CN101737784B - Method for mixed burning of agriculture and forestry waste, sludge and household garbage by using grate furnace - Google Patents
Method for mixed burning of agriculture and forestry waste, sludge and household garbage by using grate furnace Download PDFInfo
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- CN101737784B CN101737784B CN2010100171473A CN201010017147A CN101737784B CN 101737784 B CN101737784 B CN 101737784B CN 2010100171473 A CN2010100171473 A CN 2010100171473A CN 201010017147 A CN201010017147 A CN 201010017147A CN 101737784 B CN101737784 B CN 101737784B
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Abstract
The invention relates to the technical field of energy environmental engineering and provides a method for mixed burning of agriculture and forestry waste, sludge and household garbage by using a grate furnace. The method comprises burning the agriculture and forestry waste, sludge and household garbage in a grate garbage burning furnace, igniting by using agriculture and forestry waste, and adding household garbage and sludge in the furnace to realize mixed burning when the temperature of the furnace rises to 850 DEG C, wherein the mass percent of the agriculture and forestry in the mixed fuel is within 40 percent, the mass percent of sludge in the mixed fuel is within 30 percent, the burning temperature of the grate burning furnace is controlled at 850 to 1000 DEG C, and the smoke gas generated by burning stayed in the furnace is controlled above two seconds. The invention is low in the cost, improves the burning efficiency of the garbage burning furnace, solves the problem of pollution caused by the sludge, ensures that the agriculture and forestry waste can be recycled, reduces discharge of pollutants, particularly heavy metal and dioxin and reduces the consumption of fossil energy.
Description
Technical field
The invention belongs to the energy environment field of engineering technology, be specifically related to a kind of method of utilizing the grate furnace mixed burning to handle agriculture and forestry organic waste material, mud and domestic waste.
Background technology
At present, country advocates and the encourage growth recycling economy energetically, and energy savings, Renewable Energy Development are built a conservation-minded society.
China's domestic waste amount of clearing had reached 1.74 hundred million tons in 2008, and the quick growth of municipal refuse has become four overall situation that current China faces and one of polluted.Burning method is handled domestic waste can effectively realize innoxious, minimizing and resource, is the technology path of domestic and international wide popularization and application.But because at present China's domestic waste calorific value is low, moisture is high, refuse thermal value is very big with seasonal variety, cause the difficulty of catching fire when in incinerator, burning, after-flame degree low, burn operating mode instability and decrement capacity reducing weak effect.Incineration treatment of garbage enterprise often needs to add a certain amount of coal and domestic waste multifuel combustion or spray into fuel oil in burner hearth combustion-supporting, to reach the garbage disposal effect and the discharge index of expection.
Mud output in sewage disposal process is huge, and according to current technology, the mud generation is 0.3% ~ 0.5% of a sewage load.And according to incompletely statistics, the annual wet mud that produces of wastewater treatment in China factory is about 9,000,000 tons at present, estimates that will produce 27,000,000 tons in wet mud every year in the five-year.Mud normally contains the thin mud of 98% moisture, and very easily corrupt, its solid constituent 70%-80% is an organic substance, and comprise oil, fat and a large amount of different types of pollutants, but also contain a large amount of metal ingredients, as copper, zinc, mercury etc.Analyze from quantity and harm, the Treatment of Sludge disposal focuses on moisture, organic matter, heavy metal, is easy to generate secondary pollution as mishandling.The processing mode of mud mainly comprises landfill, farmland utilization, compost, fills out sea and burning etc.The sludge incineration generating is handled and can be reached the inaccessiable minimizing of other modes, innoxious and resource effect, has become the dominant direction that recycling sludge utilizes.
Sludge incineration mainly can be divided into two big classes: a class is directly to send incinerator to burn dewatered sludge, usually moisture percentage in sewage sludge is up to more than 98%, dehydration back moisture content is about 80%, thereby calorific value is improved to some extent, but still can not reach from the degree of keeping burning, usually need to add a certain amount of coal and mud multifuel combustion, with raising sludge incineration efficient, reduce pollutant emission, but consumed precious resources such as coal simultaneously.Another kind of is directly to burn behind the deeply dehydrating sludge again, but the deep dehydration cost is too high, has directly improved the Treatment of Sludge cost.
