A method for co-processing expired food in cement kilns

Abstract

The present invention discloses a method for the coordinated disposal of expired food in a cement kiln, which belongs to the field of environmental protection. The method utilizes a shearing crusher to first crush the expired food; then, after mixing it with organic sludge in a silo in a certain proportion, it is evenly mixed with a grab bucket and fermented; the fermented material is conveyed to a cement kiln for high-temperature incineration treatment using a spiral; the method employing a cement kiln to coordinate the disposal of expired food in the present invention has a simple process and low processing cost; the method employing a cement kiln to coordinate the disposal of expired food in the present invention has the advantages of waste reduction, energy conservation and emission reduction, harmless treatment, recycling, and green development, and is suitable for the large-scale disposal of expired food.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection, and in particular to a method for co-disposing expired food in a cement kiln. Background Art

[0002] As living standards improve, so does the quality of life. The disposal of expired and substandard food is a thorny issue facing many food companies and supermarkets.

[0003] Chinese Patent CN202210335519.X: A method for classified disposal and reduction treatment of urban garbage, belonging to the field of environmental protection technology. Using classified disposal, source control, on-site reduction, ceramsite production and closed cracking technology, the garbage can be quickly returned to its source, turning waste into treasure. The purpose of harmless, resource-based, industrialized and reduced disposal of garbage is achieved. Compared with the traditional classification treatment methods of landfill, incineration and composting, the present invention has unique advantages. It has the characteristics of convenience, environmental protection, emission reduction, energy saving, resource conservation and freight saving, and is suitable for the treatment of various urban and rural garbage.

[0004] Chinese Patent CN202211543263.8: Provides a method and system for the coordinated treatment of catering waste and kitchen waste, mainly through the combination of a catering waste treatment system, a biogas system, a kitchen waste treatment system, a sewage treatment system, a deodorization system and a biological drying bin; realizes the simultaneous treatment of catering waste and kitchen waste, separates the three phases (oil, liquid and solid) and treats them separately, and finally the solid residue enters the biological drying bin for final drying treatment, thereby realizing the final simultaneous treatment of the two types of waste.

[0005] Chinese Patent CN202211521856.4: Provides a method for full-scale treatment of wet garbage, belonging to the technical field of garbage treatment. The present invention performs saccharification pretreatment on the purified wet garbage after crushing and sterilization to obtain saccharification pretreated wet garbage; performs solid-liquid separation on the saccharification pretreated wet garbage, collects liquid phase components and solid phase components; mixes the liquid phase components with lactic acid-producing bacteria, and ferments to obtain a fermentation product containing lactic acid; performs alkaline heat treatment on the solid phase components to obtain an alkaline heat treatment product containing protein. The present invention can recover two high-value products, lactic acid and protein, by full-scale treatment of the liquid and solid phases of wet garbage. Lactic acid and protein can be used as precursor materials for biosynthesis, such as lactic acid synthesis of degradable plastics, protein preparation of adhesives or foam fire extinguishing agents, etc. The method of the present invention can overcome the problem of low value of recovered products in mainstream biotransformation methods (anaerobic digestion to produce biogas and other technologies). Summary of the Invention

[0006] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0007] To this end, the first purpose of the present invention is to propose a method for co-disposal of expired food in a cement kiln. The method of co-disposal of expired food in a cement kiln has a simple process and low processing cost, and has the advantages of waste reduction, energy conservation and emission reduction, harmless treatment, recycling, and green development.

[0008] The second object of the present invention is to provide a method for preparing a carbon dioxide absorbing filler, wherein CO2 molecules are adsorbed in the mutually permeable carbon dioxide absorbing filler, and the porous coordinated carbon dioxide absorbing filler has a significant improvement in capturing carbon dioxide.

[0009] To achieve the above objectives, the present invention provides a method for co-processing expired food in a cement kiln, the operating steps of which are as follows:

[0010] S1: Use a shear crusher to crush expired food;

[0011] S2: Then it is mixed with the organic sludge in the silo in a certain proportion;

[0012] S3: Use a grab bucket to mix evenly and ferment for 3-7 days;

[0013] S4: The fermented material is transported by screw to the cement kiln for high-temperature incineration;

[0014] S5: After leaving the kiln, it enters the grate cooler for cooling, and the ash is used as cement clinker;

[0015] S6: After the incineration tail gas reaches the national emission standard through the exhaust gas purification device, it is discharged; the exhaust gas purification device is provided with an exhaust gas comprehensive monitoring system, and an exhaust gas flow meter is provided at the connection between the exhaust gas purification device and the auxiliary exhaust fan.

[0016] Furthermore, the crushed particle size is 100-300 mm.

[0017] Furthermore, the ratio of the sludge to expired food is 8-12:1.

[0018] Furthermore, the temperature in the cement kiln is 1350-1500° C., and the residence time is 30-60 minutes.

