CN1270988C - Sludge burning treatment method and system - Google Patents
Sludge burning treatment method and system Download PDFInfo
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- CN1270988C CN1270988C CNB2005100384163A CN200510038416A CN1270988C CN 1270988 C CN1270988 C CN 1270988C CN B2005100384163 A CNB2005100384163 A CN B2005100384163A CN 200510038416 A CN200510038416 A CN 200510038416A CN 1270988 C CN1270988 C CN 1270988C
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Abstract
The present invention relates to a sludge incineration treating method and a sludge incineration treating system. The method comprises the steps that dewatered sludge with the water content of 75% to 85% is conveyed to a combustion chamber of a circulating fluidized bed; pollution gas generated in the storing process of the dewatered sludge is loaded into the combustion chamber of the circulating fluidized bed, and the dewatered sludge, the pollution gas and coal are incinerated together; tail gas generated by incineration is treated and discharged. The system is provided with a circulating fluidized bed boiler, a dust remover and a sludge storing chamber. The dewatered sludge passes through a sludge conveying pipe and a sludge spraying head and then is sprayed through a screw pump into the combustion chamber of the circulating fluidized bed for incineration, and the pollution gas generated by the sludge is conveyed to the combustion chamber through a blower for incineration. The system can also be provided with a steam blowing device and a high pressure water cleaning device; consequently, the screw pump, the sludge conveying pipe and the sludge spraying head are cleaned at uncertain time so as to prevent the screw pump, the sludge conveying pipe and the sludge spraying head from being blocked by the dewatered sludge. The present invention has the advantages of low cost and preferable treatment effect.
Description
Technical field
The present invention relates to a kind of sludge incineration processing method and sludge incineration treatment system, relate to a kind of method and system that utilizes circulating fluidized bed mud to be carried out burning disposal by it.
Background technology
Now, it is several that the municipal wastewater treatment plant treatment process of sewage being carried out the dewatered sludge that obtains after pollution treatment is handled mainly contains sanitary landfill, soil utilization, anhydration and incineration.
The sanitary landfill of mud starts from nineteen sixties; be that the angle from the protection environment grows up on the basis that tradition is buried; mainly be that landfill yard is carried out strict scientific analysis and necessary place protective treatment; up to the present; developed into the sludge treatment technology of a comparative maturity, its advantage is big, the instant effect of less investment, capacity.But, there are many problems in the sanitary landfill of municipal sludge: the various toxic substances in the landfill yard make the part pollution substance in the mud enter face of land deep layer and the polluted underground water environment through the erosion and the seepage effect of rainwater, so the method for sludge treatment of sanitary landfill is to being that the area of life water source is absolutely unsafe with underground water; In addition, the place of suitable landfill mud is also fewer and feweri because of a large amount of outputs of municipal sludge, and the various expenses in place are also more and more higher.According to the sanitary landfill condition survey report of portion about mud, by 2005, the mud sanitary landfill place of European Union member countries only can hold 17% of mud ultimate production.
The soil utilization of mud also has historical for many years, and this method mainly is that mud is carried out nontoxicization processing, promptly will carry out purifying treatment and mud is carried out During High-Temperature Composting various harmful elements in sewage treatment process; The place etc. that can be used to make agricultural fertilizer or be used for improveing discarded mining site through the mud of nontoxicization processing.The method of soil utilization has advantage such as nutrient in low, the recyclable mud of energy consumption, but owing to contain a large amount of pathogenic bacterias, parasite (ovum) in the mud, and heavy metal and venomous injurants such as polychlorobiphenyl, dioxin, radioelement such as copper, aluminium, zinc, chromium, mercury, even through nontoxicization processing, also be difficult to totally, so most of country is all to having made strict regulation through the performance that is used as the mud of soil utilization after the nontoxicization processing these hazardous and noxious substances removals.The purpose of these regulations is venomous injurant contaminated soil or the water bodys in the mud, but these regulations have also increased greatly mud is carried out the expense that the soil utilizes.
The anhydration and incineration of mud originates in the twentieth century middle period, because contain a large amount of organism and combustiblesubstances such as a certain amount of Mierocrystalline cellulose, xylogen in the mud of municipal wastewater treatment plant, mix after an amount of detonator, catalyzer, the raising agent etc., can be made into " synthol ", this synthol can be used as the auxiliary fuel of factory with boiler or domestic boiler.The advantage of dehydrated incineration method is that the residuum of burning generation is few, and the lime-ash free from extraneous odour after burning; But the investment of the treatment facility of anhydration and incineration is huge, running expense is high and produce large quantity of exhaust gas, so the anhydration and incineration of mud is mainly used in following situation: too poor or the too big or existing landfill lack of space of mud quantum of output of sludge nature.
Circular fluid bed is the boiler that adopts the circulating fluidized bed combustion mode, and parameter, quality are produced steam in accordance with regulations, are used for thermal power generation, heat supply or other purposes.Circulating fluidized bed combustion is the combustion technology of a kind of coal combustion, refuse and various biomass fuels.Its ultimate principle is that the bed material is burnt under fluidized state.General coarse particle is in the burning of bottom, combustion chamber, and fine particle burns on top, combustion chamber.The fine particle that is blown the combustion chamber is sent combustion chamber internal recycle burning back to after various separator separated and collected are got off.Circular fluid bed is owing to adopt the low temperature fractional combustion and add sweetening agent such as Wingdale etc. in burner hearth, so in combustion processes, can remove the sulfurous gas that sulfurous fuels produces easily, and suppress the NOx growing amount, make it have high-efficiency low-pollution, fuel adapts to outstanding features such as wide.
