CN114075456A - Sludge pyrohydrolysis-assisted supercritical water gasification treatment system and method with two-stage waste heat recovery - Google Patents
Sludge pyrohydrolysis-assisted supercritical water gasification treatment system and method with two-stage waste heat recovery Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 136
- 238000002309 gasification Methods 0.000 title claims abstract description 125
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 115
- 239000002918 waste heat Substances 0.000 title claims abstract description 89
- 238000011084 recovery Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 64
- 238000009283 thermal hydrolysis Methods 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 44
- 238000005485 electric heating Methods 0.000 claims abstract description 10
- 238000004064 recycling Methods 0.000 claims abstract description 4
- 239000003054 catalyst Substances 0.000 claims description 32
- 239000000047 product Substances 0.000 claims description 29
- 239000007789 gas Substances 0.000 claims description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 14
- 229910052739 hydrogen Inorganic materials 0.000 claims description 14
- 239000001257 hydrogen Substances 0.000 claims description 14
- 239000007790 solid phase Substances 0.000 claims description 11
- 239000007795 chemical reaction product Substances 0.000 claims description 10
- 238000000926 separation method Methods 0.000 claims description 10
- 239000012071 phase Substances 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 229910018054 Ni-Cu Inorganic materials 0.000 claims description 4
- 229910018481 Ni—Cu Inorganic materials 0.000 claims description 4
- 239000008346 aqueous phase Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 21
- 238000005265 energy consumption Methods 0.000 abstract description 14
- 239000003344 environmental pollutant Substances 0.000 abstract description 5
- 231100000719 pollutant Toxicity 0.000 abstract description 5
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 description 5
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- 150000001875 compounds Chemical class 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
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- 239000000203 mixture Substances 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 208000034699 Vitreous floaters Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
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- 238000000629 steam reforming Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
- C10J3/72—Other features
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10J—PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES; CARBURETTING AIR OR OTHER GASES
- C10J2300/00—Details of gasification processes
- C10J2300/09—Details of the feed, e.g. feeding of spent catalyst, inert gas or halogens
- C10J2300/0913—Carbonaceous raw material
- C10J2300/0926—Slurries comprising bio-oil or bio-coke, i.e. charcoal, obtained, e.g. by fast pyrolysis of biomass
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
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- Chemical & Material Sciences (AREA)
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- Combustion & Propulsion (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention discloses a sludge pyrohydrolysis auxiliary supercritical water gasification treatment system and method with two-stage waste heat recovery, and belongs to the technical field of sludge treatment. The treatment device comprises a sludge slurrying machine, a high-pressure sludge delivery pump, a primary waste heat recovery preheater, a sludge preheater, a thermal hydrolysis reactor, a secondary waste heat recovery preheater, a hydrothermal solution preheater, a supercritical water gasification reactor, an electric heating device, a gasification product cooler, a back pressure valve, a gas-liquid separator and a solid-liquid separator. The invention designs the sludge treatment system for recycling the two-stage waste heat by combining the thermal hydrolysis technology and the supercritical water gasification technology, can improve the sludge treatment efficiency, the gasification reaction efficiency and the yield, simultaneously recycles the reaction waste heat to reduce the operation energy consumption of the system, does not generate pollutants such as dioxin and the like, and reduces the secondary pollution. The whole system has economic and ecological values, and provides a certain idea for resource utilization of sludge.
Description
Technical Field
The invention belongs to the technical field of sludge treatment, and relates to a sludge pyrohydrolysis auxiliary supercritical water gasification treatment system and method with two-stage waste heat recovery.
Background
The urban sludge is a general term for substances such as a small amount of precipitates, particles, floaters and the like generated by treating urban sewage, and the sludge yield with the water content of 80 wt% in China in 2020 is about 6000 million tons. The sludge, especially the municipal sludge, has the characteristics of high water content, rich organic matters and the like, and simultaneously contains inorganic components, pathogenic microorganisms, a large amount of toxic and harmful pollutants and the like. At present, methods such as landfill, composting, pyrolysis and incineration are common sludge treatment and disposal technologies, but the methods all have the problems of secondary pollution or high energy consumption and the like, so that most of sludge cannot be properly disposed, and the resource utilization rate is low. In particular, the incineration method generates a great deal of pollutants including CO, NOx, SO2, PCDD/Fs and heavy metals, and causes great harm to the environment.
