CN105038822A - Sludge clean treatment method and device - Google Patents

Sludge clean treatment method and device Download PDF

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Publication number
CN105038822A
CN105038822A CN201510407727.6A CN201510407727A CN105038822A CN 105038822 A CN105038822 A CN 105038822A CN 201510407727 A CN201510407727 A CN 201510407727A CN 105038822 A CN105038822 A CN 105038822A
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mud
gas
sludge
phase
unit
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CN201510407727.6A
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CN105038822B (en
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邹大冰
谢红
柯水洲
唐生誉
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长沙泥宝环保有限公司
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Abstract

The invention provides a sludge clean treatment method comprising the following steps: sludge to be treated is preheated, and is dried in a sealed space under a temperature no higher than 250 DEG C; the sludge is charred in a sealed space under a temperature no higher than 300 DEG C, such that sludge water content is reduced to below 30%; the sludge is dry-distilled under an anaerobic condition under a temperature of 550-700 DEG C, such that solid-phase residue and a gas-phase product are respectively obtained; the solid-phase residue is recovered as biochar; the gas-phase product is subjected to separation, decomposition and purification treatments, such that dischargeable water, wood vinegar liquid, wood tar and combustible gas are respectively obtained. The invention also provides a sludge clean treatment device. According to the invention, based on sludge characteristics, a drying-charring-dry distillation technology is adopted, such that organic components in sludge are converted into combustible gas, and the solid residue is recycled. Therefore, sludge heat value is fully utilized, sludge can be utilized as a resource, and low-cost clean treatment is realized.

Description

A kind of cleaning method of mud and device

Technical field

The invention belongs to field of environment engineering technology, be specifically related to a kind of clean technique and treatment unit of mud.

Background technology

According to " Chinese sludge disposal Market Report (2013) " prediction, by the end of 2015, national urbanization water treatment plant mud (water ratio 80%) generation that wets will reach 3,359 ten thousand tons, i.e. daily output 9.2 ten thousand tons, mud.China disposes the process of mud and relatively lags behind owing to affecting by the factor of the aspects such as fund, sludge stabilization rate is low, harmless treatment rate is not high, process disposal technology is single, and it is with high costs, cause most of mud unprocessed or after only doing simple process, just direct agricultural, landfill or send refuse tip landfill, burning, sludge landfill characteristics etc., what have even arbitrarily stacks.Random landfill or random stacking of mud take a large amount of land resources, and the perishable fouling of mud, and it produces the surface water bodies such as the easy contaminated soil of percolate, underground water and river, lake, ocean, causes serious secondary pollution to environment.In addition, the heavy metal in mud and toxic organic compound by the food chain Migration And Concentration in ecology, and can burn generation toxic gas, produce harm potential for a long time to ecotope and HUMAN HEALTH.Therefore, reducing sludge treatment cost and improving sludge treatment effect is current China sludge treatment urgent problem.

The residual active sludge of municipal sludge mainly sewage work, mainly containing large quantity of moisture, and other microorganisms and residue thereof, based on organism in residue, and nutritive substance and the organic matter such as nitrogenous, phosphorus.Because mud contains a large amount of organic composition, being the major reason that mud pollutes, is also the important foundation of recycling sludge.

At present, domestic urban wastewater treatment firm specific resistance to filtration technology mainly contains anaerobic sludge digestion technology, sludge aerobic fermentation technique, sludge landfill characteristics technology, sludge incineration technology; Wherein sludge incineration technology comprises: sludge heat drying technology, separately incineration technology and low-temperature carbonization technology etc., up to the present also do not have a kind of technology the resource in mud to be made full use of.

Summary of the invention

The present invention overcomes the defect of prior art, a kind of novel mud clean technique is provided, specifically sewage treatment plant residual mud is carried out low-temperature carbonization and then carry out low-temperature pyrolysis, obtained inflammable gas, inflammable gas is used for the supply of technique self heat energy, make full use of sludge calorific value, realize the low cost recycling of mud.

The first object of the present invention is to provide a kind of cleaning method of mud.