Circular fluid bed mainly comprises boiler body, tail vertical well gas flue, separator, material returning device, blower fan; Be provided with air distribution plate in the boiler body, the air distribution plate below is the igniting air compartment, and the air distribution plate top is the combustion chamber, establishes water wall in the combustion chamber; Heat-exchange equipments such as superheater, economizer, air preheater are set in the tail vertical well gas flue; Also have various utility appliance in addition, as feeder, drum, slag storehouse etc.The air that blower fan is sent into can the branch multichannel, the one tunnel through the air preheater preheating after the air distribution plate of bottom, combustion chamber enters the combustion chamber, make coal do the fluid boiling burning; One the tunnel enters material returning device after preheating makes returning charge wind; Can also dividing one the tunnel, to enter burner hearth middle part after preheating combustion-supporting; Outside water enters drum after the economizer preheating, carry out heat exchange and in drum, produce high-pressure saturated steam thereby the water in the drum enters water wall, this saturation steam is through the further heating of superheater and obtain superheated vapour, and superheated vapour can be used to generating or directly flows to the client as thermal source.
Summary of the invention
The purpose of this invention is to provide that a kind of cost is lower, treatment effect sludge incineration processing method and sludge incineration treatment system preferably.
A kind of sludge incineration processing method of realizing the object of the invention is: with water ratio is that 75%～85% dewatered sludge is delivered in the COMBUSTION IN CIRCULATION FLUIDIZED BED chamber, sent in the COMBUSTION IN CIRCULATION FLUIDIZED BED chamber by the dusty gas that dewatered sludge produces in storage, dewatered sludge, dusty gas burn with coal; Burning the tail gas that produces discharges after treatment.
The water ratio of above-mentioned mud is the weight percentage of moisture in mud.
In the aforesaid method dewatered sludge being delivered in the COMBUSTION IN CIRCULATION FLUIDIZED BED chamber is with spiral pump dewatered sludge to be injected into from sludge spray head in the COMBUSTION IN CIRCULATION FLUIDIZED BED chamber through sludge carrier pipe; The pressure that promptly utilizes spiral pump to produce makes dewatered sludge be injected in the combustion chamber by sludge spray head and burns, dewatered sludge is torn into small-particle from sludge spray head ejection back because of the influence that is subjected to surrounding gas friction resistance, thereby greatly increased the surface-area of dewatered sludge, can have been made the dewatered sludge detonation by instantaneous vaporization in the high temperature gas flow of the moisture in the dewatered sludge of fine granularity in the fluidized-bed combustion boiler combustion chamber.
In the above-mentioned process that dewatered sludge is injected into the COMBUSTION IN CIRCULATION FLUIDIZED BED chamber, need not timing clean sludge splash head, to prevent the dehydrated sludge blockage of sludge spray head.The method of not timing clean sludge splash head is being used to of being connected with sludge spray head to be set import the scavenging duct that has control valve of the highly compressed saturation steam of circular fluid bed generation, utilizes high-pressure saturated steam to purge to be bonded in the dewatered sludge in the sludge spray head.
In the above-mentioned process that dewatered sludge is injected into the COMBUSTION IN CIRCULATION FLUIDIZED BED chamber, need not timing clean sludge transfer lime and spiral pump, to prevent the dehydrated sludge blockage of sludge carrier pipe and spiral pump; The method of not timing clean sludge transfer lime and spiral pump is the wash tube that has control valve that is used to import high pressure water be connected with sludge carrier pipe is set, is provided for stoping high pressure water to pour the control valve of the combustion chamber of circular fluid bed on sludge carrier pipe, utilizes high pressure water to clean to be bonded in the dewatered sludge in sludge carrier pipe and the spiral pump.
Because the combustion reactions ability of coal cinder is relatively poor, generally it is broken into particle diameter and sends in the circular fluid bed again smaller or equal to the small-particle coal cinder of 10mm or after grinding into coal dust and burn.In coal, also can add sweetening agent, with desulfurization in the burning burning process; The weight ratio of the sweetening agent that wherein adds in circulating fluidized bed combustor, dewatered sludge, coal is 1.5～4: 20～30: 70～80.
The heat that the inventive method produces when deodorization by incineration sewage sludge, dusty gas and coal can be used for producing superheated vapour, and superheated vapour can be used to generating or directly flows to the client as thermal source.
