Preparation of biomass natural binder based on corn straw, and preparation and application of compound briquette fuel of biomass natural binder and corn straw

Abstract

In order to solve the problems of environmental pollution, resource waste and the like caused by treatment such as low utilization rate of crop straws in China, open-air incineration and the like, the invention aims to provide a method for preparing the natural biomass binder by taking the corn straws as a raw material, and the preparation method comprises the following steps: crushing the corn straws, carrying out alkalization treatment, and carrying out hydrothermal reaction, thereby obtaining the natural biomass binder. And drying to obtain corn straw binder particles. Corn straw from Xinjiang is used for preparing the binder, and the problems that biomass resources are rich, but crop straw is low in utilization rate and low in high-value recycling rate are solved. The binder is low in preparation cost, high in performance and small in environmental load, the binding advantage of corn straw biomass is fully utilized by the binder, and the biomass binder with excellent performance can be prepared. The biomass binder solves the problem of resource shortage to a certain extent, and waste crop biomass such as corn straw is turned into wealth.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of waste biomass treatment, in particular to the preparation of corn straw natural biomass binder and the research of compounded biomass briquette fuel. BACKGROUND

[0002] Biomass charcoal briquette fuel, carbon source, catalytic combustion aid, binder and molding technology, etc. as its important components, plays a crucial role in the combustion and molding performance of briquette fuel. Therefore, we have carried out a lot of research on the mechanism of binder and the preparation method of binder. Biomass briquette fuel is a kind of biomass fuel processed from combustible herbaceous or woody raw materials. After slicing, crushing, screening, mixing, extruding and other processes, it is finally made into shaped environmental protection fuel with high calorific value and complete combustion.

[0003] The binder plays a crucial role in the production process of biomass compounded briquette fuel. The existing binder is mostly coal tar and asphalt, etc. These binders have the disadvantages of high preparation cost and easy to cause secondary pollution in the preparation process.

[0004] Therefore, the present application is proposed. SUMMARY

[0005] The present application aims to provide a preparation method of corn straw biomass binder, which aims to solve the technical problems of high preparation cost and easy to cause secondary pollution in the preparation process of existing binder; and to provide a preparation method of natural binder compounded with biomass briquette fuel, which solves the technical problems of low combustion value, serious environmental pollution and high cost of binder of biomass fuel.

[0006] To solve the above technical problems, the present application adopts the following technical solutions:

[0007] The first aspect of the present application provides a preparation method of corn straw natural biomass binder and its application. The biomass binder is obtained by alkali treatment, hydrothermal treatment, drying and other treatments of corn straw powder.

[0008] Optionally, the particle size of the corn straw powder is 200 mesh.

[0009] Optionally, the alkali treatment is carried out using alkali.

[0010] Preferably, the alkali includes NaOH solution.

[0011] Preferably, the concentration of the NaOH solution is 1.5wt%.

[0012] Preferably, the temperature of the hydrothermal treatment is 80℃.

[0013] Preferably, the hydrothermal treatment is performed for 2 hours.

[0014] Optionally, an alcohol solution is added in the alkalization treatment.

[0015] Preferably, the alcohol solution comprises anhydrous ethanol.

[0016] Optionally, a first drying process after the hydrothermal treatment is further included.

[0017] Preferably, the first drying process is performed at a temperature of 80°C.

[0018] Preferably, the first drying process is performed for 48 hours.

[0019] Preferably, the first crushing process is performed to a particle size of 200 mesh.

[0020] Preferably, the mass ratio of the corn stalk powder, the alcohol solution and the alkali is 5:3:70.

[0021] A second aspect of the present application provides a natural biomass binder prepared from corn stalks according to the preparation method of the first aspect.

[0022] A third aspect of the present application provides an application of the natural biomass binder in a compounded biomass briquette.

[0023] A fourth aspect of the present application provides a compounded biomass briquette, comprising 75%-95% of biomass powder and 5%-25% of biomass binder by mass percentage.

[0024] A fifth aspect of the present application provides a preparation method of the compounded biomass briquette, wherein the biomass powder and the biomass binder are mixed uniformly and then hot-pressed to obtain the compounded briquette.

[0025] Preferably, the biomass powder has a particle size of ≤200 mesh.

[0026] Preferably, the biomass binder has a particle size of ≤200 mesh.

[0027] Preferably, the hot-pressing is performed at a temperature of 100°C.

