CN111692592B - Method for cooperatively treating household garbage by cement kiln - Google Patents

Method for cooperatively treating household garbage by cement kiln Download PDF

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CN111692592B
CN111692592B CN202010514869.3A CN202010514869A CN111692592B CN 111692592 B CN111692592 B CN 111692592B CN 202010514869 A CN202010514869 A CN 202010514869A CN 111692592 B CN111692592 B CN 111692592B
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garbage
particles
cement kiln
furnace
mixing
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CN111692592A (en
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赖卫鹤
黄敏锐
李春萍
江立平
唐柯
李贤忠
郭嘉诚
吴晨钰
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Zhejiang Hongshi Environmental Protection Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/033—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment comminuting or crushing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
    • F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
    • F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F23G5/46—Recuperation of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/50—Control or safety arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat

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Abstract

The invention relates to the field of environmental protection, in particular to a method for cooperatively treating household garbage by a cement kiln; the processing steps are as follows: carrying out leaching treatment, sorting, crushing, drying, extruding granulation and incineration; according to the invention, the cheap forming auxiliary agent obtained by modifying the waste plastics is added, so that the household garbage is changed into granular cement kiln fuel which is stable in heat value, uniform in quality, stable in components and easy to burn, the characteristics of high temperature, large residual heat amount, residue utilization and the like of the cement kiln are combined, the waste is dried by fully utilizing the residual heat of the cement kiln, the burned ash residues are used as cement production raw materials, and the household garbage is changed into valuable; according to the invention, through a two-stage incineration technology, firstly, garbage granules are subjected to high-temperature thermal decomposition in a low-oxygen environment, and then decomposed solids and gases are introduced into a combustion chamber for full combustion; the invention solves the problems of poor combustion effect of domestic garbage, poor tail gas emission quality, incomplete slag combustion and the like, and can not cause secondary pollution.

Description

Method for cooperatively treating household garbage by cement kiln
Technical Field
The invention relates to the field of environmental protection, in particular to a method for cooperatively treating household garbage by a cement kiln.
Background
With the continuous improvement of human living level and urbanization level, people generate more and more domestic garbage, the types of waste contained in the garbage are more and more, and the treatment of municipal garbage is more and more valued by the world environmental protection organization.
CN109539264A discloses a waste incineration equipment and waste incineration method, relate to the refuse treatment field, the spray gun of having solved current waste incineration equipment causes the influence and the problem that the filtration liquid backward flow caused the influence to other user's gas use easily to filtration liquid atomization effect when pressure is unstable, its technical scheme main points are that incineration equipment is including burning furnace, the frame of stewing, the collecting box of setting in the frame below of stewing, the spray gun, set up the water pump at the collecting box side, the feed liquor pipe, the trunk line, the gas holder, the intake pipe, the method includes: a. standing the garbage; b. standing the percolate; c. waste incineration; d. spraying percolate; e. premixing flue gas; f. percolate is retrieved, through add between trunk line and spray gun and establish the gas holder, can carry out pressure through the gas holder and store for percolate's atomizing is effectual, and percolate also can only flow into the gas holder after the nozzle blocks up, and can not flow into in the middle of the main line and cause the influence to other users.
CN107702111A provides a device that msw incineration boiler mud was burnt, includes: a sludge bin, a feeder, a plunger pump, a pipeline and an impurity remover; the sludge bin is used for storing sludge, and the bottom of the sludge bin is provided with the feeder; the feeder conveys sludge to the plunger pump, and the plunger pump conveys the sludge into a hearth of the waste incineration boiler through a pipeline; be equipped with the edulcoration ware between the export of plunger pump and the entry of pipeline, the inside filter screen that is equipped with of edulcoration ware, the impurity in the filter screen filtering mud. According to the invention, the sludge co-combustion is increased in the whole process of the garbage combustion by the garbage combustion furnace, so that the environmental pollution caused by sludge is reduced for the society, the sludge is uniformly added in the sludge co-combustion process, the pipeline is not blocked, the secondary air supply in the furnace is not influenced, and the stability of the combustion working condition in the furnace is improved.