Specifically, said method comprising the steps of:

(1) by after pending mud preheating, be no more than the enclosed space inner drying of 250 DEG C in temperature, make the water ratio of mud be down to 30 ~ 40%, then carbonize in the enclosed space that temperature is no more than 300 DEG C, make the water ratio of mud be down to less than 30%;

(2) get the mud after step (1) process, under the oxygen free condition of 550 ~ 700 DEG C, destructive distillation 10 ~ 80min, obtains solid phase residue and gas-phase product respectively; Described solid phase residue is reclaimed as biological carbon;

(3) step (2) gained gas-phase product is carried out cooling, being separated, obtain gas and mixing liquid respectively; Described gas is carried out aftertreatment, is described drying, charing, destructive distillation energy supply as combustion gas; Described mixing liquid is carried out water separating of oil; Gained aqueous phase qualified discharge after treatment; Gained oil phase, through separation, decomposition, purifying, obtains wood vinegar, wood tar oil and combustible gas.

Pending mud of the present invention is sewage work's remaining mud after sewage disposal.The water ratio of described pending mud is not less than 50%.In described pending mud, organic content is not less than 40%, is preferably 40 ~ 60%.

During the described charing of step (1), the temperature of enclosed space is preferably no more than 270 DEG C.

As a kind of preferred version, described step (1) is specially: after pending mud preheating, in the enclosed space of 200 ~ 250 DEG C, carry out indirect heat exchange with thermal oil, makes the water ratio of mud be down to 30 ~ 40%; In the enclosed space of 250 ~ 270 DEG C, carry out indirect heat exchange with thermal oil again, make the water ratio of mud be down to less than 30%.

Described thermal oil is for recycling.The temperature of thermal oil is preferably 220 ~ 240 DEG C.

In described step (2), available rare gas element, as nitrogen replacement oxygen, thus oxygen-free environment when realizing destructive distillation.

When after step (1) process, the water ratio of mud is 10 ~ 30%, the destructive distillation described in step (2) is preferably: destructive distillation 12 ~ 75min under the oxygen free condition of 600 ~ 700 DEG C, obtains solid phase, gas-phase product respectively.

When after step (1) process, the water ratio of mud is less than 10%, destructive distillation described in step (2) is preferably: suppress balling-up after mud water ratio being less than 10% mixes with the wood chip accounting for mud weight 15%, under the oxygen free condition of 550 ~ 600 DEG C, destructive distillation 12 ~ 75min, obtains solid phase, gas-phase product respectively.The effect that the present invention adds wood chip mainly improves the carbon content in mud, with the quality of the quality and biomass charcoal that improve combustible gas.

The method of the invention can also comprise the process of waste gas, is specially: waste gas step (1) described drying and charing produced is described pending mud preheating as thermal source, then qualified discharge after treatment.Described process is specially: send in exhaust gas centralized into alkali wash spray tower, removing dust and acidic substance, and then send into low temperature high energy plasma equipment, destroy organic molecule, be oxidized to small organic molecule, then send into alkali wash spray tower by induced draft fan, after oxidation, in and acidic oxide, last qualified discharge.

After gained solid phase residue of the present invention reclaims as biological carbon, carbon-point or agriculture fertilizer can be processed into.

The second object of the present invention is to provide a kind of cleaning device of mud.

Concrete, described device comprises mud plenum system, drying sludge-carbonization system, mud distillation system and the product recovery that order is successively connected.

Described mud plenum system comprises the connected storage bin of order and jacketed screw transfer roller.Described jacketed screw transfer roller can also be connected with flare system by exhaust pipeline.

Described drying sludge-carbonization system comprises the connected low-temperature drier of order and carbonizer, and the entrance of described low-temperature drier is connected with the outlet of described jacketed screw transfer roller.Mud, after low-temperature drier dehydration, reacts further in carbonizer, and by reaction, material water ratio reduces further, and material unit calorific value raises, and makes the Organic carbon of generation have superior combustionproperty.

Described drying sludge-carbonization system is airtight negative pressure system, is also provided with closed-type feed device, airtight drawing mechanism, thus ensure mud turnover time equipment stopping property.