In recent years, supercritical water gasification sludge treatment technology has been rapidly developed due to its outstanding advantages. The technology utilizes the special properties of water in a supercritical state (T >374.15 ℃, P >22.12MPa), organic matters in sludge are subjected to various reactions such as dehydration, cracking and the like in supercritical water to generate micromolecule compounds, and then hydrogen-rich mixed gas such as H2, CH4, CO2, CO and the like is generated through steam reforming, water gas shift and methanation reaction, so that the dissolubility of the organic matters can be improved, the formation of tar and coke can be prevented, the high-energy consumption drying defect of the traditional gasification is overcome, and secondary pollution can not be caused. At present, the supercritical water gasification sludge treatment technology has been developed into one of the important technologies for efficiently and harmlessly treating sludge. However, the supercritical water gasification sludge treatment technology still has the following two problems: firstly, the sludge treatment efficiency, the gasification reaction efficiency and the gas production rate are lower; secondly, a large amount of heat is needed to preheat the sludge raw material to the reaction temperature in the reaction process of treating the sludge by supercritical water gasification, but the self-heating balance cannot be realized because the sludge raw material is subjected to endothermic reaction, and the energy consumption of the system operation is large. The two problems become important restriction factors for the large-scale development of the supercritical water gasification sludge treatment technology.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a sludge pyrohydrolysis auxiliary supercritical water gasification treatment system and method with two-stage waste heat recovery, so as to solve the problems of serious secondary pollution, high system operation energy consumption, low resource utilization rate, low sludge treatment efficiency, low gasification reaction efficiency and low yield of hydrogen-rich mixed gas in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a sludge pyrohydrolysis auxiliary supercritical water gasification treatment system with two-stage waste heat recovery, which comprises: the system comprises a sludge slurrying machine, a thermal hydrolysis unit, a supercritical water gasification sludge treatment unit and a product separation unit;
the thermal hydrolysis unit comprises a primary waste heat recovery preheater, a sludge preheater and a thermal hydrolysis reactor which are sequentially connected, wherein a first inlet of the primary waste heat recovery preheater is connected with an outlet end of the sludge slurrying machine, a first outlet of the primary waste heat recovery preheater is connected with an inlet of the sludge preheater, a second outlet of the primary waste heat recovery preheater is connected with a product separation unit, an outlet of the sludge preheater is connected with a first inlet of the thermal hydrolysis reactor, and a second inlet of the thermal hydrolysis reactor is used for introducing a catalyst I;
the supercritical water gasification sludge treatment unit comprises a secondary waste heat recovery preheater, a hydrothermal solution preheater and a supercritical water gasification reactor which are sequentially connected, wherein a first inlet of the secondary waste heat recovery preheater is connected with an outlet of the pyrohydrolysis reactor, a first outlet of the secondary waste heat recovery preheater is connected with a second inlet of the primary waste heat recovery preheater, a second outlet of the secondary waste heat recovery preheater is connected with an inlet of the hydrothermal solution preheater, an outlet of the hydrothermal solution preheater is connected with a first inlet of the supercritical water gasification reactor, a second inlet of the supercritical water gasification reactor is used for introducing a catalyst II, and an outlet of the supercritical water gasification reactor is connected with a second inlet of the secondary waste heat recovery preheater; an electric heating device is also arranged outside the supercritical water gasification reactor.
Preferably, the product separation unit comprises a gasification product cooler, a back pressure valve, a gas-liquid separator and a solid-liquid separator which are sequentially connected, wherein an inlet of the gasification product cooler is connected with a second outlet of the primary waste heat recovery preheater, an outlet of the gasification product cooler is connected with an inlet of the gas-liquid separator, a first outlet of the gas-liquid separator is connected with an inlet of the solid-liquid separator, a second outlet of the gas-liquid separator is used for recycling the hydrogen-rich mixed gas, a first outlet of the solid-liquid separator is used for recovering water phase discharge, and a second outlet of the solid-liquid separator is used for recovering solid phase residue.
Further preferably, the solid-liquid separator employs a filter centrifuge or a decanter centrifuge.
Preferably, the reaction temperature of the thermal hydrolysis reactor is set to be 100-200 ℃.
Preferably, the reaction temperature in the supercritical water gasification reactor is set to be 450-650 ℃.
Preferably, a high-pressure sludge delivery pump is further arranged on a pipeline connecting the sludge slurrying machine and the thermal hydrolysis unit.