[0019] Furthermore, the cooling is performed to a temperature of 60-85°C.

[0020] Furthermore, the ash is mixed into cement clinker at a ratio of 5-15%.

[0021] Furthermore, the cement kiln exhaust gas collection device includes a spray tower, an adsorption dust collector and a main exhaust fan, the main exhaust fan is connected to the chimney, the main exhaust fan, the induced draft fan and the calcium hydroxide absorption tower, the adsorption dust collector are connected through a pipeline, and the adsorption dust collector is connected to the cement kiln exhaust gas outlet.

[0022] Furthermore, a calcium hydroxide aqueous solution with a mass concentration of 20-30% is introduced into the spray tower to spray the tail gas for carbonization reaction; the tail gas after spraying is then passed through an adsorption dust collector to continue absorbing carbon dioxide and carbon monoxide;

[0023] Furthermore, a carbon dioxide absorbing filler is added to the adsorption dust collector in an amount of 10-20% by volume of the adsorption dust collector to reduce the content of carbon dioxide and carbon monoxide in the exhaust gas;

[0024] Furthermore, filler filter plates are equidistantly arranged in sequence in the adsorption dust collector for adsorbing carbon dioxide and carbon monoxide, and the spacing between the filler filter plates is 0.4-1.2m; the above-mentioned tail gas after spraying enters the adsorption dust collector containing the filler filter plates from the bottom of the tower, and after the adsorption is completed, carbon dioxide and carbon monoxide are obtained. The tail gas with qualified emissions is discharged through the chimney.

[0025] Furthermore, the preparation method of the carbon dioxide absorbing filler is:

[0026] S1: Add 200-300 parts of hydroxyapatite, 20-30 parts of 3-isocyanate propylene, 2-5 parts of isobutyl titanate, and 1000-2000 parts of DMF to a reactor according to their mass ratio, control the temperature at 60-70°C, and react for 2-4 hours;

[0027] S2: Add 20-50 parts of triethanolamine and 1-4 parts of dibutyltin dilaurate, mix and stir evenly, control the temperature to 60-70°C, and react for 50-150 minutes;

[0028] S3: Add 20-35 parts of the organic metal zinc material reaction solution and 1-3 parts of benzoyl peroxide, continue the reaction for 2-5 hours, filter, dry in an oven at 100-120° C. for 5-9 hours, and grind into a solid powder to obtain a carbon dioxide absorbing filler.

[0029] Furthermore, the preparation method of the organic metal zinc material is:

[0030] Weigh 10-18 parts of zinc nitrate, add 100-130 parts of methanol, and sonicate to dissolve it to obtain a zinc nitrate solution;

[0031] Then weigh 2-5 parts of vinyl imidazole, and stir for 7-11 hours under magnetic stirring at a stirring rate of 800-1200 r / min to obtain an organometallic zinc material reaction solution.

[0032] The method comprises the following steps: 3-isocyanate propylene undergoes an esterification reaction with hydroxyapatite to obtain 3-isocyanate propylene apatite; the condensation reaction is then carried out with triethanolamine; the product is copolymerized with an organic metal zinc material to obtain a carbon dioxide absorbing filler.

[0033] Compared with the prior art, the method of co-processing expired food in a cement kiln of the present invention has the following significant effects:

[0034] 1. The present invention adopts a method of co-disposal of expired food using a cement kiln, which has a simple process and low processing cost;

[0035] 2. High incineration efficiency: Cement kilns have a large incineration space and a wide range of applications, enabling the disposal of large quantities of various expired foods. Under high-temperature incineration conditions, the organic matter in expired foods can be completely decomposed, eliminating the secondary treatment problem of incineration ash in traditional incineration disposal processes, significantly improving incineration efficiency.

[0036] 3. The present invention adopts a method for co-disposal of expired food in cement kilns, which has the advantages of waste reduction, energy conservation and emission reduction, harmless treatment, recycling, and green development, and is suitable for large-scale treatment of expired food;

[0037] 4. CO2 molecules are adsorbed in the mutually penetrating carbon dioxide absorption filler. The porous coordinated carbon dioxide absorption filler has made significant progress in capturing carbon dioxide. The negatively charged oxygen atoms are close to the positively charged zinc atoms, and the positively charged carbon atoms are close to the negatively charged carboxyl atoms, which leads to electrostatic interaction between CO2 molecules and zinc ions and carboxyl groups, thereby improving the adsorption effect of carbon dioxide.

[0038] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned through practice of the present invention. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the concept of the present invention.

[0040] In a specific implementation, the following formula is used for relevant calculations:

[0041] Destruction removal efficiency (%) = (Wi-Wo) / Wi×100%

[0042] Where: Wi-weight of expired food burned;

[0043] Wo - the sum of the weight of expired food in flue gas and incineration residue.

