A method for preparing alternative fuels using various solid wastes such as industrial scraps, domestic sludge, and stale garbage

Abstract

The invention discloses a method for preparing alternative fuels by utilizing various solid wastes such as industrial scraps, domestic sludge, stale garbage, etc.; the solid wastes are first classified, inspected, and selected, and then microorganisms and microbial fermentation promoters are added for fermentation; finally, a modifier and an impregnating agent are added and mixed evenly, and then the wastes are crushed and screened by a crusher; the alternative fuel prepared by the invention has the advantages of short ignition time, long combustion time, low residue rate, high calorific value, etc., and can be applied to most industries requiring coal combustion, such as cement, electricity, steel, brick making, glass, etc.; the alternative fuel prepared by the invention not only directly reduces the harm of these wastes to the environment, but also has obvious economic benefits, and can effectively alleviate the current problem of energy shortage.

Description

Technical Field

[0001] The invention relates to the field of alternative fuels, in particular to a method for preparing alternative fuels by utilizing various solid wastes such as industrial scraps, domestic sludge, and stale garbage. Background Art

[0002] my country's industrial solid waste and domestic garbage are large in quantity, complex in types, and have a wide geographical distribution. They have always faced the problems of difficult management and disposal.

[0003] CN202110503509.8 applies for a method for preparing alternative fuels using aluminum electrolytic cell overhaul slag, which specifically includes the following steps: Step S1: crushing the overhaul slag into small particles with a particle size of less than 15mm; Step S2: mixing carbon-based additives and small particles, and conveying them to a tube mill for modified grinding to obtain modified powder. And a system for this method, the present invention is to modify and grind the crushed small particles and carbon-based additives according to a ratio, and the carbon-based additives are used as grinding and combustion aids, so that the unit energy consumption is effectively reduced by more than 20%. Compared with the original overhaul slag, the comprehensive calorific value of the mixed powder after modified grinding is increased to more than 4000kcal / kg, and the volatile matter can be increased from 0 to 5-10%. At the same time, due to the addition of carbon-based additives, the ignition point is reduced by about 100°C, and the combustion performance is improved.

[0004] CN201110401916.4 applies for a method for preparing cement substitute fuel using paint residue, comprising the following steps: a) preparing paint residue with a water content greater than 55% into a paint residue suspension; b) removing solid impurities from the paint residue suspension; c) mixing the paint residue suspension with solid impurities removed with a modifier to prepare modified paint residue; d) dehydrating the modified paint residue to obtain solid paint residue; e) crushing the dehydrated solid paint residue; f) mixing the crushed paint residue with an impregnating agent to obtain substitute fuel. Paint residue with a water content less than 55% directly starts from step e. The present invention makes full use of the calorific value of organic matter in waste paint residue to prepare a cement kiln substitute fuel with a single property and stable calorific value, so as to solve the problem of direct incineration and disposal of waste paint residue, and at the same time solve the fuel problem caused by high energy consumption in the cement industry.

[0005] CN201120506226.0 applied for a device for preparing alternative fuel using waste paint residue, which mainly includes: a paint residue receiving tank, the drainage port at the bottom of which is connected to the modified preparation tank; a modifier storage bin, which is a closed bin, the bottom of which is connected to the modified preparation tank; the modified preparation tank is connected to the feed end of the dehydration device; the dehydration device is provided with a dry material outlet and a waste liquid outlet, the dry material outlet is connected to the feed end of the crusher, and the waste liquid outlet is connected to the waste liquid storage tank; the discharge end of the crusher is connected to the feed inlet of the mixer; an impregnating agent storage bin, which is a closed bin, the bottom of which is connected to the feed inlet of the mixer; the bottom of the mixer is provided with a finished product discharge port. The alternative fuel obtained by the utility model has a stable physical form, is homogeneous, loose, does not form a mass, is easy to store and transport, and is particularly suitable for incineration in cement kilns.

