Method for preparing fuel gas by mixing and gasifying landscaping waste and sludge
阅读说明：本技术 利用园林绿化废弃物与污泥混合气化制备燃气的方法 (Method for preparing fuel gas by mixing and gasifying landscaping waste and sludge ) 是由 陈冠益 卫海德 郭祥 张言斌 颜蓓蓓 程占军 马文超 于 2019-10-29 设计创作，主要内容包括：一种利用园林绿化废弃物与污泥混合气化制备燃气的方法及燃气,包括将园林绿化废弃物与污泥混合,形成混合物料；将混合物料热解气化,得到所述燃气。本发明利用污泥在气化过程中的非均相催化属性,与园林绿化废弃物混合气化,操作简单且环境友好,并制备高品质、低焦油含量的气化燃气,可促进生物质气化工艺的工业应用及推广,同时为园林绿化废弃物及污泥的处置提供参考路径。(A method for preparing fuel gas by mixing and gasifying landscaping waste and sludge comprises mixing landscaping waste and sludge to form a mixed material; and pyrolyzing and gasifying the mixed material to obtain the fuel gas. According to the invention, the heterogeneous catalysis property of the sludge in the gasification process is utilized, the sludge and the landscaping waste are mixed and gasified, the operation is simple and environment-friendly, the high-quality and low-tar-content gasified fuel gas is prepared, the industrial application and popularization of the biomass gasification process can be promoted, and a reference path is provided for the treatment of the landscaping waste and the sludge.)
1. A method for preparing fuel gas by mixing and gasifying landscaping waste and sludge comprises the following steps:
mixing landscaping waste with sludge to form a mixed material;
and pyrolyzing and gasifying the mixed material to obtain the fuel gas.
2. The method of claim 1,
the content of sludge in the mixed material is 30-60 wt%.
3. The method of claim 1,
the step of pyrolysis and gasification of the mixed materials is realized in a pyrolysis and gasification device;
the pyrolysis gasification equipment comprises a high-temperature tube furnace.
4. The method of claim 1,
the temperature of the pyrolysis gasification reaction is 700 to 900 ℃.
5. The method of claim 1,
the mesh number of the landscaping waste and the sludge is 40-80 meshes.
6. The method of claim 1,
the sludge is naturally air-dried sludge.
7. The method of claim 1,
the sludge comprises municipal sludge produced by municipal sewage treatment.
8. The method of claim 1,
the landscaping waste is naturally air-dried landscaping waste.
9. A fuel gas produced by the method of any one of claims 1 to 8.
10. The combustible gas of claim 9,
the heat value of the fuel gas is 4.3-5 MJ/Nm3；
The tar content in the fuel gas is 2 to 3g/Nm3；
The content of combustible components in the fuel gas is 21-27 vol%;
wherein the combustible component comprises H2CO and CH4；
Wherein, the H2The molar ratio to CO is from 1.12 to 1.53.
Technical Field
The invention belongs to the technical field of biomass resource energy utilization, and particularly relates to a method for preparing fuel gas by mixing and gasifying landscaping waste and sludge.
Background
The landscaping waste refers to plant branches, fallen leaves, grass scraps and the like generated by natural withering or artificial trimming of landscaping plants. Along with the increase of urban greening area, the yield of landscaping waste is increased sharply. At present, most landscaping wastes and household garbage are buried or burned together, so that serious environmental pollution and energy waste are caused. The landscaping waste is rich in lignocellulose and high in organic matter content, can be used for preparing biomass gas, and realizes recycling and energy conversion of the landscaping waste. Tar is an inevitable by-product of biomass gasification. The tar can be condensed in a pipeline, a filter or a heat exchanger of downstream equipment to form a complex structure, so that the mechanical failure of the whole system is caused, and the industrial popularization of the pyrolysis gasification technology is limited. The pyrolysis gasification technology is adopted to convert the landscaping waste into the low-tar and high-quality gasified fuel gas, so that the method has good research value and practical significance.