The development of fire grate incineration technology is comparatively ripe, and is different and various informative with motion mode according to the structure of fire grate, but the basic principle of burning is roughly the same.Rubbish carries out layer combustion on fire grate, successively by preheating and drying district, primary zone and burnt zone, last lime-ash discharges out of the furnace.Various fire grates all can be taked different modes to make the rubbish bed of material constantly obtain loosening and rubbish is fully contacted with air, thereby reach comparatively ideal combustion efficiency.
Grate furnace is lower to the pre-treatment requirement of rubbish, and the storing feeding system is ripe simple; In the combustion process, by fire grate vibration in the stove, throw or mode such as upset, realize the abundant burning of rubbish, can in combustion process, add solid or the liquid auxiliary fuel combustion-supporting, also maturation comparatively of CIU at present; In addition, grate furnace slagging-off system stability; Combustion process is stable, and control is simple.
But the fire grate incineration technology is suitable for the higher rubbish of incinerating combustion value, and efficiency of combustion is lower, and steam production is low, when using the rubbish of low heat value, high-moisture, for guaranteeing that boiler reaches the technological parameter that needs when the normal combustion, must add combustion-supporting oil, operating cost is higher.
Agriculture and forestry organic waste material is the byproduct of agricultural and production of forestry, and output is big, distribution is wide, is a kind of important renewable and clear energy sources.The output of the annual agricultural wastes of China reaches 7.5 hundred million tons, mainly comprises rice straw, straw, cornstalk, cotton stalk, rice husk and peanut shell etc.About 5.6 hundred million tons of the output of the annual forestry waste of China mainly comprises fruit tree branch, leaf, culled wood and wood chip etc.For a long time, the utilization of agriculture and forestry organic waste material does not cause people's great attention, and wasting phenomenon is very serious, is mainly used in cooking, and part is used for feed and paper making raw material, and a part is used for also field of stack retting.The 2.2 hundred million tons of residue stalks of also having an appointment are not used appropriately, and wherein the overwhelming majority is caused a large amount of wastings of resources by peasant's on-site incineration.For many years, every summer harvest, autumn harvest season, the igniting of village village is smoldered everywhere, endangers safe traffic, and harm residents ' health, field crop straw burning have become society's one big public hazards.Therefore, it has been not only an environmental protection and comprehensive utilization of resources problem that agriculture and forestry organic waste material utilizes problem, and has been related to the people's the health and the security of the lives and property.
Summary of the invention
Technical problem: the technical problem to be solved in the present invention provides that a kind of cost is low, the efficiency of combustion that improves incinerator, solve pollution problem, recycling agriculture and forestry organic waste material that mud causes, reduce pollutant especially heavy metal Ji the discharging of bioxin and reduce the consumption of fossil energy utilizes the grate furnace mixed burning to handle the method for agriculture and forestry organic waste material, mud and city's house refuse.
Technical scheme: for solving the problems of the technologies described above, technical scheme provided by the invention is:
A kind of method of utilizing grate furnace performing mixed incineration on agricultural and forestal wastes, mud and house refuse, fire grate garbage incinerator is provided, with the mixed combustion in fire grate garbage incinerator of agriculture and forestry organic waste material, mud and house refuse, the igniting of employing agriculture and forestry organic waste material, when treating that fire box temperature is increased to 850 ℃, add house refuse and mud realization multifuel combustion to burner hearth; Wherein mixing and burning the mass percent of agriculture and forestry organic waste material in fuel combination is in 40%, the mass percent of burning mixed mud in fuel combination is in 30%, grate incinerator internal combustion temperature is controlled at 850 ℃～1000 ℃, burns the flue gas that produces and is controlled at more than 2 seconds at residing time in furnace.
Preferably, described agriculture and forestry organic waste material is agricultural wastes and forestry waste such as fruit tree branch, leaf, culled wood, sugared slag or wood chip such as stalk, husk, chicken manure.
Preferably, described mud is municipal sludge or industrial sludge.
Preferably, mud do not need deep dehydration can with agriculture and forestry organic waste material and house refuse multifuel combustion.
Preferably, can use the house refuse and the mud of low heat value, high-moisture, and guarantee boiler realization normal combustion.