[0044] Organic sludge components

[0045] Moisture content / % Volatile organic matter / % pH organic sludge 63.8 36.2 6.84 Example 1

[0046] A method for co-processing expired food in a cement kiln, the operating steps of which are as follows:

[0047] S1: Use a shear crusher to crush expired food;

[0048] S2: Then it is mixed with the organic sludge in the silo in a certain proportion;

[0049] S3: Use a bucket to mix evenly and ferment for 3 days;

[0050] S4: The fermented material is transported by screw to the cement kiln for high-temperature incineration;

[0051] S5: After leaving the kiln, it enters the grate cooler for cooling, and the ash is used as cement clinker;

[0052] S6: After the incineration tail gas reaches the national emission standard through the exhaust gas purification device, it is discharged; the exhaust gas purification device is provided with an exhaust gas comprehensive monitoring system, and an exhaust gas flow meter is provided at the connection between the exhaust gas purification device and the auxiliary exhaust fan.

[0053] The crushed particle size is 100 mm.

[0054] The ratio of the sludge to the expired food is 8:1.

[0055] The temperature in the cement kiln is 1350° C. and the residence time is 30 minutes.

[0056] The cooling is to a temperature of 60°C.

[0057] The ash is mixed into cement clinker at a ratio of 5%.

[0058] The cement kiln tail gas collection device includes a spray tower, an adsorption dust collector and a main exhaust fan. The main exhaust fan is connected to the chimney. The main exhaust fan, the induced draft fan and the calcium hydroxide absorption tower and the adsorption dust collector are connected through pipelines. The adsorption dust collector is connected to the cement kiln tail gas outlet.

[0059] A 20% calcium hydroxide aqueous solution is introduced into the spray tower to spray the tail gas for carbonization reaction; the tail gas after spraying is then passed through an adsorption dust collector to continue absorbing carbon dioxide and carbon monoxide;

[0060] A carbon dioxide absorbing filler is added to the adsorption dust collector in an amount of 10% of the volume of the adsorption dust collector to reduce the content of carbon dioxide and carbon monoxide in the exhaust gas;

[0061] Packing filter plates are arranged in sequence at equal intervals in the adsorption dust collector to adsorb carbon dioxide and carbon monoxide. The interval between the packing filter plates is 0.4m. The exhaust gas after the spraying is passed from the bottom of the tower into the adsorption dust collector containing the packing filter plates. After the adsorption is completed, carbon dioxide and carbon monoxide are obtained. The exhaust gas with qualified emission is discharged through the chimney.

[0062] The preparation method of the carbon dioxide absorbing filler is as follows:

[0063] S1: Add 200 kg of hydroxyapatite, 20 kg of 3-isocyanate propylene, 2 kg of isobutyl titanate, and 1000 kg of DMF into a reactor, control the temperature at 60°C, and react for 2 hours;

[0064] S2: Add 20 kg of triethanolamine and 1 kg of dibutyltin dilaurate, mix and stir evenly, control the temperature to 60 ° C, and react for 50 minutes;

[0065] S3: Add 20 kg of the organic metal zinc material reaction solution and 1 kg of benzoyl peroxide, continue the reaction for 2 hours, filter, dry in an oven at 100° C. for 5 hours, and grind into a solid powder to obtain a carbon dioxide absorbing filler.

[0066] The preparation method of the organic metal zinc material is:

[0067] Weigh 10 kg of zinc nitrate, add 100 kg of methanol, and sonicate to dissolve it to obtain a zinc nitrate solution;

[0068] 2 kg of vinyl imidazole was weighed and stirred for 7 h under magnetic stirring at a stirring rate of 800 r / min to obtain an organometallic zinc material reaction solution. Example

[0069] A method for co-processing expired food in a cement kiln, the operating steps of which are as follows:

[0070] S1: Use a shear crusher to crush expired food;

[0071] S2: Then it is mixed with the organic sludge in the silo in a certain proportion;

[0072] S3: Use a bucket to mix evenly and ferment for 4 days;

[0073] S4: The fermented material is transported by screw to the cement kiln for high-temperature incineration;

[0074] S5: After leaving the kiln, it enters the grate cooler for cooling, and the ash is used as cement clinker;

[0075] S6: After the incineration tail gas reaches the national emission standard through the exhaust gas purification device, it is discharged; the exhaust gas purification device is provided with an exhaust gas comprehensive monitoring system, and an exhaust gas flow meter is provided at the connection between the exhaust gas purification device and the auxiliary exhaust fan.

[0076] The crushed particle size is 200 mm.

[0077] The ratio of the sludge to the expired food is 9:1.

[0078] The temperature in the cement kiln is 1400° C. and the residence time is 40 minutes.

[0079] The cooling is to a temperature of 70°C.

[0080] The ash is mixed into cement clinker at a ratio of 8%.