CN103234205B discloses a garbage incinerator, which includes a furnace body, a grate disposed in the furnace body, and a stopper for preventing garbage from falling on the grate, wherein the stopper is provided with a through hole, and the stopper is disposed in the furnace body and above the grate. Through the arrangement of the blocking piece, newly thrown garbage can be placed on the blocking piece, so that the garbage cannot directly fall on the fire grate to extinguish the flame on the fire grate; moreover, the garbage can be dried and combusted on the blocking piece and then fall onto the fire grate through the through holes on the blocking piece to be combusted completely, so that the garbage can be combusted more fully.
The invention and the prior art only put the garbage into the incinerator after simple sorting, but the problems of poor combustion effect, insufficient oxygen supply, poor tail gas emission quality, incomplete slag combustion and secondary pollution are caused due to unstable garbage components, high water content, large combustion characteristic difference and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a method for cooperatively disposing domestic garbage by a cement kiln.
A method for cooperatively treating household garbage by a cement kiln mainly comprises the following steps:
firstly, domestic garbage is subjected to leaching treatment, and liquid seepage is preliminarily separated; then the obtained garbage enters a sorting system to sort the household garbage to be treated, and non-combustible hard materials such as metal, stones and the like in the garbage are sorted out; then, the sorted garbage enters a crushing system to be crushed, and the crushing lumpiness of the garbage is required to be 10-50 mm; the crushed garbage blocks enter a drying system, and the moisture content of the garbage blocks is dried to 10-25%; the dried garbage fragments enter a mixing bin, 2% -8% of forming auxiliary agent and 13% -25% of auxiliary fuel are added, the garbage fragments are fully and uniformly mixed and then enter granulation equipment for extrusion granulation, and the garbage particles are irregular particles with the particle size of 10-50 mm; the finished garbage particles enter a drying system again, and the moisture content of the garbage particles is dried to 1% -5%; finally, putting the obtained garbage particles into a pyrolysis furnace, wherein the decomposition furnace is divided into a negative pressure decomposition furnace and a combustion furnace, the temperature of the negative pressure decomposition furnace is 900-1100 ℃, and the oxygen concentration is 3-7%; the combustion furnace controls the decomposition temperature to be 1200-1500 ℃, and controls the oxygen concentration to be 13-18%; firstly, pyrolyzing the garbage particles in a negative pressure decomposing furnace, and then, feeding the garbage particles into a combustion furnace for decomposition; the slag ash obtained by decomposition is doped into cement raw materials, and the cement raw materials are used as production raw materials of cement clinker to enter a rotary kiln to be calcined at 1300-1500 ℃.
The forming auxiliary agent is obtained by modifying waste plastics, and silane-succinic starch is prepared by adopting vinyl tetramethyl disilane and sodium starch octenyl succinate;
the forming auxiliary agent is obtained by modifying waste plastics, and silane-succinic acid starch, zinc maleate and waste plastic particles are subjected to graft polymerization reaction in a molten state by extrusion;
the preparation method of the silane-succinic acid starch comprises the following steps:
according to the mass parts, 20-53 parts of vinyl tetramethyl disilane, 0.05-2 parts of platinum carbon catalyst and 355 parts of white oil with 300-25 parts of organic nitrogen protection are added into a reaction kettle, stirred for 100-200min, then 40-65 parts of sodium starch octenyl succinate are slowly added into a high-pressure reaction kettle, heated to 80-92 ℃, the pressure of the reaction kettle is controlled to be 0.5-1MPa, the reaction is carried out for 60-180min under the condition of heat preservation, the reaction is finished, the white oil is removed by vacuum distillation, and the silane-starch succinate is obtained after filtration and drying;
the step is a hydrosilylation reaction, wherein partial reaction is shown as follows:
Figure DEST_PATH_IMAGE001
adding 180-255 parts of waste plastic particles, 2-7 parts of silane-succinic acid starch, 0.2-0.7 part of diisopropyl peroxydicarbonate and 10-20 parts of zinc maleate into a high-speed mixing kettle according to the mass parts, controlling the temperature to be 40-60 ℃, stirring and mixing at a high speed for 30-60min, then adding 5-15 parts of polyethylene wax into the mixing kettle, continuously mixing for 10-20min, taking out and putting into an extruder after the mixing is finished, and obtaining a forming aid after extrusion granulation;
the silane-succinic acid starch, the zinc maleate and the waste plastic particles are subjected to graft polymerization reaction in several extrusion molten states, wherein partial reaction is shown as follows:
Figure 834419DEST_PATH_IMAGE002
Figure DEST_PATH_IMAGE003
the waste plastic particles comprise 40-55% of waste plastic bottle particles, 10-15% of waste greenhouse film granules, 12-20% of waste pipe granules and the other components are waste foamed granules.