Preferably, agriculture and forestry organic waste material is gone into the stokehold, should be crushed to less than sending into emulsion zone by screw(-type) feeder behind the 500mm to burn.
Beneficial effect:
1, in fire grate garbage incinerator, realizes agriculture and forestry organic waste material, mud and the generating of domestic waste multifuel combustion, provide a kind of cleaning new energy utilize method in, comprehensive resource is handled domestic waste, mud and agriculture and forestry organic waste material, save valuable fossil energies such as coal, fuel oil, and the investment of saving newly-built mud and crop straw burning power plant, fast, strong operability of cycle.
2, in fire grate garbage incinerator, mix an amount of agriculture and forestry organic waste material of burning and mud, because the supportive of agriculture and forestry organic waste material is good, can improve the bulkiness and the gas permeability of whole mixed combustion thing, wind can waltz through fire grate and enter the burner hearth burning very much, and (particle diameter＜5mm) waits the air-vent of refuse obstruction fire grate to avoid graininess dregs in the domestic waste, plastics.
3, the grate furnace incineration technology is suitable for the higher rubbish of incinerating combustion value, and efficiency of combustion is lower, and steam production is low.Adopt agriculture and forestry organic waste material, mud and domestic waste multifuel combustion can use the rubbish of low heat value, high-moisture, and guarantee boiler realization normal combustion, reach the technological parameter of design.
4, mud do not need deep dehydration can with agriculture and forestry organic waste material and domestic waste multifuel combustion, saved the cost of sludge incineration generating greatly.
5, the burning of mixing of agriculture and forestry organic waste material and mud makes the ignition point of domestic waste reduce, and solves the combustion problem that the domestic waste moisture content is high and the composition instability is brought.Improve the incinerator fire box temperature, make combustion temperature in hearth, improve waste incineration operating mode stability at 850 ℃～1000 ℃ OK range.
6, the volatile content height of agriculture and forestry organic waste material, the low solid chlorine of himself, the solid sulphur property of reaching of sulphur and nitrogen content mixed the burning agriculture and forestry organic waste material and significantly reduced SO in the incineration flue gas
2, NOx, HCl, heavy metal be Ji the discharging of pollutants such as bioxin, coincide with the policy of China recycling economy.
7, solve the problem of environmental pollution that the agriculture and forestry organic waste material open incineration brings.
8, solve the problem of environmental pollution that mud brings.
Description of drawings
Fig. 1 mixes for fire grate garbage incinerator and burns agriculture and forestry organic waste material and sludge power generation system diagram.
The specific embodiment
The present invention will be further described below in conjunction with accompanying drawing.
A kind of system that utilizes the grate furnace mixed burning to handle agriculture and forestry organic waste material, mud and domestic waste generating of the present invention,
As shown in the figure, the mixed burning method provided by the invention system that is used to generate electricity mainly comprises:
Fuel handling system: main effect be with agriculture and forestry organic waste material, mud and domestic waste collect, accumulating is stand-by to burning electricity generation factory storage bin.
CIU: agriculture and forestry organic waste material, mud and domestic waste mixed material is by a certain percentage sent into incinerator, and the burning of the combustible component of material is converted into heat energy in incinerator, and not flammable component is converted into lime-ash discharging back and collects comprehensive utilization.
The energy conversion system, heat energy is converted into electric energy: the heat energy that the mixed material burning produces absorbs into high-quality steam by WATER AS FLOW MEDIUM, and the steam pushing turbine drives generator for electricity generation, realizes the conversion of heat energy to electric energy.
Smoke processing system: the flue gas that the mixed material burning is produced carries out purified treatment, qualified discharge.
Cinder resource treatment system: the lime-ash that the mixed material burning produces is collected, carried out recycling treatment, comprehensive utilization.
Main circulation technology flow process: agriculture and forestry organic waste material, mud and domestic waste → be collected into burning electricity generation factory → be discharged into storage bin → drop into incinerator → mixed material by proper ratio to produce heat energy → WATER AS FLOW MEDIUM in the incinerator internal combustion and absorb heat energy and become steam → steam and in superheating system, continues absorbing heat and improve the qualified steam of Steam-water Quality → quality and enter steam turbine pushing turbine acting → steam turbine by jet chimney and drive the generator generating and also finally be converted into electric energy → by transformer and conveying circuit and export and satisfy resident's productive life needs.