[0081] The cement kiln tail gas collection device includes a spray tower, an adsorption dust collector and a main exhaust fan. The main exhaust fan is connected to the chimney. The main exhaust fan, the induced draft fan and the calcium hydroxide absorption tower and the adsorption dust collector are connected through pipelines. The adsorption dust collector is connected to the cement kiln tail gas outlet.

[0082] A 25% calcium hydroxide aqueous solution is introduced into the spray tower to spray the tail gas for carbonization reaction; the tail gas after spraying is then passed through an adsorption dust collector to continue absorbing carbon dioxide and carbon monoxide;

[0083] A carbon dioxide absorbing filler is added to the adsorption dust collector in an amount of 15% of the volume of the adsorption dust collector to reduce the content of carbon dioxide and carbon monoxide in the exhaust gas;

[0084] Packing filter plates are arranged in sequence at equal intervals in the adsorption dust collector to adsorb carbon dioxide and carbon monoxide. The interval between the packing filter plates is 0.7m. The exhaust gas after the spraying is allowed to enter the adsorption dust collector containing the packing filter plates from the bottom of the tower. After the adsorption is completed, carbon dioxide and carbon monoxide are obtained. The exhaust gas with qualified emission is discharged through the chimney.

[0085] The preparation method of the carbon dioxide absorbing filler is as follows:

[0086] S1: Add 240 kg of hydroxyapatite, 24 kg of 3-isocyanate propylene, 3 kg of isobutyl titanate, and 1400 kg of DMF into a reactor, control the temperature at 65°C, and react for 3 hours;

[0087] S2: Add 30 kg of triethanolamine and 2 kg of dibutyltin dilaurate, mix and stir evenly, control the temperature to 65 ° C, and react for 80 minutes;

[0088] S3: Add 25 kg of the organic metal zinc material reaction solution and 2 kg of benzoyl peroxide, continue the reaction for 3 hours, filter, dry in an oven at 105° C. for 6 hours, and grind into a solid powder to obtain a carbon dioxide absorbing filler.

[0089] The preparation method of the organic metal zinc material is:

[0090] Weigh 12 kg of zinc nitrate, add 110 kg of methanol, and sonicate to dissolve it to obtain a zinc nitrate solution;

[0091] 3 kg of vinyl imidazole was weighed and stirred for 8 h under magnetic stirring at a stirring rate of 900 r / min to obtain an organometallic zinc material reaction solution. Example

[0092] A method for co-processing expired food in a cement kiln, the operating steps of which are as follows:

[0093] S1: Use a shear crusher to crush expired food;

[0094] S2: Then it is mixed with the organic sludge in the silo in a certain proportion;

[0095] S3: Use a grab bucket to mix evenly and ferment for 6 days;

[0096] S4: The fermented material is transported by screw to the cement kiln for high-temperature incineration;

[0097] S5: After leaving the kiln, it enters the grate cooler for cooling, and the ash is used as cement clinker;

[0098] S6: After the incineration tail gas reaches the national emission standard through the exhaust gas purification device, it is discharged; the exhaust gas purification device is provided with an exhaust gas comprehensive monitoring system, and an exhaust gas flow meter is provided at the connection between the exhaust gas purification device and the auxiliary exhaust fan.

[0099] The crushed particle size is 200 mm.

[0100] The ratio of the sludge to the expired food is 11:1.

[0101] The temperature in the cement kiln is 1450° C. and the residence time is 50 minutes.

[0102] The cooling is to a temperature of 80°C.

[0103] The ash is mixed into cement clinker at a ratio of 13%.

[0104] The cement kiln tail gas collection device includes a spray tower, an adsorption dust collector and a main exhaust fan. The main exhaust fan is connected to the chimney. The main exhaust fan, the induced draft fan and the calcium hydroxide absorption tower and the adsorption dust collector are connected through pipelines. The adsorption dust collector is connected to the cement kiln tail gas outlet.

[0105] A 25% calcium hydroxide aqueous solution is introduced into the spray tower to spray the tail gas for carbonization reaction; the tail gas after spraying is then passed through an adsorption dust collector to continue absorbing carbon dioxide and carbon monoxide;

[0106] A carbon dioxide absorbing filler is added to the adsorption dust collector in an amount of 15% of the volume of the adsorption dust collector to reduce the content of carbon dioxide and carbon monoxide in the exhaust gas;

[0107] Packing filter plates are arranged in sequence at equal intervals in the adsorption dust collector to adsorb carbon dioxide and carbon monoxide. The interval between the packing filter plates is 0.9m. The exhaust gas after the spraying is passed from the bottom of the tower into the adsorption dust collector containing the packing filter plates. After the adsorption is completed, carbon dioxide and carbon monoxide are obtained. The exhaust gas with qualified emission is discharged through the chimney.