Preferably, the catalyst I is a carbonaceous catalyst.
Preferably, the catalyst II is Ni-Cu/AC.
The invention also discloses a method of the sludge pyrohydrolysis-assisted supercritical water gasification treatment system based on the two-stage waste heat recovery, which comprises the following steps:
s1: after being slurried in a sludge slurrying machine, the sludge is sequentially conveyed to a primary waste heat recovery preheater and a sludge preheater to be preheated to the required thermal hydrolysis reaction temperature, the preheated sludge enters a thermal hydrolysis reactor, meanwhile, a catalyst I is added, and the preheated sludge is subjected to thermal hydrolysis reaction under the action of the catalyst I to obtain hydrothermal solution;
s2: the hydrothermal solution is preheated to the required supercritical water gasification reaction temperature through a secondary waste heat recovery preheater and a hydrothermal solution preheater in sequence, the preheated hydrothermal solution enters a supercritical water gasification reactor, a catalyst II is added at the same time, the preheated hydrothermal solution is subjected to supercritical water gasification reaction under the action of the catalyst II, and an electric heating device keeps the temperature in the supercritical water gasification reactor within the temperature range required by the supercritical water gasification reaction in the process to obtain a supercritical water gasification high-temperature reaction product;
s3: preheating hydrothermal solution and sludge raw materials generated by a thermal hydrolysis reaction by a supercritical water gasification high-temperature reaction product through a secondary waste heat recovery preheater and a primary waste heat recovery preheater in sequence, and then cooling in a product separation unit;
s4: and separating and recovering the cooled supercritical water gasification reaction product in a product separation unit to obtain hydrogen-rich mixed gas, solid-phase residue and water-phase effluent.
Compared with the prior art, the invention has the following beneficial effects:
the sludge treatment system and the method disclosed by the invention combine the pyrohydrolysis technology and the supercritical water gasification technology to treat the sludge, and the temperature of the preheated sludge entering the pyrohydrolysis reactor can be controlled by adjusting the primary waste heat recovery preheater and the sludge preheater, so that the required pyrohydrolysis reaction temperature can be accurately regulated and controlled; preheating sludge, performing thermal hydrolysis reaction pretreatment in a thermal hydrolysis reactor to obtain hydrothermal solution, sending the hydrothermal solution to a supercritical water gasification reactor to perform supercritical water gasification reaction, controlling the temperature of the preheating hydrothermal solution entering the supercritical water gasification reactor by adjusting a secondary waste heat recovery preheater and a hydrothermal solution preheater, and further accurately regulating and controlling the temperature to the required supercritical water gasification reaction temperature, supplementing heat when the secondary waste heat recovery preheater and the hydrothermal solution preheater provide insufficient heat for the supercritical water gasification reactor by an electric heating device, wherein organic matters and the like in the sludge can be completely crushed by the pretreated thermal hydrolysis reaction, bound water is released, the water content of the sludge is increased, the viscosity is reduced, and the supercritical water gasification reaction of the sludge is facilitated, so that high-concentration sludge can be treated, and the yield of hydrogen-rich mixed gas and the resource utilization rate of the sludge are increased; the combination of the thermal hydrolysis technology and the supercritical water gasification technology improves the sludge treatment efficiency, the gasification reaction efficiency and the yield, and reduces the energy consumption of the system operation. In addition, the primary waste heat recovery preheater and the secondary waste heat recovery preheater are arranged to form two-stage waste heat recovery preheating to preheat the sludge raw material and the thermal hydrolysis hydrothermal solution, so that the energy consumption of system operation is reduced. The hydrothermal solution and the sludge raw material generated by the thermal hydrolysis reaction are sequentially preheated by the high-temperature product reacted in the supercritical water gasification reactor through the secondary waste heat recovery preheater and the primary waste heat recovery preheater, so that the resource utilization rate of the sludge is improved, and the energy consumption of system operation is reduced.
Further, the supercritical water gasification reaction product is cooled in a gasification product cooler, the cooled supercritical water gasification reaction product is conveyed to a gas-liquid separator to separate and recover hydrogen-rich mixed gas, and the residual solid-liquid mixture is conveyed to a solid-liquid separator to separate solid-phase residue and water-phase effluent, and then the solid-phase residue and the water-phase effluent are respectively discharged.
Furthermore, the solid-liquid separator adopts a filter type centrifuge or a sedimentation type centrifuge, so that filter residues with low moisture content can be obtained, and the subsequent treatment process of solid-phase residues is facilitated.