[0006] A considerable portion of industrial solid waste and domestic garbage has the characteristics of high calorific value and flammability. The existing technology adopts conventional disposal methods such as landfill, incineration, solidification / stabilization for this type of solid waste, which not only causes secondary pollution to the environment, but also poses a fire hazard to social security and causes a certain degree of energy waste; while the disposal method of incineration power generation has the disadvantages of high initial investment cost, high operating cost, low energy recovery rate, and secondary pollution (especially dioxin and slag pollution). Summary of the invention

[0007] In order to make full use of various solid wastes such as industrial scraps, domestic sludge, stale garbage, etc., reduce environmental pollution, and turn waste into treasure, the present invention discloses a method for preparing alternative fuels using various solid wastes such as industrial scraps, domestic sludge, stale garbage, etc.

[0008] The specific steps are as follows:

[0009] S1 Classification, inspection, and selection: Classify and store wastes, conduct sampling inspections, and analyze and determine which wastes are suitable for the production of alternative fuels;

[0010] S2 fermentation: take 85-100 parts of waste by weight, add 0.002-0.01 parts of microorganisms and 0.005-0.1 parts of microbial fermentation promoter, mix well, and ferment;

[0011] S3 Crushing: After adding 3-8 parts of modifier and 7-15 parts of impregnating agent and mixing evenly, the waste is crushed by a crusher;

[0012] S4 screening: By adjusting the diameter of the drum screen holes, the waste that does not meet the size is screened out to obtain alternative fuel;

[0013] S5 Utilization: Add the alternative fuel to the cement kiln fuel at a mass percentage of 20%-30%, add a smoke suppression aid with a carbon content of 0.08%-0.6% of the alternative fuel, mix well, and then put it into the cement kiln for use as fuel.

[0014] Optionally, the waste selection criteria are: first, the waste contains a sufficiently high calorific value; second, the halogen elements, heavy metal elements, etc. contained in the waste are within a controllable range; and third, the waste mixed with each other will not produce any undesirable, negative chemical reactions.

[0015] Optionally, the microorganism is actinomycetes, Escherichia coli or Helicobacter pylori.

[0016] Optionally, the microbial fermentation promoter is lactose.

[0017] Optionally, the fermentation time is 3-30 days.

[0018] Optionally, the modifier is garbage fly ash or cement raw meal.

[0019] Optionally, the impregnating agent is sawdust, straw, rice bran or corn stalks.

[0020] Optionally, the particle size after crushing is 3-5 mm.

[0021] Optionally, the mesh size of the drum screen is 4-4.5x5mm.

[0022] Furthermore, in order to reduce harmful smoke generated by combustion, the present invention also discloses a method for preparing a smoke suppression auxiliary agent, wherein sodium aminoborate, magnesium acrylate and amino hydrotalcite can undergo an amino addition reaction, and the obtained borate and magnesium salt are combined on the surface of the hydrotalcite to improve the smoke suppression effect.

[0023] The specific steps are as follows:

[0024] Step 1: weigh 120-125 parts of magnesium aluminum hydrotalcite, 500-1000 parts of water, and 2.00-4.50 parts of aminosiloxane, and fully disperse the mixed solution during ultrasound; react at 80-100° C. for 1-3 hours, filter, wash with deionized water to neutrality, and freeze-dry to finally obtain amino hydrotalcite;

[0025] Step 2: According to the mass proportions, add 16-30 parts of sodium aminoborate, 5-12 parts of magnesium acrylate, 200-300 parts of N,N-dimethylformamide, 70-89 parts of aminohydrotalcite, and 0.02-0.2 parts of sodium methoxide, control the temperature to 80-90°C, stir for 30-60 minutes, then cool to 40-60°C, vacuum distill to remove the white oil, and dry to obtain the smoke suppression agent.

