CN112430471B - Preparation process and production system of straw baking molded fuel and baking furnace - Google Patents
Preparation process and production system of straw baking molded fuel and baking furnace Download PDFInfo
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- CN112430471B CN112430471B CN202011539497.6A CN202011539497A CN112430471B CN 112430471 B CN112430471 B CN 112430471B CN 202011539497 A CN202011539497 A CN 202011539497A CN 112430471 B CN112430471 B CN 112430471B
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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
- C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/001—Handling, e.g. loading or unloading arrangements
- F26B25/003—Handling, e.g. loading or unloading arrangements for articles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/02—Biomass, e.g. waste vegetative matter, straw
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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
Abstract
The invention belongs to the field of biomass fuel production, and particularly relates to a preparation process, a production system and a baking furnace of straw baking molded fuel, wherein the system comprises a gas phase circulation unit and a solid molding unit, the gas phase circulation unit comprises the baking furnace, a hot blast stove and a heat exchanger which are connected in a gas phase circulation manner, the heat exchanger is also connected with a dryer through a gas phase pipeline, and the baking furnace is also connected with the heat exchanger through a gas phase pipeline; the solid forming unit is composed of a dryer, a baking furnace, a cooler, a pulverizer, a mixer, a heat preservation bin, a forming machine and a cooling dryer which are sequentially connected, and the cooler is communicated with the mixer through a liquid phase pipeline. The system recycles waste gas, saves energy and reduces emission; the interior of the baking furnace is not provided with a heating structure, automatic baking is realized by controlling the temperature of pyrolysis gas and the air input, and the baking temperature can be accurately controlled; in addition, the straw baking forming converts low-quality biomass energy into high-quality biomass baking forming fuel through process control.
Description
Technical Field
The invention belongs to the field of biomass fuel production, and particularly relates to a preparation process and a production system of a straw baking molded fuel and a baking furnace.
Background
China is a big agricultural country, and the yield of various straws is about 6 hundred million tons, and 3.5 hundred million tons can be obtained. The straws are mainly distributed in eastern areas, including North China plain and northeast plain, and are main distribution areas of crop straws in China. The straw is processed into the formed fuel, so that the density of the straw can be improved, the transportation, the storage and the application are convenient, the bottleneck of large-scale application of biomass is solved, the combustion performance of the straw is improved, and the energy utilization of the straw is promoted. However, compared with foreign wood biomass briquette, the straw briquette has the characteristics of low heat productivity, strong water absorption, small density, low strength and the like, and also limits the application and popularization of the straw briquette.
The straw baking is a pretreatment technology for slowly pyrolyzing the straws at the temperature of 200-300 ℃ under the oxygen-free or oxygen-deficient condition to generate a small amount of gas and liquid products. After the straw is baked, the activation energy, the heat productivity and the energy density can be increased, the grinding performance and the hydrophobic performance of the biomass are improved, the volatile component content is reduced, the fixed carbon content is increased, and the combustion performance of the biomass can be obviously improved.
The main components of the straw are cellulose, hemicellulose and lignin, and the content of the cellulose, the hemicellulose and the lignin is respectively 30-40%, 30-45% and 5-12%. When the temperature of the straw rises, the thermal decomposition temperatures of cellulose, hemicellulose and lignin are different and are respectively 180-350 ℃, 240-350 ℃ and 250-500 ℃. Hemicellulose is the least thermally stable and starts to decompose at lower baking temperatures, while cellulose and lignin decompose at higher temperatures. During the baking process, the content of cellulose and hemicellulose is reduced, the content of lignin is increased, the lignin softens and flows at a certain temperature and under a certain pressure during straw forming, the lignin is a binder during straw forming, the increase of the content of the lignin improves the density and the strength of the formed fuel, and the forming pressure can be reduced, so that the energy consumption is reduced, and the performance of the formed fuel is improved.
