WO2014086278A1 - Procédé et système de recyclage thermique pour l'énergie dans de la biomasse d'eau eutrophisée - Google Patents

Procédé et système de recyclage thermique pour l'énergie dans de la biomasse d'eau eutrophisée Download PDF

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WO2014086278A1
WO2014086278A1 PCT/CN2013/088433 CN2013088433W WO2014086278A1 WO 2014086278 A1 WO2014086278 A1 WO 2014086278A1 CN 2013088433 W CN2013088433 W CN 2013088433W WO 2014086278 A1 WO2014086278 A1 WO 2014086278A1
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water
heat
rich biomass
recovering
energy
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PCT/CN2013/088433
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English (en)
Chinese (zh)
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陈健
林卉
王梅燕
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福建新大陆环保科技有限公司
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Publication of WO2014086278A1 publication Critical patent/WO2014086278A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
    • C10L9/00—Treating solid fuels to improve their combustion
    • C10L9/08—Treating solid fuels to improve their combustion by heat treatments, e.g. calcining
    • C10L9/086—Hydrothermal carbonization
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
    • B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
    • 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
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • 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
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • 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
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
    • 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
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/20—Waste processing or separation

Definitions

  • the invention relates to the field of aqueous solids and liquid disposal with high COD content, in particular to a heat recovery method for recovering energy in water-rich biomass (ie high temperature and high pressure (HTP) drying method) and energy for recovering water-rich biomass using the method Heat recovery system.
  • HTP high temperature and high pressure
  • the water-rich biomass is commonly found: concentrates produced by sewage treatment with high COD content, sludge, and excrement produced by animals such as livestock and poultry (animals) Feces, etc.), kitchen waste (vegetable leaves, peels, leftovers, oils, etc.), garden waste (leaves and leaves produced by garden pruning), and farmland garbage (crops) and other water-rich biomass.
  • common treatments for water-rich biomass include landfill, composting, anaerobic digestion, thermal drying, electrodialysis drying, microwave drying, incineration, supercritical oxidation, etc., such as U.S. Patents 4,585,463, 4,398,476, 4,583,470, 4,769,157 and Chinese patent 98804492. 7.
  • the traditional method of water-rich biomass treatment taking the sludge incineration method as an example, generally directly incinerates sludge having a water content of 70%-90%, and then fills or solidifies the obtained ash into a new type of building.
  • the use of materials which can only achieve the effect of sludge reduction, does not produce the available energy. Since the moisture in the sludge evaporates and removes heat when the sludge is incinerated, it is generally necessary to externally add a combustion improver. Therefore, direct incineration is not only unable to recover the calorific value contained in the sludge, but also consumes a lot of energy, so it is not energy-saving and is not economical.
  • Another new method that has recently emerged to treat sludge by supercritical or subcritical oxidation is to heat and pressurize the sludge contained in an ultra-high temperature and high pressure reactor to supercritical temperature (temperature 374 ° C, pressure 22 MPa). ) or subcritical (temperature 200 ° C ⁇ 374 ° C, pressure 1.5 MPa ⁇ 22 MPa) high temperature and high pressure conditions, the direct oxidation treatment of sludge at this temperature and pressure; at this temperature and pressure, the sludge is large Some substances react with oxygen to thoroughly oxidize or decompose various substances in the sludge.
  • This method has the advantage of thorough sludge treatment, and the heat generated by it can be utilized as an energy source after being recovered.
