CN109399893A - A kind of the exhaust heat stepped of supercritical water oxidation Treatment of Sludge utilizes system and method - Google Patents
A kind of the exhaust heat stepped of supercritical water oxidation Treatment of Sludge utilizes system and method Download PDFInfo
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- 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
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- 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
- C02F11/086—Wet air oxidation in the supercritical state
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- 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
- C02F2303/10—Energy recovery
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Abstract
Exhaust heat stepped the invention discloses a kind of supercritical water oxidation Treatment of Sludge utilizes system and method, belongs to chemical industry and environmental technology field.Make sludge heating pyrohydrolysis by pyrohydrolysis reactor, first order pre-heating temperature elevation is carried out to sludge by sludge preheating can, using supercritical Water Oxidation Technology as core, sludge becomes high-temperature hot fluid after SCWO exothermic heat of reaction, pass sequentially through high-temperature preheater, reboiler, pyrohydrolysis reactor, sludge preheating can carries out high temperature section to material and is preheated to super critical condition, deamination fluid is boiled, which again, by reboiler generates steam for subsequent ammonia still process, it is recycled by waste heat of the utilizing waste heat for refrigeration heating unit to high-pressure fluid, after passing through decompression separative unit, NH_3-N treating further is carried out to fluid into deamination unit, it is recycled finally by waste heat of the waste heat heating unit to low-pressure fluid, to realize the efficient utilization of sewage sludge harmlessness processing and system capacity, significantly reduce operating cost, increase systematic economy Property.
Description
Technical field
The invention belongs to chemical industry and environmental technology fields, and in particular to a kind of waste heat ladder of supercritical water oxidation Treatment of Sludge
Grade utilizes system and method.
Background technique
With the fast development of China's urban population quantity and urbanization process, municipal sewage yield is continuously increased, sewage
Number, processing capacity and the sludge yield for the treatment of plant also increase as.10,000 tons of sewage of every processing averagely generate 2.6 ton 80%
The wet mud of moisture content, sludge yield has broken through 40,000,000 tons within 2016.It can be seen that municipal sludge yield rises year by year, speedup is bright
It is aobvious.But the harmless rate of municipal sludge does not reach the specific resistance to filtration rate of the 80% of planning still less than 25%.To the north of
For the city of capital, by 2015, Beijing's sewage sludge harmlessness handling rate was also only 23% or so.And 2020 are planned for according to current
Year, the sewage sludge harmlessness processing disposition rate in ground level and the above city need to reach 90% or more.Therefore, the harmless processing of municipal sludge
Target is high.
Mud organic substance complicated component typically contains carbohydrate 14%, protein 40% or so, 10% left side of lipid
The right side, lignin 17% or so, content of ashes 30%~50%.Sludge butt content of organics is up to 50%~85%, and calorific value exists
5~18MJ/kg has resource utilization potentiality.On the other hand since the higher content of organics of sludge and nitrogen, phosphorus, potassium etc. are sought
It forms point, while also containing heavy metal element in ash content, therefore to realize harmless treatment, difficulty is higher.
Supercritical water (supercritical water, SCW) refers to that temperature, pressure are above its critical point (Tc=374
DEG C, Pc=22.1MPa) special state under water.Supercritical water has both the property of liquid and vaporous water, can be with organic matter and oxygen
Gas dissolves each other, and diffusion coefficient with higher and lower viscosity.Supercritical Water Oxidation Technology (Supercritical Water
Oxidation, abbreviation SCWO) it is to utilize water possessed special nature in the supercritical state, so that organic matter and oxidant is existed
Homogeneous oxidizing occurs in SCW rapidly and reacts next thorough decomposing organic matter, generates H2O and CO2Process, with traditional sludge handle skill
Art is compared, and SCWO has the advantage that
(1) oxidation efficiency is high, and the reaction time is short: for many organic matters difficult to degrade, within the very short residence time just
It can achieve 99% or more removal rate；
(2) self-heating easy to accomplish: when organic concentration is greater than 3%, self-heating is may be implemented in system；
(3) reaction compartment is closed, without secondary pollution: organic matter can be H with exhaustive oxidation2O and CO2Equal small-molecule substances.