Disclosure of Invention
The invention aims to provide a preparation process of straw baked molded fuel, which converts low-quality biomass energy into high-quality biomass baked molded fuel through process control; meanwhile, a production system of the straw baking molded fuel is provided, and waste gas of the system is recycled, so that energy is saved and emission is reduced; meanwhile, the baking furnace is provided, the interior of the baking furnace is not provided with a heating structure, automatic baking is realized by controlling the temperature of pyrolysis gas and the air input, and the baking temperature can be accurately controlled.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation process of straw baked molded fuel comprises the following steps:
s1, crushing crop straws to the particle size of below 200mm, drying and dehydrating in a dryer until the water content is below 10%, then feeding the crop straws into a baking furnace, and directly heating the crop straws for 28-32 minutes by high-temperature pyrolysis gas at 240 ℃ in the baking furnace and then discharging the crop straws;
s2, cooling the solid product discharged after baking through a cooler, conveying the solid product to a crusher for crushing, mixing the solid product with high-temperature water in a mixer, controlling the temperature of the mixture to be above 90 ℃, controlling the water content of the mixture to be 11% -13%, conveying the mixture to a heat-insulating bin, keeping the temperature of the heat-insulating bin at 90-95 ℃ for 4 hours, then conveying the mixture to a forming machine for compact forming, drying and cooling, and packaging to obtain the product.
Further, a part of the pyrolysis gas generated by the baking furnace in the step S1 enters the hot blast furnace to be mixed and combusted with the auxiliary fuel to generate high-temperature flue gas, a part of the pyrolysis gas enters the heat exchanger to be heated, heat in the heat exchanger is provided by the high-temperature flue gas generated by the hot blast stove, the pyrolysis gas in the heat exchanger is discharged into the baking furnace when being heated to 240 ℃, and the high-temperature flue gas generated by the hot blast stove enters the drying machine to dry the straws when being cooled to 200 ℃ after being subjected to heat exchange by the heat exchanger.
Further, the control process of the baking furnace in S1 is that the first thermocouple is located in the blanking section for measuring the pyrolysis gas temperature, controlling the first thermocouple temperature to 60 ℃, when the temperature is too high, the air inflow is reduced, otherwise, the air inflow is increased, the second thermocouple is positioned at the lower part of the temperature rising section, the third thermocouple is positioned at the upper part of the constant temperature section, the temperature of the second thermocouple is controlled to be lower than that of the third thermocouple, the fourth thermocouple is positioned at the upper part of a grate at the lower part of the constant temperature section, used for measuring the baking temperature, the temperature of the fourth thermocouple is 240 ℃, the temperature of the third thermocouple is controlled to be equal to that of the fourth thermocouple, when the temperature of the second thermocouple is close to that of the third thermocouple, the baked straws fall through the fire grate and are discharged out of the baking furnace through the discharge port, the materials in the furnace descend, the temperature of the second thermocouple descends first, the discharge speed is adjusted, the temperature of the third thermocouple is equal to that of the fourth thermocouple, and the temperature of the second thermocouple is lower than that of the third thermocouple.
Further, the high-temperature water in the mixer in S2 comes from water at 90 ℃ or higher which is removed by heat exchange in the cooler.
A production system of straw baking molded fuel comprises a gas phase circulation unit and a solid molding unit, wherein the gas phase circulation unit comprises a baking furnace, a hot blast stove and a heat exchanger which are connected in a gas phase circulation manner, the heat exchanger is also connected with a dryer through a gas phase pipeline, and the baking furnace is also connected with the heat exchanger through a gas phase pipeline;
the solid forming unit comprises a dryer, a baking furnace, a cooler, a pulverizer, a mixer, a heat preservation bin and a forming machine which are sequentially connected, and the cooler is communicated with the mixer through a liquid phase pipeline.
Further, the upper portion of the baking furnace is provided with a low-temperature pyrolysis gas outlet, the lower portion of the baking furnace is provided with a high-temperature pyrolysis gas inlet, the hot blast furnace and the heat exchanger are respectively provided with a pyrolysis gas inlet, the low-temperature pyrolysis gas outlet of the baking furnace is communicated with the pyrolysis gas inlet of the hot blast furnace and the pyrolysis gas inlet of the heat exchanger through pipelines provided with valves, the high-temperature flue gas outlet of the hot blast furnace is communicated with the high-temperature flue gas inlet of the heat exchanger, the tail portion of the heat exchanger is provided with a high-temperature pyrolysis gas outlet, the bottom of the heat exchanger is provided with a heat exchange flue gas outlet, the high-temperature pyrolysis gas outlet is communicated with the high-temperature pyrolysis gas inlet of the baking furnace, and the heat exchange flue gas outlet is communicated with the flue gas inlet of the dryer.