  • a technical solution for achieving the first object of the present invention is: a heat recovery method for recovering energy in a water-rich biomass, comprising the steps of:
  • Step 2) - The temperature rise process, the temperature in the high-pressure closed container is controlled at 100 ° CT ⁇ 250 ° C, and the control pressure is in the range of 0. lMPa P ⁇ 3.97 MPa, so that the water-rich biomass is liquefied, and most of the raw The material components are not chemically decomposed, in a mixed aqueous solution state, and the temperature and pressure in the high-pressure closed vessel are kept constant and allowed to stand for a period of time, so that various biomass in the water-rich biomass and various solid inorganic impurities contained therein are separated. Due to the different specific gravity, the heavier solid inorganic impurities are precipitated to the bottom of the aqueous solution in the high pressure closed container, and the lighter biomass is floated to the upper portion of the aqueous solution in the high pressure closed container;
  • the step of the pressure is 0. lMPa P ⁇ 16, the pressure is controlled at a temperature of 100 ° CT ⁇ 350 ° C, the control pressure is 0. lMPa P ⁇ 16 In the range of 52 MPa, most of the biomass components are not chemically decomposed, and the water in the high-pressure closed vessel is boiled, producing high-temperature and high-pressure steam with impurities, deriving high-temperature and high-pressure steam, recycling energy, and enriching Water biomass dehydration; Step 4): After step 3), the heating is stopped, the high pressure sealed container is cooled and the waste heat is recovered, and then the lid of the high pressure closed container is opened, and the dehydrated and dried biomass and solid inorganic impurities which have been separated inside are taken out, and dehydrated. The dried biomass is used for energy recovery, and solid inorganic impurities are used for mineral and heavy metal recovery.
  • the water-rich biomass is various high-COD content aqueous solids and liquids, including: municipal sewage and other sewage produced by industrial and agricultural military production, and high COD content concentrated liquid and sludge produced by various purification treatments. a mixture of one or more of the water-rich biomass such as excrement, kitchen waste, garden waste, and farmland waste produced by animals such as livestock and poultry.
  • step 2) described in the heat recovery method for recovering energy in the water-rich biomass described in the first object can be used.
  • Process "and step 3""secondary temperature rise process” is combined into a one-time heating process, one-time rise and control the temperature in the high-pressure closed container at 100 ° CT ⁇ 350 ° C, the control pressure is 0. IMPa P ⁇ 16.52MPa Within the scope.
  • the heat recovery method for recovering energy in the water-rich biomass according to the first object of the present invention may further specifically be characterized as follows:
  • the heat recovery method for recovering energy in the water-rich biomass further includes the step 5): inputting the high temperature and high pressure steam with impurities derived from the step 3) into the heat exchanger as the first heat exchange medium, and simultaneously The clean second heat exchange medium is passed to the heat exchanger, and the heat of the high temperature and high pressure water vapor with impurities generated in the step 3) is completely exchanged to the clean second heat exchange medium output, and the second output is output after heat exchange.
  • the heat of the heat exchange medium is utilized to realize the recycling of energy required for dehydration of the water-rich biomass.
  • the heating method of the medium-high pressure sealed container is heat transfer oil medium heating, electric heating, high frequency, microwave, coal, oil, natural gas, solar energy, waste heat heating, or other heating methods.
  • step 8) the energy recovery method of the dehydrated biomass extracted in the step 4 is combustion, and the exothermic heat of the combustion process is used for the heating process of the steps 1) to 3) to recover the energy.
  • step 9) the ash generated by the combustion in the step 8) is recovered and recovered to recover nutrients such as nitrogen and potassium, and various precious metals.
  • Step 10) is further included: the inorganic impurities generated in the step 4) are recovered and recovered to recover nutrients such as nitrogen and potassium, and various precious metals.