Realize a kind of sludge incineration treatment system of the object of the invention, have circular fluid bed, fly-ash separator and mud storeroom; Circular fluid bed comprises boiler body, tail vertical well gas flue, separator, material returning device, primary air fan; Be provided with first air preheater in the tail vertical well gas flue; Be provided with air distribution plate in the described boiler body, the air distribution plate top is the combustion chamber, the respective combustion chamber bottom is provided with coal inlet and circulating ash ash inlet on the boiler body furnace wall, the top of respective combustion chamber is provided with exhanst gas outlet, the boiler body bottom is provided with the slag outlet, the igniting air compartment of corresponding air distribution plate below is provided with blast inlet one time on the boiler body furnace wall: above-mentioned separator is arranged on the smoke outlet of boiler body, the dust mouth of the material returning device that is connected with separator is connected with circulating ash ash inlet on the boiler body furnace wall by pipeline, and tail vertical well gas flue is arranged on the smoke outlet of separator, and be connected with fly-ash separator; The bottom of mud storeroom is provided with defeated mud mouth, and the top is provided with the air outlet; The defeated mud mouth of mud storeroom below is provided with spiral pump, and the sludge carrier pipe that is connected with spiral pump inserts in the boiler body, and insertion end is provided with sludge spray head; Primary air fan is provided with first blast inlet and second blast inlet, the pneumatic tube that is connected with the air outlet at mud storeroom top is connected with first blast inlet of primary air fan, the air outlet tube of primary air fan is connected with first air preheater, and the air outlet tube of first air preheater inserts a blast inlet of boiler body.
The pneumatic tube that air outlet above-mentioned and mud storeroom top is connected also has the gas transmission control valve, and the gas transmission control valve is positioned at the junction of pneumatic tube and air outlet, mud storeroom top.When circular fluid bed being carried out necessary maintenance, can enter circular fluid bed to stop the dusty gas in the mud storeroom by closing this gas transmission control valve.
In the said system, circular fluid bed also is provided with drum, also from top to bottom sets gradually superheater and economizer in the tail vertical well gas flue, and the top of first air preheater also is provided with second air preheater; The water wall that links to each other with drum also is set in the boiler body combustion chamber, and economizer is connected with drum, and drum is connected with superheater, and the middle and lower part of combustion chamber also is provided with the secondary air mouth, and this secondary air mouth is positioned at the sludge spray head below; First air preheater also is connected with material returning device by pipeline, and primary air fan also has the pipeline that is connected with second air preheater, and the air outlet tube of second air preheater is connected with the secondary air mouth of boiler body.
Above-mentioned first air preheater can also be drawn one road pipeline and is connected with material returning device, as the blast pipe of returning charge wind.
Said system also has steam blowing equipment; Sludge carrier pipe also is provided with the sweep gas import, and this sweep gas import is positioned near the sludge spray head; Drum also is provided with the sweep gas outlet; Blow device has scavenging duct, purges first control valve and purges second control valve; One end of scavenging duct is the sweep gas import, and this port exports airtight the connection with the sweep gas of drum, and the other end of scavenging duct is sweep gas outlet, the airtight connection of sweep gas import of this port and sludge carrier pipe; Purge the junction that first control valve is arranged on the pipeline of scavenging duct and is positioned at scavenging duct and sludge carrier pipe, purge second control valve be arranged on the pipeline of sludge carrier pipe and between the sweep gas import of spiral pump and sludge carrier pipe, and near the sweep gas import of sludge carrier pipe.
Above-mentioned steam blowing equipment purges can also be provided with the 3rd control valve, and the 3rd control valve is arranged on the pipeline of scavenging duct and is positioned at the junction of scavenging duct and drum.When sludge spray head not being purged, steam enters scavenging duct in the drum to avoid can to close the 3rd control valve.
Said system also has high pressure water cleaning device, and sludge carrier pipe also is provided with the high pressure water import, and this high pressure water import is between purging second control valve of spiral pump and sludge carrier pipe, also near purging second control valve; High pressure water cleaning device has wash tube and purge control valve, and an end of wash tube is the high pressure water import, and this port is connected with high-pressure water, and the other end of wash tube is high pressure water outlet, the airtight connection of high pressure water import of this port and sludge carrier pipe; Purge control valve is arranged on the pipeline of wash tube, and is positioned at the junction of wash tube and sludge carrier pipe.
The combustion chamber of above-mentioned circular fluid bed is that the boundary can be divided into two districts with the secondary air inlet.Below the secondary air inlet is macroparticle reducing atmosphere combustion zone, promptly close phase combustion zone; More than the secondary air inlet is small-particle oxidizing atmosphere combustion zone, i.e. dilute phase combustion zone.The combustion processes of fuel, sweetening process, NO and N
2Generation and the decomposition course of O are mainly finished in the combustion chamber.Be furnished with water wall in the combustion chamber, it finishes the transmittance process of about 50% fuel heat release amount.The combustion chamber of circular fluid bed is a combustion equipment, also is a desulfurization, nitrogen rejection facility, and afflux process, burning, heat transfer and desulfurization, denitrification reaction are in one.