Furthermore, the hydrogen-rich mixed gas is output from the second outlet of the gas-liquid separator, the water phase effluent is output from the first outlet of the solid-liquid separator, and the solid phase residue is output from the second outlet of the solid-liquid separator, so that the product can be classified and treated, and secondary pollution can be avoided.
Furthermore, the reaction temperature range in the thermal hydrolysis reactor is 100-200 ℃, the thermal hydrolysis reaction is carried out on the sludge at a lower temperature than that of the conventional incineration method, and the generation of difficultly-degradable COD compounds and relatively higher energy consumption are avoided.
Furthermore, the reaction temperature range in the supercritical water gasification reactor is 450-650 ℃, which is beneficial to the smooth proceeding of the supercritical water gasification reaction.
Furthermore, a high-pressure sludge delivery pump is arranged between the sludge slurrying machine and the thermal hydrolysis unit, so that the sludge can be rapidly delivered to the thermal hydrolysis reaction unit for reaction.
Furthermore, the catalyst I is a carbonaceous catalyst, which is beneficial to promoting the thermal hydrolysis reaction.
Furthermore, the catalyst IINi-Cu/AC is beneficial to improving the hydrogen gasification efficiency and promoting the methanation reaction, thereby improving H2And CH4The efficiency is higher than that of other catalysts.
The invention discloses a method of a sludge pyrohydrolysis auxiliary supercritical water gasification treatment system based on two-stage waste heat recovery, which can control the temperature of preheated sludge entering a pyrohydrolysis reactor by combining a pyrohydrolysis technology and a supercritical water gasification technology and adjusting a primary waste heat recovery preheater and a sludge preheater so as to accurately regulate and control the temperature to the required pyrohydrolysis reaction temperature; preheating sludge is firstly pretreated into hydrothermal solution in a pyrohydrolysis reactor through a pyrohydrolysis reaction, then the hydrothermal solution is sent to a supercritical water gasification reactor to carry out supercritical water gasification reaction, the temperature of the preheating hydrothermal solution entering the supercritical water gasification reactor can be controlled by adjusting a secondary waste heat recovery preheater and a hydrothermal solution preheater, and then the temperature is accurately regulated to the required supercritical water gasification reaction temperature, organic matters and the like in the sludge can be completely crushed through the pretreated pyrohydrolysis reaction, bound water is released, the water content of the sludge is increased, the viscosity is reduced, the supercritical water gasification reaction of the sludge is facilitated, and therefore high-concentration sludge can be treated, and the yield of hydrogen-rich mixed gas and the resource utilization rate of the sludge are increased; the sludge treatment efficiency, the gasification reaction efficiency and the yield are improved, the reaction waste heat is recycled to reduce the system operation energy consumption, pollutants such as dioxin are not generated, and the secondary pollution is reduced. The whole system has economic and ecological values, and provides a certain idea for resource utilization of sludge.
Drawings
FIG. 1 is a schematic diagram of a system structure of a sludge pyrohydrolysis-assisted supercritical water gasification treatment system and method with two-stage waste heat recovery according to the present invention.
Wherein: 1-sludge slurrying machine; 2-high pressure sludge delivery pump; 3-primary waste heat recovery preheater; 4-sludge preheater; 5-a thermal hydrolysis reactor; 6-secondary waste heat recovery preheater; 7-hydrothermal solution preheater; 8-supercritical water gasification reactor; 9-an electric heating device; 10-a gasification product cooler; 11-back pressure valve; 12-a gas-liquid separator; 13-solid-liquid separator.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the two-stage waste heat recovery sludge pyrohydrolysis auxiliary supercritical water gasification treatment system comprises a sludge slurrying machine 1, a high-pressure sludge delivery pump 2, a primary waste heat recovery preheater 3, a sludge preheater 4, a pyrohydrolysis reactor 5, a secondary waste heat recovery preheater 6, a hydrothermal solution preheater 7, a supercritical water gasification reactor 8, an electric heating device 9, a gasification product cooler 10, a back pressure valve 11, a gas-liquid separator 12 and a solid-liquid separator 13.