Described low-temperature drier and carbonizer inside are equipped with thermal cycling crosspoint.Described thermal cycling crosspoint comprises the twin shaft hollow blade and crustless sandwich that can fill thermal oil.In actually operating, mud stirs continuously in device, and with the thermal oil indirect heat exchange in described twin shaft hollow blade and crustless sandwich, thermal chemical reaction occurs, sludge water foam structure destroys, and in mud, water is transformed into water vapour and separates from mud.

Described thermal cycling crosspoint is connected with heat-conducting oil furnace.After thermal oil heats in described heat-conducting oil furnace, be delivered in thermal cycling crosspoint by recycle pump, with mud generation heat exchange, the temperature of thermal oil reduced; Flow in heat-conducting oil furnace by back of pipeline after exchange, then heat, so circulate.Described heat-conducting oil furnace can comprise heat-conducting oil furnace body, fuel combustion system, forced draft induced draft system etc.The combustion gas that the thermal source of described heat-conducting oil furnace can obtain after treatment for mud, also can introduce Sweet natural gas is in addition heat-conducting oil furnace heating.

Described low-temperature drier and carbonizer are also connected with described jacketed screw transfer roller respectively through preheating gas pipeline.Mud is successively after low-temperature drier and carbonizer, and the waste heat gas of discharge carries out preheating to supply mud in Cemented filling to jacketed screw transfer roller; After preheating, enter flare system by exhaust pipeline, then discharge up to standard.

Described mud distillation system comprises the connected storage hopper dredger of order and gas retort; The entrance of described storage hopper dredger is connected with the outlet of described carbonizer.The principal feature of described mud distillation system is: 1. mud is heat under anaerobic state, and its product is water vapour, carbonizing gas and carbon granule mainly; 2. the carbon granule that generates of gas retort lignin-sludge and the structural property of wood charcoal powder similar; 3. the water vapor condensation that pyrolyzing sludge produces is water non-pollution discharge, and carbonizing gas is converted into pure combustible gas recycle, and carbonizing gas calorific value is sufficient, can do fuel gas completely; 4. retort process is reduction reaction, can not produce oxynitride and sulfurous gas (main component of acid rain) as burning method; 5. mud pyrolysis temperature is 550 ~ 700 DEG C, whole process is 10 ~ 80 minutes, part heavy metal ion such as Hg etc. in mud, because fusing point is low, can decompose under high temperature action and vapor away, other heavy metal ion such as Pb, Cd, Cr, Ni etc., will be solidificated in carbide product, becomes highly stable and to environment without harm; Although carbonization system can not remove the heavy metal ion in mud, but the data results of dissolution test shows, carburizing reagent can be solidificated in carbonated product, can by the use of safety in all trades and professions.

Described product recovery comprises the biological carbon recovery unit and gas phase recovery unit that are connected with gas retort respectively; Described gas phase recovery unit comprises the decomposition of unit for treating water, wood vinegar and wood tar oil, purification process unit and organic gas processing unit.

Described organic gas processing unit comprise be linked in sequence successively fly-ash separator, organic substance decomposing purification unit, water cooler, combustion gas storage tank; Combustion gas storage tank in described organic gas processing unit is also connected with mud distillation system with described drying sludge-carbonization system respectively through heating pipe line.

Flare system of the present invention can comprise order successively and be connected dedusting except acid unit, plasma deodorization unit, alkali cleaning spray unit, agent-feeding treatment unit and gas vent unit, realizes the process up to standard to waste gas.

Device of the present invention can further include automatic control system.Described automatic control system comprises the temperature control unit controlled the temperature of drying sludge-carbonization system and mud distillation system, to the pressure control unit that the pressure of distillation system controls, and according to the control unit etc. that described temperature controls import hot blast rate and import hot blast temperature.

Device provided by the invention may be used for implementing the method for the invention.

