CN106630526A - Sludge hydrothermal oxidization reaction system and method with function of product reflux pretreatment - Google Patents
Sludge hydrothermal oxidization reaction system and method with function of product reflux pretreatment Download PDFInfo
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- CN106630526A CN106630526A CN201710127067.5A CN201710127067A CN106630526A CN 106630526 A CN106630526 A CN 106630526A CN 201710127067 A CN201710127067 A CN 201710127067A CN 106630526 A CN106630526 A CN 106630526A
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- 239000010802 sludge Substances 0.000 title claims abstract description 248
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000010992 reflux Methods 0.000 title abstract description 4
- 239000000047 product Substances 0.000 claims abstract description 83
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000006243 chemical reaction Methods 0.000 claims abstract description 40
- 239000012263 liquid product Substances 0.000 claims abstract description 37
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 26
- 239000001301 oxygen Substances 0.000 claims abstract description 26
- 239000007791 liquid phase Substances 0.000 claims abstract description 13
- 238000003756 stirring Methods 0.000 claims abstract description 13
- 230000003647 oxidation Effects 0.000 claims abstract description 7
- 239000012071 phase Substances 0.000 claims description 56
- 230000001590 oxidative effect Effects 0.000 claims description 25
- 239000010865 sewage Substances 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 16
- 239000007790 solid phase Substances 0.000 claims description 13
- 239000010801 sewage sludge Substances 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 11
- 230000018044 dehydration Effects 0.000 claims description 10
- 238000006297 dehydration reaction Methods 0.000 claims description 10
- 239000005416 organic matter Substances 0.000 claims description 10
- 239000007800 oxidant agent Substances 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 9
- 238000006392 deoxygenation reaction Methods 0.000 claims description 8
- 239000012265 solid product Substances 0.000 claims description 8
- 238000007701 flash-distillation Methods 0.000 claims description 7
- 230000035484 reaction time Effects 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 17
- 238000011084 recovery Methods 0.000 abstract description 10
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 9
- 239000002918 waste heat Substances 0.000 abstract description 9
- 239000001569 carbon dioxide Substances 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 8
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 241000196324 Embryophyta Species 0.000 description 13
- 238000010438 heat treatment Methods 0.000 description 7
- 239000002956 ash Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000693 micelle Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003818 cinder Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000002309 gasification Methods 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000010954 inorganic particle Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 1
- 206010067171 Regurgitation Diseases 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000003834 intracellular effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 239000011146 organic particle Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000010025 steaming Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
- C02F11/08—Wet air oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/18—Treatment of sludge; Devices therefor by thermal conditioning
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge hydrothermal oxidization reaction system and method with a function of product reflux pretreatment, and belongs to the field of municipal sludge treatment. A gaseous product generated through hydrothermal oxidation is led out from the top of a reactor, residual oxygen and produced carbon dioxide after the reaction are removed, and then the gaseous product is introduced into a sludge pretreatment tank and directly contacted with sludge for preheating the sludge; a divided flow part of a liquid product flows back to the sludge pretreatment tank; steam and hot water preheat sludge under the stirring action, and the problem that heat recovered by the system is not enough to preheat the sludge to reach the feeding temperature is solved; the residual liquid product is treated with a vacuum flashing method, flash steam is recovered and sent to a pretreatment sludge feeding pipe for tracing heat, and meanwhile, a liquid phase after flash deoxidization enters a downstream heat-exchange device for waste heat recovery. With the adoption of measures, high-temperature material heat of the system can be recovered to preheat sludge, corrosion of dissolved oxygen to a heat exchanger can be relieved, system investment is reduced, and energy utilization rate and economic efficiency of the system are increased.
Description
Technical field
The invention belongs to municipal sludge process field, more particularly to the Treatment of Sludge that sewage treatment plant produces.
Background technology
Municipal sludge is a kind of flocculent substance of the solid-liquid mixing being made up of various microorganisms and organic and inorganic particle,
Urban sewage purification processing procedure is mostly come from, is the accessory substance of municipal sewage plant；Typical municipal wastewater treatment plant is basic
Technological process is as shown in Figure 1：Municipal sewage enters sewage treatment plant by sewerage system, through grid and setting pot it
Afterwards, the larger inorganic particle of suspension larger in sewage or floating thing and proportion (such as silt, cinder etc.) is removed；Then
Sewage enters preliminary sedimentation tank, in sewage it is contained can sedimental substance precipitate to form primary sludge；Sewage continues on through biology
Process enters second pond, and a portion sludge reflux is used to carry out a biological disposal upon, and remaining activated sludge and primary sludge are together
The mixing sludge of formation further produces mechanical dehydration sludge after concentration and dehydration.It is different according to sewage disposal link,
The physicochemical property of sludge is not quite similar produced by each link, by taking initial sludge and excess sludge as an example, the content of organic matter therein
It is as shown in table 1 below.