The present invention has positive effect: the water ratio that (1) the present invention directly burns municipal wastewater treatment plant is up to 75%～85% dewatered sludge, no longer need the higher dewatered sludge of this water ratio is made drying and other treatment, so compare with existing sludge anhydration burning technology, have simple, the lower-cost advantage of technology.(2) Combustion technology of circulating fluidized is a kind of novel clean burning technology, and it has efficiency of combustion height, wide, the easy after-flame of particle of load setting range, low, the stove internal combustion intensity advantages of higher of pollutant discharge amount; When adopting the dewatered sludge of circulating fluidized bed burning disposal municipal wastewater treatment plant in the present invention, although the water ratio of dewatered sludge is up to 75%～85%, but because coal and dewatered sludge in the burner hearth are that Boiling Combustion and combustion chamber temperature can reach 850 ℃～900 ℃, so the dewatered sludge in sludge spray head is injected into the combustion chamber is heated rapidly, mummification and detonation takes place, promptly have burning rapidly, advantage such as sufficient combustion, combustion stability be good, and the organism in the dewatered sludge can 100% be burnt.(3) circulating fluidized bed has the effect that suppresses NOx and CO generation, because the temperature of combustion in the circulating fluidized bed combustor is 850 ℃～900 ℃, and N
2Generally need greater than 1300 ℃ the time, just can generate NOx in a large number,, guarantee that the interior reasonably oxygen concn of stove distributes, so also just greatly reduce the generation of NOx and CO in addition because circular fluid bed can adopt the combustion-supporting control of air stage feeding.(4) when in circulating fluidized bed, adding coal, can in coal, mix sweetening agent, be used for desulfurization in the combustion processes of coal and dewatered sludge, thereby effectively reduce the content of sulphur in the tail gas that the burning back produces.(5) circular fluid bed can also suppress the generation of dioxin.Mud produces dioxin when burning general condition is that combustion instability, combustion chamber internal combustion non-uniform temperature, temperature of combustion are lower than below 600 ℃ or with the medium of katalysis.But circulating fluidized bed is when burning coal, dewatered sludge evaporable gas and dewatered sludge, the temperature of its combustion chamber is higher than 850 ℃, and dewatered sludge has, and wind of combustion-supporting and intensive of coal stirs, mixing effect, guaranteed the stable, abundant of dewatered sludge and coal combustion, and make in the combustion chamber temperature even, so effectively suppress the generation of dioxin.(6) method of the present invention has the advantage that technology is simple, cost is low, is that the treatment scale of 80% dewatered sludge is as the criterion to burn 200 tons of water ratio every day, and its working cost can be reduced to 100 yuan/ton, is significantly less than to adopt other method to handle the working cost of mud.In addition, system of the present invention can obtain through simple the transformation, thereby can implement method of the present invention on the basis of the existing circular fluid bed of heat power plant afterwards, can save greatly like this and implement expense of the present invention, make the present invention have huge economic benefit and environmental benefit.
Description of drawings
Fig. 1 is the sludge incineration treatment system of embodiment 1.
Fig. 2 is the local enlarged diagram of A part among Fig. 1.
Fig. 3 is the local enlarged diagram of B part among Fig. 1.
Embodiment
(embodiment 1, sludge incineration treatment system)
See Fig. 1 to Fig. 3, the sludge incineration treatment system in the present embodiment has circular fluid bed 1, fly-ash separator (this fly-ash separator 2 is electrostatic precipitator, and its model is FAA3 * 35M-44-55A2, purchases in Shanghai Metallurgy Mine Machinery Factory) 2 and mud storeroom 3; Circular fluid bed 1 comprises boiler body 11, tail vertical well gas flue 12, separator (this separator is a whirlwind separator) 13, material returning device 14, primary air fan 15 and drum 16; Primary air fan 15 is provided with first blast inlet 15-1 that is used for importing the dusty gas that dewatered sludge produces at storage and the second blast inlet 15-2 that is used for input air, from top to bottom sets gradually superheater 12-1, economizer 12-2, the second air preheater 12-4 and the first air preheater 12-3 in the tail vertical well gas flue 12; Be provided with air distribution plate 11-1 in the described boiler body, air distribution plate 11-1 below is igniting air compartment 11-5, air distribution plate 11-1 top is combustion chamber 11-2, the water wall 11-4 that links to each other with drum 16 also is set among the 11-2 of combustion chamber, economizer 12-2 is connected with drum 16 by coupled pipeline, drum 16 is connected with superheater 12-1 by coupled pipeline, respective combustion chamber 11-2 bottom is provided with coal inlet 11-2-1 and circulating ash ash inlet 11-2-4 on the boiler body furnace wall, the middle and lower part of respective combustion chamber 11-2 is provided with secondary air mouth 11-2-3, and this secondary air mouth 11-2-3 is positioned at sludge spray head 11-3 below; The top of respective combustion chamber 11-2 is provided with exhanst gas outlet 11-2-5, and the boiler body bottom is provided with slag outlet 11-2-2, and corresponding air distribution plate 11-1 below igniting air compartment 11-5 is provided with blast inlet 11-1-1 one time on the boiler body furnace wall; Above-mentioned separator 13 is arranged on boiler body exhanst gas outlet 11-2-5 place, the dust mouth of the material returning device 14 that is connected with separator 13 is connected with circulating ash ash inlet 11-2-4 on the boiler body furnace wall by pipeline, and tail vertical well gas flue 12 is arranged on the smoke outlet of separator 13 and is connected with fly-ash separator 2; The bottom of mud storeroom 3 is provided with defeated mud mouth 3-1, and the top is provided with air outlet 3-2, and the defeated mud mouth 3-1 of mud storeroom below is provided with spiral pump 31, and the sludge carrier pipe 33 that is connected with spiral pump 31 inserts in the boiler body, and insertion end is provided with sludge spray head 11-3; The pneumatic tube 32 that is connected with the air outlet 3-2 at mud storeroom 3 tops is connected with the first blast inlet 15-1 of primary air fan 15, the air outlet tube of primary air fan 15 is divided into two-way, one the tunnel is connected with the first air preheater 12-3, the air outlet tube of first air preheater also divides two-way, one the road inserts a blast inlet 11-1-1 of boiler body, and material returning device is inserted on another road; Another road air outlet tube of primary air fan 15 is connected with the second air preheater 12-4, and the air outlet tube of the second air preheater 12-4 is connected with the secondary air mouth 11-2-3 of boiler body.