[0028] Preferably, the hot-pressing is performed at a pressure of 14.1 MPa.

[0029] Preferably, the hot-pressing is performed for 5 minutes.

[0030] Preferably, the combustion treatment is performed for 120 minutes.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] 1.The biomass binder provided by the present application is prepared by using widely-sourced corn stalks, which overcomes the shortcomings of traditional binders, such as limited raw materials, easy environmental pollution and high cost, and has good thermal stability and is a high-quality binder raw material. The corn stalks have high cellulose and lignin contents and exhibit similar properties to woody materials. In the preparation, the corn stalks are first subjected to alkalization treatment to destroy the pyran ring of lignin in the corn stalks and strip the cellulose and hemicellulose that are crosslinked with the lignin, which removes the elasticity of the original stalks and separates the fibers in the stalk raw materials from each other. The preparation method has a simple process flow, a large processing capacity, a reduced preparation cost, no pollution in the preparation process and is suitable for large-scale popularization and use.

[0033] 2.The biomass binder provided by the present application has excellent bonding performance and can be used in different industries and fields, such as the production of biochar fertilizers (preparation of columnar carbon-based slow-release fertilizer and columnar biomass carbon-based urea), compounded biomass fuel, activated carbon, briquette, electrode material and the like.

[0034] 3.The biomass binder provided by the present application is used in the preparation of compounded biomass briquette, which provides a binder with excellent performance for the production process of the compounded biomass briquette, reduces the production cost of the compounded biomass briquette and also reduces the environmental pollution in the production process of the compounded biomass briquette.

[0035] 4.The compounded biomass briquette provided by the present application improves the stability of the compounded biomass briquette through the diffusion of biomass particles from one place to another and the formation of bridge bonds at the contact points. The compounded biomass briquette uses corn stalks as the main raw material to produce the compounded biomass briquette, takes into account the excellent performance of the raw material and realizes the high-value utilization of the corn stalks. The effective utilization of the corn stalks can bring huge economic and social benefits.

[0036] 5.The preparation method of the compounded biomass briquette provided by the present application has a continuous flow and a simple process and is suitable for large-scale industrial production.

[0037] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The preparation flow chart of the corn stalk biomass binder provided for Example 1 is shown in the figure.

[0039] Example 2 provides a compounded biomass molding fuel production process;

[0040] Figure 2 A combustion performance comparison chart is provided for the examples.

Claims

1. Preparation of corn stalk natural biomass binder and application of compounded biomass briquette fuel, characterized in that The corn straw is crushed, alkalinized, hydrothermally treated, etc. to obtain a pre-corn straw biomass binder.

2. The production method according to claim 1, a characterized in that, The alkalinization treatment is performed using an alkali; preferably, the alkali comprises a NaOH solution; Preferably, the concentration of the NaOH solution is 1.5wt%.

3. The production method according to claim 1, characterized by, The temperature of the hydrothermal treatment is 80℃; preferably, the time of the hydrothermal treatment is 2h.

4. The preparation method according to claim 1, characterized in that, An alcohol solution is added in the alkalinization treatment; Preferably, the alcohol solution comprises anhydrous ethanol.

5. The preparation method according to claim 1, characterized in that, A first drying after the hydrothermal treatment and a crushing process are further included. Preferably, the temperature of the first drying is 80℃. Preferably, the time of the first drying is 48h. Preferably, the particle size of the first crushing is 200 mesh.

6. The preparation method according to claim 4, characterized in that, The mass ratio of the corn straw powder, the alcohol solution and the alkali is 5:3:

70.

7. A biomass binder, characterized by, Prepared according to the preparation method of any one of claims 1-6.

8. The use of the biomass binder of claim 7 in a compounded briquette fuel.

9. A compound shaped fuel, characterized by, The compounded briquette fuel comprises, by mass percentage, 5%, 10%, 15%, 20%, 25% of the biomass binder particles, 75%, 80%, 85%, 90%, 95% of the biomass powder; wherein the biomass binder is the binder of claim 7 or prepared according to the preparation method of any one of claims 1-6.

10. The method of claim 9, wherein the method further comprises the step of: The biomass powder and the biomass binder are mixed uniformly and then hot-pressed to obtain the compounded briquette fuel; Preferably, the temperature of the hot-pressing is 100℃. Preferably, the pressure of the hot-pressing is 14.1MPa. Preferably, the pressure holding time of the hot-pressing is 5min.

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