Organic matter composition content in the sludge of table 1
Moisture content of the sludge that sewage treatment plant produces Jing after mechanical dehydration further drops typically in 75%～85% scope
Low-water-content is difficult.Hydrothermal oxidation technology is a kind of new sludge disposal technology, in the water of certain temperature and pressure, oxygen
Organic oxidation in sludge is generated simple free of contamination carbon dioxide, lime-ash and water by agent；Sludge organic matter transformation is thorough
Bottom, without NOx、SO2Generate Deng dusty gas, heavy metal is in stable state, liquid product biochemical property is good.
Suspended particulate aggregation sedimentation in accelerate sewage, sewage disposal process addition flocculant.It is in glue that flocculant makes sludge
Bulk, most of moisture is wrapped up wherein, and mechanical dehydration can only remove surface water and Interstitial Water, account in the micelle of moisture 80% or so
The intracellular water of moisture and sludge of parcel is de- not to be fallen；The micelle characteristic of sludge itself, causes that its sewage sludge viscosity is big, poor fluidity,
The direct difficult feed of sludge hydrothermal oxidization system.
Raising sludge temperature ruptures can the membranous wall of parcel sludge water content, hydrolyze organic matter, discharge water therein, so as to
Reduce viscosity；Stirring makes sludge that shearing motion to occur, and pulls and smashes micelle, also functions to the effect of viscosity reduction；Therefore can adopt
The pretreatment of the mode such as preheating or stirring reduces sewage sludge viscosity.
Sludge preheating is directly heated and indirectly heat according to whether thermal source contacts to be divided into sludge.Direct-fired thermal source
Mostly steam or hot water；The thermal source of indirectly heat is steam or conduction oil.Preheating sludge institute's calorific requirement is from reacted high temperature
The waste heat of material recycle.Because viscosity is big, indirect heat exchange mode preheats sludge and easily causes that crushing is big, pipeline blockage；With it is indirect
Heating is compared, and direct-fired heat loss is little, not pipeline crushing and blockage problem, but the addition of steam or water, can make sludge
Moisture content improves.
During using directly heating preheating sludge, thermal source mostly is the flash steam of high-temperature material flash distillation generation；Flash steam is not enough to
Sludge is set to be preheating to the temperature required into before reactor, needs carry out again heating otherwise after the preheating of recovery waste heat,
The indirect heat exchange and Electromagnetic Heating of high-temperature material after such as reacting.Contain remaining dissolved oxygen after reaction in liquid phase material, adopt
The indirect recovery waste heat of heat exchanger will cause equipment corrosion, and in addition, heat exchanger, the input of electromagnetic heater equipment increased and be
System complexity and equipment investment.
In sum, in the patented technology announced at present, the system thermal for being primarily present sludge pretreatment recovery is not enough, anti-
Should after liquid product dissolved oxygen descend etching apparatus at high temperature, firing equipment need to be increased increase and invest and system complexity etc. is asked
Topic.
The content of the invention
It is an object of the invention to：The system thermal for solving the sludge pretreatment recovery that prior art is present is not enough, needs
Increasing firing equipment increases investment and system complexity, and liquid product dissolved oxygen descends at high temperature etching apparatus etc. after reacting
Problem.