The present invention is based on the characteristic of municipal sludge, adopt drying-charing-retorting technique, the organic composition in mud is transformed into inflammable gas, solid residue is used as carbon-point or agriculture is fertile, really accomplishes to make the best use of everything.Compared with prior art, the present invention at least has following advantages and beneficial effect:

(1) sludge at low temperature charing destructive distillation clean technique of the present invention can make full use of the rear heat formed of carbonizing gas burning that dewatered sludge produces in retort process, be back in sludge drying, charing, retort process, heat energy is reclaimed in recycle, reaches energy-conservation object;

(2) after sludge at low temperature charing destructive distillation clean technique of the present invention carries out low-temperature carbonization destructive distillation to dewatered sludge, not only substantially reduce the number volume and the weight of mud, and farthest save the calorific value of mud, further, product after dewatered sludge charing destructive distillation has the characteristic similar with charcoal, can be used as soil improvement agent and afforestation etc.;

(3) after sludge at low temperature charing destructive distillation clean technique of the present invention carries out low-temperature carbonization destructive distillation to dewatered sludge, heavy metal ion is cured in carbide product, heavy metal relative is stablized, and sludge heavy-metal Leaching can reach the requirement that sludge from wastewater treatment plant disposes emission limit completely;

(4) after sludge at low temperature charing destructive distillation clean technique of the present invention carries out low-temperature carbonization destructive distillation to dewatered sludge, not only circulation and stress heat energy, reduce the energy consumption in sludge treatment, reduce sludge treatment to the pollution of environment, and the byproducts such as the wood vinegar of output high added value, wood tar oil and gac, both had an economic benefit, had social benefit again;

(5) sludge at low temperature charing destructive distillation clean technique of the present invention investment in fixed assets is far below code requirement;

(6) sludge at low temperature charing destructive distillation clean technique of the present invention is suitable for the process of more than 100 tons municipal sludges.

Accompanying drawing explanation

Fig. 1 is the process flow sheet of sludge at low temperature charing destructive distillation clean technique in the embodiment of the present invention 1 and embodiment 2.

Fig. 2 is the schematic diagram of device described in the embodiment of the present invention 3; Wherein 1, storage bin; 2, jacketed screw transfer roller; 3, low-temperature drier; 4, heat-conducting oil furnace; 5, carbonizer; 6, lifting gear; 7, feeding warehouse; 8, gas retort; 9, fly-ash separator; 10, organic substance decomposing purification unit; 11, water cooler; 12, combustion gas storage tank; 13, biological carbon recovery unit; 14, dedusting is except acid unit; 15, plasma deodorization unit; 16, induced draft fan; 17, alkali cleaning spray unit.

Embodiment

Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.If do not specialize, the conventional means that technique means used in embodiment is well known to those skilled in the art, is raw materials usedly commercial goods.

The schema of method described in embodiment 1 and embodiment 2 as shown in Figure 1.

Embodiment 1

100 tons, remaining mud after obtaining sewage disposal from certain municipal sewage plant A, its water content is 80%, and organic content is 40 ~ 60%; Process according to following steps:

(1) by after pending mud preheating, in the enclosed space of 240 DEG C, carry out indirect heat exchange with the thermal oil of 220 ~ 240 DEG C, make the water ratio of mud be down to 40%; In the enclosed space of 270 DEG C, carry out indirect heat exchange with the thermal oil of 220 ~ 240 DEG C again, make the water ratio of mud be down to 28%;

(2) get the mud after step (1) process, under the oxygen free condition of 600 ~ 700 DEG C, destructive distillation 15min, obtains solid phase, gas-phase product respectively; Described solid phase residue is reclaimed as biological carbon;

(3) step (2) gained gas-phase product is carried out cooling, being separated, obtain gas and mixing liquid respectively;

Described gas is carried out aftertreatment, is described drying, charing, destructive distillation energy supply as combustion gas;

Described mixing liquid is carried out water separating of oil; Gained aqueous phase qualified discharge after treatment; Gained oil phase is separated further, purifying obtains wood vinegar and wood tar oil, and wood vinegar and wood tar oil decompose through organic substance decomposing purification unit, become inflammable gas to greatest extent.

