CN1288385C - Medical refuse burning system combining rotary furnace with circulating fluidized bed - Google Patents
Medical refuse burning system combining rotary furnace with circulating fluidized bed Download PDFInfo
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- CN1288385C CN1288385C CN 200410073588 CN200410073588A CN1288385C CN 1288385 C CN1288385 C CN 1288385C CN 200410073588 CN200410073588 CN 200410073588 CN 200410073588 A CN200410073588 A CN 200410073588A CN 1288385 C CN1288385 C CN 1288385C
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- 239000003546 flue gas Substances 0.000 claims abstract description 29
- 239000007789 gas Substances 0.000 claims abstract description 15
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Abstract
The present invention discloses a medical waste burning system combining a rotary furnace with a circulating fluidized bed. A burning chamber is composed of a rotary furnace performing the functions of pyrolysis and gasification and a circulating fluidized bed performing the function of burnout; in the circulating fluidized bed, the pyrolyzed flue gas of the rotary furnace stays for 3 to 4 seconds; solid combustible matters stay for 40 to 60 minutes, and thus, the present invention has high combustion efficiency which ensures the high-efficiency burnout of medical waste. Limestone is added in the circulating fluidized bed to keep acidic gas such as hydrogen chloride, etc. from being discharged and prevent the corrosion problems of a burning furnace and a tail flue, and thus, the burning system has long service life. Combustion-supporting air is heated to 500 DEG C above through a high-temperature air preheater; in normal operation, oil does not needed to be thrown to support combustion, and thus, operation cost is reduced; a rapid cooling device for flue gas lowers the temperature of the flue gas from 550 DEG C to 170 DEG C in 0.5 second under the condition that the rapid cooling device for flue gas doest not contact water, and thus, the present invention reduces the cryogenic recycling of dioxin and prevents secondary pollution.
Description
Technical field
The present invention relates to the medical refuse burning system of a kind of rotary kiln and recirculating fluidized bed coupling.
Background technology
Medical waste is meant the refuse with direct or indirect infection, toxicity and other harmfulness that medical and health organization produces in medical treatment, disease-prevention or healthcare and other correlated activations.The clinical waste contaminated environment, spreading disease, pose a health risk, endanger very greatly, is the primary refuse in " national hazardous waste register " 47 class hazardous wastes.The whole nation produced about 650,000 tons of clinical waste in 2002, and an average day generation is 1780 tons; Expect 2010, national clinical waste generation will reach more than 680,000 ton, and an average day generation reaches 1870 tons.For preventing that clinical waste from causing social danger, transmission; protection environment and guarantee health; the construction clinical waste centrally disposes engineering and carries out Whole Course Management; be safe storage and the disposal that realizes clinical waste; ensure the effective way of people ' s health and Environmental security; and in the construction that centrally disposes facility; the CIU of clean combustion, environment protection emission is particularly important, and exploitation efficiency of combustion height, pollutant can strictness reach " dangerous waste incineration pollution control criterion " (GB18484) CIU of emission request is extremely urgent.
Rotary kiln is present common a kind of medical refuse burning device, is derived from the rotary calciner of cement industry.Rotary kiln is a columniform cylindrical shell, inner lining refractory, slightly tilt to install, feed end is higher than discharging section, and motor drives cylindrical shell around the axle center unitary rotation by transmission mechanism, make medical waste mixing, pyrolytic gasification, catch fire, rubbish decomposes, is gasificated into fuel gas, therefore in slow rotation process, often as a combustion chamber of medical waste, a supporting dual firing chamber carries out after-flame simultaneously.But expose outlet end at present in the actual motion at rotary kiln, a large amount of using pyrolysis products are without burning discharge, and the effect of set traditional dual firing chamber all is used for the after-flame of gas, does not have further after-flame function for residual Jiao behind the rotary kiln pyrogenation or solid residue.Be difficult on the one hand to reach pyrolysis after heat burn decrement rate less than 5% target, cause secondary pollution on the other hand easily.