The object of the invention is realized by following technical proposals：
A kind of sludge water thermal oxidative reaction system of pretreatment of backflowing with product, it is characterised in that：Including sludge pretreatment
Device, agitator, booster pump, hydrothermal oxidization reactor, gas phase deaerating plant, current divider and flash tank, sludge pretreatment device
Sludge feed(raw material)inlet, reactor gas-phase product entrance and reactor liquid product entrance, and pretreating sludge outlet are provided with,
It is provided with to stir what the sludge and reactor gas-phase product entrance of the entrance of sludge feed(raw material)inlet were entered in sludge pretreatment device
The reactor gas, liquid product of the carrying partial solid phase particle that reactor gas-phase product and reactor liquid product entrance are entered
Agitator, sludge pretreatment device sludge outlet pretreating sludge outlet and the sludge inlet of hydrothermal oxidization reactor between
Sludge carrier pipe road be provided with booster pump, hydrothermal oxidization reactor is provided with sludge inlet, oxidant inlet, gas-phase product and goes out
The outlet of mouth, slag-drip opening and liquid product, the gas-phase product outlet of hydrothermal oxidization reactor and the reactor of sludge pretreatment device
Gas-phase product entrance by being provided with the pipeline connection of gas phase deaerating plant, the liquid product outlet of hydrothermal oxidization reactor by point
Stream device is connected respectively with the reactor liquid product entrance of sludge pretreatment device and the sludge product inlet of flash tank, flash distillation
The sludge product exit of tank is connected with aftertreatment device.
Alternatively, indirectly and/or the device of its interior sludge raw material is directly heated without other on sludge pretreatment device.
Alternatively, between the pretreating sludge outlet of sludge pretreatment device and the sludge inlet of hydrothermal oxidization reactor
Sludge carrier pipe road on also without indirectly and/or directly heating the device of its interior sludge raw material.
Alternatively, between the pretreating sludge outlet of sludge pretreatment device and the sludge inlet of hydrothermal oxidization reactor
Sludge carrier pipe road on be additionally provided with double pipe heater, double pipe heater dodges to the sludge indirectly heat in sludge carrier pipe road
The flash distillation vapor outlet of steaming pot is connected with the steam inlet of double pipe heater.In the program, reclaim flash steam heat and sludge is conveyed
Process is incubated.
Alternatively, sludge pretreatment device includes the chuck that sludge pretreatment tank and its peripheral hardware are put, and chuck is provided with
Reactor gas-phase product entrance and reactor liquid product entrance, on sludge pretreatment tank top tank structure the steam passed in tank is provided with
Hole and liquid product hole, the reactor gas-phase product entrance on chuck is communicated with steam hole, the reactor liquid product on chuck
Entrance is communicated with liquid product hole.
Alternatively, the agitator in sludge pretreatment tank is carried to strike off the scraper for sticking the sludge on top tank structure.
Alternatively, follow-up sludge treatment equipment includes heat exchanger, feed pump and settling tank, and heat exchanger is provided with feed-water intake
With feedwater/steam (vapor) outlet, and sludge product inlet and sludge product exit, sludge product exit and the heat exchanger of flash tank
Sludge product inlet is connected, and feed pump is connected with the feed-water intake of heat exchanger, and sludge product exit and the settling tank of heat exchanger connect
It is logical.
A kind of sludge water thermal oxidative reaction method of pretreatment of backflowing with product, comprises the following steps successively：
1) by sewage treatment plant Jing after mechanical dehydration municipal sludge of the moisture content mass percent between 75%～85%
It is delivered in sludge pretreatment device；
2) in sludge pretreatment device, the reactor gas-phase product that backflows and the reactor liquid for carrying partial solid phase particle
Phase product directly heats under stirring sludge, and sludge temperature is increased to 100 DEG C～150 DEG C, moisture percentage in sewage sludge quality percentage
Than allotment to 90%～93%, sewage sludge viscosity is down to below 220mPa.s (minimum to be down to below 20mPa.s)；
3) the pressurized hydrothermal oxidization reactor that is delivered to of the pretreated sludge of sludge pretreatment device carries out hydrothermal oxidization
Reaction, oxidant ensures to maintain certain liquid level in 1～1.4 excess coefficient, reactor, more than free surface is gas-phase space；
Control temperature of reactor maintains 250 DEG C～300 DEG C, and pressure maintains 5～11MPa, sludge oxidation organic matter liberated heat
Just reaction temperature, reaction time is maintained to control in 15～60min；
4) gas-phase product that reaction is generated is drawn from hydrothermal oxidization reactor head gas-phase space, Jing after gas phase deaerating plant
Send into sludge pretreatment device；
Be scattered here and there solid phase particles in reacted liquid product, and solid phase bulky grain is deposited in reactor bottom, is set by bottom
The slag-drip opening periodic exhaustion put；Liquid phase is carry after solid phase little particle draws from below hydrothermal oxidization reactor free surface, Jing
Part flow arrangement backflows part to sludge pretreatment device, and the solid product stream of remaining liquid enters the adiabatic step-down of flash tank, after deoxygenation
The solid product of liquid enters follow-up sludge treatment equipment.
