CN111303958A - Preparation method of high-calorific-value biosolid fuel - Google Patents
Preparation method of high-calorific-value biosolid fuel Download PDFInfo
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- CN111303958A CN111303958A CN202010295208.6A CN202010295208A CN111303958A CN 111303958 A CN111303958 A CN 111303958A CN 202010295208 A CN202010295208 A CN 202010295208A CN 111303958 A CN111303958 A CN 111303958A
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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
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
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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
- 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
Abstract
The invention discloses a preparation method of high-calorific-value biosolid fuel, belonging to the technical field of urban organic waste treatment. The high-calorific-value biosolid fuel with structure and fuel characteristics similar to that of coal is formed by introducing high-concentration phenol-containing wastewater in the hydrothermal carbonization process of the municipal organic solid waste and utilizing dehydration, polycondensation and aromatization reaction between a carbonization intermediate product of the municipal organic solid waste and phenolic compounds in the phenol-containing wastewater. The invention improves the quality yield by more than 30 percent, improves the high calorific value by more than 20 percent, reduces the ash content by more than 26 percent, and respectively achieves the combustion stability index and the comprehensive combustion index of 11.7 multiplied by 104And 3.8X 10‑8And excellent combustion performance is shown.
Description
Technical Field
The invention belongs to the technical field of urban organic waste treatment, relates to a preparation method of high-calorific-value biosolid fuel, and particularly relates to a method for preparing high-calorific-value biosolid fuel by hydrothermal carbonization of municipal organic solid waste and high-concentration phenol-containing wastewater.
Background
The urban organic waste is a general name of solid organic waste which is generated in production, life, consumption and other activities of human beings and discharged to the environment, and mainly comprises domestic waste discharged in daily life, kitchen waste generated in catering industry, residual sludge generated in sewage treatment plants, livestock and poultry excrement waste generated in breeding industry and the like. Along with the rapid development of social economy, the continuous acceleration of urbanization process and the rapid improvement of the living standard of people in China, the yield of municipal solid waste, particularly organic waste, is rapidly increased, so that a large amount of soil is occupied, and because the organic matter content is rich, the water content is high, germs are easy to breed and stink is emitted, the environmental pollution problem caused by the municipal organic waste and the influence on public health are more obvious, the urban solid waste becomes a serious social public hazard in various countries in the world, and the urban solid waste is one of major environmental protection problems which are urgently needed to be solved in various countries and regions.
The urban organic solid waste is generally subjected to resource treatment modes such as land utilization, aerobic composting, incineration power generation and the like, and the main problem of the technologies in the practical utilization process is that the water content of the urban organic solid waste needs to be reduced to a certain degree, so that the overall treatment cost is high. The hydrothermal carbonization technology is developed in the early stage of the 20 th century, and can convert high-water-content urban organic solid waste into a solid carbon material with a higher calorific value through chemical reactions such as dehydration, decarboxylation, condensation and the like under relatively mild conditions. However, due to the inherent high ash characteristic of municipal organic solid waste, carbon materials prepared by direct hydrothermal carbonization also contain high ash and contain much lower aromatic structures than coal, resulting in poor fuel characteristics in energy utilization.
The phenolic wastewater refers to organic wastewater generated in the industrial production processes of coking, oil refining, paper making, plastics, ceramics, textiles and the like. Since phenolic substances are the prototype toxicants, they have been blacklisted as being the preferred pollutant control by the U.S. national environmental protection agency. The treatment of phenol-containing wastewater is also a great problem in the field of domestic and foreign sewage treatment. Phenol-containing waste water of more than 1000mg/L is generally referred to as high-concentration phenol-containing waste water in terms of the concentration of phenolic compounds in the phenol-containing waste water.
Disclosure of Invention
The invention aims to provide a preparation method of high-calorific-value biosolid fuel, which is characterized in that high-concentration phenolic wastewater is introduced in the hydrothermal carbonization process of municipal organic solid waste, and dehydration, polycondensation and aromatization reactions are carried out between carbonized intermediate products of the municipal organic solid waste and phenolic compounds in the phenolic wastewater, so that the high-calorific-value biosolid fuel with the structure and fuel characteristics similar to coal is formed.