The pneumatic tube 32 that is connected with the air outlet 3-2 at mud storeroom 3 tops also has gas transmission control valve 34, and gas transmission control valve 34 is positioned at the junction of pneumatic tube 32 and mud storeroom top air outlet 3-2.
Because dewatered sludge is bonded in sludge spray head 11-3, sludge carrier pipe 33 and the spiral pump 31 easily it is stopped up, influence the normal operation of native system.So the sludge incineration treatment system in the present embodiment also has steam blowing equipment 4; Sludge carrier pipe 33 also is provided with sweep gas import 33-1, and this sweep gas import 33-1 is positioned near the sludge spray head 11-3; Drum 16 also is provided with sweep gas outlet 16-1; Steam blowing equipment 4 has scavenging duct 41, purges first control valve 42, purges second control valve 43 and purge the 3rd control valve 44; One end of scavenging duct 41 is sweep gas import 41-1, and 16-1 is airtight is connected in the sweep gas outlet of this port and drum 16, and the other end of scavenging duct 41 is sweep gas outlet 41-2, the airtight connection of sweep gas import 33-1 of this port 41-2 and sludge carrier pipe; Purge the junction that first control valve 42 is arranged on the pipeline of scavenging duct 41 and is positioned at scavenging duct 41 and sludge carrier pipe 33, purge that second control valve 43 is arranged on the pipeline of sludge carrier pipe 33 and between the sweep gas import 33-1 of spiral pump 31 and sludge carrier pipe 33, and the sweep gas import 33-1 of close sludge carrier pipe; Purge the junction that the 3rd control valve 44 is arranged on the pipeline of scavenging duct 41 and is positioned at scavenging duct 41 and drum 16.
The sludge incineration treatment system also has high pressure water cleaning device 5 in the present embodiment, sludge carrier pipe 33 also is provided with high pressure water import 33-2, and this high pressure water import 33-2 is between purging second control valve 43 of spiral pump 31 and sludge carrier pipe, also near purging second control valve 43; High pressure water cleaning device 5 has wash tube 51 and purge control valve 52, one end of wash tube 51 is high pressure water import 51-1, this port 51-1 is connected with high-pressure water, the other end of wash tube 51 is high pressure water outlet 51-2, the airtight connection of high pressure water import 33-2 of this port 51-2 and sludge carrier pipe 33; Purge control valve 52 is arranged on the pipeline of wash tube 51, and is positioned at the junction of wash tube 51 and sludge carrier pipe 33.
The sludge incineration treatment system also has some utility appliance in the present embodiment: the induced draft fan 61 that links to each other with fly-ash separator 2, the chimney 62 that links to each other with induced draft fan, the flying dust storehouse 63 that links to each other with the flying dust outlet of fly-ash separator 2, slag storehouse 64 with the slag outlet 11-2-2 of circular fluid bed bottom part body links to each other is used for the feeder 65 to combustion chamber coal supply and Wingdale (sweetening agent).
(embodiment 2, sludge incineration processing method)
See Fig. 1 to Fig. 3, the sludge incineration treatment system that the used sludge incineration treatment system of present embodiment is embodiment 1.
The gravity thickened sludge of certain municipal wastewater treatment plant is carried out processed and obtains water ratio through belt filter press is 75%～85% dewatered sludge.The principal feature of belt filter press is to utilize the tension force of filter cloth and pressure on filter cloth mud to be exerted pressure to make its dehydration, does not need vacuum or pressure exerting device, and power consumption is few, can operate continuously.Use belt filter press the water ratio of dewatered sludge can be reduced to 75%～85%, and do not increase the mud cake amount, dewatered sludge still can keep high calorific value.National Coal Quality supervision and inspection center is delivered in this dewatered sludge sampling detect, the main chemical compositions detected result sees Table 1, and the heavy metal composition detection the results are shown in Table 2.