The system connection mode is as follows: the inlet of the sludge slurrying machine 1 is a sludge inlet, the outlet of the sludge slurrying machine is connected with the first inlet a of the primary waste heat recovery preheater 3, and a high-pressure sludge delivery pump 2 is arranged on a pipeline connecting the sludge slurrying machine 1 and the primary waste heat recovery preheater 3; the first outlet b of the primary waste heat recovery preheater 3 is connected with the inlet of the sludge preheater 4; a first inlet e of the thermal hydrolysis reactor 5 is connected with an outlet of the sludge preheater 4, a second inlet f is an inlet of the catalyst I, and an outlet g of the thermal hydrolysis reactor 5 is connected with a first inlet h of the secondary waste heat recovery preheater 6; a second outlet i of the secondary waste heat recovery preheater 6 is connected with an inlet of the hydrothermal solution preheater 7; a first inlet I of the supercritical water gasification reactor 8 is connected with an outlet of the hydrothermal solution preheater 7, a second inlet m is an inlet of the catalyst II, an outlet n is connected with a second inlet j of the secondary waste heat recovery preheater 6, and an electric heating device 9 is arranged outside the supercritical water gasification reactor 8; a first outlet k of the secondary waste heat recovery preheater 6 is connected with a second inlet c of the primary waste heat recovery preheater 3; the inlet of the gasification product cooler 10 is connected with the second outlet d of the primary waste heat recovery preheater 3; an inlet o of the gas-liquid separator 12 is connected with an outlet of the gasification product cooler 10, a pipeline connecting the gasification product cooler 10 and the gas-liquid separator 12 is provided with a back pressure valve 11, a second outlet p is a hydrogen-rich mixed gas product outlet, and a first outlet q is connected with an inlet r of the solid-liquid separator 13; the first outlet t of the solid-liquid separator 13 is an aqueous phase effluent outlet, and the second outlet s is a solid phase residue outlet.
The invention combines the thermal hydrolysis technology and the supercritical water gasification technology to treat the sludge, the preheated sludge is firstly subjected to thermal hydrolysis reaction in the thermal hydrolysis reactor 5 to be pretreated into hot liquid, and then the hot liquid is sent to the supercritical water gasification reactor 8 to be subjected to supercritical water gasification reaction, so that the sludge treatment efficiency, the gasification reaction efficiency and the yield are improved, and the system operation energy consumption is reduced. The high-temperature product after reaction in the supercritical water gasification reactor 8 is preheated by hydrothermal solution and sludge raw materials generated by the thermal hydrolysis reaction through the secondary waste heat recovery preheater 6 and the primary waste heat recovery preheater 3 in sequence, so that the resource utilization rate of the sludge is improved, and the energy consumption of system operation is reduced. The temperature of the preheated sludge entering the thermal hydrolysis reactor 5 can be controlled by adjusting the primary waste heat recovery preheater 3 and the sludge preheater 4, so that the required thermal hydrolysis reaction temperature can be accurately regulated and controlled; the preheating hydrothermal solution temperature entering the supercritical water gasification reactor 8 can be controlled by adjusting the secondary waste heat recovery preheater 6 and the hydrothermal solution preheater 7, and then the required supercritical water gasification reaction temperature can be accurately regulated and controlled.
Further, the reaction temperature range in the thermal hydrolysis reactor 5 is 100-200 ℃, and the reaction temperature range in the supercritical water gasification reactor 8 is 450-650 ℃.
Furthermore, the catalyst I added in the thermal hydrolysis reactor 5 is a carbonaceous catalyst, and the catalyst II added in the supercritical water gasification reactor 8 is a Ni-Cu/AC catalyst.
Further, the solid-liquid separator 13 employs a filter centrifuge or a decanter centrifuge.
