CN111589839A - Paper-making garbage resourceful treatment method - Google Patents
Paper-making garbage resourceful treatment method Download PDFInfo
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- CN111589839A CN111589839A CN202010449120.5A CN202010449120A CN111589839A CN 111589839 A CN111589839 A CN 111589839A CN 202010449120 A CN202010449120 A CN 202010449120A CN 111589839 A CN111589839 A CN 111589839A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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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
- 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
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
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Abstract
The invention discloses a paper-making garbage recycling treatment method, and belongs to the technical field of garbage treatment. Comprises the following steps; step one, performing multistage crushing, sorting, drying and magnetic separation on pretreated paper-making garbage, and crushing the paper-making garbage to floc with the particle size of less than or equal to 15mm multiplied by 20 mm; step two, adding an additive into the papermaking waste wadding material obtained in the step one, and uniformly stirring; thirdly, making the papermaking waste wadding material obtained in the second step into derived fuel through an RDF forming machine under high pressure; step four, cooling and screening the formed derivative fuel obtained in the step three; and fifthly, pyrolyzing and gasifying the formed derived fuel obtained in the fourth step at high temperature to generate mixed combustible gas. Aiming at the technical problems of non-environmental protection and low energy utilization rate of the garbage disposal method in the prior art, the method is an effective method for disposing the paper-making garbage, which is efficient, green and environment-friendly and realizes garbage energy.
Description
Technical Field
The invention relates to the technical field of garbage treatment, in particular to a paper-making garbage recycling treatment method.
Background
The paper industry has gradually expanded the scale with the development of science and technology, but simultaneously has produced a large amount of solid waste. If the solid waste in the paper making industry cannot be properly treated, not only the ecological environment is influenced, but also the resources are wasted. With the increase of social demands, the yield of solid wastes in the paper industry is increasing, so that the recycling and reduction treatment of the solid wastes is necessary.
At present, the treatment methods of the paper-making garbage in China mainly comprise methods of landfill treatment, incineration treatment, recovery and the like. But these methods can cause serious harm to the environment and life. The main components of the paper-making garbage are plastic, sludge, iron wires and sand, wherein the plastic belongs to non-degradable substances and can not be completely degraded after being buried underground for hundreds of years; the sludge contains a large amount of germs and toxic substances, potential safety hazards can be caused by landfill without treatment, and meanwhile, the environment, soil and the living environment of water bodies are seriously damaged and polluted; the incineration has serious secondary pollution and can directly or indirectly endanger the life health and living environment; the classified recovery can realize the recovery and utilization of the plastic part of the paper-making waste theoretically, but the components of the plastic in the paper-making waste are complex, plastic films made of PE, PP, PVC and other materials are contained in the plastic films, the types, specifications and thicknesses of the plastic films are different, and the types of the plastic films are difficult to separate mechanically and manually. Therefore, the above method cannot achieve a satisfactory treatment of energy from paper mill waste.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the technical problems of environmental pollution and low energy utilization rate of the garbage treatment method in the prior art, the invention provides a paper-making garbage recycling treatment method, which is a high-efficiency, environment-friendly and garbage recycling treatment method.
2. Technical scheme
In order to solve the problems, the technical scheme provided by the invention is as follows:
a paper-making garbage resource treatment method comprises the following steps:
step one, performing multistage crushing, sorting, drying and magnetic separation on pretreated paper-making garbage, and crushing the paper-making garbage to floc with the particle size of less than or equal to 15mm multiplied by 20 mm;
step two, adding an additive into the papermaking waste wadding material obtained in the step one, and uniformly stirring;
thirdly, making the papermaking waste wadding material obtained in the second step into derived fuel through an RDF forming machine under high pressure;
step four, cooling and screening the formed derivative fuel obtained in the step three;
and fifthly, pyrolyzing and gasifying the formed derived fuel obtained in the fourth step at high temperature to generate mixed combustible gas.