The specific technical scheme is as follows:
a preparation method of high-calorific-value biosolid fuel comprises the following steps:
step 1, high-concentration phenolic wastewater and urban organic solid waste exchange heat with high-temperature circulating liquid flow from a heat exchanger in a preheating treatment unit respectively to realize energy recovery;
step 2, mixing the preheated high-concentration phenol-containing wastewater and the urban organic solid waste in a high-temperature high-pressure reaction kettle according to a certain dry ash-free base ratio (1:30-1:2), heating the mixture to 170-300 ℃ for reaction for 1-10 hours after uniform mixing, and realizing co-hydrothermal carbonization;
step 3, after hydrothermal carbonization, introducing cooling water into a heat exchanger outside the high-temperature high-pressure reaction kettle to realize temperature reduction of the reaction kettle and simultaneously form a high-temperature circulating liquid flow;
step 4, opening a pressure relief valve to relieve pressure when the temperature of the high-temperature high-pressure reaction kettle is reduced to about 60-80 ℃, and then transferring the carbon-water mixed solution to a high-speed centrifuge for solid-liquid separation;
and 5, transferring the centrifuged solid product (with the water content of 30-50%) to a drying and molding integrated machine, and preparing the high-calorific-value biological solid fuel into a rod or granular shape.
And 6, purifying the centrifuged liquid product in a biological purification treatment unit, and discharging the purified water serving as a carrier for exchanging heat energy of the heat exchanger or reaching the standard.
Further, in the step 1, the municipal organic solid waste comprises organic waste such as organic waste generated in resident life, kitchen waste generated in catering industry, excess sludge generated in sewage treatment plants, livestock and poultry manure waste generated in breeding industry and the like;
the high-concentration phenolic wastewater is high-concentration phenolic wastewater generated in industrial production processes of petrochemical plants, coal chemical plants, synthetic fiber plants, resin plants, pharmaceutical factories and the like.
Further, in step 2, mixing was performed in accordance with dry ashless 1/4 and a solid content of 85%, followed by reaction at 200 ℃ for 6 hours.
The initial solid content of the municipal organic solid waste can be adjusted by consuming the prepared biosolid fuel so that the solid content of the mixed high-concentration phenolic wastewater and municipal organic solid waste is maintained between 70 and 90 percent. When the phenol-containing wastewater contains a large amount of phenol compounds with substituent groups, such as cresol, phloroglucinol, nitrophenol and the like, the formed biosolid fuel has higher calorific value and lower ash content, and the energy quality of the biosolid fuel is similar to that of bituminous coal. The produced biosolid fuel has extremely low sulfur, chlorine and nitrogen contents, and belongs to clean solid fuels.
Compared with the prior art, the invention has the beneficial effects that:
compared with the biosolid fuel prepared by single hydrothermal carbonization and reformation of the municipal organic solid waste, the biosolid fuel with high calorific value prepared by hydrothermal carbonization of the municipal organic solid waste and high-concentration phenol-containing wastewater has the advantages that the mass yield is improved by more than 30 percent, the high calorific value is improved by more than 20 percent, the ash content is reduced by more than 26 percent, and the combustion stability index and the comprehensive combustion index respectively reach 11.7 multiplied by 104And 3.8X 10-8The element composition and the physical and chemical properties of the bituminous coal are far superior to those of lignite and similar to those of bituminous coal, and the bituminous coal has excellent combustion performance.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to examples.
Example 1
A preparation method of high-calorific-value biosolid fuel comprises the following steps:
step 1, high-concentration phenolic wastewater and urban organic solid waste exchange heat with high-temperature circulating liquid flow from a heat exchanger in a preheating treatment unit respectively to realize energy recovery;
step 2, mixing the preheated high-concentration phenol-containing wastewater and the urban organic solid waste in a high-temperature high-pressure reaction kettle according to a certain dry ash-free base ratio (1:2), heating the mixture to 300 ℃ for reaction for 1 hour after uniform mixing, and realizing hydrothermal carbonization;
step 3, after hydrothermal carbonization, introducing cooling water into a heat exchanger outside the high-temperature high-pressure reaction kettle to realize temperature reduction of the reaction kettle and simultaneously form a high-temperature circulating liquid flow;
step 4, opening a pressure relief valve to relieve pressure when the temperature of the high-temperature high-pressure reaction kettle is reduced to about 80 ℃, and then transferring the carbon-water mixed solution to a high-speed centrifuge for solid-liquid separation;
and 5, transferring the centrifuged solid product (with the water content of 30%) to a drying and molding integrated machine, and preparing the high-calorific-value biological solid fuel into a rod or a particle.
