CN101776271B - Fluidized bed incinerating device and process suitable for treatment of waste with low heating value - Google Patents

Fluidized bed incinerating device and process suitable for treatment of waste with low heating value Download PDF

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Publication number
CN101776271B
CN101776271B CN2010101229518A CN201010122951A CN101776271B CN 101776271 B CN101776271 B CN 101776271B CN 2010101229518 A CN2010101229518 A CN 2010101229518A CN 201010122951 A CN201010122951 A CN 201010122951A CN 101776271 B CN101776271 B CN 101776271B
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China
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burner hearth
fluid bed
air
wind
combustion
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CN2010101229518A
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Chinese (zh)
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CN101776271A (en
Inventor
金余其
池涌
严建华
李晓东
马增益
蒋旭光
杨家林
王飞
陆胜勇
黄群星
倪明江
岑可法
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浙江大学
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Abstract

The invention discloses a fluidized bed incinerating device and process suitable for treatment of solid waste with low heating value. In the process, a high-temperature air preheater is arranged to improve the primary air temperature, a heat-insulated furnace hearth is arranged to improve the combustion temperature of the furnace hearth, and a burn-out chamber is arranged to prolong the combustion time, so that the combustion temperature of a dilute-phase region in the furnace hearth is 900-1100 DEG C, and the flue gas dwell time is 4-5 seconds, thereby ensuring the high-temperature clean combustion of the waste with the low heating value. The combustion process is not only suitable for incinerating treatment of various sludge, household garbage and the like with high water content and low heating value, but also is suitable for treatment of some dangerous wastes difficult to combust. The process is suitable for solid wastes with net heating value of lower than 3500-6000kJ/kg. If the net heating value of the waste is lower than 3500kJ/kg, a small amount of auxiliary fuel coal can be added to enable the net heating value of the mixed fuel to be more than 3500kJ/kg. Meantime, the heat efficiency of the incinerating device can achieve 80-85%, and the flue gas emission can achieve the pollution control standard for hazardous waste incineration.

Description

A kind of fluidized bed combustion device and technology that is suitable for treatment of waste with low heating value

Technical field

The present invention relates to discarded object energy, application technology as the second resource field, relate in particular to a kind of fluidized bed combustion device and technology that is suitable for treatment of waste with low heating value.

Background technology

Along with the raising of expanding economy and people's environmental consciousness, a large amount of solid waste of China are needed harmlessness disposing badly, and burning method makes it become one of main method of offal treatment in the advantage that subtracts aspect appearance, decrement and the energy.But most solid waste are because combustible content is low, moisture is higher, and calorific value is lower, as the house refuse of municipal administration or industrial sludge, mixed collection etc.In order to guarantee the high temperature clean incineration of this type of discarded object, just may need to add auxiliary fuel.At this moment, how to avoid using or to reduce the auxiliary fuel use amount as far as possible most important for reducing the processing cost of burning.Solid waste incineration stove ubiquity processing cost height that domestic scale is less or incineration temperature deficiency, fume emission problem not up to standard.

Domestic patent (the CN2702185 mud burning treatment apparatus that also once proposed some mud, waste incineration disposal aspect, CN1669961 sludge incineration processing method and sludge incineration treatment system sludge incineration processing method and sludge incineration treatment system, the CN1584399 incinerator, the CN1580635 non-combustion-supporting garbage incinerator).The technology that patent CN2702185 adopts first mummification to burn again, investment operating cost is bigger; Patent CN1669961 then is a disposal options of utilizing existing ciculation fluidized coal-burning boiler, and existence is bigger to original boiler influence, and treating capacity is less; Patent CN1584399, CN1584399 then exist the waste incineration time of staying short, efficiency of combustion low and fume emission may be not up to standard etc. problem.

Summary of the invention

The objective of the invention is to overcome the deficiencies in the prior art, a kind of fluidized bed combustion device and technology that is suitable for treatment of waste with low heating value is provided.