Supercritical Water Oxidation Technology is at home and abroad applied, but when using the technical treatment sludge, needs to examine
Consider following problems: since supercritical water oxidation condition requires height, needing amount of heat to carry out heat temperature raising to material, simultaneously
Due to the high organic content of sludge, calorific value is high, if therefore can rationally utilize the reaction heat of system, optimize recycling scheme,
The energy consumption and thermal loss that can be substantially reduced in system operation improve system to reduce the operating cost of system
Economy facilitates the popularization and application of supercritical Water Oxidation Technology.The viscosity of 80% water content sludge is typically larger than
10000mPas, poor fluidity are unfavorable for pipeline.Therefore it needs that just there is certain flowing to after sludge dilution and homogeneous
Property, it then still needs to carry out sludge pyrohydrolysis processing, sewage sludge viscosity is made to be reduced to 6000mPas or less to meet system to object
The conveying requirement of material.Nitrogen content is higher (2~9wt%) in sludge, and mainly exists with protein form, in lower SCWO
Nitrogen is mainly broken down into ammonia nitrogen under reaction condition and nitrate nitrogen enters liquid product, to realize the place up to standard to nitrogen
Reason is then needed in higher coefficient of oxidation (3~10 times), higher reaction condition (600~700 DEG C, 27~29MPa), longer
Reaction time (100~150s) under carry out, this needs high cost to be just able to achieve, the warp of SCWO technical treatment sludge
Ji property will have a greatly reduced quality, it is therefore desirable to introduce traditional deamination apparatus and carry out subsequent processing to SCWO reaction water outlet, therefore need to introduce
A large amount of steam are evaporated deamination to the material of required processing.
And the heat recovery about supercritical water oxidation system has some relevant reports, but lacks there is also many
Point: current supercritical water oxidation system, the method for heat recovery are mainly the height after material reacts in the reactor
Heat is directly passed to material or intermediate heat transferring medium by a simple heat exchanger by warm product, to reach the benefit of heat
With.Although the utilization that this method carries out the exothermic heat of reaction amount during supercritical water oxidation, and do not meet heat
The standard of cascade utilization.The cascade utilization of heat includes consuming energy according to its quality and repeatedly utilizes two aspects step by step.Consuming energy according to its quality is exactly
High quality energy source is not set to do the achievable work of the low-quality energy as far as possible；When having to high temperature heat source to heat, also to the greatest extent may be used
It can be reduced heat transfer temperature difference；In only high temperature heat source, and only needing under the occasion of low-temperature heat, then Ying Xianyong high temperature heat source generates electricity,
Recycle the low temperature exhaust heat heating of power generator, such as cogeneration of heat and power.Step by step repeatedly using be exactly high quality energy source energy not necessarily
It to be exhausted in an equipment or in the process, because the temperature of the energy is to be gradually reduced during using high quality energy source
(can matter decline), and every kind of equipment always has a most economical reasonable use temperature range when consuming the energy.In this way,
When other than high quality energy source being reduced to economic and practical range in one apparatus, can go to another can be economical using this
It is gone in device compared with low energy matter using making total energy utilization rate reach highest level.The cascade utilization of heat can be improved whole
The heating efficiency of a system is energy-efficient important measures.
Currently, a kind of specifically for the system for preheating cascade utilization of supercritical water oxidation Treatment of Sludge and side not yet
Method.
Summary of the invention
In order to rationally utilize system thermal energy, optimization system UTILIZATION OF VESIDUAL HEAT IN scheme, it is super that the purpose of the present invention is to provide one kind
The exhaust heat stepped of critical oxidized sludge processing utilizes system and method, the present invention can processing sludge up to standard and carry out it is efficient,
The UTILIZATION OF VESIDUAL HEAT IN and recycling of step reduce system energy consumption and operating cost, improve system economy, realize sewage sludge harmlessness and money
Sourceization processing.
