CN110981141A - Method for dehydrating sludge drying and burning coupled pyrolysis poly-generation - Google Patents
Method for dehydrating sludge drying and burning coupled pyrolysis poly-generation 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
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
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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
- C02F11/12—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
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
- C10G1/02—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal by distillation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
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Abstract
The invention relates to a method for dehydrating sludge drying and incinerating coupled pyrolysis poly-generation, which comprises the following steps: 1) establishing a simulation model of the sludge drying incineration coupled pyrolysis poly-generation process by utilizing process simulation software Aspen Plus; 2) inputting the mass ratio R of the pyrolysis sludge to the total dry sludge to realize the self-sufficiency of system energy; 3) varying R, maximum yield of product was obtained. According to the invention, the optimal process parameter R is obtained from the aspects of energy balance and economic benefit for guiding the actual operation, and a reference is provided for the operation implementation of the sludge drying and incineration coupled pyrolysis poly-generation process, so that the sludge treatment achieves reduction, stabilization and recycling, and the method has good environmental value and realizes the maximization of economic benefit.
Description
Technical Field
The invention relates to a method for dehydrating sludge drying and incineration coupled pyrolysis poly-generation, in particular to a treatment method for realizing reduction, recycling and economic benefit maximization of waste sludge through a sludge drying and incineration coupled pyrolysis poly-generation process model.
Background
With the rapid development of municipal sewage treatment, the content of sludge which is a byproduct of sewage treatment is also increased rapidly, and the sludge treatment is more and more paid more attention by people. With the further improvement of environmental regulations, the reduction, stabilization and recycling technologies of sludge will become the inevitable trend of the development. The heat value of the sludge is usually between 10 and 20 MJ/kg, and the utilization of the heat value has achieved good effect in some countries.
The Chinese patent specification CN201711438671.6 discloses an oil-containing sludge pyrolysis-combustion coupling double-bed integrated treatment process system, the new process combines the advantages of pyrolysis and incineration, the pyrolysis oil can be efficiently recovered through the pyrolysis process, the pyrolyzed oil sludge coke can be conveyed to a dense-phase region of a combustion furnace through a return feeder to be combusted, the generated flue gas provides heat required by sludge drying and pyrolysis, the oil sludge coke is changed into valuable, the energy utilization rate is high, and efficient combustion is realized, so that the aims of recycling and volume reduction treatment of sludge are achieved.
However, when the oil-containing sludge pyrolysis-combustion coupled double-bed integrated treatment process system is adopted, energy self-sufficiency can be realized only by recovering pyrolysis oil as a product and combusting oil sludge carbon as pyrolysis waste. Different thermal conversion resource utilization processes of the dewatered sludge mainly comprise three types of pyrolysis oil preparation, pyrolysis carbon preparation and oil/carbon co-production. If oil/carbon co-production is realized, the process can only add other types of fuel for combustion, and the energy balance of the system is realized by using flue gas cooling heat supply, so that the process is not economical from the energy saving perspective.
The dried sludge has a high heat value and is easy to burn out, and stable combustion can be maintained without auxiliary fuel.
Disclosure of Invention
The invention aims to provide a method for drying, incinerating, coupling, pyrolyzing and poly-generation of dewatered sludge, which realizes the maximization of yield on the premise of ensuring the self-sufficiency of system energy so as to obtain the maximum economic benefit.
The invention provides a method for dehydrating sludge drying and incinerating coupled pyrolysis poly-generation, which specifically comprises the following steps: 1) establishing a simulation model of the sludge drying incineration coupled pyrolysis poly-generation process by utilizing process simulation software Aspen Plus; 2) inputting the mass ratio R of the pyrolysis sludge to the total dry sludge to realize the self-sufficiency of system energy; 3) varying R, maximum yield of product was obtained.
The method for dehydrating sludge drying and incinerating coupled pyrolysis poly-generation further comprises the following optimization scheme:
1) a process simulation model of sludge drying and incineration coupled pyrolysis poly-generation is established by utilizing Aspen Plus software, and the process simulation model mainly comprises 5 processes of drying, pyrolysis, combustion, product separation and flue gas cooling and heat supply.
2) After the dry sludge is shunted by the model, one part of the dry sludge is sent into the pyrolysis furnace to carry out pyrolysis reaction to generate pyrolysis gas and coke, the other part of the dry sludge is used as fuel to be combusted, and the mass ratio of the pyrolysis sludge to the total dry sludge is R.
3) The model utilizes the heat released by cooling the flue gas generated by burning the dried sludge to respectively supply heat to the sludge drying process and the pyrolysis process so as to realize the self-sufficiency of system energy without adding other types of fuels.