The fluidized bed combustion device that is suitable for treatment of waste with low heating value comprises low heat value solid waste charging gear, assistant coal materials device, scum pipe, air compartment, air distribution plate, fluid bed burner hearth emulsion zone, secondary hot-air tuyere, fluid bed burner hearth dilute-phase zone, burning chamber, ash releasing tube, convection bank, wind high temperature air preheater, economizer, secondary wind air preheater; Fluid bed burner hearth emulsion zone and dilute-phase zone lateral wall are provided with low heat value solid waste charging gear, assistant coal materials device and secondary hot-air tuyere, fluid bed burner hearth emulsion zone bottom is provided with air distribution plate and air compartment successively, fluid bed burner hearth emulsion zone bottom is provided with scum pipe, and pass air distribution plate and air compartment, fluid bed burner hearth dilute-phase zone upper end links to each other with burning chamber, the burning chamber bottom links to each other with convection bank, burning chamber and convection bank bottom are respectively equipped with ash releasing tube, are provided with wind high temperature air preheater successively one time in the flue that the convection bank exhanst gas outlet connects, economizer and secondary wind air preheater.

The fluidized combustion technology that is suitable for the low heat value disposition of solid waste is: a wind is by a wind high temperature air preheater heating, temperature rises to 450~500 ℃, through air compartment, air distribution plate is in fluid bed burner hearth emulsion zone and solid waste, the abundant mixed combustion of assistant coal, secondary wind is by the heating of secondary wind air preheater, temperature rises to 150~200 ℃, enter fluid bed burner hearth aftercombustion air from fluid bed burner hearth dilute-phase zone bottom, the ratio of primary air flow and secondary air flow is 0.8~1.2: 1, burning chamber is arranged in the outlet of fluid bed burner hearth dilute-phase zone top, combustion product gases is at the time of staying of fluid bed burner hearth dilute-phase zone and burning chamber 4~5s, ignition temperature remains on 900~1100 ℃, fluid bed burner hearth emulsion zone, fluid bed burner hearth dilute-phase zone and burning chamber are adiabatic the layout, flue gas is by convection bank, a wind high temperature air preheater, economizer, behind the secondary wind air preheater heating surface, exhaust gas temperature drops to 140~160 ℃, the combustion product gases waste heat is fully used, the phosphorus content mass percent of slag is 0.5~1% at the bottom of the burner hearth, and the phosphorus content mass percent of flying dust is 3~5%, and convection bank port of export flue-gas temperature is 600~700 ℃.

The present invention compares with background technology, the useful effect that has is: the incinerator by this technological design need not add auxiliary fuel for the solid waste of net heating value 3500~6000kj/kg, the burner hearth incineration temperature maintains 900~1100 ℃, the smoke combustion time of staying 4~5s, thereby guarantee the clean incineration of low heat value solid waste, make the thermal efficiency of low heat value solid trash burner can reach 80~85% simultaneously, the phosphorus content mass percent 0.5~1% of slag at the bottom of the burner hearth, the phosphorus content mass percent 3~5% of flying dust.

Description of drawings

Accompanying drawing is a low heat value solid waste fluidized bed combustion device structural representation; Among the figure, low heat value solid waste charging gear 1, assistant coal materials device 2, scum pipe 3, air compartment 4, air distribution plate 5, fluid bed emulsion zone 6, secondary hot-air tuyere 7, fluid bed dilute-phase zone 8, burning chamber 9, ash releasing tube 10, convection bank 11, wind high temperature air preheater 12, economizer 13, secondary wind air preheater 14.