A kind of the exhaust heat stepped of supercritical water oxidation Treatment of Sludge disclosed by the invention utilizes system, including sludge pretreatment
Unit, supercritical water oxidation unit, post-reaction treatment unit, UTILIZATION OF VESIDUAL HEAT IN unit；
The sludge pretreatment unit includes sludge preheating can, homogenizing emulsifying pump, pyrohydrolysis reactor, sludge preheating can object
Material side outlet is connected with emulsifying pump intake, and emulsifying pump discharge is connected with pyrohydrolysis reactor material side entrance；
The supercritical water oxidation unit includes high-pressure frequency-conversion plunger pump, high-temperature preheater, heater and reactor, high pressure
Frequency conversion plunger pump intake is connected with pyrohydrolysis reactor material side outlet, high-pressure frequency-conversion outlet of plunger pump and high-temperature preheater material
Side entrance is connected, and the material side outlet of high-temperature preheater is connected with the entrance of heater, the outlet of heater and reactor inlet
It is connected, reactor inlet is also connected with the equipment for oxidant；
The post-reaction treatment unit includes decompression separative unit, reboiler, deamination unit, the UTILIZATION OF VESIDUAL HEAT IN unit packet
Include utilizing waste heat for refrigeration heating unit, waste heat heating unit；
Reactor outlet is connected with high-temperature preheater hot fluid side entrance, high-temperature preheater hot fluid side outlet and reboiler
Hot fluid side entrance is connected, and reboiler hot fluid side outlet is connected with hot fluid side entrance in pyrohydrolysis reactor, and pyrohydrolysis is anti-
Hot fluid side outlet in device is answered to be connected with sludge preheating can hot fluid side entrance, sludge preheating can hot fluid side outlet and waste heat system
Cold heating unit entrance is connected, and the outlet of utilizing waste heat for refrigeration heating unit is connected with decompression separative unit entrance, and decompression separative unit goes out
Mouth is connected with deamination supplies of unit side entrance；
The deamination supplies of unit side outlet is divided into two-way, is connected all the way with waste heat heating unit entrance, another way with again
Implements material side entrance is boiled to be connected；
The reboiler material side outlet is connected with deamination unit steam side entrance.
Further, heat exchanger and blender are equipped in the sludge preheating can.
Further, heat exchanger and blender are equipped in the pyrohydrolysis reactor.
Further, heat exchanger form is coil or water-jacket, and agitator type is paddle agitator, turbine type
Blender, anchor agitator or helix(ribbon type) agitator.
Further, the high-temperature preheater form is double pipe heat exchanger.
Further, the heater form is electromagnetic heater, infrared heater or resistance heater.
Further, the reactor types are tubular reactor or tank reactor.
Further, the reboiler form be thermosyphon reboiler, forced cyclic type reboiler or kettle type reboiler,
Internal heat form of tubes is shell and tube or spiral coil.
Exhaust heat stepped the invention also discloses a kind of supercritical water oxidation Treatment of Sludge utilizes method, is based on above-mentioned waste heat
Gradient utilization system, comprising the following steps:
1) sludge enters progress first order pre-heating temperature elevation in sludge preheating can, until partial size is small after homogenizing emulsifying pump is ground
Sludge after default value, grinding enters pyrohydrolysis reactor and carries out pre-heating temperature elevation, makes sludge that pyrohydrolysis reaction occur, glues
Degree is decreased to default value；
2) step 1) treated sludge is squeezed into high-temperature preheater through high-pressure frequency-conversion plunger pump, then flows through heater
Enter in reactor afterwards；
3) oxidant occurs with the organic matter in the sludge that handles through step 2) at supercritical conditions in the reactor
Phase reaction, organic matter are oxidized to CO2、N2And H2O, the high temperature fluid after reaction enter high-temperature preheater, enter high temperature with subsequent
Heat exchange occurs for the sludge of preheater, preheats to the sludge of subsequent entrance；
4) fluid after step 3) heat exchange cooling enters in reboiler, enters in pyrohydrolysis reactor heat to sludge afterwards
Heating brings it about pyrohydrolysis reaction, first order preheating is carried out to sludge into sludge preheating can, subsequently into utilizing waste heat for refrigeration system
Hot cell carries out waste heat recycling, makes fluid temperature reduction to the set temperature for being depressured separative unit；
5) fluid through step 4) enters decompression separative unit and carries out decompression separation, and treated fluid enters subsequent deamination
Unit；
6) fluid a part through step 5) deamination enter waste heat heating unit carry out heat recovery, another part into
Enter in reboiler, steam is generated by the subsequent hot fluid heats evaporation from high-temperature preheater, steam enters deamination unit to warp
Fluid after decompression separative unit decompression separation is evaporated deamination, and the hot fluid for being simultaneously from high-temperature preheater will cool down,
Subsequently into hydrolysis reactor, it is again introduced into deamination unit according to path described in step 4) and step 5) later, starts to follow
Ring.