4) The high-temperature flue gas of the model preferentially supplies heat to the pyrolysis furnace, the flue gas after primary cooling supplies heat to the dryer, and the temperature of tail gas is higher than the drying temperature.
5) The model separates the products after the pyrolysis of the dry sludge, and the pyrolysis gas enters the condenser for condensation to obtain pyrolysis oil, thereby realizing the co-production of oil/carbon.
6) The model solves the process parameter R when the yield of each product is the highest by changing the proportion R of the pyrolysis sludge to the total dry sludge.
The present invention may further comprise:
1. the sludge drying and burning coupled pyrolysis poly-generation model feeds coke into a combustor to be co-mixed and burned with dry sludge, so that the sludge drying and burning coupled pyrolysis oil production model can be obtained.
2. The sludge drying incineration coupled pyrolysis poly-generation model feeds pyrolysis oil into a combustor to be mixed and combusted with dry sludge, and the sludge drying incineration coupled pyrolysis charcoal making model can be obtained.
The invention has the beneficial effects that:
1) the invention provides a method for drying incineration coupled pyrolysis poly-generation of dehydrated sludge, which is characterized in that an Aspen Plus software is utilized to establish a sludge drying incineration coupled pyrolysis poly-generation model, part of dried sludge is sent to a combustor to be combusted, heat released by cooling of generated high-temperature flue gas through a heat exchanger is sent to a pyrolysis furnace, and heat required by pyrolysis reaction is provided for the other part of dried sludge. The heat released by the primary cooled flue gas through the cooling of the heat exchanger enters a sludge dryer, the dewatered sludge with the water content of 60% is dried into dried sludge with the water content of 10%, the heat value of the sludge is higher at this moment, the dried sludge is shunted and then is sent into a burner according to a certain proportion to maintain stable combustion, and the heat released by combustion is continuously used for the pyrolysis reaction of the dried sludge and the drying process of the dewatered sludge, so that an energy conversion process is completed. The heat required by sludge drying and pyrolysis is provided by the system, and the heat balance of the system can be maintained without additional energy, so that the effect of saving energy is achieved, and certain economic benefit is obtained.
2) The invention combines the advantages of the two processes of pyrolysis and combustion, can treat partial dry sludge through the combustion process, can greatly reduce the volume and the weight of the sludge, has high treatment speed, and ensures that the sludge treatment achieves reduction and stabilization; the pyrolysis oil and the coke can be efficiently recovered through the pyrolysis process, the characteristic of high sludge recycling value is effectively utilized, and the sludge is recycled, so that the method has good environmental value and high economic benefit.
3) According to the invention, by changing the mass ratio R of the pyrolysis sludge to the total dry sludge, on the premise of realizing system energy balance, the process parameter R when the yield of pyrolysis oil and coke is highest in the sludge drying incineration coupled pyrolysis poly-generation model is 0.5, and the total economic benefit is calculated according to the product yield and the market price to be improved by 6.48%, so that the economic benefit maximization is realized, and a reference is provided for the operation implementation of the sludge drying incineration coupled pyrolysis poly-generation process.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of the present invention.
FIG. 2 is a graph showing the variation of the heat absorption and release quantities with R in the dewatered sludge drying and incineration coupled pyrolysis poly-generation process described in example 1 of the present invention.
FIG. 3 is a graph showing the variation of the heat absorption and release quantities with R in the dewatered sludge drying and incineration coupled pyrolysis oil production process described in embodiment 2 of the present invention.
FIG. 4 is a graph showing the variation of the heat absorption and release quantities with R in the dewatered sludge drying and incineration coupled pyrolysis carbon production process described in embodiment 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
FIG. 1 is a process flow diagram of the invention, the process mainly comprises 5 processes of 1) drying, 2) pyrolysis, 3) combustion, 4) product separation and 5) flue gas cooling and heat supply, and a process plant comprises components such as a dryer, a flash evaporator, a flow divider, a pyrolysis furnace, a separator, a condenser, a combustor, a heat exchanger (2), and stream modules of various components such as a feed stream, a discharge stream and a connecting stream.