  • Step 2) The temperature of the "first-stage heating process” is controlled at 110 ° C ⁇ 200 ° C, and the pressure is in the range of 0.14 MPa ⁇ 1.55 MPa; or
  • Step 2) The temperature of the "first-stage heating process” is controlled at 120 ° C ⁇ 180 ° C, and the pressure is in the range of 0.20 MPa ⁇ 1.00 MPa; or
  • Step 2) The temperature of the "first-stage heating process" is controlled at 130 °C and the pressure is 0.27 MPa ; or
  • Step 2) The temperature of the "first-stage heating process" is controlled at 150 °C and the pressure is 0.48 MPa; or The temperature is controlled at 170 ° C, the pressure is 0. 79MPa ; or
  • the range of the temperature is in the range of 0.2 MPa to 8.58 MPa; or
  • the range of the temperature is in the range of 0. 48MPa ⁇ 7. 44MPa; or
  • Step 2) The temperature of the "secondary temperature rise process” is controlled at 220 °C, and the pressure is
  • Step 2) The temperature of the "secondary temperature rise process” is controlled at 250 °C, and the pressure is
  • Step 2 The temperature of the "secondary temperature rising process" is controlled at 280 ° C and the pressure is 6. 41 MPa; or
  • the temperature is controlled at 320 ° C, and the pressure is 11.28 MPa ; or
  • the water content of the water-rich biomass in step 4) after dehydration and drying reaches 0% to 50%; or
  • the water-rich biomass extracted in step 4) is dehydrated and dried to a moisture content of 3% to 20%; or
  • the water-containing biomass extracted in step 4) is dehydrated and dried to a moisture content of 10% to 15%; or
  • the water-rich biomass extracted in step 4) is dehydrated and dried to a moisture content of 30%; or
  • the water-rich biomass extracted in step 4) is dehydrated and dried to a moisture content of 40%; or
  • the water-rich biomass extracted in step 4) is dehydrated and dried to a moisture content of 7%; or
  • the water content of the water-rich biomass extracted in step 4) is dehydrated and dried.
  • Step 1) When the medium-high pressure sealed container is heated by a heat transfer oil medium, Also included is a step 16): the residual heat recovered by cooling the high pressure closed vessel in step 4) is used for heating the heat transfer oil medium.
  • Step 17) Step 4)
  • the residual heat recovered by cooling the high pressure closed vessel can be used to dry the water-rich biomass.
  • the feed process for the sludge and the discharge process for the discharge of the internally dehydrated dried biomass and solid inorganic impurities are continuous processes.
  • the recovery method in the above 1 can also be specifically characterized as follows:
  • the second heat exchange medium is clean water, gas, liquid metal or other substance capable of heat exchange.
  • the clean water may be desalinated water, deionized water or distilled water.
  • step 6) using the heat of the second heat exchange medium outputted in the step 5) for generating electricity by the power generation system.
  • step 7) applying the heat of the second heat exchange medium outputted in the step 5) to the heating system heating or other industrial and agricultural applications of the municipal, industrial, agricultural, and military facilities.
  • step 11) Recycling and applying the waste water and waste gas generated after the high temperature and high pressure steam with impurities in the step 5) and the second heat exchange medium.
  • (6) further comprising the step of 19): applying the second heat exchange medium before the input heat exchanger to the cooling process of the high pressure closed vessel in the step 4) to recover the heat energy thereof and preheating the second heat exchange medium.
  • step 12 using the waste heat generated after the power generation system generates electricity for the heating of the high pressure closed vessel in the step 1).
  • step 14 when the heating method of the high-pressure closed container is heating by the heat-conducting oil medium, the waste heat generated after the power generation system generates electricity can be used for heating the heat-conductive oil medium.
  • step 15 the waste heat generated after the power generation system generates electricity can also be used for the preheating of the second heat exchange medium in the step 5).
  • the second heat exchange medium before the heat exchanger is used for the cooling process of the high pressure closed vessel in step 4) to recover the remaining heat, thereby achieving preheating of the second heat exchange medium.
  • the heat recovery method for recovering energy in the water-rich biomass of the invention is heated by a high-pressure closed-tank oil bath, and the heat is evenly distributed; the energy consumption of the temperature-enhanced pressure-increasing in the closed environment is low, and the heat released from the incineration of the water-rich biomass can be fully transferred to the sewage.
  • the large amount of high-temperature steam generated is converted into clean high-temperature and high-pressure steam through the heat exchanger, which can be used for heating system heating or other industrial and agricultural applications in municipal, industrial, agricultural and military facilities, generating new energy and realizing waste. For treasure.
  • the waste heat generated by high-temperature and high-pressure steam for power generation can be used for preheating of high-pressure closed containers and preheating of low-temperature second heat exchange medium, so as to achieve full recycling of energy and be more environmentally friendly.