The granulating equipment is a single-screw extrusion granulator or a double-screw extrusion granulator.
And the flue gas generated by pyrolysis in the negative pressure decomposing furnace enters the combustion furnace through the high-pressure fan to be fully combusted.
The auxiliary fuel is coal or heavy oil or coke.
The slag ash obtained by decomposition is doped into the cement raw material according to the proportion of 10-25%.
The heat in the cement kiln flue tail gas supplies heat for the garbage drying system.
The temperature in the granulating equipment is 80-120 ℃.
According to the method for treating the household garbage with the cement kiln in a synergistic manner, the household garbage is changed into granular cement kiln fuel which is stable in heat value, uniform in quality, stable in components and easy to burn by adding the cheap forming aid obtained by modifying the waste plastics, the waste is dried by fully utilizing the waste heat of the cement kiln by combining the characteristics of high temperature, large waste heat amount, residue utilization and the like of the cement kiln, the burned ash is used as a cement production raw material, and the household garbage is changed into valuable; according to the invention, through a two-stage incineration technology, firstly, garbage granules are subjected to high-temperature thermal decomposition in a low-oxygen environment, and then decomposed solids and gases are introduced into a combustion chamber for full combustion; the invention solves the problems of poor combustion effect of domestic garbage, poor tail gas emission quality, incomplete slag combustion and the like, and can not cause secondary pollution.
Drawings
FIG. 1 is a Fourier infrared spectrum of a sample of the silane-starch succinate prepared in example 2.
At 1732cm-1An absorption peak of the ester carbonyl group at 1136cm is present in the vicinity-1An absorption peak of ester carbon-oxygen single bond exists nearby and is 1067cm-1An absorption peak of ether at 3328cm was observed in the vicinity of the peak-1An absorption peak of hydroxyl exists nearby, which indicates that sodium starch octenyl succinate participates in the reaction; at 2964cm-1The expansion and contraction absorption peak of hydrocarbon exists nearby, and is 729cm-1The stretching absorption peak of silicon carbon exists nearby and is 1030/865cm-1The antisymmetric/symmetric telescopic absorption peak of silicon oxygen exists nearby, which indicates that the vinyl tetramethyl disilane participates in the reaction.
Detailed Description
The invention is further illustrated by the following specific examples:
the experiment measures the content of smoke dust and the content of dioxin and furan in the burned smoke according to the Chinese standard GWKB 3-2000.
Example 1
A method for cooperatively treating household garbage by a cement kiln mainly comprises the following steps:
firstly, domestic garbage is subjected to leaching treatment, and liquid seepage is preliminarily separated; then the obtained garbage enters a sorting system to sort the household garbage to be treated, and non-combustible hard materials such as metal, stones and the like in the garbage are sorted out; then, the sorted garbage enters a crushing system to be crushed, and the crushing lumpiness of the garbage is required to be 10 mm; the crushed garbage blocks enter a drying system, and the moisture content of the garbage blocks is dried to 10%; the dried garbage fragments enter a mixing bin, 2% of forming aid and 13% of auxiliary fuel are added, the garbage fragments are fully and uniformly mixed and then enter granulation equipment for extrusion granulation, and the garbage particles are irregular particles with the particle size of 10 mm; the finished garbage particles enter a drying system again, and the moisture content of the garbage particles is dried to 1%; finally, putting the obtained garbage particles into a pyrolysis furnace, wherein the pyrolysis furnace is divided into a negative pressure pyrolysis furnace and a combustion furnace, the temperature of the negative pressure pyrolysis furnace is 900 ℃, and the oxygen concentration is 3%; the combustion furnace controls the decomposition temperature to be 1200 ℃ and controls the oxygen concentration to be 13%; firstly, pyrolyzing the garbage particles in a negative pressure decomposing furnace, and then, feeding the garbage particles into a combustion furnace for decomposition; the slag ash obtained by decomposition is doped into cement raw materials, and the cement raw materials are used as production raw materials of cement clinker to enter a rotary kiln to be calcined at 1300 ℃.