The pretreatment of the paper-making garbage in the first step utilizes an MBT mechanical sorting technology, the paper-making garbage in the material pit is cleaned day to day, the garbage is treated within 10 hours, and secondary pollution to the environment is reduced. The components (such as plastics, paper, wood and the like) with high combustion value in the paper-making garbage are separated by utilizing separation and screening equipment, so that the combustible gas with high heat value is ensured to be produced. Through the steps, the paper-making garbage is prepared into the mixed combustible gas by utilizing the high-temperature pyrolysis gasification process of the paper-making garbage. The finally obtained mixed gas contains the biogas consisting of gas components such as H2, C0, CH4, CnHm and the like, and has wide industrial application range and high economic value. The Fuel formed by the derivative Fuel (RDF) has stable calorific value, and the calorific value ranges from 3800 kilocalories to 5500 kilocalories. The RDF gasification efficiency is high, the gas production rate is large, and the RDF gasification efficiency is stable and is about 2000m 3/ton. The components of the mixed combustible gas are stable, and the main components of the produced mixed combustible gas comprise CO (the content is 60-64%), H2 (the content is 26-29%), CH4 (the content is 2.6-3.8%), CnHm (the content is 0.2-0.4%), CO2 (the content is 4-6%) and the like. The generated mixed combustible gas has high heat value, and the heat value ranges from 900 kilocalories to 1300 kilocalories.
Optionally, step five is further followed by
Sixthly, dedusting, cooling, tar removing and pressurizing the mixed combustible gas generated in the fifth step;
and seventhly, dechlorinating and desulfurizing the mixed combustible gas obtained in the sixth step to obtain clean mixed combustible gas.
Optionally, the paper making waste obtained in the first step is subjected to primary crushing, roller screening, secondary crushing, magnetic separation, eddy current separation and air separation in sequence.
Optionally, the papermaking waste in the first step is dried by adding sludge after being subjected to an air separation process, the ratio of the papermaking waste to the sludge is 1: 20% -40%, the sludge moisture is within a range of 10% -15%, the papermaking waste moisture is within a range of 15% -20%, the moisture content of the papermaking waste material is within a range of 10% -15% after drying, and then the papermaking waste is crushed for three times, so that the papermaking waste is crushed into particle wadding with the particle size of less than or equal to 15mm multiplied by 20 mm.
Optionally, the ratio of the additive to the paper making waste in the second step is: 1% of paper making garbage, 5% -10% of calcium hydroxide, 5% -10% of zirconium oxide, 5% -8% of titanium dioxide, 8% -10% of sodium bicarbonate and 8% -15% of citric acid.
Optionally, step three forms the RDF into a column or block with a diameter ranging from 30mm to 60mm and a length of 200mm, and step four rapidly cools and solidifies the formed RDF, and then screens the formed RDF into an oversize and an undersize.
Optionally, in the fifth step, the formed RDF is placed into a dry distillation section in a high-temperature gasification furnace, a gasification section is arranged below the dry distillation section of the high-temperature gasification furnace, semicoke is arranged in the gasification section, mixed gas of low-pressure steam and air is introduced into the furnace bottom, the semicoke and the mixed gas react at a high temperature to generate a first combustible gas, the first combustible gas in the gasification section rises to dry distill the formed paper making garbage in the dry distillation section, and the formed RDF is subjected to dry distillation to generate a second combustible gas.
Optionally, the combustible gas in the fifth step passes through a primary high-efficiency deduster and a secondary high-efficiency deduster and then enters a high-efficiency dedusting cooler, the combustible gas II passes through a primary high-efficiency oil remover and then enters the high-efficiency dedusting cooler, and the combustible gas I and the combustible gas II are mixed at an outlet of the high-efficiency dedusting cooler.
Optionally, the mixed combustible gas in the step six is a first mixed combustible gas and a second mixed combustible gas, and the dust and light oil of the mixed combustible gas are removed by an electric catcher, and then the mixed combustible gas is pressurized by a pressurizing centrifugal blower.
Optionally, in the seventh step, the mixed combustible gas is introduced into a sodium hydroxide solution with the concentration of 5% -10%, and then the mixed combustible gas is conveyed into the spherical pressure container tank through a pipeline.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) according to the resource treatment method for the papermaking waste, the papermaking waste is crushed in multiple stages before RDF manufacturing, so that the particle size of 95% of the papermaking waste is smaller than or equal to 15mm multiplied by 20mm, the compactness of the RDF is improved, and the heat value of the formed RDF is improved.
(2) According to the paper-making waste recycling treatment method provided by the embodiment of the application, an additive composed of multiple elements such as calcium hydroxide, zirconium oxide, titanium dioxide, sodium bicarbonate and citric acid is added before the formed RDF is prepared. The additive has the functions of dioxin removal, sulfur fixation, chlorine fixation, nitrogen oxide removal, catalysis, combustion supporting, fuel value improvement, corrosion prevention, spot adhesion, filling, moisture prevention and the like. The additive can effectively absorb sulfur and chlorine in the garbage, greatly reduces the formation of sulfide and dioxin in the mixed combustible gas, greatly reduces the difficulty of gas purification, and saves the garbage treatment cost.