  • the heating method of the high-pressure closed container is heated by the heat-conducting oil medium, the dehydrated and dried biomass produced by the high-pressure closed container can be directly burned into the heat-conducting oil boiler, and the heat is recovered for heating the heat-conducting oil to dry the water-rich biomass. Energy consumption in the process is minimized.
  • Another object of the present invention is to provide a novel water-rich biomass energy recovery system.
  • a technical solution for achieving the second object of the present invention is: a system for recovering energy in a water-rich biomass according to the first object of the present invention, which comprises at least a drying device and a heat collection and recovery device for high-temperature and high-pressure steam.
  • the drying apparatus comprises a high pressure closed vessel and a heating device for heating the high pressure closed vessel.
  • system for recovering energy in water-rich biomass according to the second object of the present invention may further specifically have the following characteristics:
  • a biomass burning boiler and an ash disposal device the high pressure sealed container is subjected to the step 1) of the heat recovery method according to the first object of the present invention, and the dehydrated and dried biomass is separated after the operation of the step 4) It is burned into a biomass burning boiler, and the ash generated by the combustion is sent to an ash disposal device for recycling nutrients such as nitrogen and potassium, and various precious metals.
  • the heating device is composed of a heat-conducting oil heating device and a heat-conducting oil boiler that heats the high-pressure sealed container; the heat-conducting oil boiler is connected to the heat-conducting oil heating device pipeline; and the high-pressure sealed container is integrated with the heat-conducting oil heating device.
  • a high-pressure closed container heat recovery unit for recovering residual heat from the high-pressure closed container.
  • the residual heat of the recovered high pressure closed vessel is used to heat the water-rich biomass and the second heat exchange medium.
  • the heat collection and recovery device of the high temperature and high pressure water vapor is a heat exchanger, and the high temperature and high pressure water vapor is used as the first heat exchange medium of the heat exchanger, and the second heat exchange medium is further provided.
  • a waste water exhaust gas collection and treatment system the steam output end of the high pressure closed container is connected to the first heat exchange medium input end of the heat exchanger, and the second heat exchange medium input end and the second exchange of the heat exchanger
  • the heat medium supply device is connected to the pipeline; the waste water output end of the heat exchanger is connected to the waste water treatment device.
  • system for recovering energy in the water-rich biomass including the technical features described in the above 3 may further specifically be characterized as follows: further comprising a heat recovery device for the high-pressure closed container, wherein the residual heat of the recovered high-pressure closed container is used for the opposite The heating of the heat transfer oil.
  • system for recovering energy in the water-rich biomass including the technical features described in the above 5 may further specifically have the following characteristics:
  • the second heat exchange medium of the heat exchanger is clean water
  • the water is converted into high temperature and high pressure water vapor output, the output of high temperature and high pressure water vapor (second heat exchange medium after heat exchange) and steam turbine power generation
  • the system is connected, that is, the heat of the second heat exchange medium outputted after the heat exchange is used for power generation.
  • the second heat exchange medium of the heat exchanger is clean water
  • the water is converted into a high temperature liquid water output after the heat exchange, and the output high temperature liquid water (the second heat exchange medium after heat exchange) is used for municipal Heating system heating or other industrial and agricultural applications such as industrial and agricultural and military facilities.
  • system for recovering energy in the water-rich biomass including the technical features described in the above 2) may further specifically have the following characteristics:
  • the heat recovery method for recovering energy in the water-rich biomass of the invention is heated by a high-pressure closed-tank oil bath, and the heat is evenly distributed; the energy consumption of the temperature-increasing pressure-increasing in the closed environment is low, and the heat released from the incineration of the water-rich biomass can be fully transferred to the sewage.
  • a large amount of high-temperature steam is generated and converted into clean high-temperature and high-pressure steam, which can be used for heating system heating or other industrial and agricultural applications in municipal, industrial, agricultural and military facilities, generating new energy and realizing waste. For treasure.
  • the waste heat generated by high-temperature and high-pressure steam for power generation can be used for preheating of high-pressure closed containers and preheating of low-temperature second heat exchange medium, so as to achieve full recycling of energy and be more environmentally friendly.