Table 1
With the dewatered sludge carrying to mud storeroom 3, utilize spiral pump 31 dewatered sludge in the mud storeroom 3 to be delivered among the sludge spray head 11-3 then by coupled sludge carrier pipe 33, and the pressure that utilizes spiral pump to produce is injected into dewatered sludge just in the 11-2 of the combustion chamber of Boiling Combustion from sludge spray head 11-3, after dewatered sludge is injected among the 11-2 of combustion chamber, because of the influence that is subjected to high ambient temperatures gas friction resistance is torn into small-particle, thereby greatly increased the surface-area of dewatered sludge, the moisture in the dewatered sludge of fine granularity can be made the dewatered sludge detonation by instantaneous vaporization in the high temperature gas flow of fluidized-bed combustion boiler combustion chamber 11-2.The Coal-fired capacity of circular fluid bed 1 is 3T/h in the present embodiment, and combustion mud amount is 1T/h; Temperature among the 11-2 of combustion chamber can reach 850 ℃～900 ℃; The dusty gas that mud is produced in storeroom is transported in first blast inlet of primary air fan through pneumatic tube 32 simultaneously, this dusty gas and the air of being sent into by second blast inlet of primary air fan are divided into three the tunnel, one the tunnel enters a blast inlet 11-1-1 of boiler body after the first air preheater 12-3 preheating, and behind air distribution plate 11-1 conversion wind direction, enter among the 11-2 of combustion chamber coal and Wingdale are blown to boiling, one the tunnel enters material returning device 14 after the first air preheater 12-3 preheating, for material returning device provides returning charge wind, another road second air preheater 12-4 preheating, and enter among the 11-2 of combustion chamber so that dewatered sludge and coal fully burn through the secondary air mouth 11-2-3 of boiler body.The slag that produces among the 11-2 of combustion chamber drains into slag storehouse 64 through the slag outlet 11-2-2 of boiler body bottom, and sampling detects its heavy metal content to slag in slag storehouse 64, and its detected result sees Table 2.The flue gas that produces among the 11-2 of combustion chamber enters separator 13 through the exhanst gas outlet 11-2-5 on top, combustion chamber, this separator is a whirlwind separator, 13 pairs of flue gases of separator carry out the solid and gas separating treatment, solid particulate bigger in the flue gas is through material returning device 14, circulating ash ash inlet 11-2-4 on the boiler body and enter the combustion chamber and carry out circulating combustion, to improve efficiency of combustion, remaining flue gas (mainly being gas and short grained solid) enters tail vertical well gas flue 12, process superheater 12-1 in tail vertical well gas flue 12, economizer 12-2, the heat exchange of the second air preheater 12-4 and the first air preheater 12-3 enters fly-ash separator 2 after handling, fly-ash separator 2 further separates with the small-particle solid the gas in the flue gas, electrostatic precipitator 2 is that short grained Solid Conveying and Melting is to flying dust storehouse 63 with the flying dust of collecting, to send into chimney 62 dischargings through induced draft fan 61 through the flue gas that electrostatic precipitation is handled, at smoke stack emission mouth place discharged flue gas is got 3 samples and detect, its detected result sees Table 3.
In the process of above-mentioned burning and processing sludge, outside water enters drum 16 after economizer 12-2 preheating, carry out heat exchange and in drum 16, produce high-pressure saturated steam thereby the water in the drum enters water wall 11-4, this saturation steam is through the further heating of superheater 12-1 and obtain superheated vapour, and superheated vapour can be used to generating or directly flows to the client as thermal source.In the method for above-mentioned burning and processing sludge, the slag that obtains can be used for brickmaking, pave the way, and flying dust can be used to make cement.
When circular fluid bed 1 being carried out necessary maintenance, can enter circular fluid bed 1 with the dusty gas that stops dewatered sludge in mud storeroom 2, to produce and influence maintenance by closing this gas transmission control valve 34.
Because dewatered sludge is bonded on sludge spray head 11-3, sludge carrier pipe 33 and the spiral pump 31 easily it is stopped up, influence the normal enforcement of present method, so need not timing clean sludge splash head 11-3 and spiral pump 31.Utilize steam blowing equipment 4 to purge the dewatered sludge that is bonded among the sludge spray head 11-3 clean easily.Blowing method is to close spiral pump 31 and purging second control valve 43 that is located on the sludge carrier pipe 33 earlier, open the purging that is arranged on the scavenging duct 41 first control valve 42 again and purge the 3rd control valve 44, high-pressure saturated steam in the drum 16 is dashed through scavenging duct to sludge spray head 11-3, it is purged.Utilize high pressure water cleaning device 5 easily the dewatered sludge that is bonded in sludge carrier pipe 33 and the spiral pump 31 to be cleaned up, purging method is to close spiral pump 31 and purging second control valve 43 that is located on the sludge carrier pipe 33 earlier, open the purge control valve 52 that is arranged on the wash tube 51 again, make high pressure water dash to sludge carrier pipe 33 and spiral pump 31 and it is cleaned through wash tube 51.
Table 2
Table 3
In addition, data are the related data that in the present embodiment slag institute sample thief is detected in the table 2, because there is not cindery discharging standards, the spy together provides the discharging standards of agricultural mud as the reference data in table 2.Detection data in the table 2 show, the concentration of heavy metal heavy metal concentration in the dewatered sludge shows the fixed and form stable of heavy metal in the lime-ash in the slag of measuring according to lixiviation process.
Data are the related data that in the present embodiment discharge tail gas institute sample thief is detected in the table 3, and together provide consumer waste incineration pollution control criterion (GWKB3-2000) conduct with reference to data in table 3.Wherein the unit that sample is carried out the dioxin check and analysis is that Belgian SGS dioxin assay laboratory, detection method are that the EN1948 of European Union method, detecting instrument are Autospec Ultima HRGC/HRMS, detection data in the table 3 and consumer waste incineration are polluted the control criterion contrast as can be known, and the fume emission in the present embodiment meets national requirements fully.