The preparation method of the silane-succinic acid starch comprises the following steps:
adding 20kg of vinyl tetramethyl disilane and 0.05kg of platinum-carbon catalyst into a reaction kettle, stirring for 100min under the protection of nitrogen, slowly adding 40kg of sodium starch octenyl succinate into a high-pressure reaction kettle, heating to 80 ℃, controlling the pressure of the reaction kettle to be 0.5MPa, carrying out heat preservation reaction for 60min, finishing the reaction, carrying out vacuum distillation to remove white oil, filtering and drying to obtain silane-starch succinate;
adding 180kg of waste plastic particles, 2kg of silane-succinic acid starch, 0.2kg of diisopropyl peroxydicarbonate and 10kg of zinc maleate into a high-speed mixing kettle, controlling the temperature to be 40 ℃, stirring and mixing at a high speed for 30min, then adding 5kg of polyethylene wax into the mixing kettle, continuously mixing for 10min, taking out the mixture after the mixing is finished, putting the mixture into an extruder, and extruding and granulating to obtain a forming aid;
the granulating equipment is a single-screw extrusion granulator.
And the flue gas generated by pyrolysis in the negative pressure decomposing furnace enters the combustion furnace through the high-pressure fan to be fully combusted.
The auxiliary fuel is coal.
The slag ash obtained by decomposition is mixed into the cement raw meal according to the proportion of 10%.
The heat in the cement kiln flue tail gas supplies heat for the garbage drying system.
The temperature in the granulation equipment is 80 ℃.
The smoke content in the flue gas after incineration in the experiment was 0.89mg/m3The content of dioxin and furan is 0.012ng/m3。
Example 2
A method for cooperatively treating household garbage by a cement kiln mainly comprises the following steps:
firstly, domestic garbage is subjected to leaching treatment, and liquid seepage is preliminarily separated; then the obtained garbage enters a sorting system to sort the household garbage to be treated, and non-combustible hard materials such as metal, stones and the like in the garbage are sorted out; then, the sorted garbage enters a crushing system to be crushed, and the crushing lumpiness of the garbage is required to be 30 mm; the crushed garbage blocks enter a drying system, and the moisture content of the garbage blocks is dried to 15%; the dried garbage fragments enter a mixing bin, 6% of forming aid and 18% of auxiliary fuel are added, the garbage fragments are fully and uniformly mixed and then enter granulation equipment for extrusion granulation, and the garbage particles are irregular particles with the particle size of 30 mm; the finished garbage particles enter a drying system again, and the moisture content of the garbage particles is dried to 3%; finally, putting the obtained garbage particles into a pyrolysis furnace, wherein the pyrolysis furnace is divided into a negative pressure pyrolysis furnace and a combustion furnace, the temperature of the negative pressure pyrolysis furnace is 1000 ℃, and the oxygen concentration is 5%; the combustion furnace controls the decomposition temperature to be 1400 ℃ and controls the oxygen concentration to be 15 percent; firstly, pyrolyzing the garbage particles in a negative pressure decomposing furnace, and then, feeding the garbage particles into a combustion furnace for decomposition; the slag ash obtained by decomposition is doped into cement raw materials, and the cement raw materials are used as production raw materials of cement clinker to enter a rotary kiln to be calcined at 1400 ℃.
The preparation method of the silane-succinic acid starch comprises the following steps:
adding 29kg of vinyl tetramethyl disilane, 0.1kg of platinum-carbon catalyst and 325kg of white oil into a reaction kettle, stirring for 120min under the protection of nitrogen, slowly adding 46kg of sodium starch octenyl succinate into a high-pressure reaction kettle, heating to 83 ℃, controlling the pressure of the reaction kettle to be 0.6MPa, carrying out heat preservation reaction for 90min, finishing the reaction, carrying out vacuum distillation to remove the white oil, filtering and drying to obtain silane-starch succinate;
adding 194kg of waste plastic particles, 4kg of silane-succinic acid starch, 0.6kg of diisopropyl peroxydicarbonate and 15kg of zinc maleate into a high-speed mixing kettle, controlling the temperature to be 45 ℃, stirring and mixing at a high speed for 52min, then adding 10kg of polyethylene wax into the mixing kettle, continuously mixing for 14min, taking out the mixture after the mixing is finished, putting the mixture into an extruder, and extruding and granulating to obtain a forming aid;
the granulating equipment is a double-screw extrusion granulator.