  • the dehydrated and dried biomass produced by the high-pressure closed container can be directly burned into the heat-conducting oil boiler, and the heat is recovered for heating the heat-conducting oil to dry the water-rich biomass. Energy consumption in the process is minimized.
  • FIG. 1 is a flow chart showing an embodiment of a heat recovery method for recovering energy in a water-rich biomass according to the first object of the present invention
  • Fig. 2 is a schematic view showing the structure of an embodiment of the energy recovery system in the water-rich biomass of the second object of the present invention. Concrete implementation
  • Embodiments of the present invention are further described below in conjunction with FIGS. 1 and 2.
  • Embodiment 1 is a diagrammatic representation of Embodiments of the present invention.
  • a method for recovering energy in water-rich biomass includes the following steps:
  • Step 1) The water-rich biomass (99.9%) is placed in a high-pressure closed container to heat the high-pressure closed container; the process of putting the water-rich biomass into a high-pressure closed container is also called feeding;
  • Step 2) - The temperature rise process is controlled to control the temperature in the high pressure closed vessel at 180 °C.
  • the pressure is at 1.0 MPa, the water-rich biomass is liquefied, and most of the biomass components are not chemically decomposed, in a mixed aqueous solution state, the temperature and pressure in the high-pressure closed vessel are kept constant and allowed to stand for 15 minutes to make the water-rich biomass
  • the biomass inside is separated from the solid inorganic impurities. Due to the different specific gravity, the heavier solid inorganic impurities precipitate to the bottom of the high pressure closed container, and the lighter biomass floats to the upper part of the high pressure closed container;
  • Step 3) The secondary temperature rising process, after separating the water-rich biomass and the solid inorganic impurities by the step 2), controlling the temperature in the high-pressure closed container at 260 ° C, the pressure at 5 MPa for about 20 minutes, most of the biomass components No chemical decomposition occurs, and the water in the high-pressure closed container is boiled, and high-temperature high-pressure steam containing high temperature and impurities is generated, and high-temperature high-pressure steam is derived to dehydrate the biomass in the water-rich biomass.
  • Step 4) After step 3), the pressure and temperature in the high-pressure closed container gradually decrease. At this time, the heating is stopped, the high-pressure sealed container is cooled and the residual heat is recovered at the same time, and then the lid of the high-pressure closed container is opened, and the separated dehydrated and dried inside is taken out. Biomass and solid inorganic impurities (this process is the discharge, that is, the dehydrated and dried biomass and solid inorganic impurities are separated inside), and the water content of the biomass after dehydration and drying is about 1%.
  • Step 5) input the high temperature and high pressure water vapor derived from the step 3) into the heat exchanger as the first heat exchange medium, and pass the second heat exchange medium having a low temperature to the heat exchanger, and use the high temperature generated in the step 3)
  • the heat of the high-pressure water vapor is completely exchanged for heat to the clean second heat exchange medium output, and at the same time, the heat exchange
  • the heat of the second heat exchange medium that is outputted is utilized to realize the recycling of energy required for dehydration and drying of the water-rich biomass.
  • step 1 the water-rich biomass is placed in a high-pressure closed container, and the process is also called feeding (putting in water-rich biomass); in step 4, after step 3), the lid of the high-pressure closed container is opened.
  • the internally separated dehydrated and dried biomass and solid inorganic impurities are taken out, and the process is discharging (ie, discharging the dehydrated and dried biomass and solid inorganic impurities which have been separated inside).
  • the feeding and discharging can be a continuous process, and the discharging can be carried out by setting the discharge port on the high-pressure closed container.
  • the heating method of performing the high-pressure sealed container is heating of the heat transfer oil medium.
  • it can be electric heating, high frequency, microwave, coal, oil, natural gas, solar energy, waste heat heating, or other heating methods.
  • Step 3) The dehydrated and dried biomass is sent to a heat-conducting oil boiler for combustion.
  • the heat of combustion is used for the heating process of the high-pressure closed container and its heat-conducting oil medium in steps 1) to 3).