Compared with prior art, the invention has the following beneficial technical effects:
The exhaust heat stepped of supercritical water oxidation Treatment of Sludge disclosed by the invention utilizes system, including sludge pretreatment list
Member, supercritical water oxidation unit, post-reaction treatment unit, UTILIZATION OF VESIDUAL HEAT IN unit；Sludge is passed through homogeneous by sludge pretreatment unit
Emulsification pump carries out after being ground to setting partial size, is successively heated up step by step by sludge preheating can, pyrohydrolysis reactor, viscosity reduction
Afterwards, it is transported in high-temperature preheater and preheats after being pressurizeed using high-pressure frequency-conversion plunger pump, and mixed with oxidant, in overcritical water oxygen
Change in the reactor in unit and supercritical water oxidation occurs；After reaction with sludge, the reboiler in high-temperature preheater
Sludge in interior deamination fluid, pyrohydrolysis reactor and sludge preheating can successively carries out heat exchange；Subsequently into waste heat system
The waste heat recycling of high pressure higher temperatures fluid is used for cooling and warming by cold heating unit, uses the decompression in post-reaction treatment unit point
Decompression separation is carried out to the fluid for being reduced to system set point temperature from unit, subsequently enters the processing that deamination unit carries out ammonia nitrogen,
Waste heat recycling into waste heat heating unit by low pressure compared with cryogen is used to heat, the final near-zero release for realizing sludge, most
Realize to bigization the cascade utilization of sludge supercritical water oxidation heat.
Further, heat exchanger and blender are set in sludge preheating can and pyrohydrolysis reactor, it can be with by heat exchanger
Heat exchange is carried out with generated high temperature fluid after progress supercritical water oxidation in reactor, carrys out the high-temperature stream of autoreactor
Body carries out classification pre-heating temperature elevation to the sludge in sludge preheating can and pyrohydrolysis reactor.Made in sludge preheating can by blender
Sludge it is preferably heated, make the sludge in pyrohydrolysis reactor that pyrohydrolysis reaction occur more quickly, reduce viscosity.
Further, high-temperature preheater, reactor, heater and reboiler diversification of forms are asked in any components
When topic, more, the Yi Genghuan of alternative of staff.
It is disclosed by the invention based on the exhaust heat stepped processing method using system, it is innovative to sludge supercritical water oxidation
Treated, and reaction heat has carried out cascade utilization.Classification preheating is carried out to sludge using sludge preheating can and pyrohydrolysis reactor to rise
Temperature, to reach the viscosity reduction that pyrohydrolysis reaction temperature condition realizes sludge；Homogeneous sludge is preheated using high-temperature preheater
Heating, makes material reach supercritical reaction temperature condition；In the reactor by the sludge of SCWO processing, the high-temperature stream after reaction
Body enters post-reaction treatment unit and UTILIZATION OF VESIDUAL HEAT IN unit, using UTILIZATION OF VESIDUAL HEAT IN unit to high-pressure fluid, low-pressure fluid after reaction
It carries out waste heat recycling and is respectively used to cooling and warming and heating；Fluid is depressured using decompression separative unit and is separated, to separating
Solid residue stabilized, innoxious landfill, the gas separated put to idle discharge；Using deamination unit to super
Water outlet after critical oxidation processes carries out NH_3-N treating, while being recycled to deamination fluid, realizes resource utilization；
The high temperature fluid for carrying out autoreactor can successively pass through high-temperature preheater, reboiler, pyrohydrolysis reactor, sludge preheating can, to rear
The continuous sludge entered heats up, and carries out heat exchange with the deamination fluid for entering reboiler, makes deamination fluid again by reboiler
Boiling generates steam and is used for subsequent ammonia still process, and deamination is persistently evaporated in realization.The supercritical water oxidation Treatment of Sludge that this energy multi-level utilizes
Method can fully achieve the near-zero release of industrial treatment sludge and the efficient utilization of system waste heat.
Detailed description of the invention
Fig. 1 is the exhaust heat stepped structural schematic diagram using system of supercritical water oxidation Treatment of Sludge of the present invention.