And the flue gas generated by pyrolysis in the negative pressure decomposing furnace enters the combustion furnace through the high-pressure fan to be fully combusted.
The auxiliary fuel is heavy oil.
The slag ash obtained by decomposition is mixed into the cement raw materials according to the proportion of 15 percent.
The heat in the cement kiln flue tail gas supplies heat for the garbage drying system.
The temperature in the granulation equipment is 100 ℃.
The smoke content in the smoke after the incineration in the experiment is 0.84mg/m3The content of dioxin and furan is 0.008ng/m3。
Example 3
A method for cooperatively treating household garbage by a cement kiln mainly comprises the following steps:
firstly, domestic garbage is subjected to leaching treatment, and liquid seepage is preliminarily separated; then the obtained garbage enters a sorting system to sort the household garbage to be treated, and non-combustible hard materials such as metal, stones and the like in the garbage are sorted out; then, the sorted garbage enters a crushing system to be crushed, and the crushing lumpiness of the garbage is required to be 50 mm; the crushed garbage blocks enter a drying system, and the moisture content of the garbage blocks is dried to 25%; the dried garbage fragments enter a mixing bin, 8% of forming aid and 25% of auxiliary fuel are added, the garbage fragments are fully and uniformly mixed and then enter granulation equipment for extrusion granulation, and the garbage particles are irregular particles with the particle size of 50 mm; the finished garbage particles enter a drying system again, and the moisture content of the garbage particles is dried to 5%; finally, putting the obtained garbage particles into a pyrolysis furnace, wherein the pyrolysis furnace is divided into a negative pressure pyrolysis furnace and a combustion furnace, the temperature of the negative pressure pyrolysis furnace is 1100 ℃, and the oxygen concentration is 7%; the combustion furnace controls the decomposition temperature to be 1500 ℃ and controls the oxygen concentration to be 18 percent; firstly, pyrolyzing the garbage particles in a negative pressure decomposing furnace, and then, feeding the garbage particles into a combustion furnace for decomposition; the slag ash obtained by decomposition is doped into cement raw materials, and the cement raw materials are used as production raw materials of cement clinker to enter a rotary kiln to be calcined at 1500 ℃.
The preparation method of the silane-succinic acid starch comprises the following steps:
adding 53kg of vinyl tetramethyl disilane, 2kg of platinum-carbon catalyst and 355kg of white oil into a reaction kettle, stirring for 200min under the protection of nitrogen, then slowly adding 65kg of sodium starch octenyl succinate into a high-pressure reaction kettle, heating to 92 ℃, controlling the pressure of the reaction kettle to be 1MPa, carrying out heat preservation reaction for 180min, after the reaction is finished, carrying out vacuum distillation to remove the white oil, filtering and drying to obtain silane-starch succinate;
adding 255kg of waste plastic particles, 7kg of silane-succinic acid starch, 0.7kg of diisopropyl peroxydicarbonate and 20kg of zinc maleate into a high-speed mixing kettle, controlling the temperature to be 60 ℃, stirring and mixing at a high speed for 60min, then adding 15kg of polyethylene wax into the mixing kettle, continuously mixing for 20min, taking out the mixture after the mixing is finished, putting the mixture into an extruder, and extruding and granulating to obtain a forming aid;
the granulating equipment is a single-screw extrusion granulator.
And the flue gas generated by pyrolysis in the negative pressure decomposing furnace enters the combustion furnace through the high-pressure fan to be fully combusted.
The auxiliary fuel is coke.
The slag ash obtained by decomposition is mixed into the cement raw materials according to the proportion of 25 percent.
The heat in the cement kiln flue tail gas supplies heat for the garbage drying system.
The temperature in the granulation equipment is 120 ℃.