In garbage incinerating power plant, implement this invention, need not carry out the mixed combustion generating that large-scale technological improvement and equipment modification just can realize agriculture and forestry organic waste material, mud and domestic waste specially.The present invention finds agriculture and forestry organic waste material, mud and domestic waste mixed combustion through a large amount of experimental studies, and every service data and index all reach good effect.
The method of grate furnace performing mixed incineration on agricultural and forestal wastes, mud and house refuse of utilizing provided by the invention is: fire grate garbage incinerator is provided, with the mixed combustion in fire grate garbage incinerator of agriculture and forestry organic waste material, mud and house refuse, the igniting of employing agriculture and forestry organic waste material, when treating that fire box temperature is increased to 850 ℃, add house refuse and mud realization multifuel combustion to burner hearth; Wherein mixing and burning the mass percent of agriculture and forestry organic waste material in fuel combination is in 40%, the mass percent of burning mixed mud in fuel combination is in 30%, grate incinerator internal combustion temperature is controlled at 850 ℃～1000 ℃, burns the flue gas that produces and is controlled at more than 2 seconds at residing time in furnace.
In one embodiment, described agriculture and forestry organic waste material is agricultural wastes and forestry waste such as fruit tree branch, leaf, culled wood, sugared slag or wood chip such as stalk, husk, chicken manure.
In one embodiment, described mud is municipal sludge or industrial sludge.
In one embodiment, mud do not need deep dehydration can with agriculture and forestry organic waste material and house refuse multifuel combustion.
In one embodiment, can use the house refuse and the mud of low heat value, high-moisture, and guarantee boiler realization normal combustion.
In one embodiment, the rubbish pretreatment system need be set, only need large-sized building waste etc. sorted out and get final product.House refuse is burnt by the fire grate that feed hopper enters under being tilted to.
In one embodiment, agriculture and forestry organic waste material is gone into the stokehold, should be crushed to less than sending into emulsion zone by screw(-type) feeder behind the 500mm to burn.
Embodiment 1:
During boiler startup, stalk evenly is paved with on incineration furnace grate, and some grate material is generally selected the bulk cargo of length less than 100mm, requires some grate material 30～40cm thick, bulk cargo in the artificial smooth burner hearth is lighted the stalk on the fire grate with torch or other mode of igniting.Open one time wind, treat that fire box temperature is increased to 400 ℃, add agriculture and forestry organic waste material continuously to burner hearth, regulate first and second air quantity by screw(-type) feeder, when treating that fire box temperature is increased to 850 ℃, add domestic waste and mud realization multifuel combustion according to certain proportioning to burner hearth.Rationalization's air distribution is progressively adjusted to bed temperature 850 ℃～1000 ℃.
Embodiment 2:
Domestic waste moisture content height, calorific value are low.The moisture content of mud and composition complexity, it is bigger that calorific value differs, and in actual waste incineration running, the concrete mixed-fuel burning proportion of agriculture and forestry organic waste material should be according to the quality flexible modulation of rubbish and mud.Northern area rubbish in winter cinder of burned coal content height or southern area msw water content in rainy season height, combustible component are low, when refuse thermal value is low when reaching 700kcal/kg, the mixed-fuel burning proportion of agriculture and forestry organic waste materials such as straw, rice straw, cotton stalk, rice husk and fruit tree branch can reach 30%-40%, and the calorific value of fuel combination is brought up to more than the 1200kcal/kg; At rubbish, when sewage sludge quality is better, when calorific value was about 1000～1200kcal/kg, the mixed-fuel burning proportion of agriculture and forestry organic waste material was in 10%; 850 ℃～950 ℃ scopes of incinerator internal combustion temperature maintenance, the time of staying of flue gas in stove was greater than 2 seconds, thus raising rubbish burnout rate reduces pollutant emission, improves boiler combustion efficiency.