The specific embodiment

As shown in drawings, the fluidized bed combustion device that is suitable for treatment of waste with low heating value comprises low heat value solid waste charging gear 1, assistant coal materials device 2, scum pipe 3, air compartment 4, air distribution plate 5, fluid bed burner hearth emulsion zone 6, secondary hot-air tuyere 7, fluid bed burner hearth dilute-phase zone 8, burning chamber 9, ash releasing tube 10, convection bank 11, wind high temperature air preheater 12, economizer 13, secondary wind air preheater 14; Fluid bed burner hearth emulsion zone 6 and dilute-phase zone 8 lateral walls are provided with low heat value solid waste charging gear 1, assistant coal materials device 2 and secondary hot-air tuyere 7, fluid bed burner hearth emulsion zone 6 bottoms are provided with air distribution plate 5 and air compartment 4 successively, fluid bed burner hearth emulsion zone 6 bottoms are provided with scum pipe 3, and pass air distribution plate 5 and air compartment 4, fluid bed burner hearth dilute-phase zone 8 upper ends link to each other with burning chamber 9, burning chamber 9 bottoms link to each other with convection bank 11, burning chamber 9 and convection bank 11 bottoms are respectively equipped with ash releasing tube 10, are provided with wind high temperature air preheater 12 successively one time in the flue that convection bank 11 exhanst gas outlets connect, economizer 13 and secondary wind air preheater 14.

The fluidized combustion technology that is suitable for the low heat value disposition of solid waste is: a wind is by wind high temperature air preheater 12 heating, temperature rises to 450~500 ℃, through air compartment 4, air distribution plate 5 is in fluid bed burner hearth emulsion zone 6 and solid waste, the abundant mixed combustion of assistant coal, secondary wind is by 14 heating of secondary wind air preheater, temperature rises to 150~200 ℃, enter fluid bed burner hearth aftercombustion air from fluid bed burner hearth dilute-phase zone 8 bottoms, the ratio of primary air flow and secondary air flow is 0.8~1.2: 1, burning chamber 9 is arranged in the outlet of fluid bed burner hearth dilute-phase zone 8 tops, combustion product gases is at the time of staying 4~5s of fluid bed burner hearth dilute-phase zone 8 and burning chamber 9, ignition temperature remains on 900~1100 ℃, fluid bed burner hearth emulsion zone 6, fluid bed burner hearth dilute-phase zone 8 and burning chamber 9 are adiabatic the layout, flue gas is by convection bank 11, a wind high temperature air preheater 12, economizer 13, behind secondary wind air preheater 14 heating surfaces, exhaust gas temperature drops to 140~160 ℃, the combustion product gases waste heat is fully used, the phosphorus content mass percent of slag is 0.5~1% at the bottom of the burner hearth, and the phosphorus content mass percent of flying dust is 3~5%, and convection bank 11 port of export flue-gas temperatures are 600~700 ℃.

Embodiment: 2 incinerators of Foochow oil plant (spring port) waste incineration plant adopt this technology burning disposal POX waste residue, waste residue contains moisture mass percent 80%, the low level net heating value is 2500~3200kJ/kg, mix the bituminous coal of the 21000kJ/kg that burns mass percent 10% in the burning process, every incinerator is per hour handled waste residue 5t; The slag phosphorus content is a mass percent 0.8% at the bottom of the incinerator burner hearth, and unburned carbon in flue dust is a mass percent 4.2%, and the burning boiler thermal efficiency reaches 82.5%.

Claims (1)