Wherein, 1 is sludge preheating can；2 be homogenizing emulsifying pump；3 be pyrohydrolysis reactor；4 be high-pressure frequency-conversion plunger pump；5
For high-temperature preheater；6 be heater；7 be reactor；8 be utilizing waste heat for refrigeration heating unit；9 be decompression separative unit；10 be de-
Ammonia unit；11 be reboiler；12 be waste heat heating unit.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and
It is not to limit.
Referring to Fig. 1, the supercritical water oxidation sludge treating system that a kind of energy multi-level of the invention utilizes, whole system packet
Include sludge pretreatment unit, supercritical water oxidation unit, post-reaction treatment unit, UTILIZATION OF VESIDUAL HEAT IN unit.
The sludge pretreatment unit includes sludge preheating can 1, homogenizing emulsifying pump 2, pyrohydrolysis reactor 3, sludge preheating
1 material side outlet of tank is connected with 2 entrance of homogenizing emulsifying pump, the outlet of homogenizing emulsifying pump 2 and 3 material side entrance phase of pyrohydrolysis reactor
Even；It is equipped with heat exchanger and blender in sludge preheating can 1, pyrohydrolysis reactor 3, facilitates subsequent exchange heat.Sludge into
Enter progress first order pre-heating temperature elevation in sludge preheating can 1, until partial size is less than default value after the grinding of homogenizing emulsifying pump 2,
Sludge after grinding enters pyrohydrolysis reactor 3 and carries out second level pre-heating temperature elevation, makes sludge that pyrohydrolysis reaction occur, and viscosity reduces
To default value.
The supercritical water oxidation unit includes high-pressure frequency-conversion plunger pump 4, high-temperature preheater 5, heater 6 and reactor
7,4 entrance of high-pressure frequency-conversion plunger pump is connected with 3 material side outlet of pyrohydrolysis reactor, the outlet of high-pressure frequency-conversion plunger pump 4 and high temperature
5 material side entrance of preheater is connected, and the material side outlet of high-temperature preheater 5 is connected with the entrance of heater 6, and heater 6 goes out
Mouth is connected with 7 entrance of reactor；The equipment for providing oxidant is connected with 7 entrance of reactor；Sludge pretreatment unit is pre-processed
Sludge afterwards is squeezed into high-temperature preheater 5 through high-pressure frequency-conversion plunger pump 4, is occurred with the high temperature fluid after supercritical water oxidation
Heat exchange makes sludge reach super critical condition, enters in reactor 7 after then flowing through heater 6, oxidant is in reactor 7
Homogeneous reaction occurs at supercritical conditions with the organic matter in the sludge that handles through high temperature preheating, organic matter is oxidized to CO2、
N2And H2O.The high temperature fluid of heat exchange is carried out for the first time from heater 6, and heater 6 is only used in starting and shutdown.
The post-reaction treatment unit includes decompression separative unit 9, reboiler 11, deamination unit 10；The UTILIZATION OF VESIDUAL HEAT IN
Unit includes utilizing waste heat for refrigeration heating unit 8, waste heat heating unit 12.
The outlet of reactor 7 is connected with 5 hot fluid side entrance of high-temperature preheater, 5 hot fluid side outlet of high-temperature preheater and again
It boils 11 hot fluid side entrance of device to be connected, 11 hot fluid side outlet of reboiler and hot fluid side entrance phase in pyrohydrolysis reactor 3
Even, hot fluid side outlet is connected with 1 hot fluid side entrance of sludge preheating can in pyrohydrolysis reactor 3,1 hot fluid of sludge preheating can
Side outlet is connected with 8 entrance of utilizing waste heat for refrigeration heating unit, and utilizing waste heat for refrigeration heats unit 8 outlet and decompression 9 entrance phase of separative unit
Even, the outlet of decompression separative unit 9 is connected with 10 material side entrance of deamination unit.
10 material side outlet of deamination unit is divided into two-way, is connected all the way with 11 material side entrance of reboiler, all the way with waste heat
12 entrance of heating unit is connected, and waste heat heats 12 unit outlet materials can non-pollution discharge；11 material side outlet of reboiler and de-
10 steam side entrance of ammonia unit is connected.