And 6, purifying the centrifuged liquid product in a biological purification treatment unit, and discharging the purified water serving as a carrier for exchanging heat energy of the heat exchanger or reaching the standard.
In the step 1, the urban organic solid waste comprises organic waste such as organic waste generated in resident life, kitchen waste generated in catering industry, excess sludge generated in sewage treatment plants, livestock and poultry manure waste generated in breeding industry and the like;
the high-concentration phenolic wastewater is high-concentration phenolic wastewater generated in industrial production processes of petrochemical plants, coal chemical plants, synthetic fiber plants, resin plants, pharmaceutical factories and the like.
Example 2
A preparation method of high-calorific-value biosolid fuel comprises the following steps:
step 1, high-concentration phenolic wastewater and urban organic solid waste exchange heat with high-temperature circulating liquid flow from a heat exchanger in a preheating treatment unit respectively to realize energy recovery;
step 2, mixing the preheated high-concentration phenol-containing wastewater and the urban organic solid waste in a high-temperature high-pressure reaction kettle according to a certain dry ash-free base ratio of 1:30, heating the mixture to 170 ℃ for reaction for 10 hours after uniform mixing, and realizing hydrothermal carbonization;
step 3, after hydrothermal carbonization, introducing cooling water into a heat exchanger outside the high-temperature high-pressure reaction kettle to realize temperature reduction of the reaction kettle and simultaneously form a high-temperature circulating liquid flow;
step 4, opening a pressure relief valve to relieve pressure when the temperature of the high-temperature high-pressure reaction kettle is reduced to about 60 ℃, and then transferring the carbon-water mixed solution to a high-speed centrifuge for solid-liquid separation;
and 5, transferring the centrifuged solid product (with the water content of 50%) to a drying and molding integrated machine, and preparing the high-calorific-value biological solid fuel into a rod or a particle.
And 6, purifying the centrifuged liquid product in a biological purification treatment unit, and discharging the purified water serving as a carrier for exchanging heat energy of the heat exchanger or reaching the standard.
In the step 1, the urban organic solid waste comprises organic waste such as organic waste generated in resident life, kitchen waste generated in catering industry, excess sludge generated in sewage treatment plants, livestock and poultry manure waste generated in breeding industry and the like;
the high-concentration phenolic wastewater is high-concentration phenolic wastewater generated in industrial production processes of petrochemical plants, coal chemical plants, synthetic fiber plants, resin plants, pharmaceutical factories and the like.
Example 3
The preheated high-concentration phenol-containing wastewater and the municipal organic solid waste are mixed according to dry ashless 1/4 and the solid content of 85 percent, then the mixture reacts for 6 hours at 200 ℃, the yield of the biosolid fuel obtained after centrifugation reaches 78 percent, the heat value reaches 19MJ/Kg, the ash content reaches 28 percent, compared with the single hydrothermal carbonization of the municipal organic solid waste, the yield and the heat value are respectively improved by 14 percent and 7 percent, and the ash content is reduced by 16 percent. The energy quality of the biosolid fuel can be obviously improved by further optimizing the process parameters, for example, the adding ratio of the phenol-containing wastewater is increased to 1/2, the solid content of the mixed solution is 70%, the hydrothermal carbonization temperature is 260 ℃, the retention time is 10 hours, the yield and the heat value of the biosolid fuel can be further respectively increased by 36% and 24%, and the ash content is reduced by 31%.
The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and any simple modifications or equivalent substitutions of the technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present invention are within the scope of the present invention.