In addition, in the medical refuse burning system of rotary kiln and traditional dual firing chamber formation, because a large amount of chlorine-containing disinfectants and the plastic packaging bag that contain in the medical waste, make HCl content in the flue gas that medical refuse burning produces up to 1000ppm, caused the particularly etching problem of bootstrap system of back-end ductwork, under the serious situation, corrosion failure just appearred in back-end ductwork after two～three months, influenced the normal operation of system.
Recirculating fluidized bed is a kind of low pollution that is accepted with unanimity at electric power, environmental protection industry (epi) in recent years, efficient incineration technology, its ignition temperature is 850～950 ℃, the time of staying of solid particle in recirculating fluidized bed is long, efficiency of combustion is suitable for the high-efficient low polluting combustion of multiple different fuels such as coal, domestic waste, mud greater than 99%.Therefore, circulating fluidized bed technique is introduced medical refuse burning handle, the advantage of rotary kiln and recirculating fluidized bed is organically combined, form the medical waste treatment system that a kind of high-efficiency cleaning burns, have broad application prospects.
Summary of the invention
The object of the present invention is to provide the medical refuse burning system of a kind of rotary kiln and recirculating fluidized bed coupling.
Rotary kiln and recirculating fluidized bed are united the medical refuse burning system of formation, in CIU, elevating hopper is connected with batcher in turn, rotary kiln, rotary kiln and recirculating fluidized bed pyrolysis gas interface, the recirculating fluidized bed body, recirculating fluidized bed whirlwind separator, recirculating fluidized bed fluidized wind preheater, the flue gas quenching apparatus, semi-dry fume purifier, sack cleaner, air-introduced machine, chimney, the recirculating fluidized bed body is provided with the recirculating fluidized bed dilute-phase zone, the recirculating fluidized bed emulsion zone, slag-drip opening, pyrolysis wind and burnt wind air preheater and recirculating fluidized bed fluidized wind preheater also connect, the rotary kiln pyrogenation airduct of rotary kiln front end and pyrolysis wind and burnt wind air preheater upper end join, the rotary kiln rear end joins through rotary kiln and recirculating fluidized bed solid interface and recirculating fluidized bed body recirculating fluidized bed emulsion zone, recirculating fluidized bed whirlwind separator lower end is joined through recirculating fluidized bed loop back device and recirculating fluidized bed body recirculating fluidized bed emulsion zone, and recirculating fluidized bed body lower end joins through recirculating fluidized bed fluidisation airduct and recirculating fluidized bed fluidized wind preheater upper end.Recirculating fluidized bed fluidized wind preheater lower end and fluidisation blower fan join, and pyrolysis wind and burnt wind air preheater join with pyrolysis wind and burnt wind blower fan.
In service need not throw oil combustion-supporting normal in the present invention, reduces operating cost; Add the bed material of lime stone, can effectively suppress the discharging of the sour gas such as hydrogen chloride in the waste incineration, long service life as recirculating fluidized bed; The dual firing chamber that recirculating fluidized bed constitutes burns under 850～950 ℃ medium temperature condition, and the gentle time of staying of body heat hydrolysis products in recirculating fluidized bed of solid material is long, and the efficiency of combustion height has guaranteed the efficient after-flame of medical waste to prevent to cause secondary pollution.
Description of drawings
Accompanying drawing is the medical refuse burning system architecture schematic diagram of rotary kiln and recirculating fluidized bed coupling, among the figure: 1 elevating hopper, 2 batchers, 3 rotary kiln pyrogenation airducts, 4 rotary kilns, 5 rotary kilns and recirculating fluidized bed pyrolysis gas interface, 6 rotary kilns and recirculating fluidized bed solid interface, 7 recirculating fluidized beds burn airduct, 8 recirculating fluidized bed bodies, 9 recirculating fluidized bed whirlwind separators, 10 lime stones feed device, 11 recirculating fluidized bed fluidized wind preheaters, 12 recirculating fluidized bed fluidisation airducts, 13 pyrolysis wind and burnt wind air preheater, 14 recirculating fluidized bed loop back devices, 15 pyrolysis wind and burnt wind blower fan, 16 fluidized wind blower fans, 17 cooling water pumps, 18 flue gas quenching apparatus, 19 cooling towers, 20 semi-dry fume purifiers, 21 sack cleaners, 22 air-introduced machines, 23 chimneys, 24 recirculating fluidized bed dilute-phase zones, 25 recirculating fluidized bed emulsion zones, 26 slag-drip openings.