The supercritical water oxidation sludge treating system that energy multi-level of the invention utilizes, when in use:
High temperature fluid after reacting in reactor 7 enters high-temperature preheater 5, is pumped in high-temperature preheater 5 to subsequent
Sludge carry out pre-heating heat-exchanging, the fluid after cooling enters in reboiler 11, subsequently into adding in pyrohydrolysis reactor 3 to sludge
Heat heating brings it about pyrohydrolysis reaction, enters sludge preheating can 1 afterwards and carries out first order preheating to sludge, subsequently into waste heat system
Cold heating unit 8 carries out waste heat recycling, make to enter after fluid temperature reduction to the set temperature of decompression separative unit 9 pressure unit 9 into
Row decompression separation, treated, and fluid enters subsequent deamination unit 10, and fluid a part through deamination enters the waste heat system in downstream
Hot cell 12 carries out the heat recovery of afterbody, and another part then enters in reboiler 11, by subsequent pre- from high temperature
The hot fluid heats of hot device 5 evaporate, and generate steam as vapor source, steam enters 10 pairs of deamination unit through being depressured separative unit 9
Fluid after decompression separation is evaporated deamination.
Later all can some deamination fluid enter reboiler 11, carried out with the hot fluid from high-temperature preheater 5
Heat exchange, deamination fluid are heated evaporation and generate steam, and the hot fluid for being simultaneously from high-temperature preheater 5 will cool down, then into
Enter in hydrolysis reactor 3.By circulating and evaporating, cycle heat exchange, the duration for realizing total system waste heat is utilized.
Only first enter the heat outside the sludge needs of sludge preheating can 1, pyrohydrolysis reactor 3, high-temperature preheater 5
Heat temperature raising can preheat the subsequent sludge into system using the reaction heat in reactor 7 later, substantially reduce
Energy consumption and thermal loss in system operation, it is no longer necessary to which outside provides thermal energy and mentions to reduce the operating cost of system
The economy of high system facilitates the popularization and application of supercritical Water Oxidation Technology.
Heat exchanger and blender are equipped in the sludge preheating can 1, heat exchanger form can be coil and water leg
Formula, agitator type can be paddle agitator, turbine agitator, anchor agitator, helix(ribbon type) agitator etc..
Be equipped with heat exchanger and blender in the sludge pyrohydrolysis reactor 3, heat exchanger form can for coil and
Water-jacket, agitator type can be paddle agitator, turbine agitator, anchor agitator, helix(ribbon type) agitator etc..
5 form of high-temperature preheater is double pipe heat exchanger, and heat exchanger tube spread pattern is not limited to U-tube etc..
6 form of heater can be electromagnetic heater, infrared heater, resistance heater etc..
7 form of reactor can be tubular reactor, tank reactor etc..
11 form of reboiler can for thermosyphon reboiler, forced cyclic type reboiler, kettle type reboiler etc., in
Heat exchange form of tubes in portion's can be shell and tube, spiral coil etc..
Certainly, reboiler 11 of the invention is not limited to be connected between high-temperature preheater 5 and pyrohydrolysis reactor 3, described
Utilizing waste heat for refrigeration heating unit 8 is not limited to be connected between sludge preheating can 1 and decompression separative unit 9, the waste heat heating unit
12 are not limited to be connected to after deamination unit 10, i.e., the described hot fluid process sequence is not limited to the described above, with specific reference to waste heat
Quality carry out rationally efficient cascade utilization.