(3) According to the paper-making waste recycling treatment method provided by the embodiment of the application, the additive and the RDF are stirred and react to form a viscose-like mixture, so that the RDF is better in forming effect and high in strength, the RDF is not easy to scatter under the high-temperature condition, oxygen is easy to enter, and the gasification efficiency is high.
(4) According to the papermaking waste recycling treatment method provided by the embodiment of the application, the tar is removed by using the electric catcher, and the tar in the mixed combustible gas is eliminated by using the electric catching technology. The method is superior to water washing method, greatly reduces water consumption, lowers cost and reduces harm to environment. Because tar is easy to separate out below 100 ℃, the electric tar-capturing process is arranged before the chlorine and sulfur removal process, and the tar is removed before the mixed gas enters the NaOH solution pool, so that the solution in the solution pool is prevented from being polluted by the tar, the NaOH solution in the solution pool can be recycled, the workload is reduced, and the treatment cost is reduced.
(5) The resource treatment method for the papermaking waste provided by the embodiment of the application uses the NaOH solution pool to filter the residual sulfur and chlorine in the mixed gas. The NaOH solution pool solution can be reused. When the solution concentration decreased, further NaOH was added. The discharge of waste liquid in the production process is avoided, and the factors harmful to the environment are reduced.
(6) According to the paper-making waste recycling treatment method provided by the embodiment of the application, the finally obtained mixed combustible gas contains the biogas composed of gas components such as H2, C0, CH4 and CnHm, and the method is wide in industrial utilization range and high in economic value. In the paper-making garbage treatment process, sewage, waste gas and waste residues are not discharged outside, so that the environment protection in the treatment process is ensured.
Drawings
FIG. 1 is a flow chart of a paper-making waste recycling method provided by the invention;
FIG. 2 is a process flow chart of the paper making refuse RDF production process of the paper making refuse resource treatment method provided by the invention;
FIG. 3 is a flow chart of the RDF high-temperature pyrolysis gasification process of the paper-making waste recycling treatment method provided by the invention.
Detailed Description
For a further understanding of the present invention, reference is made to the following detailed description taken in conjunction with the accompanying drawings 1-3.
Example 1
With reference to fig. 1-3, the paper-making waste recycling method of the embodiment includes the following steps:
step one, performing multistage crushing, sorting, drying and magnetic separation on pretreated paper-making garbage, and crushing the paper-making garbage to floc with the particle size of less than or equal to 15mm multiplied by 20 mm;
step two, adding an additive into the papermaking waste wadding material obtained in the step one, and uniformly stirring;
thirdly, making the papermaking waste wadding material obtained in the second step into derived fuel through an RDF forming machine under high pressure;
step four, cooling and screening the formed derivative fuel obtained in the step three;
and fifthly, pyrolyzing and gasifying the formed derived fuel obtained in the fourth step at high temperature to generate mixed combustible gas.
The pretreatment of the paper-making garbage in the first step utilizes an MBT mechanical sorting technology, the paper-making garbage in the material pit is cleaned day to day, the garbage is treated within 10 hours, and secondary pollution to the environment is reduced. The components (such as plastics, paper, wood and the like) with high combustion value in the paper-making garbage are separated by utilizing separation and screening equipment, so that the combustible gas with high heat value is ensured to be produced. Through the steps, the paper-making garbage is prepared into the mixed combustible gas by utilizing the high-temperature pyrolysis gasification process of the paper-making garbage. The finally obtained mixed gas contains the biogas consisting of gas components such as H2, C0, CH4, CnHm and the like, and has wide industrial application range and high economic value. The Fuel formed by the derivative Fuel (RDF) has stable calorific value, and the calorific value ranges from 3800 kilocalories to 5500 kilocalories. The RDF gasification efficiency is high, the gas production rate is large, and the RDF gasification efficiency is stable and is about 2000m 3/ton. The components of the mixed combustible gas are stable, and the main components of the produced mixed combustible gas comprise CO (the content is 60-64%), H2 (the content is 26-29%), CH4 (the content is 2.6-3.8%), CnHm (the content is 0.2-0.4%), CO2 (the content is 4-6%) and the like. The generated mixed combustible gas has high heat value, and the heat value ranges from 900 kilocalories to 1300 kilocalories.