1. fluidized combustion technology that is suitable for the low heat value disposition of solid waste, it is characterized in that: a wind high temperature air preheater (12) heating of wind fluidized bed combustion device by being suitable for treatment of waste with low heating value, temperature rises to 450~500 ℃, through air compartment (4), air distribution plate (5) is in fluid bed burner hearth emulsion zone (6) and solid waste, the abundant mixed combustion of assistant coal, secondary wind is by secondary wind air preheater (14) heating, temperature rises to 150~200 ℃, enter fluid bed burner hearth aftercombustion air from fluid bed burner hearth dilute-phase zone (8) bottom, the ratio of primary air flow and secondary air flow is 0.8~1.2: 1, burning chamber (9) is arranged in the outlet of fluid bed burner hearth dilute-phase zone (8) top, combustion product gases is at the time of staying 4~5s of fluid bed burner hearth dilute-phase zone (8) and burning chamber (9), ignition temperature remains on 900~1100 ℃, fluid bed burner hearth emulsion zone (6), fluid bed burner hearth dilute-phase zone (8) and burning chamber (9) are adiabatic the layout, flue gas is by convection bank (11), a wind high temperature air preheater (12), economizer (13), behind secondary wind air preheater (14) heating surface, exhaust gas temperature drops to 140~160 ℃, the combustion product gases waste heat is fully used, the phosphorus content mass percent of slag is 0.5~1% at the bottom of the burner hearth, and the phosphorus content mass percent of flying dust is 3~5%, convection bank (11) port of export flue-gas temperature is 600~700 ℃, and the described fluidized bed combustion device that is suitable for treatment of waste with low heating value comprises low heat value solid waste charging gear (1), assistant coal materials device (2), scum pipe (3), air compartment (4), air distribution plate (5), fluid bed burner hearth emulsion zone (6), secondary hot-air tuyere (7), fluid bed burner hearth dilute-phase zone (8), burning chamber (9), ash releasing tube (10), convection bank (11), a wind high temperature air preheater (12), economizer (13), secondary wind air preheater (14); Fluid bed burner hearth emulsion zone (6) and dilute-phase zone (8) lateral wall are provided with low heat value solid waste charging gear (1), assistant coal materials device (2) and secondary hot-air tuyere (7), fluid bed burner hearth emulsion zone (6) bottom is provided with air distribution plate (5) and air compartment (4) successively, fluid bed burner hearth emulsion zone (6) bottom is provided with scum pipe (3), and pass air distribution plate (5) and air compartment (4), fluid bed burner hearth dilute-phase zone (8) upper end links to each other with burning chamber (9), burning chamber (9) bottom links to each other with convection bank (11), burning chamber (9) and convection bank (11) bottom are respectively equipped with ash releasing tube (10), are provided with a wind high temperature air preheater (12) successively in the flue that convection bank (11) exhanst gas outlet connects, economizer (13) and secondary wind air preheater (14).
CN2010101229518A 2010-03-12 2010-03-12 Fluidized bed incinerating device and process suitable for treatment of waste with low heating value CN101776271B (en)

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Publication number Priority date Publication date Assignee Title
CN102200276A (en) * 2011-04-26 2011-09-28 清华大学 Furnace-boiler separation system for combusting low-calorific-value solid fuel
CN102878569B (en) * 2012-09-19 2015-01-21 浙江大学 High-temperature air combustion intensifying device and method applicable to low heating value mixed garbage
CN103486605A (en) * 2013-08-22 2014-01-01 太仓新瑞节能设备有限公司 High-efficiency micro-emission energy-saving boiler capable of recycling remaining energy
CN104251496B (en) * 2013-12-25 2018-08-21 山东尧舜热能科技有限公司 A kind of coal slime incinerator
CN105782989B (en) * 2016-05-07 2017-12-12 宁波众茂姚北热电有限公司 The air inlet method and its garbage burning boiler equipment of garbage burning boiler burner hearth
CN110631020A (en) * 2019-08-15 2019-12-31 杭州国泰环保科技股份有限公司 Dry sludge dewatering incinerator system and dry sludge dewatering incineration method thereof

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DE4007635C1 (en) * 1990-03-10 1991-09-19 Vereinigte Kesselwerke Ag, 4000 Duesseldorf, De
CN1321851A (en) * 2000-04-29 2001-11-14 浙江大学 City house refuse internal circulating different weight fluidized-bed incineration boiler
CN201437986U (en) * 2009-06-12 2010-04-14 浙江大学 Special waste fluidized bed incinerator

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