The exhaust heat stepped of supercritical water oxidation Treatment of Sludge of the invention utilizes method, is based on above-mentioned exhaust heat stepped utilize
System, comprising the following steps:
1) sludge enters progress first order pre-heating temperature elevation in sludge preheating can, until partial size is small after homogenizing emulsifying pump is ground
Sludge after default value, grinding enters pyrohydrolysis reactor and carries out pre-heating temperature elevation, makes sludge that pyrohydrolysis reaction occur, glues
Degree is decreased to default value；
2) step 1) treated sludge is squeezed into high-temperature preheater through high-pressure frequency-conversion plunger pump, then flows through heater
Enter in reactor afterwards；
3) oxidant occurs with the organic matter in the sludge that handles through step 2) at supercritical conditions in the reactor
Phase reaction, organic matter are oxidized to CO2、N2And H2O, the high temperature fluid after reaction enter high-temperature preheater, enter high temperature with subsequent
Heat exchange occurs for the sludge of preheater, preheats to the sludge of subsequent entrance；
4) fluid after step 3) heat exchange cooling enters in reboiler, enters in pyrohydrolysis reactor heat to sludge afterwards
Heating brings it about pyrohydrolysis reaction, first order preheating is carried out to sludge into sludge preheating can, subsequently into utilizing waste heat for refrigeration system
Hot cell carries out waste heat recycling, makes fluid temperature reduction to the set temperature for being depressured separative unit；
5) fluid through step 4) enters decompression separative unit and carries out decompression separation, and treated fluid enters subsequent deamination
Unit；
6) fluid a part through step 5) deamination enter waste heat heating unit carry out heat recovery, another part into
Enter in reboiler, steam is generated by the subsequent hot fluid heats evaporation from high-temperature preheater, steam enters deamination unit to warp
Fluid after decompression separative unit decompression separation is evaporated deamination, and the hot fluid for being simultaneously from high-temperature preheater will cool down,
Subsequently into hydrolysis reactor, it is again introduced into deamination unit according to path described in step 4) and step 5) later, starts to follow
Ring.
The above content is merely illustrative of the invention's technical idea, and this does not limit the scope of protection of the present invention, all to press
According to technical idea proposed by the present invention, any changes made on the basis of the technical scheme each falls within claims of the present invention
Protection scope within.
Claims (9)
1. a kind of the exhaust heat stepped of supercritical water oxidation Treatment of Sludge utilizes system, which is characterized in that including sludge pretreatment list
Member, supercritical water oxidation unit, post-reaction treatment unit and UTILIZATION OF VESIDUAL HEAT IN unit；
The sludge pretreatment unit includes sludge preheating can (1), homogenizing emulsifying pump (2) and pyrohydrolysis reactor (3), and sludge is pre-
Hot tank (1) material side outlet is connected with homogenizing emulsifying pump (2) entrance, homogenizing emulsifying pump (2) outlet and pyrohydrolysis reactor (3) object
Expect that side entrance is connected, pyrohydrolysis reactor (3) material side outlet is connected with supercritical water oxidation unit entrance；
The supercritical water oxidation unit includes high-pressure frequency-conversion plunger pump (4), high-temperature preheater (5), heater (6) and reactor
(7), high-pressure frequency-conversion plunger pump (4) entrance is connected with pyrohydrolysis reactor (3) material side outlet, and high-pressure frequency-conversion plunger pump (4) goes out
Mouth is connected with high-temperature preheater (5) material side entrance, the entrance phase of the material side outlet and heater (6) of high-temperature preheater (5)
Even, the outlet of heater (6) is connected with reactor (7) entrance, and reactor (7) is also connected with the equipment for oxidant；
The post-reaction treatment unit includes decompression separative unit (9), reboiler (11), deamination unit (10), UTILIZATION OF VESIDUAL HEAT IN list
Member includes utilizing waste heat for refrigeration heating unit (8) and waste heat heating unit (12)；
Reactor (7) outlet is connected with high-temperature preheater (5) hot fluid side entrance, high-temperature preheater (5) hot fluid side outlet and
Reboiler (11) hot fluid side entrance is connected, the hot-fluid side of reboiler (11) hot fluid side outlet and pyrohydrolysis reactor (3)
Entrance is connected, and the hot fluid side outlet of pyrohydrolysis reactor (3) is connected with sludge preheating can (1) hot fluid side entrance, and sludge is pre-
Hot tank (1) hot fluid side outlet is connected with utilizing waste heat for refrigeration heating unit (8) entrance, utilizing waste heat for refrigeration heating unit (8) outlet and drop
Separative unit (9) entrance is pressed to be connected, decompression separative unit (9) outlet is connected with deamination unit (10) material side entrance；
Deamination unit (10) the material side outlet is divided into two-way, is connected all the way with waste heat heating unit (12) entrance, another way
It is connected with reboiler (11) material side entrance；
Reboiler (11) the material side outlet is also connected with deamination unit (10) steam side entrance.
2. a kind of the exhaust heat stepped of supercritical water oxidation Treatment of Sludge according to claim 1 utilizes system, feature exists
In equipped with heat exchanger and blender in the sludge preheating can (1).
