CN107143864A - A kind of technique of full combustion slime circulating fluidized bed boiler burning sludge - Google Patents
A kind of technique of full combustion slime circulating fluidized bed boiler burning sludge Download PDFInfo
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- CN107143864A CN107143864A CN201710487330.1A CN201710487330A CN107143864A CN 107143864 A CN107143864 A CN 107143864A CN 201710487330 A CN201710487330 A CN 201710487330A CN 107143864 A CN107143864 A CN 107143864A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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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
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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
- F23G5/30—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having a fluidised bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/70—Blending
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2203/00—Furnace arrangements
- F23G2203/50—Fluidised bed furnace
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Fluidized-Bed Combustion And Resonant Combustion (AREA)
Abstract
It is (4~99) by mass ratio the invention discloses a kind of technique of full combustion slime circulating fluidized bed boiler burning sludge:1 wet coal slime and sludge agitation mixing, then add water water content is made for 37~41% (quality) mixing slurries, material inlet at the top of boiler hearth of circulating fluidized bed is delivered to by the mixing slurry, and is fallen into burner hearth and burnt from material inlet；It is (12~18) by mass ratio:1 delivering dry coal slurry is mixed with mixed-powder with dolomite powder, and the mixed-powder is entered into stove chamber inner combustion through batcher；In combustion, ammoniacal liquor is sprayed into burner hearth.The technique can either utilize the energy in moisture and sludge in sludge, additionally it is possible to prevent sludge from producing dioxin in burning process, realize the innoxious of Treatment of Sludge, recycling, minimizing.
Description
Technical field
The present invention relates to a kind of technique of full combustion slime circulating fluidized bed boiler burning sludge.
Background technology
Sludge is the product after sewage disposal, is that one kind is made up of organic relic, microorganism, inorganic particle, colloid etc.
Extremely complex heterogeneous body.The key property of sludge is that moisture content is high, and content of organics is high, easily degenerates smelly, and
Particle is thinner, and proportion is smaller, jelly liquid.It is the concentrated thing between liquid and solid, can be transported with pump, but it
It is difficult to carry out separation of solid and liquid by settling.
At present, China's municipal sewage treatment industry development is rapid, but the supporting sludge comprehensive regulation is delayed.Municipal sewage treatment
Factory's purification sewage generation sludge water content is very big, and moisture is up to 70%~90%；Quantity is big, after ten thousand stere sewage disposal
Produce 5~10 tons of the sludge of water content 80%；And sludge is unstable, easy corruption, foul smelling；It must effectively handle, dispose.Fill out
It is the main disposal options of sludge to bury, and landfill requires that moisture percentage in sewage sludge is not more than 60%.The too high sludge of moisture content can not only increase
Plus amount of landfill, and collapse hidden danger with what mobility was unfavorable for that compaction in layers and may leaving fills out field.Carried out for reduction moisture
Sludge drying adds cost of disposal.Landfill will not only take substantial amounts of soil and spend substantial amounts of freight, and landfill
Environment around can also deteriorate, and be perplexed by Leachate site, foul smell.Burning is maximally effective Treatment of Sludge mode, but is existed
Problems with：First, auxiliary fuel must be added in burning process to consume the substantial amounts of energy, the cost and running cost of burning
It is very high.Asked second, there is smoke pollution, noise, vibrations, heat and radiation and produce the dioxin contamination as environment focus
Topic, tightened up requirement is proposed to burning facility and technique, result in investment and the further increase of operating cost.So,
Recycling is carried out to sludge relatively difficult.
The content of the invention
In order to solve the deficiencies in the prior art, burnt it is an object of the invention to provide a kind of full combustion slime circulating fluidized bed boiler
The technique of burning sludge, can either utilize the energy in the moisture and sludge in sludge, additionally it is possible to prevent sludge in burning process
Dioxin is produced, the innoxious of Treatment of Sludge, recycling, minimizing is realized.