The invention also discloses a method of the sludge pyrohydrolysis-assisted supercritical water gasification treatment system based on two-stage waste heat recovery, which comprises the following steps:
s1: sludge enters from an inlet of the sludge slurrying machine 1 and is subjected to slurrying treatment in the sludge slurrying machine 1; the waste heat is conveyed to a primary waste heat recovery preheater 3 through a high-pressure sludge conveying pump 2 to exchange heat with supercritical water gasification high-temperature products, and waste heat is recycled; then preheating sludge to 150 ℃ in a sludge preheater 4, then entering a thermal hydrolysis reactor 5, simultaneously adding a carbonaceous catalyst from an inlet f of the thermal hydrolysis reactor 5, and carrying out thermal hydrolysis reaction on the preheated sludge under the action of the carbonaceous catalyst to prepare a hot liquid;
s2: the prepared hot liquid enters a secondary waste heat recovery preheater 6 to exchange heat with a supercritical water gasification high-temperature product, and waste heat is recovered and utilized; then preheating hot liquid enters a hot liquid preheater 7 to be preheated to 500 ℃, and then enters a supercritical water gasification reactor 8, meanwhile, a Ni-Cu/AC catalyst is added from an inlet m of the supercritical water gasification reactor 8, the preheating hot liquid is subjected to supercritical water gasification reaction under the action of the catalyst, an electric heating device 9 keeps the temperature in the supercritical water gasification reactor 8 at the required supercritical water gasification reaction temperature in the secondary process, and the pressure in the supercritical water gasification reactor 8 is controlled to be 23MPa by adjusting a back pressure valve 11;
s3: the supercritical water gasification high-temperature reaction product sequentially preheats hydrothermal solution and sludge raw materials generated by the thermal hydrolysis reaction through a secondary waste heat recovery preheater 6 and a primary waste heat recovery preheater 3, and then is cooled in a gasification product cooler 10;
s4: the supercritical water gasification reaction product after temperature reduction and pressure reduction is conveyed to a gas-liquid separator 12 to separate and recover hydrogen-rich mixed gas, and the residual solid-liquid mixture is conveyed to a solid-liquid separator 13 to separate solid phase residue and water phase effluent, and then the solid phase residue and the water phase effluent are respectively discharged.
In conclusion, the invention designs the sludge treatment system for recycling the two-stage waste heat by combining the thermal hydrolysis technology and the supercritical water gasification technology, and the system and the method can improve the sludge treatment efficiency, the gasification reaction efficiency and the yield of the hydrogen-rich mixed gas by combining the thermal hydrolysis technology and the supercritical water gasification technology to treat the sludge, reduce the operation energy consumption of the system and improve the resource utilization rate of the sludge. Meanwhile, reaction waste heat is recycled to reduce system operation energy consumption, pollutants such as dioxin and the like cannot be generated, and secondary pollution is reduced. The whole system has economic and ecological values, and provides a certain idea for resource utilization of sludge.
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. The utility model provides a supplementary supercritical water gasification processing system of sludge pyrohydrolysis of two-stage waste heat recovery which characterized in that includes: the system comprises a sludge slurrying machine (1), a thermal hydrolysis unit, a supercritical water gasification sludge treatment unit and a product separation unit;
the thermal hydrolysis unit comprises a primary waste heat recovery preheater (3), a sludge preheater (4) and a thermal hydrolysis reactor (5) which are sequentially connected, wherein a first inlet (a) of the primary waste heat recovery preheater (3) is connected with the outlet end of the sludge slurrying machine (1), a first outlet (b) of the primary waste heat recovery preheater (3) is connected with an inlet of the sludge preheater (4), a second outlet (d) of the primary waste heat recovery preheater (3) is connected with a product separation unit, an outlet of the sludge preheater (4) is connected with a first inlet (e) of the thermal hydrolysis reactor (5), and a second inlet (f) of the thermal hydrolysis reactor (5) is used for introducing a catalyst I;
the supercritical water gasification sludge treatment unit comprises a secondary waste heat recovery preheater (6), a hydrothermal solution preheater (7) and a supercritical water gasification reactor (8) which are connected in sequence, the first inlet (h) of the secondary waste heat recovery preheater (6) is connected with the outlet (g) of the thermal hydrolysis reactor (5), the first outlet (k) is connected with the second inlet (c) of the primary waste heat recovery preheater (3), the second outlet (i) is connected with the inlet of the hydrothermal solution preheater (7), the outlet of the hydrothermal solution preheater (7) is connected with the first inlet (l) of the supercritical water gasification reactor (8), the second inlet (m) of the supercritical water gasification reactor (8) is used for introducing a catalyst II, and the outlet (n) of the supercritical water gasification reactor (8) is connected with the second inlet (j) of the secondary waste heat recovery preheater (6); an electric heating device (9) is also arranged outside the supercritical water gasification reactor (8).