The specific embodiment
Rotary kiln of the present invention and recirculating fluidized bed are united the medical refuse burning chamber of formation, rotary kiln plays the refuse pyrolysis gasification, after rubbish feeds rotary kiln, in rotary kiln, rotatablely move slow forward, refuse pyrolysis under 500～600 ℃ hot blast effect, the combustible gas that produces after the pyrolysis is sent into the dilute-phase zone burning of recirculating fluidized bed top, and remaining solid matter is sent into the emulsion zone burning of recirculating fluidized bed bottom.Medical waste is tumbling motion in rotary kiln, material alternately is exposed in the hot flue gas, and the temperature of rotary kiln is relatively low, material is subjected to evenly heating slowly, moisture and volatile matter are separated out more even, have prevented the problem of combustible material detonations such as plastics when independent employing recirculating fluidized bed burns medical waste.
Recirculating fluidized bed plays the after-flame effect of gas phase and solid product after the pyrolysis in CIU, the bulk temperature of recirculating fluidized bed is between 850～1050 ℃, by classification air feed, oxygen-enriched combusting, strong reaction.After solid material enters recirculating fluidized bed, be the operation of fluidisation shape, its time of staying surpasses 40～60 minutes, has guaranteed burning of solid material, and the hot burn decrement rate of the lime-ash of discharge is less than 2%, far below the burning standard.
The fuel gas that rotary kiln pyrogenation comes out is after entering recirculating fluidized bed, gas contacts with 850～1050 ℃ of high concentration high temperature circulation solid particles of recirculating fluidized bed, the gas-solid two-phase is carried out strong heat exchange, the temperature of hot flue gas is elevated to rapidly more than 800 ℃, burning rapidly under the hyperoxia amount condition that the classification air feed feeds simultaneously, flue gas time of staying in recirculating fluidized bed surpasses 3～4 seconds, can make the abundant after-flame of fuel gas, effectively suppresses the generation of harmful substances such as dioxin.
Adding lime stone in recirculating fluidized bed expects as bed, the calcium oxide that lime stone pyrolysis under hot conditions produces can with the sour gas neutralization reactions such as hydrogen chloride that produce in the medical refuse burning, reduce the hydrogen chloride concentration of emission, avoided the etching problem of afterbody equipment.
The high-temperature flue gas that comes out from recirculating fluidized bed cools to 500 ℃ through air preheater earlier, and burning needed pyrolysis wind, fluidized wind and a burnt wind etc. are heated to more than 500 ℃, the high temperature combustion air has improved the ignition temperature level in the Burning Room, makes medical waste not need auxiliary fuel can keep burning.
The flue gas that comes out from the high temperature air preheater is cooled to 170 ℃ through the flue gas quenching apparatus, the flue gas chilling adopts the water pipe heat exchange type of cooling, flue gas flows outside pipe, water flows in pipe, not directly contact, avoided the generation and the after-treatment problem of sewage, the time of staying of flue gas in quenching apparatus reduced the low-temp recovery of dioxin in the flue gas less than 0.5 second.
As shown in drawings, rotary kiln and recirculating fluidized bed are united the Burning Room of formation, elevating hopper 1 is connected with batcher 2 in turn, rotary kiln 4, rotary kiln and recirculating fluidized bed pyrolysis gas interface 5, recirculating fluidized bed body 8, recirculating fluidized bed whirlwind separator 9, recirculating fluidized bed fluidized wind preheater 11, flue gas quenching apparatus 18, semi-dry fume purifier 20, sack cleaner 21, air-introduced machine 22, chimney 23, recirculating fluidized bed body 8 is provided with recirculating fluidized bed dilute-phase zone 24, recirculating fluidized bed emulsion zone 25, slag-drip opening 26, pyrolysis wind and burnt wind air preheater 13 and recirculating fluidized bed fluidized wind preheater 11 also connect, rotary kiln pyrogenation airduct 3 and the pyrolysis wind and burnt wind air preheater 13 upper ends of rotary kiln front end join, the rotary kiln rear end joins with recirculating fluidized bed body 8 recirculating fluidized bed emulsion zones through rotary kiln and recirculating fluidized bed solid interface 6, recirculating fluidized bed whirlwind separator 9 lower ends join through recirculating fluidized bed loop back device 14 and recirculating fluidized bed body 8 recirculating fluidized bed emulsion zones, and recirculating fluidized bed body 8 lower ends join through recirculating fluidized bed fluidisation airduct 12 and recirculating fluidized bed fluidized wind preheater 11 upper ends.Recirculating fluidized bed fluidized wind preheater 11 lower ends and fluidisation blower fan 16 join, and pyrolysis wind and burnt wind air preheater 13 join with pyrolysis wind and burnt wind blower fan 15.