The smoke content in the smoke after incineration in the experiment is 0.82mg/m3The content of dioxin and furan is 0.007ng/m3。
Comparative example 1
A method for cooperatively treating household garbage by a cement kiln mainly comprises the following steps:
a method for cooperatively treating household garbage by a cement kiln mainly comprises the following steps:
firstly, domestic garbage is subjected to leaching treatment, and liquid seepage is preliminarily separated; then the obtained garbage enters a sorting system to sort the household garbage to be treated, and non-combustible hard materials such as metal, stones and the like in the garbage are sorted out; then, the sorted garbage enters a crushing system to be crushed, and the crushing lumpiness of the garbage is required to be 10 mm; the crushed garbage blocks enter a drying system, and the moisture content of the garbage blocks is dried to 10%; the dried garbage fragments enter a mixing bin, 2% of forming aid and 13% of auxiliary fuel are added, the garbage fragments are fully and uniformly mixed and then enter granulation equipment for extrusion granulation, and the garbage particles are irregular particles with the particle size of 10 mm; the finished garbage particles enter a drying system again, and the moisture content of the garbage particles is dried to 1%; finally, putting the obtained garbage particles into a pyrolysis furnace, wherein the pyrolysis furnace is divided into a negative pressure pyrolysis furnace and a combustion furnace, the temperature of the negative pressure pyrolysis furnace is 900 ℃, and the oxygen concentration is 3%; the combustion furnace controls the decomposition temperature to be 1200 ℃ and controls the oxygen concentration to be 13%; firstly, pyrolyzing the garbage particles in a negative pressure decomposing furnace, and then, feeding the garbage particles into a combustion furnace for decomposition; the slag ash obtained by decomposition is doped into cement raw materials, and the cement raw materials are used as production raw materials of cement clinker to enter a rotary kiln to be calcined at 1300 ℃.
Adding 180kg of waste plastic particles, 2kg of silane-succinic acid starch, 0.2kg of diisopropyl peroxydicarbonate and 10kg of zinc maleate into a high-speed mixing kettle, controlling the temperature to be 40 ℃, stirring and mixing at a high speed for 30min, then adding 5kg of polyethylene wax into the mixing kettle, continuously mixing for 10min, taking out the mixture after the mixing is finished, putting the mixture into an extruder, and extruding and granulating to obtain a forming aid;
the granulating equipment is a single-screw extrusion granulator.
And the flue gas generated by pyrolysis in the negative pressure decomposing furnace enters the combustion furnace through the high-pressure fan to be fully combusted.
The slag ash obtained by decomposition is mixed into the cement raw meal according to the proportion of 10%.
The heat in the cement kiln flue tail gas supplies heat for the garbage drying system.
The temperature in the granulation equipment is 80 ℃.
The smoke content in the smoke after incineration in the experiment is 12.42mg/m3The content of dioxin and furan is 0.624ng/m3。
Comparative example 2
A method for cooperatively treating household garbage by a cement kiln mainly comprises the following steps:
firstly, domestic garbage is subjected to leaching treatment, and liquid seepage is preliminarily separated; then the obtained garbage enters a sorting system to sort the household garbage to be treated, and non-combustible hard materials such as metal, stones and the like in the garbage are sorted out; then, the sorted garbage enters a crushing system to be crushed, and the crushing lumpiness of the garbage is required to be 10 mm; the crushed garbage blocks enter a drying system, and the moisture content of the garbage blocks is dried to 10%; the dried garbage fragments enter a mixing bin, 2% of forming aid and 13% of auxiliary fuel are added, the garbage fragments are fully and uniformly mixed and then enter granulation equipment for extrusion granulation, and the garbage particles are irregular particles with the particle size of 10 mm; the finished garbage particles enter a drying system again, and the moisture content of the garbage particles is dried to 1%; finally, putting the obtained garbage particles into a pyrolysis furnace, wherein the pyrolysis furnace is divided into a negative pressure pyrolysis furnace and a combustion furnace, the temperature of the negative pressure pyrolysis furnace is 900 ℃, and the oxygen concentration is 3%; the combustion furnace controls the decomposition temperature to be 1200 ℃ and controls the oxygen concentration to be 13%; firstly, pyrolyzing the garbage particles in a negative pressure decomposing furnace, and then, feeding the garbage particles into a combustion furnace for decomposition; the slag ash obtained by decomposition is doped into cement raw materials, and the cement raw materials are used as production raw materials of cement clinker to enter a rotary kiln to be calcined at 1300 ℃.