[0026] The alternative fuel prepared by the embodiment of the present invention has the advantages of short ignition time, long burning time, low residue rate, high calorific value, etc., and can be applied to most industries that require coal combustion, such as cement, electricity, steel, brick making, glass, etc.; the alternative fuel prepared by the present invention not only directly reduces the harm of these wastes to the environment, but also has obvious economic benefits, and can also effectively alleviate the current energy shortage problem. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of this technical solution clearer, the technical solution is further described in detail below in combination with specific implementation cases and comparative examples. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of this technical solution.

[0028] The calorific value determination standard adopts GBT14402-2007 Combustion performance and calorific value determination standard of building materials and products.

[0029] The present invention adopts the scraps from Zhejiang Putian Ruixin Company, and its calorific value and chloride ion content are as follows:

[0030]

[0031]

[0032] Example 1

[0033] A method for preparing alternative fuels using various solid wastes such as industrial scraps, domestic sludge, and stale garbage comprises the following steps:

[0034] S1 Classification, inspection, and selection: Classify and store wastes, conduct sampling inspections, and analyze and determine which wastes are suitable for the production of alternative fuels;

[0035] S2 fermentation: Take 85g of waste, add 0.002g of microorganisms and 0.005g of microbial fermentation promoter, mix well, and ferment;

[0036] S3 Crushing: Add 3g of modifier and 7g of impregnating agent and mix them evenly, then use a crusher to crush the waste;

[0037] S4 screening: By adjusting the diameter of the drum screen holes, the waste that does not meet the size is screened out to obtain alternative fuel;

[0038] S5 Utilization: Add the alternative fuel to the cement kiln fuel at a dosage of 20%, add a smoke suppression aid with a carbon dosage of 0.08% of the alternative fuel, mix well, and then put it into the cement kiln for use as fuel.

[0039] The criteria for waste selection are: first, the waste contains a sufficiently high calorific value; second, the halogen elements, heavy metal elements, etc. contained in the waste are within a controllable range; and third, the waste mixed with each other will not produce any undesirable, negative chemical reactions.

[0040] The microorganisms are actinomycetes.

[0041] The microbial fermentation accelerator is lactose.

[0042] The fermentation time is 3 days.

[0043] The modifier is garbage fly ash.

[0044] The impregnating agent is sawdust

[0045] The particle size after crushing is 3 mm.

[0046] The mesh size of the drum screen is 4x5mm.

[0047] The smoke suppressant aid is prepared by the following method:

[0048] Step 1: Weigh 120 g of magnesium aluminum hydrotalcite, 500 g of water, and 2.00 g of aminosiloxane, and fully disperse the mixed solution during ultrasound; react at 80° C. for 1 h, filter, wash with deionized water until neutral, and freeze-dry to finally obtain amino hydrotalcite;

[0049] Step 2: Add 16 g of sodium aminoborate, 5 g of magnesium acrylate, 200 g of N,N-dimethylformamide, 70 g of aminohydrotalcite, and 0.02 g of sodium methoxide, control the temperature to 80°C, stir for 30 minutes, then cool to 40°C, vacuum distill to remove white oil, and dry to obtain the smoke suppression agent.

[0050] Example 2

[0051] A method for preparing alternative fuels using various solid wastes such as industrial scraps, domestic sludge, and stale garbage comprises the following steps:

[0052] S1 Classification, inspection, and selection: Classify and store wastes, conduct sampling inspections, and analyze and determine which wastes are suitable for the production of alternative fuels;

[0053] S2 fermentation: Take 90g of waste, add 0.005g of microorganisms and 0.05g of microbial fermentation promoter, mix well, and ferment;

[0054] S3 Crushing: After adding 5g of modifier and 10g of impregnating agent and mixing evenly, the waste is crushed by a crusher;

[0055] S4 screening: By adjusting the diameter of the drum screen holes, the waste that does not meet the size is screened out to obtain alternative fuel;

[0056] S5 Utilization: Add the alternative fuel to the cement kiln fuel at a dosage of 24%, add a smoke suppression aid with a carbon dosage of 0.2% of the alternative fuel, mix well, and then put it into the cement kiln for use as fuel.