Described rotary kiln and recirculating fluidized bed are united in the Burning Room of formation, rotary kiln plays the refuse pyrolysis gasification, recirculating fluidized bed works the effect of burning, the temperature of rotary kiln is 400～600 ℃, and the temperature of recirculating fluidized bed is 850～1050 ℃, the time of staying of flue gas behind the rotary kiln pyrogenation in recirculating fluidized bed is 3-4 second, and the time of staying of solid combustible is 40～60 minutes.In the flue gas quenching apparatus 18, flue gas is outside pipe, and cooling water flows in pipe.
Rubbish is connected to rotary kiln 4 by garbage feeding machine 2, pyrolysis under the hot blast effect of pyrolysis airduct 3, burning above 500 ℃, the combustible gas that burning discharges is sent into recirculating fluidized bed 8 bodies by rotary kiln and recirculating fluidized bed pyrolysis gas interface 5, recirculating fluidized bed dilute-phase zone 24 and cyclone separator 9 have constituted the dual firing chamber or the burning chamber of pyrolysis gas, add the hot blast of after-flame airduct 7 to guarantee sufficient oxygen supply in dilute-phase zone 24; The remaining solid matter of rotary kiln 4 pyrolysis is sent into recirculating fluidized bed 8 bodies by rotary kiln and recirculating fluidized bed solid interface 6, these solid matters are under the fluidization of recirculating fluidized bed fluidized wind 12, recirculating fluidized bed emulsion zone 25, dilute-phase zone 24, the burning space circulating combustion that cyclone separator 9 and loop back device 14 constitute, solid material following time of staying of hot environment of 850～950 ℃ above 30 minutes, guaranteed the abundant after-flame of solid material, the hot burn decrement rate of lime-ash of discharging burner hearths by big cinder notch 26 is less than 2%, and the lime-ash of discharge can directly use as building materials after removing metal.
The temperature range of recirculating fluidized bed dilute-phase zone 24 maintains 850～1050 ℃, the pyrolysis gas that rotary kiln 4 comes out time of staying of dilute-phase zone 24 above 2 seconds, time of staying of cyclone separator 9 above 3 seconds, the burning that has guaranteed gaseous products is complete, the discharging of organic pollutions such as dioxin is well below environmental protection standard, and 850～1050 ℃ reaction condition makes the discharging of NOx be lower than 50ppm.
Gas fume after burning is cooled to 550 ℃ through recirculating fluidized bed fluidized wind preheater 11 and pyrolysis wind and burnt wind air preheater 13, and combustion-supportingly be heated to 500 ℃ accordingly with pyrolysis wind and fluidized wind, both reduced flue-gas temperature, improved ignition temperature again, under normal operation, it is combustion-supporting not throw oil, has reduced operating cost.
Flue gas was reduced to 170 ℃ from 550 ℃ by quenching apparatus 18 in 0.5 second, prevent the low-temp recovery of dioxin.Discharging chimney 23 by semi-dry fume purifier 20, sack cleaner 21, air-introduced machine 22 then.
