterized in that The temperature of the molding treatment in step (4) is 50-150° C.; Preferably, the pressure of the molding process is 1 to 10 MPa; Preferably, the molding process takes 1 to 10 minutes.

8. The method according to any one of claims 1 to 7, characterized in that The method comprises the following steps: (1) The biomass raw material is dried and crushed in sequence to obtain pretreated biomass with a moisture content of 10% to 20% and a particle size of 0.1 to 5 mm; (2) the pretreated biomass is subjected to pyrolysis treatment at a temperature of 400-700° C. and a residence time of 10-30 min to obtain pyrolysis oil and biomass char; (3) The pyrolysis primary oil is subjected to layering treatment to obtain a light oil-water solution and a heavy oil; the light oil-water solution and the biomass coke are mixed at a liquid-to-solid ratio of 1:1 to 5:1, and the biomass coke is demineralized to obtain demineralized biomass coke; The method of the layering treatment includes standing, centrifuging or mixing with liquid and then layering; The liquid includes water or a surfactant; the surfactant includes any one of an anionic surfactant sodium dodecylbenzene sulfonate, a nonionic surfactant polysorbate-20, or a nonionic surfactant alkyl polyglycoside, or a combination of at least two thereof; the biomass char demineralization treatment method includes water washing or screening; (4) mixing the demineralized biomass coke and the heavy oil in a mass ratio of 1:0.5 to 1:1 and subjecting the mixture to a molding process at a temperature of 50 to 150° C. and a pressure of 1 to 10 MPa for 1 to 10 minutes to obtain a biomass coke molded product; A filler is also added during the molding process; the filler includes acetone and / or ethanol; and the amount of the filler added is 18 to 22 wt.% of the mass of the demineralized biomass coke.

9. A device for promoting the demineralization and forming of biomass char by using biomass pyrolysis primary oil, characterized in that: The device is used to carry out the method for promoting biomass char demineralization and forming by pyrolysis of biomass primary oil according to any one of claims 1 to 8; The device includes a biomass drying device, a biomass crushing device, a pyrolysis furnace, a solid-liquid separation device, a pyrolysis primary oil separation device, a pickling device and a granulation device; The biomass drying device, biomass crushing device, pyrolysis furnace and solid-liquid separation device are connected in sequence; The solid-liquid separation device is connected to the pyrolysis primary oil stratification device and the pickling device respectively; The pyrolysis primary oil stratification device and the pickling device are both connected to the granulation device.

10. The device according to claim 9, characterized in that The solid-liquid separation device includes a cyclone separator.

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