[0108] The preparation method of the carbon dioxide absorbing filler is as follows:

[0109] S1: Add 280 kg of hydroxyapatite, 28 kg of 3-isocyanate propylene, 4 kg of isobutyl titanate, and 1800 kg of DMF into a reactor, control the temperature at 65°C, and react for 3 hours;

[0110] S2: Add 40 kg of triethanolamine and 3 kg of dibutyltin dilaurate, mix and stir evenly, control the temperature at 65 ° C, and react for 130 minutes;

[0111] S3: Add 30 kg of the organic metal zinc material reaction solution and 2 kg of benzoyl peroxide, continue the reaction for 4 hours, filter, dry in an oven at 115° C. for 8 hours, and grind into a solid powder to obtain a carbon dioxide absorbing filler.

[0112] The preparation method of the organic metal zinc material is:

[0113] Weigh 16 kg of zinc nitrate, add 120 kg of methanol, and sonicate to dissolve it to obtain a zinc nitrate solution;

[0114] 4 kg of vinyl imidazole was weighed and stirred for 10 h under magnetic stirring at a stirring rate of 1100 r / min to obtain an organometallic zinc material reaction solution. Example

[0115] A method for co-processing expired food in a cement kiln, the operating steps of which are as follows:

[0116] S1: Use a shear crusher to crush expired food;

[0117] S2: Then it is mixed with the organic sludge in the silo in a certain proportion;

[0118] S3: Use a grab bucket to mix evenly and ferment for 7 days;

[0119] S4: The fermented material is transported by screw to the cement kiln for high-temperature incineration;

[0120] S5: After leaving the kiln, it enters the grate cooler for cooling, and the ash is used as cement clinker;

[0121] S6: After the incineration tail gas reaches the national emission standard through the exhaust gas purification device, it is discharged; the exhaust gas purification device is provided with an exhaust gas comprehensive monitoring system, and an exhaust gas flow meter is provided at the connection between the exhaust gas purification device and the auxiliary exhaust fan.

[0122] The crushed particle size is 300 mm.

[0123] The ratio of the sludge to the expired food is 12:1.

[0124] The temperature in the cement kiln is 1500° C. and the residence time is 60 minutes.

[0125] The cooling is to a temperature of 85°C.

[0126] The ash is mixed into cement clinker at a ratio of 15%.

[0127] The cement kiln tail gas collection device includes a spray tower, an adsorption dust collector and a main exhaust fan. The main exhaust fan is connected to the chimney. The main exhaust fan, the induced draft fan and the calcium hydroxide absorption tower and the adsorption dust collector are connected through pipelines. The adsorption dust collector is connected to the cement kiln tail gas outlet.

[0128] A 30% calcium hydroxide aqueous solution is introduced into the spray tower to spray the tail gas for carbonization reaction; the tail gas after spraying is then passed through an adsorption dust collector to continue absorbing carbon dioxide and carbon monoxide;

[0129] A carbon dioxide absorbing filler is added to the adsorption dust collector in an amount of 20% of the volume of the adsorption dust collector to reduce the content of carbon dioxide and carbon monoxide in the exhaust gas;

[0130] Packing filter plates are arranged at equal intervals in the adsorption dust collector to adsorb carbon dioxide and carbon monoxide. The interval between the packing filter plates is 1.2m. The exhaust gas after the spraying is allowed to enter the adsorption dust collector containing the packing filter plates from the bottom of the tower. After the adsorption is completed, carbon dioxide and carbon monoxide are obtained. The exhaust gas with qualified emission is discharged through the chimney.

[0131] The preparation method of the carbon dioxide absorbing filler is as follows:

[0132] S1: Add 300 kg of hydroxyapatite, 30 kg of 3-isocyanate propylene, 5 kg of isobutyl titanate, and 2000 kg of DMF into a reactor, control the temperature at 70°C, and react for 4 hours;

[0133] S2: Add 50 kg of triethanolamine and 4 kg of dibutyltin dilaurate, mix and stir evenly, control the temperature to 70 ° C, and react for 150 minutes;

[0134] S3: Add 35 kg of the organic metal zinc material reaction solution and 3 kg of benzoyl peroxide, continue the reaction for 5 hours, filter, dry in an oven at 120° C. for 9 hours, and grind into a solid powder to obtain a carbon dioxide absorbing filler.

[0135] The preparation method of the organic metal zinc material is:

[0136] Weigh 18 kg of zinc nitrate, add 130 kg of methanol, and sonicate to dissolve it to obtain a zinc nitrate solution;

[0137] 5 kg of vinyl imidazole was weighed and stirred for 11 hours under magnetic stirring at a stirring rate of 1200 r / min to obtain an organometallic zinc material reaction solution.