The sludge comes from the sewage treatment process, and the yield is increased year by year. By the end of 2017, according to statistical data, the annual sludge yield is about 6500 ten thousand tons. Sludge disposal has now become a new environmental problem associated with sewage treatment. The conventional treatment methods of sludge landfill, incineration, composting and the like are easy to generate secondary pollution. The pyrolysis gasification technology can convert organic components in the sludge into combustible gas and effectively reduce NOx and SO2The method can be used for discharging and killing pathogenic bacteria and the like, and is favorable for realizing harmless, quantitative reduction and resource treatment of the sludge.
The sludge contains a large amount of C, Fe, Si, Al and other metals (Cu, Ti, Ca, Mg, Zn, Ni) and non-metals (N, O, S, P), and is commonly used for synthesizing various heterogeneous carbonaceous catalysts. SS also contains heavy metals in varying proportions, such as: ba. Cu, Ca, Cr, Hg, Mo, Mn, Ni, Pb, Ti and Zn, which makes the sludge a stable and effective heterogeneous catalyst for environmental remediation. The inorganic elements P, Mg, Na and Fe can promote CO and CH in the gasification process4Generation and release of (1). Al is used as a carrier of various metals to strengthen the reversible Water-Gas Shift reaction (WGS). In addition to this, the present invention is,fe and Al in sludge2O3And CaO has a more positive effect on reducing tar in the biomass gasification process. Therefore, the sludge and the landscaping waste are mixed and gasified, and high-quality gasified fuel gas with low tar and improved fuel gas components is hopeful to be prepared. At present, the research on preparing fuel gas by mixing and gasifying landscaping waste and sludge is not reported. The prepared gasified fuel gas can be used for cooking and heating of residents and heating or power generation of industrial gas boilers.
Disclosure of Invention
In view of the above, one of the main objectives of the present invention is to provide a method for preparing fuel gas by mixing and gasifying landscaping waste and sludge, and fuel gas, so as to at least partially solve at least one of the above technical problems.
In order to achieve the above object, as one aspect of the present invention, there is provided a method for preparing fuel gas by mixing and gasifying landscaping waste and sludge, comprising:
mixing landscaping waste with sludge to form a mixed material;
and pyrolyzing and gasifying the mixed material to obtain the fuel gas.
As another aspect of the invention, the invention also provides the fuel gas prepared by the method.
Based on the technical scheme, compared with the prior art, the method for preparing the fuel gas by mixing and gasifying the landscaping waste and the sludge and the fuel gas have at least one of the following advantages:
1. the method for preparing the fuel gas by mixing and gasifying the landscaping waste and the sludge can provide a reference path for recycling and energy recycling of the landscaping waste and the sludge;
2. according to the invention, the heterogeneous catalysis property of the sludge in the gasification process is skillfully utilized, the sludge and landscaping waste are mixed and gasified, the operation is simple and environment-friendly, the high-quality and low-tar-content gasified fuel gas is prepared, and the industrial application and popularization of the biomass gasification process can be promoted;
3. the invention provides landscaping wasteThe heat value of the gasified fuel gas prepared by mixing and gasifying the substances and the sludge reaches 4.3-5 MJ/Nm3Combustible component of gasification gas (H)2+CO+CH4) The content of H is 21-27 vol%2The volume mol ratio of the carbon dioxide to CO is 1.12-1.53, and the tar content in the gasified gas is 2-3 g/Nm3. The prepared gasified fuel gas can be used for cooking and heating of residents and heating or power generation of industrial gas boilers.
Drawings
FIG. 1 is a schematic view of a pyrolysis and gasification apparatus of a high-temperature tube furnace according to example 1 of the present invention.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The invention discloses a method for preparing fuel gas by mixing and gasifying landscaping waste and sludge, which comprises the following steps:
mixing landscaping waste with sludge to form a mixed material;
and pyrolyzing and gasifying the mixed material to obtain the fuel gas.