[0057] The criteria for waste selection are: first, the waste contains a sufficiently high calorific value; second, the halogen elements, heavy metal elements, etc. contained in the waste are within a controllable range; and third, the waste mixed with each other will not produce any undesirable, negative chemical reactions.

[0058] The microorganism is Escherichia coli.

[0059] The microbial fermentation accelerator is lactose.

[0060] The fermentation time is 10 days.

[0061] The modifier is garbage fly ash.

[0062] The impregnating agent is straw.

[0063] The particle size after crushing is 4 mm.

[0064] The mesh size of the drum screen is 4x5mm.

[0065] The smoke suppressant aid is prepared by the following method:

[0066] Step 1: weigh 122 g of magnesium aluminum hydrotalcite, 700 g of water, and 2.5 g of aminosiloxane, and fully disperse the mixed solution during ultrasound; react at 85° C. for 1.5 h, filter, wash with deionized water until neutral, and freeze-dry to finally obtain amino hydrotalcite;

[0067] Step 2: Add 20g of sodium aminoborate, 7g of magnesium acrylate, 240g of N,N-dimethylformamide, 75g of aminohydrotalcite, and 0.1g of sodium methoxide, control the temperature to 85°C, stir for 40 minutes, then cool to 45°C, vacuum distill to remove white oil, and dry to obtain the smoke suppression agent.

[0068] Example 3

[0069] A method for preparing alternative fuels using various solid wastes such as industrial scraps, domestic sludge, and stale garbage comprises the following steps:

[0070] S1 Classification, inspection, and selection: Classify and store wastes, conduct sampling inspections, and analyze and determine which wastes are suitable for the production of alternative fuels;

[0071] S2 fermentation: Take 95g of waste, add 0.008g of microorganisms and 0.08g of microbial fermentation promoter, mix well, and ferment;

[0072] S3 Crushing: After adding 7g of modifier and 12g of impregnating agent and mixing evenly, the waste is crushed by a crusher;

[0073] S4 screening: By adjusting the diameter of the drum screen holes, the waste that does not meet the size is screened out to obtain alternative fuel;

[0074] S5 Utilization: Add the alternative fuel to the cement kiln fuel at a dosage of 28%, add a smoke suppression aid with a carbon dosage of 0.4% of the alternative fuel, mix well, and then put it into the cement kiln for use as fuel.

[0075] The criteria for waste selection are: first, the waste contains a sufficiently high calorific value; second, the halogen elements, heavy metal elements, etc. contained in the waste are within a controllable range; and third, the waste mixed with each other will not produce any undesirable, negative chemical reactions.

[0076] The microorganism is Escherichia coli.

[0077] The microbial fermentation accelerator is lactose.

[0078] The fermentation time is 25 days.

[0079] The modifier is cement raw material.

[0080] The impregnating agent is rice bran.

[0081] The particle size after crushing is 4 mm.

[0082] The mesh size of the drum screen is 4.5x5mm.

[0083] The smoke suppressant aid is prepared by the following method:

[0084] Step 1: Weigh 124 g of magnesium aluminum hydrotalcite, 900 g of water, and 4 g of aminosiloxane, and fully disperse the mixed solution during ultrasound; react at 95° C. for 2.5 h, filter, wash with deionized water until neutral, and freeze-dry to finally obtain amino hydrotalcite;

[0085] Step 2: Add 28g of sodium aminoborate, 10g of magnesium acrylate, 280g of N,N-dimethylformamide, 85g of aminohydrotalcite, and 0.15g of sodium methoxide, control the temperature to 85°C, stir for 50min, then cool to 55°C, vacuum distill to remove white oil, and dry to obtain the smoke suppression agent.