[0138] Comparative Example 1

[0139] A method for co-processing expired food in a cement kiln, the operating steps of which are as follows:

[0140] S1: Use a shear crusher to crush expired food;

[0141] S2: Then it is mixed with the organic sludge in the silo in a certain proportion;

[0142] S3: Use a bucket to mix evenly and ferment for 3 days;

[0143] S4: The fermented material is transported by screw to the cement kiln for high-temperature incineration;

[0144] S5: After leaving the kiln, it enters the grate cooler for cooling, and the ash is used as cement clinker;

[0145] S6: After the incineration tail gas reaches the national emission standard through the exhaust gas purification device, it is discharged; the exhaust gas purification device is provided with an exhaust gas comprehensive monitoring system, and an exhaust gas flow meter is provided at the connection between the exhaust gas purification device and the auxiliary exhaust fan.

[0146] The crushed particle size is 100 mm.

[0147] The ratio of the sludge to the expired food is 8:1.

[0148] The temperature in the cement kiln is 1350° C. and the residence time is 30 minutes.

[0149] The cooling is to a temperature of 60°C.

[0150] The ash is mixed into cement clinker at a ratio of 5%.

[0151] The cement kiln tail gas collection device includes a spray tower, an adsorption dust collector and a main exhaust fan. The main exhaust fan is connected to the chimney. The main exhaust fan, the induced draft fan and the calcium hydroxide absorption tower and the adsorption dust collector are connected through pipelines. The adsorption dust collector is connected to the cement kiln tail gas outlet.

[0152] A 20% calcium hydroxide aqueous solution is introduced into the spray tower to spray the tail gas for carbonization reaction; the tail gas after spraying is then passed through an adsorption dust collector to continue absorbing carbon dioxide and carbon monoxide;

[0153] A carbon dioxide absorbing filler is added to the adsorption dust collector in an amount of 10% of the volume of the adsorption dust collector to reduce the content of carbon dioxide and carbon monoxide in the exhaust gas;

[0154] Packing filter plates are arranged in sequence at equal intervals in the adsorption dust collector to adsorb carbon dioxide and carbon monoxide. The interval between the packing filter plates is 0.4m. The exhaust gas after the spraying is passed from the bottom of the tower into the adsorption dust collector containing the packing filter plates. After the adsorption is completed, carbon dioxide and carbon monoxide are obtained. The exhaust gas with qualified emission is discharged through the chimney.

[0155] The preparation method of the carbon dioxide absorbing filler is as follows:

[0156] S1: Add 200 kg of hydroxyapatite, 20 kg of 3-isocyanate propylene, 2 kg of isobutyl titanate, and 1000 kg of DMF into a reactor, control the temperature at 60°C, and react for 2 hours;

[0157] S2: Add 20 kg of triethanolamine and 1 kg of dibutyltin dilaurate, mix and stir evenly, control the temperature to 60 ° C, and react for 50 minutes;

[0158] S3: The mixture after the reaction was filtered, dried in an oven at 100° C. for 5 h, and ground into solid powder to obtain a carbon dioxide absorbing filler.

[0159] Comparative Example 2

[0160] A method for co-processing expired food in a cement kiln, the operating steps of which are as follows:

[0161] S1: Use a shear crusher to crush expired food; S2: Then mix it with the organic sludge in the silo in a certain proportion;

[0162] S3: Use a bucket to mix evenly and ferment for 3 days;

[0163] S4: The fermented material is transported by screw to the cement kiln for high-temperature incineration;

[0164] S5: After leaving the kiln, it enters the grate cooler for cooling, and the ash is used as cement clinker;

[0165] S6: After the incineration tail gas reaches the national emission standard through the exhaust gas purification device, it is discharged; the exhaust gas purification device is provided with an exhaust gas comprehensive monitoring system, and an exhaust gas flow meter is provided at the connection between the exhaust gas purification device and the auxiliary exhaust fan.

[0166] The crushed particle size is 100 mm.

[0167] The ratio of the sludge to the expired food is 8:1.

[0168] The temperature in the cement kiln is 1350° C. and the residence time is 30 minutes.

[0169] The cooling is to a temperature of 60°C.

[0170] The ash is mixed into cement clinker at a ratio of 5%.

[0171] The cement kiln tail gas collection device includes a spray tower, an adsorption dust collector and a main exhaust fan. The main exhaust fan is connected to the chimney. The main exhaust fan, the induced draft fan and the calcium hydroxide absorption tower and the adsorption dust collector are connected through pipelines. The adsorption dust collector is connected to the cement kiln tail gas outlet.

[0172] A 20% calcium hydroxide aqueous solution is introduced into the spray tower to spray the tail gas for carbonization reaction; the tail gas after spraying is then passed through an adsorption dust collector to continue absorbing carbon dioxide and carbon monoxide;

[0173] A carbon dioxide absorbing filler is added to the adsorption dust collector in an amount of 10% of the volume of the adsorption dust collector to reduce the content of carbon dioxide and carbon monoxide in the exhaust gas;

[0174] Packing filter plates are arranged in sequence at equal intervals in the adsorption dust collector to adsorb carbon dioxide and carbon monoxide. The interval between the packing filter plates is 0.4m. The exhaust gas after the spraying is passed from the bottom of the tower into the adsorption dust collector containing the packing filter plates. After the adsorption is completed, carbon dioxide and carbon monoxide are obtained. The exhaust gas with qualified emission is discharged through the chimney.

