Biomass fuel sourced from urban life manure residues and preparation method and application thereof

Abstract

The invention provides biomass fuel sourced from urban life manure residues and a preparation method and application thereof, and relates to the technical field of biomass fuel. The preparation method provided by the invention comprises the following steps: carrying out solid-liquid separation on municipal domestic manure residues and manure, and then turning and mixing the municipal domestic manure residues and manure with biomass particles to obtain a dried raw material with the water content of 8-12%; extruding and granulating the dried raw material to obtain the biomass fuel; wherein the biomass material of the biomass particles comprises one of saw dust and rice husk. According to the invention, the utilization efficiency of biomass energy can be effectively improved through resource utilization of urban living manure residues, and meanwhile, the water content and combustion performance can be effectively adjusted by mixing the manure with biomass particles.

Description

Technical Field

[0001] The present invention relates to the technical field of biomass fuels, and in particular to a biomass fuel derived from urban domestic feces and excrement, and a preparation method and application thereof. Background Art

[0002] Feces in residential areas initially settle in septic tanks, forming a water-containing solid residue. Large amounts of this residue are haphazardly dumped into farmland ditches by unprofessional removal teams, or fed into municipal sewage systems into sewage treatment plants. Approximately 57% of urban sewage treatment plants receive a significant portion of their organic load, which is directly discharged into septic tanks. This severely impacts wastewater treatment efficiency and plant operations. Direct agricultural use of this residue carries significant pollution risks: Inadequately disinfected feces carry pathogenic microorganisms (such as E. coli and parasite eggs), heavy metals (such as zinc and cadmium from household detergents), and drug residues (antibiotics and anti-inflammatory drugs), posing a potential threat to soil health and crop safety. A survey in Guangzhou revealed that soil Ascaris eggs were detected in 42% of vegetable fields surrounding the city due to irrigation with feces, far exceeding safety standards. Therefore, there remains an urgent need for resourceful utilization of urban feces. Summary of the Invention

[0003] The purpose of the present invention is to provide a biomass fuel derived from urban domestic feces and excrement, as well as a preparation method and application thereof. By utilizing urban domestic feces and excrement as resources, the utilization efficiency of biomass energy can be effectively improved. At the same time, mixing feces with biomass particles can effectively adjust the moisture content and combustion performance.

[0004] In a first aspect, the present invention provides a method for preparing biomass fuel derived from urban domestic waste and excrement, comprising: performing solid-liquid separation on urban domestic waste and excrement to obtain dry raw materials; mixing the dry raw materials with biomass pellets to obtain dried raw materials; and extruding and granulating the dried raw materials to obtain biomass fuel.

[0005] Optionally, the moisture content of the dried raw material is 8%-12%.

[0006] Optionally, the mass mixing ratio of the dry raw material to the biomass particles is 1:(0.3-0.5).

[0007] Optionally, the biomass material in the biomass particles includes at least one of wood sawdust and rice husk.

[0008] Optionally, the biomass particles have a particle size of 0.5 mm to 5 mm.

[0009] Optionally, urban domestic feces and excrement are separated in advance to remove paper and plastic.

[0010] In a second aspect, the present invention also provides a biomass fuel produced by any of the above optional preparation methods.

[0011] In a third aspect, the present invention further provides an application of biomass fuel produced by any of the above optional preparation methods. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with ordinary skills in the field to which the present invention belongs.

[0013] The present invention provides a method for preparing biomass fuel derived from urban domestic feces, comprising the following steps: S1, performing solid-liquid separation on urban domestic feces to obtain dry raw materials; S2, mixing the dried raw material with the biomass particles to obtain a dried raw material; S3. Extruding and granulating the dried raw materials to obtain biomass fuel.

[0014] In fact, by performing solid-liquid separation on urban domestic feces in step S1, the moisture therein can be removed, thereby obtaining organic waste with a low water content as a dry raw material, which is beneficial to improving its combustion performance and reducing odor. At the same time, in step S2, the dry raw material is turned and mixed using biomass pellets, which not only improves the mixing uniformity of the biomass pellets and the dry raw material, but also can use the biomass pellets to further adjust the moisture content of the dry raw material, and then in step S3, extrusion granulation can be used to directly obtain granular biomass fuel.

[0015] In practice, in step S1, feces and sludge can be directly recovered from centralized feces collection points in the city and subjected to solid-liquid separation through conventional means, such as through grid filtration, to reduce the moisture content in the feces, thereby directly obtaining organic waste as a dry raw material. In some embodiments, step S1 can be performed at a centralized feces collection point, and the resulting solids after solid-liquid separation are shaped to obtain feces and sludge bricks, thereby facilitating centralized collection and transportation.

[0016] Specifically, in step S2, the dried raw material and biomass pellets can be tossed and mixed in a tossing device, thereby effectively improving the mixing uniformity of the two raw materials. At the same time, the tossing effect can further reduce the moisture content of the dried raw material. In addition, the biomass pellets can further absorb moisture from the dried raw material through their own adsorption, thereby facilitating the adjustment of the overall moisture content of the dried raw material. Furthermore, the moisture content of the dried raw material is 8%-12%.