  • the heat of the second heat exchange medium output in step 5) is used for heating system heating or other industrial and agricultural applications in power generation, municipal, industrial, agricultural, and military facilities.
  • the waste heat generated after the power generation system generates electricity is used for heating of the high pressure sealed container in step 1), heating of the heat transfer oil medium, and preheating of the second heat exchange medium.
  • the waste heat recovered by cooling the high pressure closed vessel can be used for heating the heat transfer oil medium, preheating the second heat exchange medium before entering the heat exchanger, and heating the water rich biomass.
  • the second heat exchange medium described in step 5) may be: clean water, gas, liquid metal or other substance capable of heat exchange.
  • the clean water can be desalinated water, deionized water or distilled water.
  • the temperature and pressure during the first-stage temperature rise can be performed within the following range according to the composition and treatment requirements of the water-rich biomass. Choose to achieve the best technical effect of separating biomass and solid inorganic impurities:
  • the temperature is 110 ° C ⁇ 200 ° C, the pressure is 0. 14MPa ⁇ l. 55MPa range.
  • the temperature is 120 ° C ⁇ 180 ° C, the pressure is 0. 20MPa ⁇ l. OOMPa range.
  • the temperature is 130 ° C, and the pressure is 0. 27 MPa.
  • the temperature is from 100 ° C to 350 ° C, and the pressure is in the range of 0.1 MPa to 16. 52 MPa.
  • the temperature is in the range of 0.2 MPa to 8. 58 MPa.
  • the temperature is from 150 ° C to 290 ° C, and the pressure is in the range of 0.4 MPa to 7. 44 MPa.
  • the water content of the water-rich biomass taken out after the high pressure closed cooling can be dehydrated and dried to the following level. To meet the needs of the actual processing.
  • the water content of the water-rich biomass after dehydration and drying reaches 0% ⁇ 50%
  • the water content of the water-rich biomass after dehydration and drying reaches 40%; 6.
  • the moisture content of the water-rich biomass after dehydration is 7%.
  • the moisture content of the water-rich biomass after dehydration is 1%.
  • Table 1 shows the energy consumption of the lkg water-rich biomass under the different operating parameters in the first-stage temperature rising process and the second-stage heating process in the embodiment, the biomass moisture content after dehydration, the energy consumption recovery, and the calorific value of biomass released after dehydration. Capacity situation.
  • Table 2 shows the energy recovery method of the energy in the recovered water-rich biomass realized by the present invention and the energy consumption capacity of the conventional sludge disposal method.
  • Net energy production calorific value of biomass released after dehydration - recovery value of energy consumption + energy consumption of water-rich biomass treatment.
  • Table 2 Comparison of energy recovery methods of energy in water-rich biomass* and traditional sludge disposal methods «Water biological treatment can contain kisses
  • Atmosphere and land biomass calorific value cannot be utilized.
  • biomass calorific value can not be used to produce a certain set, sludge has a good prognosis, but the equipment covers a large area, anaerobic digestion 320 0 360 40 sludge post-treatment 'biomass calorific value recovery rate low heat thousand 2 , 000 0 3000 1000 Drying is simple and complete, but the treatment energy consumption is separated, the net energy production value is low and the amount is completely reduced, but the treatment energy consumption ft, the net energy production value is low, and the direct Wei 2, 000 20 3000 1400
  • the method (first grade to ancestor to 180, complete reduction, net energy production, waste easy to handle, no need to exceed » set 15 minutes i second level overflow to 2, 300 100 3000 3000 rolling equipment, system
  • the water-rich biomass 80% water, 12% organic matter (24000KJ/Kg), 8% inorganic minerals.
  • Net energy production - Biomass release calorific value after dehydration - Water-rich biomass treatment energy consumption + energy consumption recovery value.