To achieve these goals, the technical scheme is that：
A kind of technique of full combustion slime circulating fluidized bed boiler burning sludge, is (4~99) by mass ratio:1 wet coal slime
Mixed with sludge agitation, then add water and water content is made for 37~41% (quality) mixing slurries, the mixing slurry is delivered to and followed
Circulation fluidized bed boiler roof of the furnace material inlet, and fall into burner hearth and burnt from material inlet；It is (12~18) by mass ratio:1
Delivering dry coal slurry and dolomite powder be mixed with mixed-powder, the mixed-powder is entered into stove chamber inner combustion through batcher；
In combustion process, ammoniacal liquor is sprayed into burner hearth.
First, by wet coal slime and sludge agitation, add water and water content is made for 37~41% (quality) mixing slurries, make use of
Moisture in sludge, reduces the addition of water, and the water content of control mixing slurry can meet the flow device of fuel delivery means
It is required that, while combustion heat value of the sludge when moisture is 37~41% is 1200kCal/kg, sludge incineration can be made full use of to produce
Raw heat；Moisture is high, and evaporation time needed for coal slime sludge mixed slurry is longer, absorbs heat more；Catch fire more difficult, flying dust
Middle carbon residue content increase, so as to reduce the efficiency of combustion and stability of fluidized-bed combustion boiler；The low not only rheological behavior of moisture content is poor, coal slime
Sludge mixed slurry agglomerate is big, and slurry particle is thick, and bulky grain is separated to cyclone separator bottom before burning-out, induces slagging
Coking of material returner is caused, is forced blowing out when serious；By repetition test, mixing slurry keeps water content 37~41%, not only can be with
Ensure that sludge mixes burning amount, and boiler combustion is stable, and pollutant discharge amount hour is not exceeded；Fly ash combustible material 3% or so, boiler
High combustion efficiency, is 86~89%.Secondly, delivering dry coal slurry is mixed with dolomite powder, into stove fuel can be recovered
Grain screening composition, adjusts ciculation fluidized combustion system, changes fuel in stove chamber inner combustion atmosphere, keep the bed of material pressure difference of burning,
The burn-off rate of fuel is improved, so as to improve boiler efficiency, while desulfidation can also be played by adding dolomite, makes coal slime, sludge
In part sulphur, chlorine is fixed in lime-ash.3rd, by wet coal slime and the proportioning of sludge, delivering dry coal slurry and dolomite with when
Think to spray into ammoniacal liquor in burner hearth, the generation of the dioxin during sludge incineration can be prevented, so as to carry out innoxious, money to sludge
Source, minimizing processing.
Burning is divided into heating, moisture evaporation, Volatile and caught fire the stage.Mixing slurry group is fast big, and moisture content is high, calorific value
It is low, it is difficult to catch fire, moisture content is higher, required evaporation time is longer.Mixing slurry of the present invention enters from roof of the furnace, by self gravitation certainly
Hurtled down under above, the high-temperature flue gas run into from bottom to top washes away, and speed slightly slows down, and blanking is uniform；And 29.6 meters of burner hearth
Clear height, can provide sufficient combustion space.From the water-cooling wall for not only breaking up boiler elsewhere, potential safety hazard is caused, more
It is important that blanking is uneven, cause slagging failure.
The second object of the present invention is to provide a kind of application of above-mentioned technique in power supply or heat supply.
Beneficial effects of the present invention are：
1st, the present invention is reached the purpose of the cost-effective reduction wasting of resources, standard can be saved every year using the heat of sludge
2500 tons of coal.
2nd, the present invention directly utilizes sludge, reduces the intermediate link of sludge drying processing, annual to burn 1.83 ten thousand tons, can subtract
Few 1,830,000 yuan of Treatment of Sludge expense, while creating good social benefit.
3rd, the present invention takes full advantage of the heat of the high-temperature flue gas of burning sludge with circulating fluidized-bed boiler generation, oxygen-enriched to make dirt
Mud fully burns, and increases sludge burn-off rate, while the generation of bioxin can be prevented；Boiler efficiency is improved, pot is reduced
The operating cost of stove.
4th, the present invention can prevent harm of the destructor plant landfill sludge to social environment, make full use of comprehensive utilization electricity
Factory's waste treating device, reduces the consumption of power plant's industry water and the consumption of conventional fuel, reduces 1.7 ten thousand tons of industry water, reduce
Delivering dry coal slurry consumes 4100 tons, and saving water resource takes, costly about 1,300,000 yuan of fuel.
Embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Heretofore described wet coal slime is the coal slime that moisture is more than or equal to 20% (quality).
Heretofore described bar coal slime is the coal slime that moisture is less than 20% (quality).
Moisture in heretofore described sludge is 70~90% (quality).
The chemical composition of heretofore described dolomite is CaMg (CO3)2, wherein, the content of calcium oxide is 20~45%
(quality), content of magnesia 5~25% (quality).
As background technology is introduced, there is recycling sludge in the prior art and handle relatively difficult deficiency, in order to
Technical problem as above is solved, present applicant proposes a kind of technique of full combustion slime circulating fluidized bed boiler burning sludge.
There is provided a kind of full combustion slime circulating fluidized bed boiler burning sludge in a kind of exemplary embodiment of the application
Technique, is (4~99) by mass ratio:1 wet coal slime and sludge agitation mixing, then it is 37~41% to add water water content is made
(quality) mixing slurry, is delivered to material inlet at the top of boiler hearth of circulating fluidized bed, and fall into stove from material inlet by the mixing slurry
Burnt in thorax；It is (12~18) by mass ratio:1 delivering dry coal slurry is mixed with mixed-powder with dolomite powder, will be described
Mixed-powder enters stove chamber inner combustion through batcher；In combustion, ammoniacal liquor is sprayed into burner hearth.
First, by wet coal slime and sludge agitation, add water and water content is made for 37~41% (quality) mixing slurries, make use of
Moisture in sludge, reduces the addition of water, and the water content of control mixing slurry can meet the flow device of fuel delivery means
It is required that, while combustion heat value of the sludge when moisture is 37~41% is 1200kCal/kg, sludge incineration can be made full use of to produce
Raw heat, moisture is too high, can reduce the combustion heat value of fuel, and moisture is too low, and mixing slurry can be caused can not to be delivered to burner hearth
It is interior.Secondly, delivering dry coal slurry is mixed with dolomite powder, the particle screening composition into stove fuel, regulation circulation can be recovered
Fluidized bed combustion mode, change fuel keep the bed of material pressure difference of burning in stove chamber inner combustion atmosphere, improve the burn-off rate of fuel, from
And boiler efficiency is improved, while desulfidation can also be played by adding dolomite, it is fixed on part sulphur, chlorine in coal slime, sludge
In lime-ash.3rd, by wet coal slime and the proportioning of sludge, delivering dry coal slurry and matching somebody with somebody for dolomite when thinking to spray into ammoniacal liquor, energy in burner hearth
The generation of the dioxin during sludge incineration is enough prevented, is handled so as to carry out innoxious, recycling, minimizing to sludge.
It is preferred that there is provided big blast cap, the big blast cap is arranged on the air inlet of burner hearth.For burner hearth emulsion zone temperature point
Cloth is irregular, employs big blast cap, expands wind distributing face product, while the uniformity of air distribution plate vulcanization is ensured, increases primary air flow,
Create emulsion zone Tomita oxygen atmosphere.Increase for dust viscosity, ash particle degree diminishes, and fouling of heating surface tends to be serious, adds sound
Ripple soot blower is a set of, cleans heating surface, it is ensured that Stream temperature degree and exhaust gas temperature are normal, and flue gas loss is reduced to greatest extent,
Improve boiler efficiency.
It is preferred that, the moisture of the wet coal slime is 20~30% (quality).
It is preferred that, the moisture of the delivering dry coal slurry is 11~18% (quality).
It is preferred that, the particle diameter of the dolomite powder is 5~8 millimeters.
It is preferred that, the bed temperature of CFBB is 870~930 DEG C.
It is preferred that, secondary air flow is 38000~100000 cubes ms/h.
It is preferred that, bed of material pressure difference is 8.0~9.0KPa in burner hearth.
It is preferred that, the oxygen content at furnace outlet is 6~21% (volumes).
It is preferred that, the penetrating speed of the ammoniacal liquor is 300~600L/h.
The invention provides a kind of application of above-mentioned technique in power supply or heat supply.
In order that the technical scheme of the application can clearly be understood by obtaining those skilled in the art, below with reference to tool
The embodiment of body describes the technical scheme of the application in detail with comparative example.