The preparation method of the silane-succinic acid starch comprises the following steps:
adding 20kg of vinyl tetramethyl disilane and 0.05kg of platinum-carbon catalyst into a reaction kettle, stirring for 100min under the protection of nitrogen, slowly adding 40kg of sodium starch octenyl succinate into a high-pressure reaction kettle, heating to 80 ℃, controlling the pressure of the reaction kettle to be 0.5MPa, carrying out heat preservation reaction for 60min, finishing the reaction, carrying out vacuum distillation to remove white oil, filtering and drying to obtain silane-starch succinate;
adding 180kg of waste plastic particles, 2kg of silane-succinic acid starch and 0.2kg of diisopropyl peroxydicarbonate into a high-speed mixing kettle, controlling the temperature to be 40 ℃, stirring and mixing at a high speed for 30min, then adding 5kg of polyethylene wax into the mixing kettle, continuously mixing for 10min, taking out the mixture after the mixing is finished, putting the mixture into an extruder, and performing extrusion granulation to obtain a forming aid;
the granulating equipment is a single-screw extrusion granulator.
And the flue gas generated by pyrolysis in the negative pressure decomposing furnace enters the combustion furnace through the high-pressure fan to be fully combusted.
The auxiliary fuel is coal.
The slag ash obtained by decomposition is mixed into the cement raw meal according to the proportion of 10%.
The heat in the cement kiln flue tail gas supplies heat for the garbage drying system.
The temperature in the granulation equipment is 80 ℃.
The smoke content in the smoke after incineration in the experiment is 10.11mg/m3The content of dioxin and furan is 0.517ng/m3。
Comparative example 3
A method for cooperatively treating household garbage by a cement kiln mainly comprises the following steps:
firstly, domestic garbage is subjected to leaching treatment, and liquid seepage is preliminarily separated; then the obtained garbage enters a sorting system to sort the household garbage to be treated, and non-combustible hard materials such as metal, stones and the like in the garbage are sorted out; then, the sorted garbage enters a crushing system to be crushed, and the crushing lumpiness of the garbage is required to be 10 mm; the crushed garbage blocks enter a drying system, and the moisture content of the garbage blocks is dried to 10%; the dried garbage fragments enter a mixing bin, 13% of auxiliary fuel is fully and uniformly mixed and then enters granulation equipment for extrusion granulation, and the garbage particles are irregular particles with the particle size of 10 mm; the finished garbage particles enter a drying system again, and the moisture content of the garbage particles is dried to 1%; finally, putting the obtained garbage particles into a pyrolysis furnace, wherein the pyrolysis furnace is divided into a negative pressure pyrolysis furnace and a combustion furnace, the temperature of the negative pressure pyrolysis furnace is 900 ℃, and the oxygen concentration is 3%; the combustion furnace controls the decomposition temperature to be 1200 ℃ and controls the oxygen concentration to be 13%; firstly, pyrolyzing the garbage particles in a negative pressure decomposing furnace, and then, feeding the garbage particles into a combustion furnace for decomposition; the slag ash obtained by decomposition is doped into cement raw materials, and the cement raw materials are used as production raw materials of cement clinker to enter a rotary kiln to be calcined at 1300 ℃.
The granulating equipment is a single-screw extrusion granulator.
And the flue gas generated by pyrolysis in the negative pressure decomposing furnace enters the combustion furnace through the high-pressure fan to be fully combusted.
The auxiliary fuel is coal.
The slag ash obtained by decomposition is mixed into the cement raw meal according to the proportion of 10%.
The heat in the cement kiln flue tail gas supplies heat for the garbage drying system.
The temperature in the granulation equipment is 80 ℃.