Alternatively, the sludge between the sludge inlet of the sludge outlet of sludge pretreatment device and hydrothermal oxidization reactor
Double pipe heater is additionally provided with transfer pipeline, double pipe heater is to the sludge indirectly heat in sludge carrier pipe road to remain dirty
Mud preheating temperature, the thermal source of double pipe heater is the flash steam from flash tank.
Alternatively, sludge preheating temperature is 120 DEG C～150 DEG C in sludge pretreatment device, and hydrothermal oxidization reactor is anti-
Temperature is answered for 250 DEG C, reaction time is 30～45min, oxygen makees oxidant, and oxygen excess coefficient is 1.1～1.2；Institute
It is 90%～93% to state the moisture percentage in sewage sludge mass percent under preheating temperature, reaction temperature.
Aforementioned main scheme of the invention and its each further selection scheme can be this with independent assortment to form multiple schemes
Invention can be adopted and claimed scheme；And the present invention, between (each non conflicting selection) is selected and and other selections between
Can also independent assortment.Those skilled in the art can understand have after the present invention program is understood according to prior art and common knowledge
Multiple combination, is claimed technical scheme of the invention, and here does not do exhaustion.
In the present invention program, the gas-phase product generated after sludge hydrothermal oxidization in hydrothermal oxidization reactor is by reactor head
Draw, after gas phase deaerating plant removes wherein unnecessary oxygen and the carbon dioxide for generating, be passed through sludge pretreatment device,
Liquid product shunting simultaneously is partly refluxed to sludge pretreatment device, and gas-phase product and liquid product are directly contacted with sludge simultaneously
Sludge is preheated, now steam and hot water preheat under stirring sludge, solve prior art systems and reclaim shortage of heat with pre-
The problem of hot sludge to feeding temperature --- the present invention only needs to the mode that preceding product backflows and is capable of achieving to the abundant of sludge
Preheating, can also obtain than existing without heating/preheating device extra in prior art, and the preheating method of the present invention
There is the higher preheating temperature of technology (may be up to 120 DEG C～150 DEG C), can larger reduce sewage sludge viscosity.
Meanwhile, during preheating sludge, steam and hot water can increase the moisture content of sludge (from 75%～85% increase
To 90%～93%), sludge will be preheated by the method and sludge concentration allotment will be organically combined, and, by increasing moisture content
Mode, hinge structure moisture content of the present invention is higher so that the content of organic matter is just in sludge in hydrothermal oxidization reactor
Oxidation reaction can be maintained to enter trip temperature and (moisture content is relatively low in prior art, needs extra heat absorption without the need for extra heat-absorbent surface
Heat controlling reaction temperature extra in the absorbing reaction of face), at the same moisture content it is higher can enhanced feed sludge in HTHP
Dispersion effect in water, shortens the time (can only need 30～45, or even 15min) that oxidation reaction is completed.
The side that the remaining liquid product for carrying ash fines solid impurity particle of hydrothermal oxidization reactor passes through flash tank vacuum flashing
Method, removes dissolved oxygen, mitigates the corrosion to downstream heat transmission equipment, so as to realize remaining high-temperature material heat recovery.
By above measure, it is capable of achieving recovery system high-temperature material heat preheating sludge, alleviates dissolved oxygen corrosion heat exchanger
The problems such as, system investments are reduced, improve system capacity utilization rate and economy.
Beneficial effects of the present invention：
(1) only sludge is preheated by reclaiming gas-phase product, Partial Liquid Phase product, you can ensure that system reclaims heat and meets dirty
The pre- heat demand of mud.
(2) viscosity reduction, good fluidity after hinge structure sludge pretreatment, the dispersion effect in HTHP liquid phase water
It is really good, shorten the oxidation reaction time of staying.
(3) solve prior art sludge the next equipment increase in further heating tape to be also needed to Jing after product preheating and is invested increase
Plus problem.
(4) deoxygenation by the way of vacuum flashing, it is ensured that the working environment of waste heat recovery apparatus.
(5) sludge produces poisonous and harmful substance after oxidation, not；Gas-phase product can be discharged directly, liquid phase biochemical property
Good, reflowable to sewage treatment plant, solid phase dehydration property and heavy metal is stable in properties good can be filled directly after dehydration.