3. a kind of the exhaust heat stepped of supercritical water oxidation Treatment of Sludge according to claim 1 utilizes system, feature exists
In equipped with heat exchanger and blender in the pyrohydrolysis reactor (3).
4. a kind of the exhaust heat stepped of supercritical water oxidation Treatment of Sludge according to claim 2 or 3 utilizes system, feature
It is, heat exchanger uses coil heat exchanger or water-jacket heat exchanger, and blender is stirred using paddle agitator, turbine type
Mix device, anchor agitator or helix(ribbon type) agitator.
5. a kind of the exhaust heat stepped of supercritical water oxidation Treatment of Sludge according to claim 1 utilizes system, feature exists
In the high-temperature preheater (5) is double pipe heat exchanger.
6. a kind of the exhaust heat stepped of supercritical water oxidation Treatment of Sludge according to claim 1 utilizes system, feature exists
In the heater (6) is electromagnetic heater, infrared heater or resistance heater.
7. a kind of the exhaust heat stepped of supercritical water oxidation Treatment of Sludge according to claim 1 utilizes system, feature exists
In the reactor (7) is tubular reactor or tank reactor.
8. a kind of the exhaust heat stepped of described in any item supercritical water oxidation Treatment of Sludge utilizes system according to claim 1~7,
It is characterized in that, the reboiler (11) be thermosyphon reboiler, forced cyclic type reboiler or kettle type reboiler, inside
The form of tubes that exchanges heat is shell and tube or spiral coil.
9. a kind of the exhaust heat stepped of supercritical water oxidation Treatment of Sludge utilizes method, based on described in any one of claim 1~8
It is exhaust heat stepped utilize system, which comprises the following steps:
1) sludge, which enters, carries out first order pre-heating temperature elevation in sludge preheating can (1), until partial size after homogenizing emulsifying pump (2) grinding
Less than default value, the sludge after grinding enters pyrohydrolysis reactor (3) and carries out pre-heating temperature elevation, makes sludge that pyrohydrolysis occur anti-
It answers, viscosity is decreased to default value；
2) step 1) treated sludge is squeezed into high-temperature preheater (5) through high-pressure frequency-conversion plunger pump (4), then flows through heating
Device (6) enters in reactor (7) afterwards；
3) oxidant occurs homogeneously in reactor (7) with the organic matter in the sludge that handles through step 2) at supercritical conditions
Reaction, organic matter are oxidized to CO2、N2And H2O, the high temperature fluid after reaction enter high-temperature preheater (5), enter height with subsequent
Heat exchange occurs for the sludge of warm preheater (5), preheats to the sludge of subsequent entrance；
4) fluid after step 3) heat exchange cooling enters in reboiler (11), enters in pyrohydrolysis reactor (3) to sludge afterwards
Heat temperature raising brings it about pyrohydrolysis reaction, first order preheating is carried out to sludge into sludge preheating can (1), subsequently into waste heat
Cooling and warming unit (8) carries out waste heat recycling, makes fluid temperature reduction to the set temperature for being depressured separative unit (9)；
5) fluid through step 4) enters decompression separative unit (9) and carries out decompression separation, and treated fluid enters subsequent deamination
Unit (10)；
6) fluid a part through step 5) deamination enter waste heat heating unit (12) carry out heat recovery, another part into
Enter in reboiler (11), steam is generated by the subsequent hot fluid heats evaporation from high-temperature preheater (5), steam enters deamination list
First (10) are evaporated deamination to the fluid after decompression separative unit (9) decompression separation, are simultaneously from high-temperature preheater (5)
Hot fluid enters in hydrolysis reactor (3) after being cooled down, and is again introduced into deamination list according to the path of step 4) He step 5) later
First (10), start the cycle over, until flowing the zero-emission up to standard for realizing sludge of intracorporal ammonia content.
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| CN112209549A (en) * | 2020-09-18 | 2021-01-12 | 西安交通大学 | Hospital comprehensive energy system for energy utilization of medical wastewater |
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| CN113185071A (en) * | 2021-04-07 | 2021-07-30 | 西安交通大学 | Sludge treatment system and method with catalysis and pyrohydrolysis assisted hydrothermal carbonization |
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