By embodiment as can be known, system of the present invention can be on the basis of the existing circular fluid bed of heat power plant, through obtaining after simple the transformation, thereby can implement method of the present invention, can save greatly like this and implement expense of the present invention, make the present invention have huge economic benefit and environmental benefit.
Claims (10)
1, a kind of sludge incineration processing method, it is characterized in that: the method for being taked is as follows: with water ratio is that 75%～85% dewatered sludge is delivered in the COMBUSTION IN CIRCULATION FLUIDIZED BED chamber, the dusty gas that dewatered sludge produces in storage is sent in the COMBUSTION IN CIRCULATION FLUIDIZED BED chamber, and dewatered sludge, dusty gas burn with coal; Burning the tail gas that produces discharges after treatment.
2, sludge incineration processing method according to claim 1 is characterized in that: it is with spiral pump dewatered sludge to be injected into from sludge spray head in the COMBUSTION IN CIRCULATION FLUIDIZED BED chamber through sludge carrier pipe that dewatered sludge is delivered in the COMBUSTION IN CIRCULATION FLUIDIZED BED chamber.
3, sludge incineration processing method according to claim 2 is characterized in that: need not timing clean sludge splash head in the above-mentioned process that dewatered sludge is injected into circulating fluidized bed combustor, to prevent the dehydrated sludge blockage of sludge spray head.
4, sludge incineration processing method according to claim 3, it is characterized in that: the method for not timing clean sludge splash head is being used to of being connected with sludge spray head to be set import the scavenging duct that has control valve of the high-pressure saturated steam of circular fluid bed generation, utilizes high-pressure saturated steam to purge to be bonded in the dewatered sludge in the sludge spray head.
5, sludge incineration processing method according to claim 2, it is characterized in that: in the above-mentioned process that dewatered sludge is injected into circulating fluidized bed combustor, need not timing clean sludge transfer lime and spiral pump, to prevent the dehydrated sludge blockage of sludge carrier pipe and spiral pump; The method of not timing clean sludge transfer lime and spiral pump is the wash tube that has control valve that is used to import high pressure water be connected with sludge carrier pipe is set, is provided for stoping high pressure water to pour the control valve of burning in circulating fluid bed boiler chamber on sludge carrier pipe, utilizes high pressure water to clean to be bonded in the dewatered sludge in sludge carrier pipe and the spiral pump.
6, according to the described sludge incineration processing method of one of claim 1～5, it is characterized in that: in coal, add sweetening agent; The weight ratio of sweetening agent, dewatered sludge, coal is 1.5～4: 20～30: 70～80.
7, a kind of sludge incineration treatment system has circular fluid bed (1), fly-ash separator (2); Circular fluid bed (1) comprises boiler body (11), tail vertical well gas flue (12), separator (13), material returning device (14), primary air fan (15); Be provided with first air preheater (12-3) in the tail vertical well gas flue (12); Be provided with air distribution plate (11-1) in the described boiler body, air distribution plate (11-1) top is combustion chamber (11-2), respective combustion chamber on the boiler body furnace wall (11-2) bottom is provided with coal inlet (11-2-1) and circulating ash ash inlet (11-2-4), the top of respective combustion chamber (11-2) is provided with exhanst gas outlet (11-2-5), the boiler body bottom is provided with slag outlet (11-2-2), and corresponding air distribution plate (11-1) below igniting air compartment (11-5) is provided with a blast inlet (11-1-1) on the boiler body furnace wall; Above-mentioned separator (13) is arranged on boiler body exhanst gas outlet (11-2-5) and locates, the dust mouth of the material returning device (14) that is connected with separator (13) is connected with circulating ash ash inlet (11-2-4) on the boiler body furnace wall by pipeline, and tail vertical well gas flue (12) is arranged on the smoke outlet of separator (13) and is connected with fly-ash separator (2); It is characterized in that: native system also has mud storeroom (3), the bottom of mud storeroom (3) is provided with defeated mud mouth (3-1), the top is provided with air outlet (3-2), the defeated mud mouth (3-1) of mud storeroom below is provided with spiral pump (31), the sludge carrier pipe (33) that is connected with spiral pump (31) inserts in the boiler body, and insertion end is provided with sludge spray head (11-3); Primary air fan (15) is provided with first blast inlet (15-1) and second blast inlet (15-2), the pneumatic tube (32) that is connected with the air outlet (3-2) at mud storeroom (3) top is connected with first blast inlet (15-1) of primary air fan (15), the air outlet tube of primary air fan (15) is connected with first air preheater (12-3), and the air outlet tube of first air preheater inserts a blast inlet (11-1-1) of boiler body.
8, sludge incineration treatment system according to claim 7, it is characterized in that: circular fluid bed (1) also is provided with drum (16), also from top to bottom set gradually superheater (12-1) and economizer (12-2) in the tail vertical well gas flue (12), the top of first air preheater (12-3) also is provided with second air preheater (12-4); The water wall (11-4) that links to each other with drum (16) also is set in the combustion chamber of boiler body (11-2), economizer (12-2) is connected with drum (16), drum (16) is connected with superheater (12-1), the middle and lower part of combustion chamber (11-2) also is provided with secondary air mouth (11-2-3), and this secondary air mouth is positioned at sludge spray head (11-3) below; First air preheater (12-3) also is connected with material returning device (14) by pipeline; Primary air fan (15) also has the pipeline that is connected with second air preheater (12-4), and the air outlet tube of second air preheater (12-4) is connected with the secondary air mouth (11-2-3) of boiler body.