Example 2
With reference to fig. 1-3, compared with the technical solution of embodiment 1, the paper-making waste recycling method of this embodiment further includes the following steps
Sixthly, dedusting, cooling, tar removing and pressurizing the mixed combustible gas generated in the fifth step;
and seventhly, removing chlorine and sulfur from the mixed combustible gas obtained in the sixth step to obtain clean mixed combustible gas.
The mixed combustible gas is dedusted, cooled and tar-removed by a deduster, a cooler and an oil remover, impurities in the mixed combustible gas are removed, and the high-temperature combustible gas is cooled for subsequent processes. And finally, removing chlorine and sulfur from the mixed combustible gas, and removing sulfur and chlorine in the mixed combustible gas to further ensure the cleanness of the mixed combustible gas.
Example 3
With reference to fig. 1-3, compared with the technical solutions of embodiments 1 and 2, the paper-making waste recycling method of this embodiment sequentially undergoes primary crushing, roller screening, secondary crushing, magnetic separation, eddy current separation, and air separation.
The paper-making garbage can be split by a double-shaft shearing type crusher and crushed simultaneously by the double-shaft shearing type crusher. After primary crushing, more than 95 percent of the paper-making garbage is crushed into materials with the grain diameter less than or equal to 40mm multiplied by 50 mm. And then conveying the primarily crushed paper-making garbage to a roller screening process, screening out materials with the particle size of less than 15mm after the roller screening process, directly reusing the screened undersize materials (sand) in the paper-making industry, and directly conveying the oversize paper-making garbage materials to a secondary crushing process. The secondary crushing of the paper-making garbage can be realized by using a double-shaft shearing crusher, and after the secondary crushing, 95 percent of the paper-making garbage is crushed into materials with the grain size of less than or equal to 25mm multiplied by 30 mm. Then the paper-making garbage is sent into a magnetic separation procedure, and more than 95% of magnetic metal is removed after the magnetic separation procedure. Then the paper-making garbage is sent into an eddy current sorting procedure, and after the eddy current sorting procedure, more than 95% of non-magnetic metal is removed. And then, the paper-making garbage is sent to a wind power sorting procedure, under the action of airflow, the paper-making garbage is sorted according to the density and the granularity difference of the particles, and heavy substances of the paper-making garbage are sorted out and conveyed to a bin. The papermaking waste is crushed and the impurities such as metal and the like are easily removed through the sorting equipment, and the papermaking waste is crushed and sorted to prepare for the subsequent stirring process and the papermaking waste forming process, so that the papermaking waste is high in forming density and high in heat value.
Example 4
With reference to fig. 1-3, the paper-making waste recycling method of this embodiment is, compared with any one of the technical solutions of embodiments 1-3, that is, the paper-making waste of step one is dried by adding sludge after being subjected to a winnowing process, wherein the ratio of the paper-making waste to the sludge is 1: 20% -40%, the sludge moisture is within a range of 10% -15%, and the paper-making waste moisture is within a range of 15% -20%, after drying, the paper-making waste material is dried to have a moisture content within a range of 10% -15%, and then the paper-making waste is crushed for three times, so that the crushed paper-making waste has a particle size of 15mm × 20mm or less and is a particulate wad.
A certain amount of activated sludge is added into the paper-making garbage, and when the paper-making garbage is specifically applied, the proportion of the paper-making garbage to the activated sludge can be 1: 20%, 1: 30% or 1: 40%, the water content of the sludge is 10%, 12% or 15%, and the water content of the paper-making garbage is 15%, 17% or 20%. The activated sludge can stabilize the heat value of the paper-making garbage and prevent the paper-making garbage from damaging a furnace body and a pipeline due to too high combustion heat released during dry distillation. The activated sludge contains calcified matters, can fix chlorine and sulfur, and reduces acidic substances of mixed combustible gas generated by high-temperature pyrolysis and gasification of paper-making garbage. After drying, the water content of the paper-making garbage material is 10%, 12% or 15%, the requirement of the paper-making garbage forming technology on the water content of the material is met, the heat value of the formed paper-making garbage and the dryness of the mixed combustible gas are ensured, the gas water purification difficulty is reduced, and the gas purification cost is reduced. And (3) conveying the dried paper making garbage into a third crushing process by a chain plate conveyor, crushing more than 95% of the paper making garbage into particle flocs with the particle size of less than or equal to 15mm multiplied by 20mm after the third crushing process, wherein the paper making garbage crushed for three times meets the process requirements of the RDF forming process, so that the formed RDF has high density and high heat value.