Embodiment 1
The sludge containing water quality 70~90% that sewage treatment plant's purification sewage is produced, without drying and other treatment directly by sealed vehicle
Transport to wet coal slime area to be added, be evenly arranged in when unloading by wet coal slime heap.Then it is 40 according to mass ratio by forklift:1
Wet coal slime and the ratio of sludge wet coal slime and sludge are added to strong stirring storehouse, wet coal slime absorption is dirty in strong stirring storehouse
The moisture of mud, adds water, is prepared into the mixing slurry containing water quality 37%, is delivered to by scrapper conveyor in surge bunker, surge bunker
Mixing slurry is pumped into pressure piping by conveying, and the coal slirne interfacing conveyor on circulating fluid bed boiler top is delivered to by pressure piping
Device, hence into boiler hearth of circulating fluidized bed.
It is 15 by mass ratio:1 delivering dry coal slurry is mixed with mixed-powder with dolomite powder, and mixed-powder is defeated by belt
Deliver in feed bin, enter through front-furnace feeding machine in burner hearth.
Ammoniacal liquor is sprayed into 350L/h flow velocity into burner hearth.
The air inlet of burner hearth is provided with big blast cap, burner hearth, and mixing slurry, mixed-powder and ammoniacal liquor high-temp combustion occur anti-
Should, release boiler of feeding after heat and produce superheated steam generation heat supply, (temperature is 900 DEG C to high-temp combustion, and secondary air flow 40000 is stood
Square m/h, the bed of material differential pressure of burner hearth is maintained between 8.0~9.0KPa, oxygen at furnace exit 10% (volume)) react
The waste gas produced afterwards is by being discharged into air, solid waste feeding high-strength composite ash after electric-bag complex dust collector, desulfurizing tower purification
Processing line production building materials are comprehensively utilized.
It is as shown in table 1 using the composition of each material,
Table 1
From table 1 it follows that the sludge coal slirne (above-mentioned mixing slurry) used in embodiment and the coal slirne ratio that adds water
Compared with：Moisture reduces 1%, and ash increases by 3%, and volatile matter increases by 1%, and calorific value is close.
Pass through the present embodiment, the discharge capacity 55mg/Nm of sulfur dioxide3, nitrogen oxides 62mg/Nm3Meet emission request, and
Produced without dioxin.
Embodiment 2
The present embodiment is same as Example 1, and difference is, the mass ratio of wet coal slime and sludge is 4:1, what is be made is mixed
Close slurry is 41% containing water quality, and the mass ratio of delivering dry coal slurry and dolomite powder is 18:1.
By the present embodiment, the discharge capacity of sulfur dioxide meets emission request, and is produced without dioxin.
Embodiment 3
The present embodiment is same as Example 1, and difference is, the mass ratio of wet coal slime and sludge is 99:1, it is made
Mixing slurry is 39% containing water quality, and the mass ratio of delivering dry coal slurry and dolomite powder is 12:1.
By the present embodiment, the discharge capacity of sulfur dioxide meets emission request, and is produced without dioxin.
Comparative example 1
It is 3 by mass ratio:1 wet coal slime and sludge agitation mixing, the mixing slurry of the acquisition that do not add water is containing water quality
43.5%, water content is higher, though meet the flow device requirement of fuel delivery means, and the calorific value of the mixing slurry is relatively low, it is uncomfortable
In the fuel as CFBB.
Comparative example 2
It is 7 by mass ratio:1 wet coal slime and sludge agitation mixing, the mixing slurry of the acquisition that do not add water is containing water quality
35.7%, it is impossible to conveyed using fuel delivery means, be not suitable as the fuel of CFBB.
Comparative example 3
This comparative example is same as Example 1, and difference is, dolomite is replaced using lime stone.
By the present embodiment, the discharge capacity of sulfur dioxide does not meet emission request, and has a small amount of dioxin to produce.
Comparative example 4
This comparative example is same as Example 1, and difference is, delivering dry coal slurry is 20 with dolomite powder mass ratio:1.
By the present embodiment, the discharge capacity of sulfur dioxide meets emission request, but has a small amount of dioxin to produce.
Comparative example 5
This comparative example is same as Example 1, and difference is, ammoniacal liquor is not sprayed into burner hearth.