[0086] Example 4

[0087] A method for preparing alternative fuels using various solid wastes such as industrial scraps, domestic sludge, and stale garbage comprises the following steps:

[0088] S1 Classification, inspection, and selection: Classify and store wastes, conduct sampling inspections, and analyze and determine which wastes are suitable for the production of alternative fuels;

[0089] S2 fermentation: take 100g of waste, add 0.01g of microorganisms and 0.1g of microbial fermentation promoter, mix well, and ferment;

[0090] S3 Crushing: After adding 8g of modifier and 15g of impregnating agent and mixing evenly, the waste is crushed by a crusher;

[0091] S4 screening: By adjusting the diameter of the drum screen holes, the waste that does not meet the size is screened out to obtain alternative fuel;

[0092] S5 Utilization: Add the alternative fuel to the cement kiln fuel at a dosage of 30%, add a smoke suppression aid with a carbon dosage of 0.6% of the alternative fuel, mix well, and then put it into the cement kiln for use as fuel.

[0093] The criteria for waste selection are: first, the waste contains a sufficiently high calorific value; second, the halogen elements, heavy metal elements, etc. contained in the waste are within a controllable range; and third, the waste mixed with each other will not produce any undesirable, negative chemical reactions.

[0094] The microorganism is a spirochete.

[0095] The microbial fermentation accelerator is lactose.

[0096] The fermentation time is 30 days.

[0097] The modifier is cement raw material.

[0098] The impregnating agent is corn stalks.

[0099] The particle size after crushing is 5 mm.

[0100] The mesh size of the drum screen is 4.5x5mm.

[0101] The smoke suppressant aid is prepared by the following method:

[0102] Step 1: Weigh 125 g of magnesium aluminum hydrotalcite, 1000 g of water, and 4.50 g of aminosiloxane, and fully disperse the mixed solution during ultrasound; react at 100° C. for 3 h, filter, wash with deionized water until neutral, and freeze-dry to finally obtain amino hydrotalcite;

[0103] Step 2: Add 30 g of sodium aminoborate, 12 g of magnesium acrylate, 300 g of N,N-dimethylformamide, 89 g of aminohydrotalcite, and 0.2 g of sodium methoxide, control the temperature to 90°C, stir for 60 minutes, then cool to 60°C, vacuum distill to remove white oil, and dry to obtain the smoke suppression agent.

[0104] Comparative Example 1

[0105] A method for preparing alternative fuels using various solid wastes such as industrial scraps, domestic sludge, and stale garbage comprises the following steps:

[0106] S1 Classification, inspection, and selection: Classify and store wastes, conduct sampling inspections, and analyze and determine which wastes are suitable for the production of alternative fuels;

[0107] S2 fermentation: Take 90g of waste, add 0.005g of microorganisms and 0.05g of microbial fermentation promoter, mix well, and ferment;

[0108] S3 Crushing: After adding 5g of modifier and 10g of impregnating agent and mixing evenly, the waste is crushed by a crusher;

[0109] S4 screening: By adjusting the diameter of the drum screen holes, the waste that does not meet the size is screened out to obtain alternative fuel;

[0110] S5 Utilization: Add the alternative fuel to the cement kiln fuel at a dosage of 24%, mix evenly, and then put it into the cement kiln for use as fuel.

[0111] The criteria for waste selection are: first, the waste contains a sufficiently high calorific value; second, the halogen elements, heavy metal elements, etc. contained in the waste are within a controllable range; and third, the waste mixed with each other will not produce any undesirable, negative chemical reactions.

[0112] The microorganism is Escherichia coli.

[0113] The microbial fermentation accelerator is lactose.

[0114] The fermentation time is 10 days.

[0115] The modifier is garbage fly ash.

[0116] The impregnating agent is straw.

[0117] The particle size after crushing is 4 mm.

[0118] The mesh size of the drum screen is 4x5mm.