Example 5
With reference to fig. 1 to 3, in the method for recycling paper-making waste of this embodiment, compared with any one of the technical solutions of embodiments 1 to 4, the ratio of the additive to the paper-making waste in the second step is: 1% of paper making garbage, 5% -10% of calcium hydroxide, 5% -10% of zirconium oxide, 5% -8% of titanium dioxide, 8% -10% of sodium bicarbonate and 8% -15% of citric acid.
The mixed combustible gas generated after the formed RDF is pyrolyzed and gasified at high temperature has harmful components, such as dioxin, and the like, and has serious pollution to the environment. The paper making garbage is added with additives consisting of 5%, 8% or 10% of calcium oxide, 5%, 8% or 10% of zirconium oxide, 5%, 6%, 7% or 8% of titanium dioxide, 8%, 9% or 10% of sodium bicarbonate, 8%, 11% or 15% of citric acid and the like. The additive has the functions of dioxin removal, sulfur fixation, chlorine fixation, nitrogen oxide removal, catalysis, combustion supporting, fuel value improvement, corrosion prevention, spot adhesion, filling, moisture prevention and the like. The sulfur and chlorine in the paper-making garbage can be effectively absorbed, the formation of sulfides and dioxin in the high-temperature pyrolysis and gasification process of the paper-making garbage is greatly reduced, the difficulty of purifying the mixed combustible gas is greatly reduced, and the purification cost is saved. And a small amount of sludge, fly ash and ash are added into the paper-making garbage, so that the heat value of the stably-formed RDF is improved, the compactness of the formed RDF is improved, and the aims of recycling resources and eliminating secondary pollution are fulfilled. The additive reacts with the paper-making garbage to generate a viscose-like mixture, so that the RDF has better forming effect and higher strength and is not easy to disperse at high temperature. The additive makes RDF have good forming effect and high compactness, so the gas yield is high during catalysis, the gas volume is large, and the gas is easy to discharge, thereby improving the gasification efficiency.
Example 6
With reference to fig. 1 to 3, in the recycling method of paper mill waste of this embodiment, compared with any one of the technical solutions of embodiments 1 to 5, the RDF is formed into a column or block with a diameter range of 30mm to 60mm and a length of 200mm in the third step, and the formed RDF is rapidly cooled and solidified in the fourth step, and then the formed RDF is sieved into an oversize product and an undersize product.
When the RDF is formed, high-pressure compression molding is adopted, so that the formed RDF also has higher temperature, namely about 80 ℃. The formed RDF requires rapid cooling before it can be put to the next process. Conveying the RDF subjected to compression molding to a vibration screening process by a chain plate machine, collecting undersize products, conveying the undersize products to the RDF molding process for re-compression molding, conveying oversize products to a stock ground by a belt, and conveying the oversize products to a high-temperature pyrolysis gasification furnace for gasification.
Example 7
With reference to fig. 1-3, in the paper-making waste recycling method of this embodiment, compared with any one of the technical solutions of embodiments 1-6, in the fifth step, the formed RDF is placed in a dry distillation section in a high-temperature gasification furnace, a gasification section is arranged below the dry distillation section of the high-temperature gasification furnace, the gasification section is provided with semicoke, mixed gas of low-pressure steam and air is introduced into the furnace bottom, the semicoke and the mixed gas react at a high temperature to generate a combustible gas one, the combustible gas one in the gasification section rises to dry-distill the paper-making waste formed in the dry distillation section, and the formed RDF is dry-distilled to generate a combustible gas two.
The gasification is carried out by using a two-stage fixed bed pyrolysis gasifier, and the ratio of the height to the diameter of the gasifier is at least 10-15 times (the height is larger than the diameter). The gasification temperature must be controlled to be above 850 ℃ and is higher than the temperature to effectively prevent the generation of toxic and harmful gases such as dioxin and the like. And lifting the formed RDF to a storage bin through lifting equipment, and adding the formed RDF to a dry distillation section of the two-section fixed bed pyrolysis gasification furnace through feeding equipment controlled by a program. Air is blown into the furnace bottom by an air blower, and simultaneously low-pressure steam is mixed with the air through a mixing box to be used as a gasifying agent to carry out gasification reaction with the semicoke at the high temperature of 1200 ℃, 1300 ℃ or 1600 ℃ in the gasification section, so that combustible gas I with 31-33 percent of CO, 9-10 percent of H2 and 0.4-0.5 percent of CH4 is generated; and simultaneously, the waste heat of the combustible gas I is utilized to dry distill the RDF formed in the dry distillation section to generate combustible gas II with the CO content of about 29-31%, the H2 content of about 17-19%, the CH4 content of about 1-3% and the CnHm content of about 0.2-0.4%.