Further, a fan is communicated with a main pipeline of the baking furnace, which is connected with the hot blast stove and the heat exchanger.
Further, the desiccator passes through the lifting machine hookup with the baking furnace, the baking furnace bottom is equipped with the solid product export, the top of cooler is equipped with the solid material import, and the solid product export of baking furnace is corresponding with the solid material import position of cooler, the cooler passes through the lifting machine hookup with the rubbing crusher, rubbing crusher passes through the tuber pipe intercommunication with the machine that mixes, the bottom of cooler is equipped with the cooling water import, and the top is equipped with the hot water export, the hot water export passes through the pipeline and mixes the water inlet intercommunication of machine, the import of the material export intercommunication heat preservation feed bin of machine that mixes, the export of heat preservation feed bin and the material import hookup of make-up machine, the material export of make-up machine passes through the lifting machine hookup with the cooling drying machine.
The utility model provides a baking furnace, includes the furnace body, the furnace body lower part has high temperature pyrolysis gas import, has low temperature pyrolysis gas export on furnace body upper portion, the inside of furnace body includes blanking section, the section of rising the temperature, the constant temperature section that from the top down set up, the grate is installed to the lower part of constant temperature section, corresponds respectively on the side of furnace body corresponding to blanking section, the section lower part of rising the temperature, constant temperature section upper portion, constant temperature section lower part grate upper portion and is equipped with first thermocouple, second thermocouple, third thermocouple, fourth thermocouple.
Further, the second thermocouple was 20cm from the third thermocouple.
Advantageous effects
The invention provides a straw baking and forming system which comprises a gas phase circulation unit and a solid forming unit, wherein straws in the gas phase circulation unit enter a baking furnace after being dried, the baking furnace is internally provided with no heating structure, a 240 ℃ pyrolysis gas direct heating mode is adopted in the furnace, the temperature of a thermocouple in the furnace is controlled by controlling air inflow to realize automatic baking, a part of pyrolysis gas generated after the straws are pyrolyzed enters a hot air furnace to be mixed and combusted with auxiliary fuel to generate high-temperature flue gas, a part of pyrolysis gas enters a heat exchanger, meanwhile, the high-temperature flue gas generated by a hot air furnace enters the heat exchanger to exchange heat with low-temperature pyrolysis gas entering the heat exchanger in the baking furnace, the low-temperature pyrolysis gas is heated to 240 ℃ and enters the baking furnace for cyclic utilization, the high-temperature flue gas generated by the hot air furnace enters a drying machine to be dried after being subjected to heat exchange through the heat exchanger and then being cooled to 200 ℃, and the baking furnace comprises a blanking section from top to bottom, a solid forming section and a solid forming section, The furnace body is provided with a feeding section, a heating section and a constant temperature section, wherein the lower part of the constant temperature section is provided with a grate, and the side surface of the furnace body is respectively and correspondingly provided with a first thermocouple, a second thermocouple, a third thermocouple and a fourth thermocouple corresponding to the feeding section, the lower part of the heating section, the upper part of the constant temperature section and the upper part of the grate below the constant temperature section. The first thermocouple is positioned in the blanking section and used for measuring the temperature of pyrolysis gas, the temperature of the first thermocouple is controlled to be 60 ℃, when the temperature is too high, the air inflow is reduced, otherwise, the air inflow is increased, the second thermocouple is positioned at the lower part of the heating section, the third thermocouple is positioned at the upper part of the constant temperature section and used for controlling the temperature of the second thermocouple to be lower than that of the third thermocouple, the fourth thermocouple is positioned at the upper part of a grate at the lower part of the constant temperature section and used for measuring the baking temperature, the temperature of the fourth thermocouple is 240 ℃, the temperature of the third thermocouple and the temperature of the fourth thermocouple are controlled to be equal, when the temperature of the second thermocouple is close to that of the third thermocouple, the baked straws fall through the grate and are discharged out of the baking furnace from a discharge port, the materials in the furnace fall, the temperature of the second thermocouple falls first, the discharging speed is adjusted, the temperature of the third thermocouple is equal to that of the fourth thermocouple, the temperature of the second thermocouple is lower than that of the third thermocouple, and the whole system can realize stable operation by controlling the air inflow, in addition, redundant waste gas cannot be generated, the system waste heat is fully utilized, and the purposes of energy conservation and emission reduction are achieved.