The dry sludge is divided by the divider according to the proportion R of the pyrolysis sludge to the total dry sludge, the dry sludge with the mass ratio of (1-R) is sent into the combustor to be used as fuel for combustion, the generated high-temperature flue gas is cooled by the first stage of the heat exchanger to release heat, the heat is preferentially supplied to the pyrolysis furnace, and the dry sludge with the mass ratio of R is pyrolyzed to generate pyrolysis gas and coke. And separating the product by a separator, and condensing pyrolysis gas in a condenser to obtain pyrolysis oil, wherein the process realizes oil/carbon co-production. And after the flue gas after primary cooling is subjected to secondary cooling by the heat exchanger, the released heat supplies heat to the dryer, the flash evaporator separates dried sludge and water vapor, and the dried sludge enters the flow divider to realize circulation. The system is self-sufficient in energy in the process, and other types of fuel do not need to be added. The model feeds coke into a combustor to be co-mixed and combusted with dry sludge, so that the sludge drying and incinerating coupled pyrolysis oil preparation model can be obtained. The model feeds pyrolysis oil into a combustor to be mixed and combusted with dry sludge, so that the sludge drying and incinerating coupled pyrolysis charcoal making model can be obtained.
Example 1
The sludge drying and burning coupled pyrolysis poly-generation model mainly simulates 5 processes of dehydration sludge drying, pyrolysis, combustion, product separation and flue gas cooling and heat exchange. Setting the initial water content of the sludge to be 60 percent, the treatment capacity to be 1000kg/h and the sludge drying temperature to be 105oC. The pyrolysis reaction temperature is 500oAnd C, taking 20% of heat exchange loss of the system. In the drying process, the water content of the sludge is reduced to 10% by using heat released by cooling the flue gas, and the dried sludge is separated from water vapor by a flash evaporator to obtain 444kg/h of total dried sludge. The flow divider divides the dry sludge according to the proportion R of the pyrolysis sludge to the total dry sludge, one part of the dry sludge is sent into the pyrolysis furnace for reaction, and the other part of the dry sludge is used as fuel for combustion. And separating the product of the dried sludge after pyrolysis by using a separator, and condensing pyrolysis gas in a condenser to obtain pyrolysis oil. As shown in figure 2, the sludge drying incineration coupled pyrolysis poly-generation process takes pyrolysis oil and coke as main products, and obtains the pyrolysis heat absorption amount of 253.8kW, the primary flue gas cooling heat release amount of 302.6kW, the drying heat absorption amount of 422.1kW, the secondary flue gas cooling heat release amount of 504.6kW and the tail gas temperature of 140 kW on the premise of realizing the system energy balance by changing the proportion R of the pyrolysis sludge to the total dry sludge and obtaining the process parameter R of 0.5oC, the yield of each product is the highest, the pyrolysis oil is 99kg/h, and the coke is 86 kg/h.The price of the pyrolysis oil is calculated according to the heat value, 0.3675$ kg is obtained, the price of the coke is 0.02$ kg, the product yield reaches 38.1$ wet sludge, the yields of the pyrolysis oil and the coke are respectively improved by 6.45 percent and 7.5 percent, and the total economic benefit is improved by 6.48 percent.
Example 2
As shown in fig. 3, the sludge drying incineration coupled pyrolysis oil production process takes pyrolysis oil as a main product, coke produced by pyrolysis is mixed and combusted with dry sludge, and other parts are the same as those in example 1. When the technological parameter R is 0.6, the pyrolysis heat absorption capacity is 304.6kW, the first-stage cooling heat release capacity of the flue gas is 365.3kW, the drying heat absorption capacity is 422.1kW, the second-stage cooling heat release capacity of the flue gas is 508.7kW, and the tail gas temperature is 115 kWoC, the yield of the product is the highest, 119kg/h of pyrolysis oil is obtained, the yield of the product reaches 43.73$/t of wet sludge, and the yield and the economic benefit of the pyrolysis oil are both improved by 12.26%.
Example 3
As shown in FIG. 4, the sludge drying incineration coupled pyrolysis charcoal making process takes coke as a main product, pyrolysis oil and dry sludge are mixed and combusted, and the pyrolysis reaction temperature is set to 300oC, the other portions are the same as in example 1. When the technological parameter R is 1, the pyrolysis heat absorption capacity is 419.1kW, the first-stage cooling heat release capacity of the flue gas is 502.5kW, the drying heat absorption capacity is 422.1kW, the second-stage cooling heat release capacity of the flue gas is 503.7kW, and the tail gas temperature 741 are obtainedoC, the yield of the product is the highest, 288kg/h of coke is obtained, the product yield reaches 5.78$/t of wet sludge, and the yield and the economic benefit of the coke are both improved by 65.52%.
Descriptions not related to the embodiments of the present invention are well known in the art, and may be implemented by referring to the well-known techniques. The invention obtains satisfactory trial effect through repeated operation verification. The above embodiments and examples are specific supports for the technical idea of the method for drying and incinerating dewatered sludge coupled with pyrolysis poly-generation provided by the present invention, and the protection scope of the present invention cannot be limited thereby, and any equivalent changes or equivalent changes made on the basis of the technical scheme according to the technical idea provided by the present invention still belong to the protection scope of the technical scheme of the present invention.