Claims (6)
1. method of utilizing fire grate garbage incinerator performing mixed incineration on agricultural and forestal wastes, mud and house refuse, it is characterized in that: fire grate garbage incinerator is provided, with the mixed combustion in fire grate garbage incinerator of agriculture and forestry organic waste material, mud and house refuse, the igniting of employing agriculture and forestry organic waste material, when treating that fire box temperature is increased to 850 ℃, add house refuse and mud realization multifuel combustion to burner hearth; Wherein mixing and burning the mass percent of agriculture and forestry organic waste material in fuel combination is in 40%, the mass percent of burning mixed mud in fuel combination is in 30%, fire grate garbage incinerator internal combustion temperature is controlled at 850 ℃～1000 ℃, burns the flue gas that produces and is controlled at more than 2 seconds at residing time in furnace.
2. the method for utilizing fire grate garbage incinerator performing mixed incineration on agricultural and forestal wastes, mud and house refuse according to claim 1, it is characterized in that: described agriculture and forestry organic waste material is agricultural wastes and forestry waste, wherein agricultural wastes are stalk, husk or chicken manure, and forestry waste is fruit tree branch, leaf, culled wood, sugared slag or wood chip.
3. the method for utilizing fire grate garbage incinerator performing mixed incineration on agricultural and forestal wastes, mud and house refuse according to claim 1 is characterized in that: described mud is municipal sludge or industrial sludge.
4. according to claim 1 or the 3 described methods of utilizing fire grate garbage incinerator performing mixed incineration on agricultural and forestal wastes, mud and house refuse, it is characterized in that: mud do not need deep dehydration can with agriculture and forestry organic waste material and house refuse multifuel combustion.
5. the method for utilizing fire grate garbage incinerator performing mixed incineration on agricultural and forestal wastes, mud and house refuse according to claim 1 is characterized in that: can use the house refuse and the mud of low heat value, high-moisture, and guarantee boiler realization normal combustion.
6. the method for utilizing fire grate garbage incinerator performing mixed incineration on agricultural and forestal wastes, mud and house refuse according to claim 1, it is characterized in that: agriculture and forestry organic waste material is gone into the stokehold, should be crushed to less than sending into emulsion zone by screw(-type) feeder behind the 500mm to burn.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010100171473A CN101737784B (en) | 2010-01-08 | 2010-01-08 | Method for mixed burning of agriculture and forestry waste, sludge and household garbage by using grate furnace |
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| CN2010100171473A CN101737784B (en) | 2010-01-08 | 2010-01-08 | Method for mixed burning of agriculture and forestry waste, sludge and household garbage by using grate furnace |
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| CN101737784B true CN101737784B (en) | 2011-06-29 |
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| CN104668270B (en) * | 2015-01-15 | 2018-07-13 | 首钢环境产业有限公司 | The method of cooperative disposal municipal solid wastes |
| CN107166396A (en) * | 2017-04-26 | 2017-09-15 | 成都中冶节能环保工程有限公司 | A kind of application method of garbage combustion device |
| CN107178783A (en) * | 2017-04-26 | 2017-09-19 | 成都中冶节能环保工程有限公司 | A kind of garbage incineration process for reducing dioxin |
| CN109282661B (en) * | 2018-09-04 | 2020-10-27 | 鞍钢股份有限公司 | Method for treating household garbage by hot blast furnace slag |
| CN113185166A (en) * | 2021-05-14 | 2021-07-30 | 中国电力工程顾问集团中南电力设计院有限公司 | System and method for jointly treating and utilizing various solid wastes |
| CN113522943B (en) * | 2021-09-16 | 2022-01-28 | 国能龙源环保有限公司 | Resourceful coupling treatment system for multiple types of organic solid wastes and use method thereof |
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| DE19839860A1 (en) * | 1998-09-02 | 2000-03-09 | Christian Eder | Process to render harbour sludge fit for disposal by de-watering, mixing with municipal waste and pellet incineration, reducing volume for final disposal |
| CN1896248A (en) * | 2006-06-19 | 2007-01-17 | 同济大学 | Production of hydrogen for combining mineralize refuse, swill waste and sludge |
| CN1958536A (en) * | 2006-11-20 | 2007-05-09 | 上海市园林科学研究所 | Method for preparing planting soil from sludge, tree branches, falling leaves, and mineralized garbage |
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