Description of the drawings
Fig. 1 is municipal sewage plant's process chart；
Fig. 2 is the device schematic flow sheet of the embodiment of the present invention；
Wherein 1- sludge storage bins 2- screw pumps 3- sludge pretreatments tank 4- agitators 5- booster pump 6- double pipe heaters
7- reactor 8- gas phase deaerating plant 9- current divider 10- flash tank 11- heat exchanger 12- feed pump 13- settling tanks.
Specific embodiment
Following non-limiting examples are used to illustrate the present invention.
With reference to shown in Fig. 2, include with the sludge hydrothermal oxidization system that product backflows：Sludge pretreatment device (locate in advance by sludge
Reason tank 3), agitator 4, booster pump 5, hydrothermal oxidization reactor 7, gas phase deaerating plant 8, current divider 9 and flash tank 10, Yi Jihuan
Hot device 11, feed pump 12, settling tank 13 etc..Concrete scheme is as follows：
(1) sludge conveying：Using screw pump 2, by the sludge of moisture content mass percent about 80%, from 1 turn of sludge storage bin
Move to sludge pretreatment tank 3.
(2) sludge pretreatment：Agitator 4 and scraper are provided with sludge pretreatment tank 3, in stirring sludge shearing force is provided
Meanwhile, strike off the sludge sticked on top tank structure；Gas-phase product and carry partial solid phase that the reaction of hydrothermal oxidization reactor 7 is generated
The Partial Liquid Phase product reflux of grain to sludge pretreatment tank 3, reinforcement sludge pre-heat effect under stirring, viscosity reduction, allotment are dirty
Mud moisture content；Pretreated moisture percentage in sewage sludge is improved to more than 90%.Sludge pretreatment tank 3 is externally provided with chuck, has on chuck
Reactor gas-phase product entrance (steam inlet) and reactor liquid product entrance (hot water inlet)；Sludge pretreatment tank top tank structure
On be provided with steam hole, be passed through the steam Jing steam holes of chuck into inside sludge；Liquid is symmetrically provided with sludge pretreatment top tank structure
Phase product hole (hot water hole), the liquid product that backflows is entered inside sludge by hot water hole；
(3) sludge pressurized delivered：Pretreated sludge sends into hydrothermal oxidization reactor 7 by high-pressure pump pressurization.
(4) hydrothermal oxidization reaction：Preheated sludge is sent into after hydrothermal oxidization reactor 7, with the oxidant such as oxygen in height
There is hydrothermal oxidization reaction in warm water under high pressure, reaction temperature is 250～300 DEG C, reaction pressure in 5～11MPa, generate gas,
The products such as water, lime-ash and release reaction heat maintenance reaction temperature.
(5) gas-phase product is except oxygen and carbon dioxide：It is vapor, dioxy that gas-phase product after oxidation reaction is mainly constituted
Change carbon and oxygen more than needed, gas-phase product, will wherein by basic anhydride and sponge iron such as quick limes in gas phase deaerating plant 8
Carbon dioxide and oxygen separate, remove the steam after oxygen and carbon dioxide and send into the reactor gas of sludge pretreatment tank 3
Phase product inlet (steam inlet).
(6) liquid product backflow：After oxidation reaction, bulky grain is deposited on the bottom of reactor 7 in liquid phase, periodically from reactor
7 bottom slag discharges are discharged；Tiny lime-ash is partly returned with liquid product through current divider 9 (such as distributing T-pipe device) in liquid phase
It flow to reactor liquid product entrance (hot water inlet) of sludge pretreatment tank 3.
(7) flash distillation deoxygenation：Liquid product does not backflow part flash distillation deoxygenation after the decompression of flash tank 10, dissolves oxygen therein
Gas gasification is discharged, and is separated with the solid product of liquid；The flash steam of flash tank 10 backflows and sludge preheating temperature is maintained to double pipe heater 6
Degree.
(8) product waste heat recovery：Product waste heat Jing heat exchangers 11 after deoxygenation are reclaimed with the feedwater heat exchange of feed pump 12, are produced
Hot water or steam.
(9) product solid-liquor separation：The solid product of liquid flows into settling tank 13, and supernatant can return to sewage treatment plant；Oxidized place
Particle dehydration performance after reason is good, is dehydrated using plant machineries such as filter presses, dewatered cake moisture content<50%, can directly fill out
Bury.