[0119] Comparative Example 2

[0120] A method for preparing alternative fuels using various solid wastes such as industrial scraps, domestic sludge, and stale garbage comprises the following steps:

[0121] S1 Classification, inspection, and selection: Classify and store wastes, conduct sampling inspections, and analyze and determine which wastes are suitable for the production of alternative fuels;

[0122] S2 fermentation: Take 90g of waste, add 0.005g of microorganisms and 0.05g of microbial fermentation promoter, mix well, and ferment;

[0123] S3 Crushing: After adding 5g of modifier and 10g of impregnating agent and mixing evenly, the waste is crushed by a crusher;

[0124] S4 screening: By adjusting the diameter of the drum screen holes, the waste that does not meet the size is screened out to obtain alternative fuel;

[0125] S5 Utilization: Add the alternative fuel to the cement kiln fuel at a dosage of 24%, add a smoke suppression aid with a carbon dosage of 0.2% of the alternative fuel, mix well, and then put it into the cement kiln for use as fuel.

[0126] The criteria for waste selection are: first, the waste contains a sufficiently high calorific value; second, the halogen elements, heavy metal elements, etc. contained in the waste are within a controllable range; and third, the waste mixed with each other will not produce any undesirable, negative chemical reactions.

[0127] The microorganism is Escherichia coli.

[0128] The microbial fermentation accelerator is lactose.

[0129] The fermentation time is 10 days.

[0130] The modifier is garbage fly ash.

[0131] The impregnating agent is straw.

[0132] The particle size after crushing is 4 mm.

[0133] The mesh size of the drum screen is 4x5mm.

[0134] The smoke suppressant aid is prepared by the following method:

[0135] Step 1: weigh 122 g of magnesium aluminum hydrotalcite, 700 g of water, and 2.5 g of aminosiloxane, and fully disperse the mixed solution during ultrasound; react at 85° C. for 1.5 h, filter, wash with deionized water until neutral, and freeze-dry to finally obtain amino hydrotalcite;

[0136] Step 2: Add 20g of sodium aminoborate, 7g of magnesium acrylate, 240g of N,N-dimethylformamide, and 0.1g of sodium methoxide, control the temperature to 85°C, stir for 40 minutes, then cool to 45°C, vacuum distill to remove white oil, and dry to obtain the smoke suppression agent.

[0137] Comparative Example 3

[0138] A method for preparing alternative fuels using various solid wastes such as industrial scraps, domestic sludge, and stale garbage comprises the following steps:

[0139] S1 Classification, inspection, and selection: Classify and store wastes, conduct sampling inspections, and analyze and determine which wastes are suitable for the production of alternative fuels;

[0140] S2 fermentation: Take 90g of waste, add 0.005g of microorganisms and 0.05g of microbial fermentation promoter, mix well, and ferment;

[0141] S3 Crushing: After adding 5g of modifier and 10g of impregnating agent and mixing evenly, the waste is crushed by a crusher;

[0142] S4 screening: By adjusting the diameter of the drum screen holes, the waste that does not meet the size is screened out to obtain alternative fuel;

[0143] S5 Utilization: Add the alternative fuel to the cement kiln fuel at a dosage of 24%, add a smoke suppression aid with a carbon dosage of 0.2% of the alternative fuel, mix well, and then put it into the cement kiln for use as fuel.

[0144] The criteria for waste selection are: first, the waste contains a sufficiently high calorific value; second, the halogen elements, heavy metal elements, etc. contained in the waste are within a controllable range; and third, the waste mixed with each other will not produce any undesirable, negative chemical reactions.

[0145] The microorganism is Escherichia coli.

[0146] The microbial fermentation accelerator is lactose.

[0147] The fermentation time is 10 days.

[0148] The modifier is garbage fly ash.

[0149] The impregnating agent is straw.

[0150] The particle size after crushing is 4 mm.

[0151] The mesh size of the drum screen is 4x5mm.