[0017] In some embodiments, the mass mixing ratio of the dried raw material to the biomass pellets used in step S2 is 1:(0.3-0.5). In practice, by adjusting the mixing ratio of the dried raw material to the biomass pellets, the overall moisture content of the dried raw material can be adjusted. At the same time, the biomass pellets can effectively improve the overall combustion performance of the fuel. Thus, by matching the specific mass ratio, the combustion performance and composite stability of the fuel can be synergistically improved.

[0018] In some embodiments, the biomass material in the biomass pellets used in step S2 includes at least one of wood sawdust and rice husks, and the biomass pellets have a particle size of 0.5 mm to 5 mm. In practice, by mixing wood sawdust and rice husks with the dried raw material, not only can these biomass materials be reused as resources, but the small-sized biomass pellets with a large specific surface area can also be used to reduce the overall particle size of the fuel after extrusion pelletization.

[0019] Example 1 This embodiment 1 provides a method for preparing biomass fuel derived from urban domestic feces and excrement, comprising the following steps: S1. Separating the solid and liquid of urban domestic feces to remove paper, plastic and other debris, and then allowing the feces to settle for 40 minutes, collecting the lower precipitate to obtain a dry raw material; S2, mixing the dried raw material with rice husks in a mass ratio of 1:0.4, and then tossing and mixing in a tossing device to obtain a dried raw material with a moisture content of 10%; S3. Using extrusion granulation equipment to extrude and granulate the dried raw materials to produce biomass fuel.

[0020] Example 2 This embodiment 2 provides a method for preparing biomass fuel derived from urban domestic feces and excrement, comprising the following steps: S1. Separating the solid and liquid of urban domestic feces to remove paper, plastic and other debris, and then allowing the feces to settle for 50 minutes, collecting the lower precipitate to obtain a dry raw material; S2, mixing the dried raw material with wood sawdust in a mass ratio of 1:0.4, and then tossing and mixing in a tossing device to obtain a dried raw material with a moisture content of 9%; S3. Using extrusion granulation equipment to extrude and granulate the dried raw materials to produce biomass fuel.

[0021] Example 3 This embodiment 3 provides a method for preparing biomass fuel derived from urban domestic feces, comprising the following steps: S1. Separating the solid and liquid of urban domestic feces to remove paper, plastic and other debris, and then allowing the feces to settle for 50 minutes, collecting the lower precipitate to obtain a dry raw material; S2, mixing the dried raw material with rice husks in a mass ratio of 1:0.5, and then tossing and mixing in a tossing device to obtain a dried raw material with a moisture content of 9%; S3. Using extrusion granulation equipment to extrude and granulate the dried raw materials to produce biomass fuel.

[0022] Example 4 This embodiment 4 provides a method for preparing biomass fuel derived from urban domestic feces and excrement, comprising the following steps: S1. Separating the solid and liquid of urban domestic feces to remove paper, plastic and other debris, and then allowing the feces to settle for 50 minutes, collecting the lower precipitate to obtain a dry raw material; S2. Mixing the dried raw material and the carbonized rice husk in a mass ratio of 1:0.5, and then tossing and mixing in a tossing device to obtain a dried raw material with a moisture content of 9%; carbonizing the rice husk in nitrogen at 500° C. in advance to obtain the carbonized rice husk; S3. Using extrusion granulation equipment to extrude and granulate the dried raw materials to produce biomass fuel.

[0023] Performance testing The combustion calorific value of the biomass fuels prepared in Examples 1 to 4 was detected. The calorific value of the biomass fuel prepared in Example 1 was taken as 100%, and the changes in the combustion calorific value of the biomass fuels in Examples 2 to 4 were calculated. The results are shown in Table 1 below.

[0024] Table 1 Changes in the combustion calorific value of the biomass fuels prepared in Examples 1 to 4

[0025] While the embodiments of the present invention have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations of these embodiments are possible. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as set forth in the claims. Furthermore, the invention described herein is susceptible to other embodiments and may be practiced or implemented in a variety of ways.

Claims

1. A method for preparing biomass fuel derived from urban feces, characterized in that: include: The solid-liquid separation of urban domestic feces and excrement is performed to obtain dry raw materials; the dry raw materials are mixed with biomass particles to obtain dried raw materials; and the dried raw materials are extruded and granulated to obtain biomass fuel.

2. The preparation method according to claim 1, characterized in that The moisture content of the dried raw material is 8%-12%.

3. The preparation method according to claim 1, characterized in that The mass mixing ratio of the dry raw material to the biomass particles is 1:(0.3-0.5).

4. The preparation method according to claim 1, characterized in that The biomass material in the biomass particles includes at least one of wood sawdust and rice husk.

5. The preparation method according to claim 1, characterized in that The particle size of the biomass particles is 0.5 mm to 5 mm.

6. The preparation method according to claim 1, characterized in that Separate urban domestic waste and remove paper and plastic in advance.

7. A biomass fuel prepared by the preparation method according to any one of claims 1 to 6.

8. Use of the biomass fuel prepared by the preparation method according to any one of claims 1 to 6.

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