  • the energy required for the transportation and landfill process included in the direct landfill method is 100 yuan per ton, and 1 yuan per kWh. It can be seen from Table 2 that, by the method, the temperature and pressure are controlled at 180 ° C, l. OMPa, and allowed to stand for 15 minutes in the first temperature rising process; and the temperature and pressure are controlled at 26 (TC) in the second temperature rising process. , 5. 0MPa, and after 20 minutes, output high temperature and high pressure steam and recover its heat energy.
  • the ultra-high temperature and high pressure closed vessel of the device is used as a reactor, and the ultra-high temperature and high pressure reactor has a complicated structure and is very difficult to manufacture. Therefore, the investment cost of the equipment is extremely expensive, and it requires high temperature and high pressure and oxygen-rich operation, which consumes a large amount of energy and has a safety hazard. Higher. In addition, due to the complex composition of the sludge, it is generally corrosive, and it is more likely to cause damage to the UHT reactor under high temperature and high pressure conditions, thus resulting in expensive equipment maintenance and replacement costs. Ultra-high temperature and high pressure reactors are expensive to manufacture and difficult to operate.
  • the high temperature and high pressure sealed container with heating device used in this method does not have the same temperature and pressure conditions as the ultra high temperature and high pressure reactor. Therefore, compared with the ultra high temperature and high pressure reactor, the method uses heating.
  • the high temperature and high pressure closed container of the device is much easier to manufacture, the cost is greatly reduced, and the safety is greatly improved. And its operating cost is low, cost-effective, very practical.
  • step 2) described in the heat recovery method for recovering energy in the water-rich biomass can be used as follows: "--stage temperature rising process and step 3" "secondary temperature rising process” Combine into a one-time heating process, raise and control the temperature in the high-pressure closed container at 100 1 ⁇ 350 at one time, and control the pressure in the range of 0. lMPa ⁇ P ⁇ 16. 52MPa, simultaneously separate the solid inorganic impurities and enrich the water. Dehydration of matter.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • a second object of the present invention is to provide a system for recovering energy in a water-rich biomass, as shown in FIG. 2, the system 1 for recovering energy in a water-rich biomass, comprising a drying device 2, an ash disposal device 3,
  • the heat exchanger 4 is used as a heat collection and recovery device for high-temperature and high-pressure steam, a clean normal temperature water supply device 5, a waste water treatment device 6, and a steam turbine power generation system 7.
  • the drying device 2 is composed of a high pressure sealed container 21, an oil bath heating jacket 22 and a heat transfer oil boiler 23; the heat transfer oil boiler 23 is connected to the oil bath heating jacket 22; the high pressure sealed container 21 is placed in an oil bath for heating
  • the yoke 22 is mounted on the high-pressure airtight container 21 with a pressure gauge 211, a thermometer 212, and a steam output end 213, and the steam output end 213 is provided with a controllable steam outlet valve 214; Water-rich biomass into high pressure In a closed vessel, the water-rich biomass and the solid inorganic impurities are separated by a first-stage temperature-stabilizing process, and the high-temperature and high-pressure steam is outputted by the second-stage temperature to dehydrate the water-rich biomass into a water content.
  • the dried biomass is sent to the heat-conducting boiler 23 of the oil bath heating jacket for combustion; the ash disposal equipment 3 is connected with the heat-conducting oil boiler 23 for burning in the heat-conducting oil boiler Ash treatment; the first heat exchange medium input end 401 of the heat exchanger 4 is connected to the steam output end 213 of the high pressure closed container, and the high temperature and high pressure water vapor with impurities outputted from the high pressure closed container is used as the first heat exchange medium.
  • the second heat exchange medium in the present embodiment is a normal temperature desalinated water, and the second heat exchange medium input end 402 of the heat exchanger 4 is connected to the normal temperature desalted water supply device 5 as a second exchange.
  • the normal temperature desalted water of the heat medium is introduced into the heat exchanger through the second heat exchange medium input end 402 of the heat exchanger to exchange heat with the high temperature and high pressure water vapor as the first heat exchange medium; the second heat exchanger 4
  • the heat exchange medium output end 403 is connected to the power generation system 7 and the clean high temperature and high pressure second heat exchange medium steam generated during the heat exchange process is transported through the second heat exchange medium output end 403 of the heat exchanger.