A kind of sludge water thermal oxidative reaction method of the pretreatment of backflowing with product of employing aforementioned system, specifically includes：
Sewage treatment plant sludge (solid content mass percent is between 15%～25%), Jing screw pumps Jing after mechanical dehydration
2 are transferred in sludge pretreatment tank 3.
In sludge pretreatment tank 3, the gas-phase product and Partial Liquid Phase product that hydrothermal oxidization reactor 7 backflows is made in stirring
Sludge is directly heated with；Sludge temperature is increased to 100 DEG C～150 DEG C, preferably 120 DEG C～150 DEG C, moisture percentage in sewage sludge quality
Percentage is allocated to 90%～93%, and sewage sludge viscosity is down to below 220mPa.s (minimum to be down to below 20mPa.s), and sludge is defeated
Resistance is sent to reduce.
Sludge Jing booster pumps 5 are delivered to hydrothermal oxidization reactor 7, sludge pressurized delivered pipe peripheral hardware double pipe heater 6, flash distillation
The flash steam of tank 10 backflows and sludge preheating temperature is maintained to double pipe heater 6.
Oxygen makees oxidant in hydrothermal oxidization reactor 7, and pressurized device enters reactor；Oxygen ensures certain excess
Coefficient, oxygen excess coefficient is 1～1.4, preferably 1.1～1.2；Certain liquid level, free liquid are maintained in hydrothermal oxidization reactor 7
More than face it is gas-phase space；Control temperature of reactor maintains 250 DEG C～300 DEG C, preferably 250 DEG C, and pressure maintains 5～
11MPa；Temperature, the selection of pressure are relevant with sludge allotment concentration, and sludge oxidation organic matter liberated heat maintains reaction just
Temperature；Reaction time is controlled in 15～60min, preferably 30～45min.
The gas-phase product autoreactor top gas phase space that reaction is generated is drawn, and Jing after gas phase deaerating plant 8 sludge is sent into
In pretreatment tank 3, in gas-phase product after carbon dioxide preheating sludge, directly discharge.
Be scattered here and there solid phase particles in reacted liquid product, after drawing below autoreactor free surface, Jing current dividers 9
Backflow to pretreatment tank, sludge concentration of the regurgitation volume needed for reaction condition is determined；Can addition in the liquid product that backflows
The chemical reagent such as credit powder, stabilizer, oxidant, improve the viscosity reducing effect in pretreatment tank, shorten pretreatment time.It is remaining
The solid product stream of liquid enter the adiabatic step-down of flash tank 10, part is water, is dissolved in the gases such as oxygen therein and carbon dioxide
Separate out；Flash steam backflows to double pipe heater 6, and the solid product of the liquid after deoxygenation enters heat exchanger, recovery waste heat.
Reacted bulky grain ash deposition arranges row in the bottom of hydrothermal oxidization reactor 7, the bottom of hydrothermal oxidization reactor 7
The regular deslagging of cinder notch.
Using example：
With the dirty mud as a raw material of moisture content about 80%, with pure oxygen as oxidant, enter in the reactor with free surface
Row sludge water thermal oxidative reaction.The Industrial Analysis and elementary analysis of sludge the results are shown in Table 2：
Certain the sludge of sewage treatment plant Industrial Analysis of table 2 and elementary analysis result
In table, Industrial Analysis is mass percentage concentration, and M is moisture, and A is content of ashes, and V is volatile matter content, FC
For fixed carbon content.
Mud handling capacity is 1t/h, and it is 1.2 to cross oxygen quotient.Sludge (20 DEG C, 1MPa, 1000kg/h, moisture content quality percentage
Number 82.21%) it is transferred in sludge pretreatment tank by sludge storage bin Jing screw pumps, set paddle, tank body peripheral hardware in pretreatment tank
There is chuck, perforate around tank body；Steam and hot water are passed through chuck, pre- in aperture enters sludge by chuck while stirring
Heat, the sludge temperature after preheating reach 150 DEG C, moisture content reach 92.8%, in shear rate 35s-1Under conditions of apparent viscosity
It is reduced to below 100mPa.s, good fluidity.Sludge 2492kg/h after preheating is delivered to reactor, and oxygen is reacted in reactor
From liquid-oxygen plant, it is stored in the liquid oxygen in liquid oxygen groove and sends into reactor, in height Jing liquid oxygen pump pressurization, Jing after vaporizer gasification
With organic qualitative response in sludge in warm water under high pressure.