During solid forming, high-temperature water produced by the system cooler is directly mixed with the crushed baking materials, and the mixture is directly formed by utilizing the waste heat of the mixture, so that the production is facilitated.
The biomass fuel produced by the process has the advantages of high heat productivity, high density, high strength and great improvement on various parameters.
Drawings
FIG. 1 is a schematic diagram of the connection of the overall system of the present invention;
FIG. 2 is a schematic view showing the overall structure of the baking furnace of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are intended to illustrate the invention only and are not intended to limit the scope of the invention.
A production system of straw baking molded fuel comprises a gas phase circulation unit and a solid molding unit, wherein the gas phase circulation unit comprises a baking furnace 1, a hot blast stove 2 and a heat exchanger 3 which are connected in a gas phase circulation manner, the heat exchanger 3 is also connected with a drier 4 through a gas phase pipeline, and the baking furnace 1 is also connected with the heat exchanger 3 through a gas phase pipeline; specifically, the upper portion of the baking furnace 1 is provided with a low-temperature pyrolysis gas outlet 105, the lower portion of the baking furnace 1 is provided with a high-temperature pyrolysis gas inlet 106, the hot-blast furnace 2 and the heat exchanger 3 are respectively provided with a pyrolysis gas inlet, the low-temperature pyrolysis gas outlet 105 of the baking furnace 1 is communicated with the pyrolysis gas inlet of the hot-blast furnace 2 and the pyrolysis gas inlet of the heat exchanger 3 through pipelines provided with valves, the baking furnace 1 is communicated with a main pipeline connecting the hot-blast furnace 2 and the heat exchanger 3 and is provided with a fan, the high-temperature flue gas outlet of the hot-blast furnace 2 is communicated with the high-temperature flue gas inlet of the heat exchanger 3, the tail portion of the heat exchanger 3 is provided with a high-temperature pyrolysis gas outlet, the bottom portion of the heat exchanger is provided with a heat exchange flue gas outlet, the high-temperature pyrolysis gas outlet is communicated with the high-temperature pyrolysis gas inlet 106 of the baking furnace 1, and the heat exchange flue gas outlet is communicated with the flue gas inlet of the dryer 4.
The solid forming unit comprises a drier 4, a baking furnace 1, a cooler 5, a pulverizer 6, a mixer 7, a heat preservation bin 8, a forming machine 9 and a cooling dryer 10 which are sequentially connected, wherein the cooler 5 is communicated with the mixer 7 through a liquid phase pipeline, specifically, the drier 4 is connected with the baking furnace 1 through a lifter 11, the bottom of the baking furnace 1 is provided with a solid product outlet, the top of the cooler 5 is provided with a solid material inlet, the solid product outlet of the baking furnace 1 is corresponding to the solid material inlet position of the cooler 5, the cooler 5 is connected with the pulverizer 6 through the lifter 11, the pulverizer 6 is communicated with the mixer 7 through an air pipe, the bottom of the cooler 5 is provided with a cooling water inlet, the top of the cooler is provided with a hot water outlet, the hot water outlet is communicated with the water inlet of the mixer 7 through a pipeline, and the material outlet of the mixer 7 is communicated with the inlet of the heat preservation bin 8, the outlet of the heat insulation bin 8 is connected with the material inlet of a forming machine 9, and the material outlet of the forming machine 9 is connected with a cooling dryer 10 through a hoist 11.