9, sludge incineration treatment system according to claim 8 is characterized in that: native system also has steam blowing equipment (4); Sludge carrier pipe (33) also is provided with sweep gas import (33-1), and this sweep gas import (33-1) is positioned near the sludge spray head (11-3); Drum (16) also is provided with sweep gas outlet (16-1); Blow device (4) has scavenging duct (41), purges first control valve (42) and purges second control valve (43); (16-1) is airtight is connected in the sweep gas outlet of one end of scavenging duct (41) and drum (16), the airtight connection of sweep gas import (33-1) of the other end of scavenging duct (41) and sludge carrier pipe; Purge the junction that first control valve (42) is arranged on the pipeline of scavenging duct (41) and is positioned at scavenging duct (41) and sludge carrier pipe (33), purge second control valve (43) be arranged on the pipeline of sludge carrier pipe (33) and be positioned between the sweep gas import (33-1) of spiral pump (31) and sludge carrier pipe (33), and the sweep gas import (33-1) of close sludge carrier pipe.
10, sludge incineration treatment system according to claim 9, it is characterized in that: native system also has high pressure water cleaning device (5), sludge carrier pipe (33) also is provided with high pressure water import (33-2), and this high pressure water import (33-2) is positioned between purging second control valve (43) of spiral pump (31) and sludge carrier pipe, and near purging second control valve (43); High pressure water cleaning device (5) has wash tube (51) and purge control valve (52), and an end of wash tube (51) is connected with high-pressure water, and the other end of wash tube (51) advances with the high pressure water of sludge carrier pipe (33) that (33-2) is airtight to be connected; Purge control valve (52) is arranged on the pipeline of wash tube (51), and is positioned at the junction of wash tube (51) and sludge carrier pipe (33).
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| CNB2005100384163A CN1270988C (en) | 2005-03-14 | 2005-03-14 | Sludge burning treatment method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100384163A CN1270988C (en) | 2005-03-14 | 2005-03-14 | Sludge burning treatment method and system |
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| CN1270988C true CN1270988C (en) | 2006-08-23 |
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101161599B (en) * | 2006-10-10 | 2011-02-09 | 张民良 | Chain track enterclose type anoxia ebb fried drying, burning and burningcandle decomposition apparatus |
| CN101694299A (en) * | 2009-10-21 | 2010-04-14 | 吴跃平 | Method for eliminating sludge through combustion |
| CN102297435A (en) * | 2011-02-09 | 2011-12-28 | 张玉新 | Horizontal active sludge incinerator and process realizing temperature adjustment and secondary exhaust gas combustion |
| CN102311215B (en) * | 2011-07-30 | 2012-11-21 | 华电电力科学研究院 | Urban life sludge locally self-circulation comprehensive utilization device and method |
| CN103626373A (en) * | 2012-08-21 | 2014-03-12 | 绍兴县永通丝绸印染有限公司 | Sludge dewatering system for printing and dyeing mill |
| CN102923923A (en) * | 2012-10-12 | 2013-02-13 | 北京水泥厂有限责任公司 | Method for reducing nitric oxides by using disposed sludge |
| CN103398387B (en) * | 2013-08-16 | 2015-12-02 | 南京创能电力科技开发有限公司 | A kind of burning mixed mud system automatically |
| CN103884015B (en) * | 2014-03-20 | 2016-01-06 | 湖州荣恒不锈钢有限公司 | Recirculating fluidized bed garbage sludge incinerator |
| CN104176896B (en) * | 2014-08-26 | 2016-04-13 | 重庆双辉环保工程有限公司 | A kind of drying sludge treatment process |
| CN105180176A (en) * | 2015-09-30 | 2015-12-23 | 上海市城市建设设计研究总院 | Dried sludge conveying system with wind distribution branch and treatment method |
| CN105157042A (en) * | 2015-09-30 | 2015-12-16 | 上海市城市建设设计研究总院 | Conveying system and processing method for powder granule sludge |
| CN105114963A (en) * | 2015-09-30 | 2015-12-02 | 上海市城市建设设计研究总院 | Conveying system for dried sludge |
| CN106287747B (en) * | 2016-08-18 | 2018-10-19 | 哈尔滨工业大学 | Sludge heat drying and burning integral and exhaust gas cleaner |
| CN107490006A (en) * | 2017-09-14 | 2017-12-19 | 厦门瑞新热电有限公司 | A kind of sludge incineration processing method |
| CN110030561A (en) * | 2019-05-20 | 2019-07-19 | 青岛振华绿能能源科技有限公司 | A kind of sludge incineration processing method |
| CN112413606A (en) * | 2020-11-20 | 2021-02-26 | 北京首钢生物质能源科技有限公司 | Domestic waste and municipal sludge harmless cooperative treatment equipment |
| CN114811596B (en) * | 2022-04-29 | 2023-01-31 | 江苏锦明再生资源有限公司 | Dry sludge treatment cleaning incinerator |
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