The CIU that adds dual firing chamber with general rotary kiln is different, and the present invention has provided the Burning Room structure of rotary kiln and recirculating fluidized bed coupling, makes solid material and the pyrolysis gas can completing combustion under 850～1050 ℃ temperature conditions.Recirculating fluidized bed adds lime stone (CaCO
3) as the bed material, under hot conditions, CaCO
3Resolve into CaO, carry out neutralization reaction with the hypochlorous acid of sterilization usefulness in the medical waste and the hydrogen chloride that the medical refuse burning process produces, both prevented the etching problem of equipment, prolong the life-span of equipment, reduced the hydrogen cloride concentration in the flue gas again, guaranteed the hydrogen chloride emission compliance, simultaneously, the source that has suppressed the chlorine of dioxin generation has reduced the concentration that dioxin discharges, and prevents that medical refuse burning from causing secondary pollution.
Claims (3)
1, the medical refuse burning system of a kind of rotary kiln and recirculating fluidized bed coupling, it is characterized in that, rotary kiln and recirculating fluidized bed are united the Burning Room of formation, elevating hopper (1) is connected with batcher (2) in turn, rotary kiln (4), rotary kiln and recirculating fluidized bed pyrolysis gas interface (5), recirculating fluidized bed body (8), recirculating fluidized bed whirlwind separator (9), recirculating fluidized bed fluidized wind preheater (11), flue gas quenching apparatus (18), semi-dry fume purifier (20), sack cleaner (21), air-introduced machine (22), chimney (23), recirculating fluidized bed body (8) is provided with recirculating fluidized bed dilute-phase zone (24), recirculating fluidized bed emulsion zone (25), slag-drip opening (26), pyrolysis wind and burnt wind air preheater (13) and recirculating fluidized bed fluidized wind preheater (11) also connect, the rotary kiln pyrogenation airduct (3) of rotary kiln front end joins with pyrolysis wind and burnt wind air preheater (13) upper end, the rotary kiln rear end joins through the recirculating fluidized bed emulsion zone (25) of rotary kiln and recirculating fluidized bed solid interface (6) and recirculating fluidized bed body (8), recirculating fluidized bed whirlwind separator (9) lower end joins through the recirculating fluidized bed emulsion zone of recirculating fluidized bed loop back device (14) with recirculating fluidized bed body (8), recirculating fluidized bed body (8) lower end joins through recirculating fluidized bed fluidisation airduct (12) and recirculating fluidized bed fluidized wind preheater (11) upper end, recirculating fluidized bed fluidized wind preheater (11) lower end and fluidisation blower fan (16) join, and pyrolysis wind and burnt wind air preheater (13) join with pyrolysis wind and burnt wind blower fan (15).
2, the medical refuse burning system of a kind of rotary kiln according to claim 1 and recirculating fluidized bed coupling, it is characterized in that described rotary kiln and recirculating fluidized bed unite in the Burning Room of formation, the temperature of rotary kiln is 400～600 ℃, the temperature of recirculating fluidized bed is 850～1050 ℃, the time of staying of flue gas behind the rotary kiln pyrogenation in recirculating fluidized bed is 3-4 second, and solid combustible is 40～60 minutes in the time of staying of recirculating fluidized bed.
3, the medical refuse burning system of a kind of rotary kiln according to claim 1 and recirculating fluidized bed coupling, it is characterized in that in the described flue gas quenching apparatus (18), flue gas is outside pipe, and cooling water is in pipe, and the time of staying of flue gas in quenching apparatus was less than 0.5 second.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410073588 CN1288385C (en) | 2004-12-27 | 2004-12-27 | Medical refuse burning system combining rotary furnace with circulating fluidized bed |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410073588 CN1288385C (en) | 2004-12-27 | 2004-12-27 | Medical refuse burning system combining rotary furnace with circulating fluidized bed |
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| CN1644988A CN1644988A (en) | 2005-07-27 |
| CN1288385C true CN1288385C (en) | 2006-12-06 |
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2004
- 2004-12-27 CN CN 200410073588 patent/CN1288385C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102829642A (en) * | 2012-09-24 | 2012-12-19 | 天津辰创环境工程科技有限责任公司 | Furnace dust incineration processing method of calcium carbid furnace |
| CN102829642B (en) * | 2012-09-24 | 2014-04-09 | 天津辰创环境工程科技有限责任公司 | Furnace dust incineration processing method of calcium carbid furnace |
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| Publication number | Publication date |
|---|---|
| CN1644988A (en) | 2005-07-27 |
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