  • the steam power generation system 7 generates electricity; the waste water output end 404 of the heat exchanger 4 is connected to the waste water treatment device 6, and during the heat exchange, the high temperature and high pressure water with impurities outputted from the steam output end 213 of the high pressure closed container
  • the steam is converted into waste water waste gas after heat exchange, and the waste water waste gas converted into high-temperature high-pressure steam with impurities is input into the waste water treatment device 6 via the waste gas exhaust gas output end 404; the steam turbine power generation system 7 and the drying device 2
  • the pipeline is connected to use the waste heat generated during power generation of the power generation system for the heating process of the high-pressure closed container to realize full recycling of energy.
  • the step 2) "the temperature rising process” and the step 3) "secondary temperature rising process” described in the heat recovery method for recovering energy in the water-rich biomass may be used.
  • the temperature is in the range of 0. lMPa ⁇ P ⁇ 16. 52MPa.
  • the temperature in the high-pressure closed container is raised at 100 1 ⁇ 350.
  • the heating device is composed of a heat-conducting oil heating device and a heat-conducting oil boiler for heating the high-pressure sealed container; the heat-conducting oil boiler is connected with the heat-conducting oil heating device pipeline; in practical applications, the high-pressure sealed container and the heat-conducting oil heating device can be designed And manufactured into an integrated device.
  • the clean second heat exchange medium vapor produced by the heat exchanger in this embodiment can also be delivered to heating system heating or other industrial and agricultural applications of municipal, industrial, agricultural, and military installations.
  • the heat recovery method for recovering energy in the water-rich biomass i.e., high temperature and high pressure (HTP) drying method
  • HTP high temperature and high pressure

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

La présente invention concerne un procédé et un système de recyclage thermique (1) pour l'énergie dans de la biomasse d'eau eutrophisée. Le procédé consiste à : mettre de la biomasse d'eau eutrophisée présentant une teneur en eau inférieure à 99,9 % dans un récipient étanche à l'air à haute pression (21); chauffer le récipient étanche à l'air à haute pression (21) à la température et à la pression comprises respectivement dans les plages 100 °C≤T＜250 °C et 0,1 MPa≤P＜3,97 MPa, maintenir telles quelles la température et la pression dans le récipient étanche à l'air à haute pression (21) et laisser reposer pendant une certaine période de temps, de façon à ce que la biomasse d'eau eutrophisée soit liquéfiée et que les diverses biomasses et impuretés inorganiques solides soient séparées; chauffer le récipient étanche à l'air à haute pression (21) à la température et à la pression comprises respectivement dans les plages 100 °C≤T＜350 °C et 0,1 MPa≤P＜16,52 MPa, de façon à ce que la plupart des composants de la biomasse ne subisse pas de décomposition chimique, et que dans le même temps, l'eau dans le récipient étanche à l'air à haute pression (21) bouille pour produire une vapeur haute pression et haute température, afin de recycler l'énergie et déshydrater la biomasse d'eau eutrophisée; et interrompre le chauffage, refroidir le récipient étanche à l'air à haute pression (21), recycler la chaleur résiduelle et évacuer les biomasses séchées et les impuretés inorganiques solides, les biomasses séchées étant utilisées pour le recyclage de l'énergie, et les impuretés inorganiques solides étant utilisées pour le recyclage substances minérales et de métaux lourds.
PCT/CN2013/088433 2012-12-03 2013-12-03 Procédé et système de recyclage thermique pour l'énergie dans de la biomasse d'eau eutrophisée WO2014086278A1 (fr)

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CN106310682A (zh) * 2015-06-23 2017-01-11 施丽菊 高温有机液体节能纯化系统
CN106630530A (zh) * 2015-10-30 2017-05-10 新大陆科技集团有限公司 一种反应釜及应用其的富水生物质干化及能量回收系统
CN105712603B (zh) * 2016-01-22 2018-06-01 惠州市中环科技环保工程有限公司 一种应用射频电磁能的污泥干化方法

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