Embodiment 2

100 tons, remaining mud after obtaining sewage disposal from certain municipal sewage plant B, its water content is 50%, and organic content is 40 ~ 60%; Process according to following steps:

(1) by after pending mud preheating, in the enclosed space of 240 DEG C, carry out indirect heat exchange with the thermal oil of 220 ~ 240 DEG C, make the water ratio of mud be down to 40%; In the enclosed space of 270 DEG C, carry out indirect heat exchange with the thermal oil of 220 ~ 240 DEG C again, make the water ratio of mud be down to 10%;

(2) get step (1) process after mud, with 15% wood chip mix after suppress balling-up, under the oxygen free condition of 550 ~ 600 DEG C, destructive distillation 15min, obtains solid phase, gas-phase product respectively; Described solid phase residue is reclaimed as biological carbon;

(3) step (2) gained gas-phase product is carried out cooling, being separated, obtain gas and mixing liquid respectively;

Described gas is carried out aftertreatment, is described drying, charing, destructive distillation energy supply as combustion gas;

Described mixing liquid is carried out water separating of oil; Gained aqueous phase qualified discharge after treatment; Gained oil phase is separated further, purifying obtains wood vinegar and wood tar oil, and wood vinegar and wood tar oil decompose through organic substance decomposing purification unit, become inflammable gas to greatest extent.

Embodiment 3

A kind of cleaning device (shown in figure 2) of mud; Described device comprises mud plenum system, drying sludge-carbonization system, mud distillation system and the product recovery that order is successively connected;

Described mud plenum system comprises the connected storage bin 1 of order and jacketed screw transfer roller 2;

Described drying sludge-carbonization system comprises the connected low-temperature drier 3 of order and carbonizer 5, and the entrance of described low-temperature drier is connected with the outlet of described jacketed screw transfer roller 2; Described low-temperature drier and carbonizer are also connected with described jacketed screw transfer roller 2 respectively through preheating gas pipeline;

Described low-temperature drier and carbonizer inside are equipped with thermal cycling crosspoint; Described thermal cycling crosspoint comprises the twin shaft hollow blade and crustless sandwich that can fill thermal oil; Described thermal cycling crosspoint is connected with heat-conducting oil furnace 4;

Described mud distillation system comprises the connected storage hopper dredger of order and gas retort 8; The entrance of described storage hopper dredger is connected with the outlet of described carbonizer, and described storage hopper dredger is made up of the lifting gear 6 be sequentially connected and feeding warehouse 7;

Described product recovery comprises the biological carbon recovery unit 13 and gas phase recovery unit that are connected with gas retort respectively; Described gas phase recovery unit comprises the decomposition of unit for treating water, wood vinegar and wood tar oil, purification process unit and organic gas processing unit;

Described organic gas processing unit comprise be linked in sequence successively fly-ash separator 9, organic substance decomposing purification unit 10, water cooler 11, combustion gas storage tank 12; Combustion gas storage tank 12 in described organic gas processing unit is also connected with mud distillation system with described drying sludge-carbonization system respectively through heating pipe line;

Described jacketed screw transfer roller 2 is also connected with flare system by exhaust pipeline; Described flare system comprises order successively and is connected dedusting except acid unit 14, plasma deodorization unit 15, induced draft fan 16, alkali cleaning spray unit 17, agent-feeding treatment unit and gas vent unit.

Embodiment 4

The device adopting embodiment 3 to provide carries out the method that embodiment 1 provides.

Embodiment 5

The device adopting embodiment 3 to provide carries out the method that embodiment 2 provides.

Although above the present invention is described in detail with a general description of the specific embodiments, on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, all belong to the scope of protection of present invention.

Claims (10)