[0175] The preparation method of the carbon dioxide absorbing filler is as follows:

[0176] S1: Add 200 kg of hydroxyapatite, 2 kg of isobutyl titanate, and 1000 kg of DMF into a reactor, control the temperature at 60°C, and react for 2 hours;

[0177] S2: Add 20 kg of triethanolamine and 1 kg of dibutyltin dilaurate, mix and stir evenly, control the temperature to 60 ° C, and react for 50 minutes;

[0178] S3: Add 20 kg of the organic metal zinc material reaction solution and 1 kg of benzoyl peroxide, continue the reaction for 2 hours, filter, dry in an oven at 100° C. for 5 hours, and grind into a solid powder to obtain a carbon dioxide absorbing filler.

[0179] The preparation method of the organic metal zinc material is:

[0180] Weigh 10 kg of zinc nitrate, add 100 kg of methanol, and sonicate to dissolve it to obtain a zinc nitrate solution;

[0181] 2 kg of vinyl imidazole was weighed and stirred for 7 h under magnetic stirring at a stirring rate of 800 r / min to obtain an organometallic zinc material reaction solution.

[0182] Comparative Example 3

[0183] A method for co-processing expired food in a cement kiln, the operating steps of which are as follows:

[0184] S1: Use a shear crusher to crush expired food;

[0185] S2: Then it is mixed with the organic sludge in the silo in a certain proportion;

[0186] S3: Use a bucket to mix evenly and ferment for 3 days;

[0187] S4: The fermented material is transported by screw to the cement kiln for high-temperature incineration;

[0188] S5: After leaving the kiln, it enters the grate cooler for cooling, and the ash is used as cement clinker;

[0189] S6: After the incineration tail gas reaches the national emission standard through the exhaust gas purification device, it is discharged; the exhaust gas purification device is provided with an exhaust gas comprehensive monitoring system, and an exhaust gas flow meter is provided at the connection between the exhaust gas purification device and the auxiliary exhaust fan.

[0190] The crushed particle size is 100 mm.

[0191] The ratio of the sludge to the expired food is 8:1.

[0192] The temperature in the cement kiln is 1350° C. and the residence time is 30 minutes.

[0193] The cooling is to a temperature of 60°C.

[0194] The ash is mixed into cement clinker at a ratio of 5%.

[0195] The cement kiln tail gas collection device includes a spray tower, an adsorption dust collector and a main exhaust fan. The main exhaust fan is connected to the chimney. The main exhaust fan, the induced draft fan and the calcium hydroxide absorption tower and the adsorption dust collector are connected through pipelines. The adsorption dust collector is connected to the cement kiln tail gas outlet.

[0196] A 20% calcium hydroxide aqueous solution is introduced into the spray tower to spray the tail gas for carbonization reaction; the tail gas after spraying is then passed through an adsorption dust collector to continue absorbing carbon dioxide and carbon monoxide;

[0197] A carbon dioxide absorbing filler is added to the adsorption dust collector in an amount of 10% of the volume of the adsorption dust collector to reduce the content of carbon dioxide and carbon monoxide in the exhaust gas;

[0198] Packing filter plates are arranged in sequence at equal intervals in the adsorption dust collector to adsorb carbon dioxide and carbon monoxide. The interval between the packing filter plates is 0.4m. The exhaust gas after the spraying is passed from the bottom of the tower into the adsorption dust collector containing the packing filter plates. After the adsorption is completed, carbon dioxide and carbon monoxide are obtained. The exhaust gas with qualified emission is discharged through the chimney.

[0199] The preparation method of the carbon dioxide absorbing filler is as follows:

[0200] S1: Add 200 kg of hydroxyapatite, 20 kg of 3-isocyanate propylene, and 1000 kg of DMF into a reactor, control the temperature at 60°C, and react for 2 hours;

[0201] S2: Add 20 kg of triethanolamine and 1 kg of dibutyltin dilaurate, mix and stir evenly, control the temperature to 60 ° C, and react for 50 minutes;

[0202] S3: Add 20 kg of the organic metal zinc material reaction solution and 1 kg of benzoyl peroxide, continue the reaction for 2 hours, filter, dry in an oven at 100° C. for 5 hours, and grind into a solid powder to obtain a carbon dioxide absorbing filler.

[0203] The preparation method of the organic metal zinc material is:

[0204] Weigh 10 kg of zinc nitrate, add 100 kg of methanol, and sonicate to dissolve it to obtain a zinc nitrate solution;

[0205] 2 kg of vinyl imidazole was weighed and stirred for 7 h under magnetic stirring at a stirring rate of 800 r / min to obtain an organometallic zinc material reaction solution.