Claims (3)
1. The preparation method of the high-calorific-value biosolid fuel is characterized by comprising the following steps of:
step 1, high-concentration phenolic wastewater and urban organic solid waste exchange heat with high-temperature circulating liquid flow from a heat exchanger in a preheating treatment unit respectively to realize energy recovery;
step 2, mixing the preheated high-concentration phenol-containing wastewater and the municipal organic solid waste in a high-temperature high-pressure reaction kettle according to a dry ash-free base ratio of 1:30-1:2, heating the mixture to 170-300 ℃ for reaction for 1-10 hours after uniform mixing, and realizing co-hydrothermal carbonization;
step 3, after hydrothermal carbonization, introducing cooling water into a heat exchanger outside the high-temperature high-pressure reaction kettle to realize temperature reduction of the reaction kettle and simultaneously form a high-temperature circulating liquid flow;
step 4, opening a pressure relief valve to relieve pressure when the temperature of the high-temperature high-pressure reaction kettle is reduced to 60-80 ℃, and then transferring the carbon-water mixed solution to a high-speed centrifuge for solid-liquid separation;
step 5, transferring the centrifuged solid product with the water content of 30-50% into a drying and molding integrated machine to prepare the rodlike or granular high-calorific-value biosolid fuel;
and 6, purifying the centrifuged liquid product in a biological purification treatment unit, and discharging the purified water serving as a carrier for exchanging heat energy of the heat exchanger or reaching the standard.
2. The method for preparing high calorific value biosolid fuel according to claim 1, wherein in step 1, the municipal organic solid waste comprises organic waste produced by residential life, kitchen waste produced by catering industry, excess sludge produced by sewage treatment plants and organic waste of livestock manure waste produced by aquaculture industry;
the high-concentration phenolic wastewater is high-concentration phenolic wastewater generated in industrial production processes of petrochemical plants, coal chemical plants, synthetic fiber plants, resin plants and pharmaceutical plants.
3. The method for producing a high calorific value biosolid fuel of claim 1, wherein in step 2, the dry ashless 1/4 is mixed with a solids content of 85% and then reacted at 200 ℃ for 6 hours.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013083772A1 (en) * | 2011-12-09 | 2013-06-13 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Method for the pretreatment of process wastewater originating from hydrothermal carbonization processes |
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| CN109292894A (en) * | 2018-10-25 | 2019-02-01 | 南京工程学院 | Phenol wastewater combines the method that biomass preparation hydro-thermal coke realizes hydro-thermal coke deliming self-activation |
| CN110257575A (en) * | 2019-06-27 | 2019-09-20 | 北京科技大学 | It is a kind of that technique of the carbide for pulverized coal injection is prepared based on hydro-thermal reaction processing agriculture and forestry organic waste material |
| CN110982542A (en) * | 2019-11-12 | 2020-04-10 | 北京科技大学 | Method for preparing blast furnace blowing semicoke from low-rank coal based on hydrothermal reaction |
-
2020
- 2020-04-15 CN CN202010295208.6A patent/CN111303958A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013083772A1 (en) * | 2011-12-09 | 2013-06-13 | L'Air Liquide, Société Anonyme pour l'Etude et l'Exploitation des Procédés Georges Claude | Method for the pretreatment of process wastewater originating from hydrothermal carbonization processes |
| CN106865945A (en) * | 2017-03-10 | 2017-06-20 | 北京顺鸿金建环境科技发展有限公司 | A kind of equipment for sludge carbonization technique |
| CN109292894A (en) * | 2018-10-25 | 2019-02-01 | 南京工程学院 | Phenol wastewater combines the method that biomass preparation hydro-thermal coke realizes hydro-thermal coke deliming self-activation |
| CN110257575A (en) * | 2019-06-27 | 2019-09-20 | 北京科技大学 | It is a kind of that technique of the carbide for pulverized coal injection is prepared based on hydro-thermal reaction processing agriculture and forestry organic waste material |
| CN110982542A (en) * | 2019-11-12 | 2020-04-10 | 北京科技大学 | Method for preparing blast furnace blowing semicoke from low-rank coal based on hydrothermal reaction |
Non-Patent Citations (1)
| Title |
|---|
| LIPING WANG等: "Hydrothermal co-carbonization of sewage sludge and high concentration phenolic wastewater for production of solid biofuel with increased calorific value", 《JOURNAL OF CLEANER PRODUCTION》 * |
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Application publication date: 20200619 |