Example 8
With reference to fig. 1-3, in the paper making waste recycling method of this embodiment, compared with any one of the technical solutions of embodiments 1-7, the combustible gas of the fifth step passes through the first-stage high-efficiency dust remover and the second-stage high-efficiency dust remover and then enters the high-efficiency dust removal cooler, the combustible gas of the second step passes through the first-stage high-efficiency oil remover and then enters the high-efficiency dust removal cooler, and the combustible gas of the first step and the combustible gas of the second step are mixed at the outlet of the high-efficiency dust removal cooler.
The combustible gas drives dust to enter the dust remover at a certain speed, and the dust remover rotates in the dust remover in a spiral line mode. The suspended dust particles are thrown to the inner surface of the cylinder under the action of centrifugal force and fall to the dust discharge pipe under the action of gravity, and the combustible gas enters the central pipe from the lower part of the dust remover to form ascending spiral airflow and leaves the dust remover from the top. The first-level efficient dust remover belongs to gas purification equipment, fully separates dust and large-particle objects in the first combustible gas, reduces the temperature of the first combustible gas to be below 100 ℃, mainly cools the first combustible gas to remove most of moisture in the first combustible gas, and condenses light oil mist of the first combustible gas. The cooler in the secondary high-efficiency dust remover is an indirect cooler which is not in direct contact with the combustible gas, so that direct contact between water and the combustible gas is avoided, a large amount of sewage is not generated, and the environment protection is facilitated. The second combustible gas passes through a first-stage high-efficiency oil remover, and dust and tar which are more than 98 percent of the second combustible gas can be removed. And the first combustible gas and the second combustible gas both pass through the high-efficiency dust removal cooler, and the first combustible gas and the second combustible gas are cooled in a double-vertical-pipe washing tower of the high-efficiency dust removal cooler, so that the temperature of the first combustible gas and the second combustible gas is not higher than 100 ℃. The gasified mixed combustible gas contains a large amount of dust, and the dust simultaneously adsorbs part of heavy metals. The dust and the heavy metal attached to the dust are removed while the gas is cooled, and the heavy metal component in the gas is greatly reduced.
Example 9
With reference to fig. 1-3, compared with any one of the technical solutions of embodiments 1-8, the method for recycling paper-making waste in this embodiment includes that the mixed combustible gas in the sixth step is a mixed combustible gas i and a combustible gas ii, and the mixed combustible gas is subjected to dust and light oil removal by an electric precipitator and then is pressurized by a pressurizing centrifugal blower. The mixed combustible gas is subjected to a series of dust removal, cooling and tar removal, certain pressure drop exists, the pressure of the purified mixed combustible gas is small, and the purified mixed combustible gas cannot be conveyed to the next procedure or a longer distance, and the mixed combustible gas is pressurized by a pressurizing centrifugal blower, so that the phenomenon that the conveying pressure of the mixed combustible gas is insufficient is improved, the mixed combustible gas has enough capacity to overcome the pipeline resistance, the following procedure tasks are completed, and the mixed combustible gas is conveyed to a longer distance.