Reaction temperature maintain 250 DEG C, reaction pressure 5MPa, the half an hour time of staying；Incomplete in view of organic matter
On the premise of reaction and reactor radiation loss, the content of organic matter can maintain reaction temperature in sludge when entering reactor.Reaction life
Into gas-phase product free surface headroom assemble, in order to maintain reactor pressure stablize, gas-phase product is continuous
Extract out from reactor head；Mole composition 79%H of gas-phase product2O+5%O2+ 1%N2+ 15%CO2；Gas-phase product (250 DEG C,
5MPa, 595kg/h) deliver to the steam inlet for pre-processing tank chuck.Remaining O is dissolved with the solid product of liquid2With the CO for generating2, from
Out afterwards through part flow arrangement, the product stream for controlling mass flow 1130kg/h backflows to sludge pretreatment tank chuck reactor
Hot water inlet, another part 980kg/h enters vacuum flashing deaerating plant, and the pressure of about 4MPa is sacrificed under adiabatic conditions, will
Solution gas is discharged, the flash steam (97.5% vapor+2.44%CO of generation2+10-4Oxygen, 179 DEG C, 1MPa, 222kg/h)
It is back in the sleeve pipe outside sludge pressurized delivered pipe, the temperature for maintaining preheating sludge is not less than 150 DEG C.Material after deoxygenation passes through
Heat exchanger, cooled water is absorbed after being cooled to about 60 DEG C after waste heat, is discharged into settling tank；Saturated vapor is produced into cooling water heat absorption.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of sludge water thermal oxidative reaction system of pretreatment of backflowing with product, it is characterised in that：Including sludge pretreatment dress
Put, agitator, booster pump, hydrothermal oxidization reactor, gas phase deaerating plant, current divider and flash tank, on sludge pretreatment device
Sludge feed(raw material)inlet, reactor gas-phase product entrance and reactor liquid product entrance, and pretreating sludge outlet are provided with, it is dirty
It is provided with to stir that the sludge and reactor gas-phase product entrance of the entrance of sludge feed(raw material)inlet enters is anti-in mud pretreatment unit
Answer the stirring of the reactor liquid product of the carrying partial solid phase particle of device gas-phase product and the entrance of reactor liquid product entrance
Device, the sludge carrier pipe road between the pretreating sludge outlet of sludge pretreatment device and the sludge inlet of hydrothermal oxidization reactor
Booster pump is provided with, hydrothermal oxidization reactor is provided with sludge inlet, oxidant inlet, gas-phase product outlet, slag-drip opening and liquid
Phase product exit, gas-phase product outlet and the reactor gas-phase product entrance of sludge pretreatment device of hydrothermal oxidization reactor lead to
The pipeline connection for being provided with gas phase deaerating plant is crossed, the liquid product outlet of hydrothermal oxidization reactor passes through current divider respectively and sludge
The reactor liquid product entrance of pretreatment unit and the sludge product inlet connection of flash tank, the sludge product of flash tank goes out
Mouth is connected with aftertreatment device.
2. backflow with product as claimed in claim 1 the sludge water thermal oxidative reaction system of pretreatment, it is characterised in that：Sludge
Indirectly and/or the device of its interior sludge raw material is directly heated on pretreatment unit without other.
3. backflow with product as claimed in claim 1 the sludge water thermal oxidative reaction system of pretreatment, it is characterised in that：Sludge
Do not have on sludge carrier pipe road between the pretreating sludge outlet of pretreatment unit and the sludge inlet of hydrothermal oxidization reactor yet
There is indirectly and/or directly heats the device of its interior sludge raw material.
4. backflow with product as claimed in claim 1 the sludge water thermal oxidative reaction system of pretreatment, it is characterised in that：Sludge
Also set on sludge carrier pipe road between the pretreating sludge outlet of pretreatment unit and the sludge inlet of hydrothermal oxidization reactor
There is double pipe heater, double pipe heater is to the sludge indirectly heat in sludge carrier pipe road, flash distillation vapor outlet and the set of flash tank
The steam inlet connection of pipe heater.