[0206] Example test results:

[0207] Destruction and removal rate / % Carbon dioxide removal rate / % Carbon monoxide removal rate / % Example 1 99.95 99.99 99.99 Example 2 99.96 99.995 99.993 Example 3 99.99 99.999 99.995 Example 4 99.98 99.998 99.995 Comparative Example 1 85.37 82.63 80.29 Comparative Example 2 90.19 88.75 85.98 Comparative Example 3 93.64 90.69 89.13

[0208] It can be seen from the data of the above embodiments and comparative examples that the present invention can achieve the processing of large quantities of multiple types of expired food; under high-temperature incineration conditions, the organic matter in expired food can be completely decomposed, significantly improving the incineration efficiency; the carbon dioxide absorbing filler prepared by the present invention can significantly improve the adsorption effect of carbon dioxide.

[0209] It should be understood that the above-described specific embodiments of the present invention are merely illustrative or illustrative of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included within the scope of protection of the present invention. In addition, the appended claims are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. A method for co-processing expired food in a cement kiln, comprising the following steps: S1: Use a shear crusher to crush expired food; S2: Then mix it with the organic sludge in the silo in a certain proportion; the ratio of sludge to expired food is 8-12:1 S3: Use a grab bucket to mix evenly and ferment for 3-7 days; S4: The fermented material is transported by screw to the cement kiln for high-temperature incineration; S5: After leaving the kiln, it enters the grate cooler for cooling, and the ash is used as cement clinker; S6: After the incineration tail gas meets the national emission standards through the exhaust gas purification device, it is discharged into the air; the exhaust gas purification device is provided with an exhaust gas comprehensive monitoring system, and an exhaust gas flow meter is provided at the connection between the exhaust gas purification device and the auxiliary exhaust fan; The exhaust gas purification device includes a spray tower, an adsorption dust collector and a main exhaust fan, the main exhaust fan is connected to the chimney, the main exhaust fan, the induced draft fan, the calcium hydroxide absorption tower and the adsorption dust collector are connected through pipelines, and the adsorption dust collector is connected to the cement kiln exhaust outlet; A calcium hydroxide aqueous solution with a mass concentration of 20-30% is introduced into the spray tower to spray the tail gas for carbonization reaction; the tail gas after spraying is then passed through the adsorption dust collector to continue absorbing carbon dioxide and carbon monoxide; Adding carbon dioxide absorbing filler to the adsorption dust collector in an amount of 10-20% of the volume percentage of the adsorption dust collector to reduce the content of carbon dioxide and carbon monoxide in the tail gas; Filler filter plates are arranged in equal intervals in the adsorption dust collector to adsorb carbon dioxide and carbon monoxide. The spacing between the filler filter plates is 0.4-1.2m. The exhaust gas after spraying enters the adsorption dust collector containing the filler filter plates from the bottom of the tower. After the adsorption is completed, the exhaust gas with qualified carbon dioxide and carbon monoxide emissions is discharged through the chimney. The preparation method of the carbon dioxide absorbing filler is as follows: A1: Add 200-300 parts of hydroxyapatite, 20-30 parts of 3-isocyanate, 2-5 parts of isobutyl titanate, and 1000-2000 parts of DMF to a reactor, control the temperature at 60-70°C, and react for 2-4 hours. A2: Add 20-50 parts of triethanolamine and 1-4 parts of dibutyltin dilaurate, mix and stir evenly, control the temperature at 60-70°C, and react for 50-150 minutes; A3: Add 20-35 parts of the organometallic zinc material reaction solution and 1-3 parts of benzoyl peroxide, continue the reaction for 2-5 hours, filter, dry in an oven at 100-120°C for 5-9 hours, and grind into a solid powder to obtain a carbon dioxide absorbing filler; The preparation method of the organic metal zinc material is: Weigh 10-18 parts of zinc nitrate, add 100-130 parts of methanol, and sonicate to dissolve it to obtain a zinc nitrate solution; Then weigh 2-5 parts of vinyl imidazole, and stir for 7-11 hours under magnetic stirring at a stirring rate of 800-1200 r / min to obtain an organometallic zinc material reaction solution.

2. The method for co-processing expired food in a cement kiln according to claim 1, characterized in that: The crushed particle size is 100-300mm.

3. The method for co-processing expired food in a cement kiln according to claim 1, characterized in that: The temperature in the cement kiln is 1350-1500° C., and the residence time is 30-60 minutes.

4. The method for co-processing expired food in a cement kiln according to claim 1, characterized in that: Cool to a temperature of 60-85°C.

5. The method for co-processing expired food in a cement kiln according to claim 1, characterized in that: The ash is mixed into cement clinker at a ratio of 5-15%.