By the present embodiment, the discharge capacity of sulfur dioxide meets emission request, but has a large amount of dioxin to produce.
The preferred embodiment of the application is the foregoing is only, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of technique of full combustion slime circulating fluidized bed boiler burning sludge, it is characterized in that, it is (4~99) by mass ratio:1
Wet coal slime and sludge agitation mixing, then it is 37~41% (quality) mixing slurries to add water water content is made, the mixing slurry is defeated
Material inlet at the top of boiler hearth of circulating fluidized bed is delivered to, and falls into burner hearth and is burnt from material inlet；By mass ratio for (12~
18):1 delivering dry coal slurry is mixed with mixed-powder with dolomite powder, and the mixed-powder is entered into burner hearth internal combustion through batcher
Burn；In combustion, ammoniacal liquor is sprayed into burner hearth.
2. technique as claimed in claim 1, it is characterized in that there is provided big blast cap, the big blast cap is arranged on the air inlet of burner hearth
Place.
3. technique as claimed in claim 1, it is characterized in that, the moisture of the wet coal slime is 20~30% (quality)；Institute
The moisture for stating delivering dry coal slurry is 11~18% (quality).
4. technique as claimed in claim 1, it is characterized in that, the particle diameter of the dolomite powder is 5~8 millimeters.
5. technique as claimed in claim 1, it is characterized in that, the bed temperature of CFBB is 870~930 DEG C.
6. technique as claimed in claim 1, it is characterized in that, secondary air flow is 38000~100000 cubes ms/h.
7. technique as claimed in claim 1, it is characterized in that, bed of material pressure difference is 8.0~9.0KPa in burner hearth.
8. technique as claimed in claim 1, it is characterized in that, the oxygen content at furnace outlet is 6~21% (volumes).
9. technique as claimed in claim 1, it is characterized in that, the penetrating speed of the ammoniacal liquor is 300~600L/h.
10. a kind of application of any described technique of claim 1~9 in power supply or heat supply.
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| CN201710487330.1A CN107143864A (en) | 2017-06-23 | 2017-06-23 | A kind of technique of full combustion slime circulating fluidized bed boiler burning sludge |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109028050A (en) * | 2018-07-04 | 2018-12-18 | 济南市琦泉热电有限责任公司 | The method of adjustment of fluidized-bed combustion boiler burning burning of mixing coal slime mixed with dolomite |
| CN111102564A (en) * | 2019-12-16 | 2020-05-05 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Clean power generation method for mixed-burning coal slime based on bed temperature and bed pressure control |
| CN111238063A (en) * | 2020-03-17 | 2020-06-05 | 中国华能集团清洁能源技术研究院有限公司 | Sludge and slime drying device with energy stored by solar molten salt and operation method |
| CN114719251A (en) * | 2022-04-07 | 2022-07-08 | 华北电力大学 | Primary and secondary air quantity control method for circulating fluidized bed boiler directly doped with wet sludge |
| CN115218200A (en) * | 2022-05-18 | 2022-10-21 | 山西大学 | Coal slime and sludge flexible pumping process system coupled with coal-fired power plant |
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| CN101664632A (en) * | 2009-09-27 | 2010-03-10 | 济南市琦泉热电有限责任公司 | Desulfurization process for burning of mixing coal slime mixed with dolomite |
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| CN109028050A (en) * | 2018-07-04 | 2018-12-18 | 济南市琦泉热电有限责任公司 | The method of adjustment of fluidized-bed combustion boiler burning burning of mixing coal slime mixed with dolomite |
| CN111102564A (en) * | 2019-12-16 | 2020-05-05 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Clean power generation method for mixed-burning coal slime based on bed temperature and bed pressure control |
| CN111238063A (en) * | 2020-03-17 | 2020-06-05 | 中国华能集团清洁能源技术研究院有限公司 | Sludge and slime drying device with energy stored by solar molten salt and operation method |
| CN114719251A (en) * | 2022-04-07 | 2022-07-08 | 华北电力大学 | Primary and secondary air quantity control method for circulating fluidized bed boiler directly doped with wet sludge |
| CN115218200A (en) * | 2022-05-18 | 2022-10-21 | 山西大学 | Coal slime and sludge flexible pumping process system coupled with coal-fired power plant |
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