1. a cleaning method for mud, is characterized in that, said method comprising the steps of:
(1) by after pending mud preheating, be no more than the enclosed space inner drying of 250 DEG C in temperature, make water ratio be down to 30 ~ 40%, then carbonize in the enclosed space that temperature is no more than 300 DEG C, make the water ratio of mud be down to less than 30%;
(2) get the mud after step (1) process, under the oxygen free condition of 550 ~ 700 DEG C, destructive distillation 10 ~ 80min, obtains solid phase residue and gas-phase product respectively; Described solid phase residue is reclaimed as biological carbon;
(3) step (2) gained gas-phase product is carried out cooling, being separated, obtain gas and mixing liquid respectively;
Described gas is carried out aftertreatment, is described drying, charing, destructive distillation energy supply as combustion gas;
Described mixing liquid is carried out water separating of oil; Gained aqueous phase qualified discharge after treatment; Gained oil phase, through separation, decomposition, purifying, obtains wood vinegar, wood tar oil and combustible gas.
2. method according to claim 1, is characterized in that, the water ratio of the described pending mud of step (1) is not less than 50%, and organic content is not less than 40%.
3. method according to claim 1 and 2, it is characterized in that, described step (1) is specially: after pending mud preheating, in the enclosed space of 200 ~ 250 DEG C, carry out indirect heat exchange with thermal oil, makes the water ratio of mud be down to 30 ~ 40%; In the enclosed space of 250 ~ 270 DEG C, carry out indirect heat exchange with thermal oil again, make the water ratio of mud be down to less than 30%.
4. method according to claim 3, is characterized in that, the temperature of described thermal oil is 220 ~ 240 DEG C.
5. the method according to Claims 1 to 4 any one, it is characterized in that, step (2) described destructive distillation is specially: getting the rear water ratio of step (1) process is the mud of 10 ~ 30%, under the oxygen free condition of 600 ~ 700 DEG C, destructive distillation 12 ~ 75min, obtains solid phase, gas-phase product respectively.
6. the method according to Claims 1 to 4 any one, it is characterized in that, described step (2) is specially: the mud that after getting step (1) process, water ratio is less than 10%, with 15% wood chip mix after suppress balling-up, under the oxygen free condition of 550 ~ 600 DEG C, destructive distillation 12 ~ 75min, obtains solid phase, gas-phase product respectively.
7. method according to claim 1, is characterized in that, described method also comprises: waste gas step (1) described drying and charing produced is described pending mud preheating as thermal source, then qualified discharge after treatment.
8. a cleaning device for mud, is characterized in that, described device comprises mud plenum system, drying sludge-carbonization system, mud distillation system and the product recovery that order is successively connected;
Described mud plenum system comprises the connected storage bin of order and jacketed screw transfer roller;
Described drying sludge-carbonization system comprises the connected low-temperature drier of order and carbonizer, and the entrance of described low-temperature drier is connected with the outlet of described jacketed screw transfer roller; Described low-temperature drier and carbonizer inside are equipped with thermal cycling crosspoint; Described low-temperature drier and carbonizer are also connected with described jacketed screw transfer roller respectively through preheating gas pipeline;
Described mud distillation system comprises the connected storage hopper dredger of order and gas retort; The entrance of described storage hopper dredger is connected with the outlet of described carbonizer;
Described product recovery comprises the biological carbon recovery unit and gas phase recovery unit that are connected with gas retort respectively; Described gas phase recovery unit comprises the decomposition of unit for treating water, wood vinegar and wood tar oil, purification process unit and organic gas processing unit; Described organic gas processing unit is also connected with mud distillation system with described drying sludge-carbonization system respectively through heating pipe line.
9. device according to claim 8, is characterized in that, described thermal cycling crosspoint comprises the twin shaft hollow blade and crustless sandwich that can fill thermal oil;
Described thermal cycling crosspoint is connected with heat-conducting oil furnace.
10. device according to claim 8 or claim 9, it is characterized in that, described jacketed screw transfer roller is also connected with flare system by exhaust pipeline;
Described flare system comprises order successively and is connected dedusting except acid unit, plasma deodorization unit, alkali cleaning spray unit, agent-feeding treatment unit and gas vent unit.
CN201510407727.6A 2015-07-13 2015-07-13 The cleaning method and device of a kind of sludge CN105038822B (en)

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CN107324941A (en) * 2017-06-12 2017-11-07 四川雷鸣环保装备有限公司 Municipal sludge charcoal base composite fertilizer and biological fuel gas joint production process
CN107162373A (en) * 2017-06-21 2017-09-15 福建禹环境科技有限公司 A kind of pig manure method of comprehensive utilization based on carbonization pyrolytic technique

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