5. backflow with product as claimed in claim 1 the sludge water thermal oxidative reaction system of pretreatment, it is characterised in that：Sludge
Pretreatment unit includes the chuck put of sludge pretreatment tank and its peripheral hardware, and chuck is provided with reactor gas-phase product entrance and anti-
Device liquid product entrance is answered, the steam hole and liquid product hole passed in tank is provided with sludge pretreatment tank top tank structure, on chuck
Reactor gas-phase product entrance communicate with steam hole, the reactor liquid product entrance on chuck is communicated with liquid product hole.
6. backflow with product as claimed in claim 1 the sludge water thermal oxidative reaction system of pretreatment, it is characterised in that：Sludge
Agitator in pretreatment tank is carried to strike off the scraper for sticking the sludge on top tank structure.
7. backflow with product as claimed in claim 1 the sludge water thermal oxidative reaction system of pretreatment, it is characterised in that：Subsequently
Processing meanss include heat exchanger, feed pump and settling tank, and heat exchanger is provided with feed-water intake and feedwater/steam (vapor) outlet, and sludge
Product inlet and sludge product exit, the sludge product exit of flash tank is connected with the sludge product inlet of heat exchanger, feed pump
Connect with the feed-water intake of heat exchanger, the sludge product exit of heat exchanger is connected with settling tank.
8. a kind of sludge water thermal oxidative reaction method of pretreatment of backflowing with product, it is characterised in that comprise the following steps successively：
1) municipal sludge conveying of the moisture content mass percent between 75%～85% Jing after mechanical dehydration by sewage treatment plant
To sludge pretreatment device；
2) in sludge pretreatment device, the reactor gas-phase product for backflowing and the reactor liquid phase for carrying partial solid phase particle are produced
Thing directly heats under stirring sludge, and sludge temperature is increased to 100 DEG C～150 DEG C, and moisture percentage in sewage sludge mass percent is adjusted
90%～93% is assigned to, sewage sludge viscosity is down to below 220mPa.s；
3) the pressurized hydrothermal oxidization reactor that is delivered to of the pretreated sludge of sludge pretreatment device carries out hydrothermal oxidization reaction,
Oxidant ensures to maintain certain liquid level in 1～1.4 excess coefficient, reactor, more than free surface is gas-phase space；Control is anti-
Device temperature is answered to maintain 250 DEG C～300 DEG C, pressure maintains 5～11MPa, and sludge oxidation organic matter liberated heat is tieed up just
Reaction temperature is held, reaction time is controlled in 15～60min；
4) gas-phase product that reaction is generated is drawn from hydrothermal oxidization reactor head gas-phase space, is sent into Jing after gas phase deaerating plant
In sludge pretreatment device；
Be scattered here and there solid phase particles in reacted liquid product, and solid phase bulky grain is deposited in reactor bottom, is arranged by bottom
Slag-drip opening periodic exhaustion；Liquid phase is carry after solid phase little particle draws from below hydrothermal oxidization reactor free surface, Jing shuntings
Device backflows part to sludge pretreatment device, and the solid product stream of remaining liquid enters the adiabatic step-down of flash tank, and the liquid after deoxygenation is consolidated
Product enters aftertreatment device.
9. backflow with product as claimed in claim 8 the sludge water thermal oxidative reaction method of pretreatment, it is characterised in that：Sludge
Also set on sludge carrier pipe road between the pretreating sludge outlet of pretreatment unit and the sludge inlet of hydrothermal oxidization reactor
There is double pipe heater, double pipe heater, to maintain sludge preheating temperature, covers to the sludge indirectly heat in sludge carrier pipe road
The thermal source of pipe heater is the flash steam from flash tank.
10. backflow with product as claimed in claim 8 the sludge water thermal oxidative reaction method of pretreatment, it is characterised in that：It is dirty
Sludge preheating temperature is 120 DEG C～150 DEG C in mud pretreatment unit, and hydrothermal oxidization reactor reaction temperature is 250 DEG C, and reaction stops
The time is stayed to be 30～45min, oxygen makees oxidant, and oxygen excess coefficient is 1.1～1.2；Under the preheating temperature, reaction temperature
Moisture percentage in sewage sludge mass percent be 90%～93%.
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| CN108996887A (en) * | 2018-08-31 | 2018-12-14 | 四川深蓝环保科技有限公司 | A kind of thickened sludge hydro-thermal treatment method and system |
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