[0152] The smoke suppressant aid is prepared by the following method:

[0153] Step 1: weigh 122 g of magnesium aluminum hydrotalcite, 700 g of water, and 2.5 g of aminosiloxane, and fully disperse the mixed solution during ultrasound; react at 85° C. for 1.5 h, filter, wash with deionized water until neutral, and freeze-dry to finally obtain amino hydrotalcite;

[0154] Step 2: Add 20 g of sodium aminoborate, 240 g of N,N-dimethylformamide, 75 g of aminohydrotalcite, and 0.1 g of sodium methoxide, control the temperature to 85°C, stir for 40 minutes, then cool to 45°C, vacuum distill to remove white oil, and dry to obtain the smoke suppression agent.

[0155] The analysis and test results of the above Examples 1-4 and Comparative Examples 1-3 are shown in the following table:

[0156]

Claims

1. A method for preparing alternative fuels using industrial scraps, domestic sludge, and stale garbage solid waste, characterized in that: The steps include: S1 Classification, inspection, and selection: Classify and store wastes, conduct sampling inspections, and analyze and determine which wastes are suitable for the production of alternative fuels; S2 fermentation: take 85-100 parts of waste by weight, add 0.002-0.01 parts of microorganisms and 0.005-0.1 parts of microbial fermentation promoter, mix well, and ferment; S3 Crushing: After adding 3-8 parts of modifier and 7-15 parts of impregnating agent and mixing evenly, the waste is crushed by a crusher; S4 screening: By adjusting the diameter of the drum screen holes, the waste that does not meet the size is screened out to obtain alternative fuel; S5 Utilization: Add the alternative fuel to the cement kiln fuel in an amount of 20%-30% by mass, add a smoke suppression aid of 0.08%-0.6% carbon of the alternative fuel, mix well, and then put it into the cement kiln for use as fuel; The smoke suppressant aid is prepared by the following method: Step 1: weigh 120-125 parts of magnesium aluminum hydrotalcite, 500-1000 parts of water, and 2.00-4.50 parts of aminosiloxane, and fully disperse the mixed solution during ultrasound; react at 80-100° C. for 1-3 hours, filter, wash with deionized water to neutrality, and freeze-dry to finally obtain amino hydrotalcite; Step 2: According to the mass proportions, add 16-30 parts of sodium aminoborate, 5-12 parts of magnesium acrylate, 200-300 parts of N,N-dimethylformamide, 70-89 parts of aminohydrotalcite, and 0.02-0.2 parts of sodium methoxide, control the temperature to 80-90°C, stir for 30-60 minutes, then cool to 40-60°C, vacuum distill to remove the white oil, and dry to obtain the smoke suppression agent.

2. A method for preparing alternative fuels using industrial scraps, domestic sludge, and stale garbage solid waste according to claim 1, wherein: The criteria for waste selection are: first, the waste contains a sufficiently high calorific value; second, the halogen elements and heavy metal elements contained in the waste are within a controllable range; and third, the waste mixed with each other will not produce any undesirable, negative chemical reactions.

3. A method for preparing alternative fuels using industrial scraps, domestic sludge, and stale garbage solid waste according to claim 1, wherein: The microorganism is actinomycetes, Escherichia coli or spirochetes.

4. A method for preparing alternative fuels using industrial scraps, domestic sludge, and stale garbage solid waste according to claim 1, wherein: The microbial fermentation accelerator is lactose.

5. A method for preparing alternative fuels using industrial scraps, domestic sludge, and stale garbage solid waste according to claim 1, wherein: The fermentation time is 3-30 days.

6. A method for preparing alternative fuels using industrial scraps, domestic sludge, and stale garbage solid waste according to claim 1, wherein: The modifier is garbage fly ash or cement raw material.

7. A method for preparing alternative fuels using industrial scraps, domestic sludge, and stale garbage solid waste according to claim 1, wherein: The impregnating agent is wood chips, straw, rice bran or corn stalks.

8. A method for preparing alternative fuels using industrial scraps, domestic sludge, and stale garbage solid waste according to claim 1, wherein: The particle size after crushing is 3-5 mm.

9. A method for preparing alternative fuels using industrial scraps, domestic sludge, and stale garbage solid waste according to claim 1, wherein: The mesh size of the drum screen is 4-4.5x5mm.

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