Claims (9)
1. A method for dehydrating sludge drying and incinerating coupled pyrolysis poly-generation is characterized by comprising the following steps:
1) establishing a simulation model of the sludge drying incineration coupled pyrolysis poly-generation process by utilizing process simulation software Aspen Plus;
2) inputting the mass ratio R of the pyrolysis sludge to the total dry sludge to realize the self-sufficiency of system energy;
3) varying R, maximum yield of product was obtained.
2. The method for drying incineration coupled pyrolysis poly-generation of dehydrated sludge according to claim 1, characterized in that: a process simulation model of sludge drying and incineration coupled pyrolysis poly-generation is established by utilizing Aspen Plus software, and the process simulation model mainly comprises 5 processes of drying, pyrolysis, combustion, product separation and flue gas cooling and heat supply.
3. The method for drying incineration coupled pyrolysis poly-generation of dehydrated sludge according to claim 2, characterized in that: after the dry sludge is shunted by the model, one part of the dry sludge is sent into the pyrolysis furnace to carry out pyrolysis reaction to generate pyrolysis gas and coke, the other part of the dry sludge is used as fuel to be combusted, and the mass ratio of the pyrolysis sludge to the total dry sludge is R.
4. The method for drying incineration coupled pyrolysis poly-generation of dehydrated sludge according to claim 2, characterized in that: the model utilizes the heat released by cooling the flue gas generated by burning the dried sludge to respectively supply heat to the sludge drying process and the pyrolysis process so as to realize the self-sufficiency of system energy without adding other types of fuels.
5. The method for drying incineration coupled pyrolysis poly-generation of dehydrated sludge according to claim 2, characterized in that: the high-temperature flue gas of the model preferentially supplies heat to the pyrolysis furnace, the flue gas after primary cooling supplies heat to the dryer, and the temperature of tail gas is higher than the drying temperature.
6. The method for drying incineration coupled pyrolysis poly-generation of dehydrated sludge according to claim 2, characterized in that: the model separates the products after the pyrolysis of the dry sludge, and the pyrolysis gas enters the condenser for condensation to obtain pyrolysis oil, thereby realizing the co-production of oil/carbon.
7. The method for drying incineration coupled pyrolysis poly-generation of dehydrated sludge according to claim 1, characterized in that: the model solves the process parameter R when the yield of each product is the highest by changing the proportion R of the pyrolysis sludge to the total dry sludge.
8. The method for drying incineration coupled pyrolysis poly-generation of dehydrated sludge according to claim 1, characterized in that: the model feeds coke into a combustor to be co-mixed and combusted with dry sludge, so as to obtain the sludge drying and incinerating coupled pyrolysis oil production model.
9. The method for drying incineration coupled pyrolysis poly-generation of dehydrated sludge according to claim 1, characterized in that: the model feeds pyrolysis oil into a combustor to be mixed and combusted with dry sludge, and the sludge drying and incineration coupled pyrolysis charcoal making model is obtained.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113686919A (en) * | 2021-09-14 | 2021-11-23 | 北京工业大学 | Method for detecting calorific value of enameled wire pyrolysis gas product |
CN114621794A (en) * | 2022-05-16 | 2022-06-14 | 烟台尚美丽家新能源有限公司 | Multifunctional coupling intelligent combined supply production system and method for biomass gasification furnace |
CN114956503A (en) * | 2022-06-09 | 2022-08-30 | 山东金孚环境工程有限公司 | Sludge pyrolysis treatment system capable of realizing self-sustaining of heat |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113686919A (en) * | 2021-09-14 | 2021-11-23 | 北京工业大学 | Method for detecting calorific value of enameled wire pyrolysis gas product |
CN113686919B (en) * | 2021-09-14 | 2023-11-24 | 北京工业大学 | Method for detecting calorific value of pyrolysis gas product of enameled wire |
CN114621794A (en) * | 2022-05-16 | 2022-06-14 | 烟台尚美丽家新能源有限公司 | Multifunctional coupling intelligent combined supply production system and method for biomass gasification furnace |
CN114621794B (en) * | 2022-05-16 | 2022-08-19 | 烟台尚美丽家新能源有限公司 | Multifunctional coupling intelligent combined supply production system and method for biomass gasification furnace |
CN114956503A (en) * | 2022-06-09 | 2022-08-30 | 山东金孚环境工程有限公司 | Sludge pyrolysis treatment system capable of realizing self-sustaining of heat |
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