Example 10
With reference to fig. 1-3, compared with any one of the technical solutions of embodiments 1-9, in the method for recycling paper-making waste of this embodiment, in the seventh step, the mixed combustible gas is introduced into a sodium hydroxide solution with a concentration of 5% -10%, and then the mixed combustible gas is transported into a spherical pressure container tank through a pipeline. And introducing the mixed combustible gas into a NaOH solution pool with the concentration of 5% -10%, and reacting H2S, S02, N0X and residual chlorine in the mixed gas with NaOH to eliminate sulfur, chlorine, nitrogen and the like in the mixed gas. And introducing the mixed combustible gas into the NaOH solution tank through air draft equipment, and adding NaOH tablets when the solution concentration of the solution tank is reduced. After the steps, the mixed combustible gas containing H2, C0, CH4, CnHm and the like is obtained. The mixed combustible gas is conveyed into the spherical pressure container tank through a pipeline to be stored and mixed, and the gas pressure is slowed down and stabilized. The output pipeline of the pressure container tank is communicated with a gas pipe network, and the mixed combustible gas can be directly used for industrial and civil gas supply or direct power generation.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (10)
1. A paper-making garbage resource treatment method is characterized by comprising the following steps:
step one, performing multistage crushing, sorting, drying and magnetic separation on pretreated paper-making garbage, and crushing the paper-making garbage to floc with the particle size of less than or equal to 15mm multiplied by 20 mm;
step two, adding an additive into the papermaking waste wadding material obtained in the step one, and uniformly stirring;
thirdly, making the papermaking waste wadding material obtained in the second step into derived fuel through an RDF forming machine under high pressure;
step four, cooling and screening the formed derivative fuel obtained in the step three;
and fifthly, pyrolyzing and gasifying the formed derived fuel obtained in the fourth step at high temperature to generate mixed combustible gas.
2. The paper making waste recycling method according to claim 1, further comprising the step of after the fifth step
Sixthly, dedusting, cooling, tar removing and pressurizing the mixed combustible gas generated in the fifth step;
and seventhly, dechlorinating and desulfurizing the mixed combustible gas obtained in the sixth step to obtain clean mixed combustible gas.
3. The paper making garbage resource treatment method as claimed in claim 1, wherein the paper making garbage of the first step is sequentially subjected to primary crushing, roller screening, secondary crushing, magnetic separation, eddy current separation and air separation.
4. The paper making garbage resource treatment method according to claim 1, characterized in that the paper making garbage in the first step is dried by adding sludge after being subjected to a winnowing process, the ratio of the paper making garbage to the sludge is 1: 20% -40%, the sludge moisture is within the range of 10% -15%, the paper making garbage moisture is within the range of 15% -20%, the water content of the paper making garbage is within the range of 10% -15% after being dried, and then the paper making garbage is crushed for three times, so that the crushed paper making garbage has the particle size of less than or equal to 15mm x 20mm and is a particle wadding.
5. The paper-making waste recycling method according to claim 1, wherein the ratio of the additive to the paper-making waste in the second step is: 1% of paper making garbage, 5% -10% of calcium hydroxide, 5% -10% of zirconium oxide, 5% -8% of titanium dioxide, 8% -10% of sodium bicarbonate and 8% -15% of citric acid.
6. The paper mill waste recycling method according to claim 1, wherein in the third step, the RDF is formed into a column or block with a diameter ranging from 30mm to 60mm and a length of 200mm, and in the fourth step, the formed RDF is rapidly cooled and solidified, and then the formed RDF is screened into an oversize material and an undersize material.
7. The paper-making garbage resource treatment method according to claim 1, characterized in that in the fifth step, the formed RDF is placed into a dry distillation section in a high-temperature gasification furnace, a gasification section is arranged below the dry distillation section of the high-temperature gasification furnace, semicoke is arranged in the gasification section, mixed gas of low-pressure steam and air is introduced into the furnace bottom, the semicoke and the mixed gas react at high temperature to generate a first combustible gas, the first combustible gas in the gasification section rises to dry distill the paper-making garbage formed in the dry distillation section, and the formed RDF is dry distilled to generate a second combustible gas.
8. The paper making waste recycling method according to claim 1 or 7, wherein the combustible gas in the fifth step passes through a primary high-efficiency dust remover and a secondary high-efficiency dust remover and then enters the high-efficiency dust removing cooler, the combustible gas II passes through a primary high-efficiency oil remover and then enters the high-efficiency dust removing cooler, and the combustible gas I and the combustible gas II are mixed at the outlet of the high-efficiency dust removing cooler.
9. The paper making waste recycling method according to claim 2, wherein the mixed combustible gas of the sixth step is a first combustible gas and a second combustible gas, and the mixed combustible gas is subjected to dust and light oil removal by an electric catcher and then is pressurized by a pressurizing centrifugal blower.
10. The paper-making waste recycling treatment method according to claim 2, characterized in that the seventh step is to introduce the mixed combustible gas into a sodium hydroxide solution with a concentration of 5% -10% for desulfurization, and then to convey the mixed combustible gas into the spherical pressure container tank through a pipeline.
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| CN113083479A (en) * | 2021-03-25 | 2021-07-09 | 福建龙迪环保设备科技有限公司 | Garbage pre-treatment method |
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