Wherein the content of sludge in the mixed material is 30-60 wt%.
Wherein the step of pyrolysis gasification of the mixed materials is realized in a pyrolysis gasification device;
the pyrolysis gasification equipment comprises a high-temperature tube furnace.
Wherein the temperature of the pyrolysis gasification reaction is 700 to 900 ℃.
Wherein, the mesh number of the landscaping waste and the sludge is 40-80 meshes.
Wherein the sludge is naturally air-dried sludge.
Wherein the sludge comprises municipal sludge produced by municipal sewage treatment.
Wherein, the landscaping waste is naturally air-dried landscaping waste.
The invention also discloses the fuel gas prepared by the method.
Wherein, theThe heat value of the fuel gas is 4.3-5 MJ/Nm3；
The tar content in the fuel gas is 2 to 3g/Nm3；
The content of combustible components in the fuel gas is 21-27 vol%;
wherein the combustible component comprises H2CO and CH4；
Wherein, the H2The molar ratio to CO is from 1.12 to 1.53.
In an exemplary embodiment, the method for preparing fuel gas by mixing and gasifying landscaping waste and sludge according to the present invention comprises:
respectively crushing and sieving the naturally air-dried landscaping waste I and the sludge I to obtain landscaping waste II and sludge II;
mixing the landscaping waste II and the sludge II in proportion to form a mixed material;
and gasifying the mixed material to obtain the gasified fuel gas.
The pyrolysis gasification equipment includes, but is not limited to, a high-temperature tube furnace, and may be other high-temperature equipment capable of achieving gasification.
Wherein the gasification temperature of the gasification furnace is 700-900 ℃.
The first landscaping waste is landscaping waste which is naturally air-dried;
wherein the sludge I is naturally air-dried sludge;
wherein the sludge comprises municipal sludge produced by municipal sewage treatment and industrial sludge produced by other processes;
wherein the mesh number of the landscaping waste II and the sludge II is 40-80 meshes;
wherein the mass content of the sludge II in the mixed material formed by the landscaping waste II and the sludge II is 30-60 wt%;
wherein the step of gasifying the mixed materials is realized in a pyrolysis gasification device;
wherein the pyrolysis gasification apparatus includes, but is not limited to, a high temperature tube furnace;
wherein the pyrolysis gasification temperature is 700-900 ℃.
The invention also discloses the gasified fuel gas prepared by the method.
Wherein the heat value of the gasified fuel gas reaches 4.3-5 MJ/Nm3Combustible component of gasification gas (H)2+CO+CH4) The content of H is 21-27 vol%2The volume mol ratio of the carbon dioxide to CO is 1.12-1.53, and the tar content in the gasified gas is 2-3 g/Nm3。
In another exemplary embodiment, the method for preparing fuel gas by mixing and gasifying landscaping waste and sludge comprises the following steps:
1) preparing raw materials: respectively crushing and sieving naturally-dried landscaping wastes and sludge, and taking 40-80-mesh particles for later use;
2) mixing raw materials: uniformly mixing the landscaping waste crushed and sieved in the step 1) with sludge, wherein the mass content of the sludge in the mixed material is 30-60 wt%;
3) raw material gasification: putting the mixed material obtained in the step 2) into a gasification furnace for gasification, and gasifying at 700-900 ℃ to obtain gasified fuel gas.
Wherein the heat value of the obtained gasified fuel gas reaches 4.3-5 MJ/Nm3Combustible component of gasification gas (H)2+CO+CH4) The content of the tar reaches 21-27 vol%, the volume mol ratio of H2 to CO is 1.12-1.53, and the content of the tar in the gasified gas is 2-3 g/Nm3. The prepared gasified fuel gas can be used for cooking and heating of residents and heating or power generation of industrial gas boilers.
The technical solution of the present invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings. It should be noted that the following specific examples are given by way of illustration only and the scope of the present invention is not limited thereto.
The chemicals and raw materials used in the following examples were either commercially available or self-prepared by a known preparation method.
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