The smoke content in the smoke after incineration in the experiment is 102.36mg/m3The content of dioxin and furan is 5.63ng/m3。

Claims (7)

1. A method for cooperatively treating household garbage by a cement kiln is characterized by comprising the following steps:
firstly, domestic garbage is subjected to leaching treatment, and liquid seepage is preliminarily separated; then the obtained garbage enters a sorting system to sort the household garbage to be treated, and non-combustible hard materials such as metal, stones and the like in the garbage are sorted out; then, the sorted garbage enters a crushing system to be crushed, and the crushing lumpiness of the garbage is required to be 10-50 mm; the crushed garbage blocks enter a drying system, and the moisture content of the garbage blocks is dried to 10-25%; feeding the dried garbage fragments into a mixing bin, adding 2-8% of forming aid and 13-25% of auxiliary fuel, fully and uniformly mixing, and feeding into granulation equipment for extrusion granulation to obtain garbage particles, wherein the garbage particles are irregular particles with the particle size of 10-50 mm; the finished garbage particles enter a drying system again, and the moisture content of the garbage particles is dried to 1% -5%; finally, putting the obtained garbage particles into a pyrolysis furnace, wherein the pyrolysis furnace is divided into a negative pressure decomposition furnace and a combustion furnace, the temperature of the negative pressure decomposition furnace is 900-1100 ℃, and the oxygen concentration is 3-7%; the combustion furnace controls the decomposition temperature to be 1200-1500 ℃, and controls the oxygen concentration to be 13-18%; firstly, pyrolyzing the garbage particles in a negative pressure decomposing furnace, and then, feeding the garbage particles into a combustion furnace for decomposition; mixing the decomposed slag ash with cement raw materials, feeding the slag ash serving as a production raw material of cement clinker into a rotary kiln, and calcining at 1300-1500 ℃;
the forming auxiliary agent is obtained by modifying waste plastics, and silane-succinic acid starch prepared by vinyl tetramethyl disilane and sodium starch octenyl succinate is used as a raw material;
the preparation method of the silane-succinic acid starch comprises the following steps:
according to the mass parts, 20-53 parts of vinyl tetramethyl disilane, 0.05-2 parts of platinum carbon catalyst and 355 parts of white oil with 300-25 parts of organic nitrogen protection are added into a reaction kettle, stirred for 100-200min, then 40-65 parts of sodium starch octenyl succinate are slowly added into a high-pressure reaction kettle, heated to 80-92 ℃, the pressure of the reaction kettle is controlled to be 0.5-1MPa, the reaction is carried out for 60-180min under the condition of heat preservation, the reaction is finished, the white oil is removed by vacuum distillation, and the silane-starch succinate is obtained after filtration and drying;
the forming assistant is obtained by modifying waste plastics, and the preparation method comprises the following steps:
adding 180-255 parts of waste plastic particles, 2-7 parts of silane-succinic acid starch, 0.2-0.7 part of diisopropyl peroxydicarbonate and 10-20 parts of zinc maleate into a high-speed mixing kettle according to the mass parts, controlling the temperature to be 40-60 ℃, stirring and mixing at a high speed for 30-60min, then adding 5-15 parts of polyethylene wax into the mixing kettle, continuously mixing for 10-20min, taking out and putting into an extruder after the mixing is finished, and obtaining the forming aid after extrusion granulation.
2. The method for the cement kiln to dispose domestic garbage in coordination with the claim 1, wherein: the granulating equipment is a single-screw extrusion granulator or a double-screw extrusion granulator.
3. The method for the cement kiln to dispose domestic garbage in coordination with the claim 1, wherein: and the flue gas generated by pyrolysis in the negative pressure decomposing furnace enters the combustion furnace through the high-pressure fan to be fully combusted.
4. The method for the cement kiln to dispose domestic garbage in coordination with the claim 1, wherein: the auxiliary fuel is coal or heavy oil or coke.
5. The method for the cement kiln to dispose domestic garbage in coordination with the claim 1, wherein: the slag ash obtained by decomposition is doped into the cement raw material according to the proportion of 10-25%.
6. The method for the cement kiln to dispose domestic garbage in coordination with the claim 1, wherein: the heat in the cement kiln flue tail gas supplies heat for the garbage drying system.
7. The method for the cement kiln to dispose domestic garbage in coordination with the claim 1, wherein: the temperature in the granulating equipment is 80-120 ℃.
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CN113214881B (en) * 2021-04-26 2022-04-26 浙江红狮环保股份有限公司 Method for co-processing oil-containing waste packaging materials by adopting cement kiln
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WO2006074907A1 (en) * 2005-01-14 2006-07-20 Ecodeco S.R.L. Device for feeding refuse-derived fuels (rdf) to combustion apparatuses
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