2. The two-stage waste heat recovery sludge pyrohydrolysis assisted supercritical water gasification treatment system according to claim 1, it is characterized in that the product separation unit comprises a gasification product cooler (10), a back pressure valve (11), a gas-liquid separator (12) and a solid-liquid separator (13) which are connected in sequence, the inlet of the gasification product cooler (10) is connected with the second outlet (d) of the primary waste heat recovery preheater (3), the outlet of the gasification product cooler (10) is connected with the inlet (o) of the gas-liquid separator (12), the first outlet (q) of the gas-liquid separator (12) is connected with the inlet (r) of the solid-liquid separator (13), the second outlet (p) is used for recycling the hydrogen-rich mixed gas, the first outlet (t) of the solid-liquid separator (13) is used for recovering an aqueous phase effluent and the second outlet(s) is used for recovering a solid phase residue.
3. The two-stage waste heat recovery sludge pyrohydrolysis-assisted supercritical water gasification treatment system according to claim 2, wherein the solid-liquid separator (13) is a filter centrifuge or a decanter centrifuge.
4. The two-stage waste heat recovery sludge pyrohydrolysis-assisted supercritical water gasification treatment system according to claim 1, wherein the reaction temperature of the pyrohydrolysis reactor (5) is set to be 100-200 ℃.
5. The two-stage waste heat recovery sludge pyrohydrolysis-assisted supercritical water gasification treatment system according to claim 1, wherein the reaction temperature in the supercritical water gasification reactor (8) is set to 450-650 ℃.
6. The two-stage waste heat recovery sludge pyrohydrolysis-assisted supercritical water gasification treatment system according to claim 1, wherein a high-pressure sludge delivery pump (2) is further arranged on a pipeline connecting the sludge slurrying machine (1) and the pyrohydrolysis unit.
7. The two-stage waste heat recovery sludge pyrohydrolysis assisted supercritical water gasification treatment system according to claim 1, wherein the catalyst I is a carbonaceous catalyst.
8. The two-stage waste heat recovery sludge pyrohydrolysis-assisted supercritical water gasification treatment system according to claim 1, wherein the catalyst II is Ni-Cu/AC.
9. The method for the sludge pyrohydrolysis-assisted supercritical water gasification treatment system based on the two-stage waste heat recovery of any one of claims 1 to 8, is characterized by comprising the following steps:
s1: after being slurried in a sludge slurrying machine (1), the sludge is sequentially conveyed to a primary waste heat recovery preheater (3) and a sludge preheater (4) to be preheated to the required thermal hydrolysis reaction temperature, the preheated sludge enters a thermal hydrolysis reactor (5), a catalyst I is added at the same time, and the preheated sludge is subjected to thermal hydrolysis reaction under the action of the catalyst I to obtain hydrothermal solution;
s2: the hydrothermal solution is preheated to the required supercritical water gasification reaction temperature through a secondary waste heat recovery preheater (6) and a hydrothermal solution preheater (7) in sequence, the preheated hydrothermal solution enters a supercritical water gasification reactor (8), a catalyst II is added at the same time, the preheated hydrothermal solution is subjected to supercritical water gasification reaction under the action of the catalyst II, an electric heating device (9) keeps the temperature in the supercritical water gasification reactor (8) within the temperature range required by the supercritical water gasification reaction in the process, and a supercritical water gasification high-temperature reaction product is obtained;
s3: the supercritical water gasification high-temperature reaction product sequentially preheats hydrothermal solution and sludge raw materials generated by the thermal hydrolysis reaction through a secondary waste heat recovery preheater (6) and a primary waste heat recovery preheater (3), and then is cooled in a product separation unit;
s4: and separating and recovering the cooled supercritical water gasification reaction product in a product separation unit to obtain hydrogen-rich mixed gas, solid-phase residue and water-phase effluent.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114939593A (en) * | 2022-05-12 | 2022-08-26 | 上海丝竺投资有限公司 | Supercritical water gasification zero-emission power generation system for household garbage and toxic soil hazardous waste |
| CN115181582A (en) * | 2022-07-07 | 2022-10-14 | 华北电力大学（保定） | Two-stage hydrothermal liquefaction waste heat utilization system and method |
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| CN102730917A (en) * | 2012-06-20 | 2012-10-17 | 河海大学 | Low-water-content dehydrated sludge direct supercritical water gasification processing apparatus and method |
| 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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| CN102730917A (en) * | 2012-06-20 | 2012-10-17 | 河海大学 | Low-water-content dehydrated sludge direct supercritical water gasification processing apparatus and method |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114939593A (en) * | 2022-05-12 | 2022-08-26 | 上海丝竺投资有限公司 | Supercritical water gasification zero-emission power generation system for household garbage and toxic soil hazardous waste |
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