As shown in fig. 2, a baking furnace 1 comprises a furnace body, a high-temperature pyrolysis gas inlet 106 is arranged at the lower part of the furnace body, a low-temperature pyrolysis gas outlet 105 is arranged at the upper part of the furnace body, the furnace body comprises a blanking section 101, a heating section 102 and a constant temperature section 103 which are arranged from top to bottom, a grate 104 is arranged at the lower part of the constant temperature section 103, a first thermocouple 107, a second thermocouple 108, a third thermocouple 109 and a fourth thermocouple 110 are respectively and correspondingly arranged on the side surface of the furnace body corresponding to the blanking section 101, the lower part of the heating section 102, the upper part of the constant temperature section 103 and the upper part of the grate 104 at the lower part of the constant temperature section 103, and the second thermocouple 108 is 20cm away from the third thermocouple 109.
A preparation process of straw baked molded fuel comprises the following steps:
1. the crop straws are crushed to be less than 200mm in particle size, the crop straws are dried and dehydrated in a dryer 4 until the water content is less than 10%, the crop straws enter a baking furnace 1, the crop straws are directly heated for 30 minutes by high-temperature pyrolysis gas at 240 ℃ in the baking furnace 1 and then discharged, a part of the pyrolysis gas generated by the baking furnace 1 enters a hot blast stove 2 and is mixed and combusted with auxiliary fuel to generate high-temperature flue gas, a part of the pyrolysis gas enters a heat exchanger 3 for heating, the heat in the heat exchanger 3 is provided by the high-temperature flue gas generated by the hot blast stove 2, the pyrolysis gas in the heat exchanger 3 is discharged into the baking furnace 1 when being heated to 240 ℃, and the high-temperature flue gas generated by the hot blast stove 2 enters the dryer 4 for drying the straws when being cooled to 200 ℃ after being subjected to heat exchange by the heat exchanger 3.
2. Cooling the baked solid product by a cooler 5, conveying the cooled solid product to a crusher 6 for crushing, mixing the crushed solid product with high-temperature water in a mixer 7, controlling the temperature of the mixture to be above 90 ℃, enabling the high-temperature water in the mixer 7 to come from the water with the temperature of above 90 ℃ discharged by the cooler 5 through heat exchange, controlling the water content of the mixture to be 11% -13%, conveying the mixture to a heat-insulating bin 8, insulating the mixture in the heat-insulating bin 8 for 4 hours at the temperature of 90-95 ℃, then conveying the mixture to a forming machine 9 for compact forming, drying, cooling and packaging to obtain the product.
Wherein, the control process of the baking furnace 1 is that a first thermocouple 107 is positioned in a blanking section 101 and is used for measuring the temperature of pyrolysis gas, the temperature of the first thermocouple 107 is controlled to be 60 ℃, when the temperature is overhigh, the air input amount is reduced, otherwise, the air input amount is increased, a second thermocouple 108 is positioned at the lower part of a temperature rising section 102, a third thermocouple 109 is positioned at the upper part of a constant temperature section 103, the temperature of the second thermocouple 108 is controlled to be lower than that of the third thermocouple 109, a fourth thermocouple 110 is positioned at the upper part of a grate 104 at the lower part of the constant temperature section 103 and is used for measuring the baking temperature, the temperature of the fourth thermocouple 110 is 240 ℃, the temperature of the third thermocouple 109 is controlled to be equal to that of the fourth thermocouple 110, when the temperature of the second thermocouple 108 is close to that of the third thermocouple 109, the baked straws fall down through the grate 104 and are discharged out of the baking furnace 1 from a discharge port, the temperature of the furnace is reduced, the temperature of the second thermocouple 108 is firstly reduced, the discharge speed is adjusted, so that the temperature of the third thermocouple 109 is equal to the fourth thermocouple 110, the second thermocouple 108 is cooler than the third thermocouple 109.
Example (b): corn stalk baking and forming process
After being conveyed to a field, the corn straws are crushed to be less than 200mm, dried in a drier to have the water content of less than 10 percent, and then enter a baking furnace to be directly heated for 30 minutes by pyrolysis gas at 240 ℃ and then discharged.
The method comprises the steps of discharging corn straws from a baking furnace, cooling to 90-100 ℃ by a water-cooling auger of a cooler, simultaneously controlling the speed of cooling water to control the temperature of the discharged water to be above 90 ℃, crushing the baked straws, mixing the crushed baked straws with high-temperature water to control the water content of the baked straws to be 10-12%, storing the crushed baked straws in a heat-preservation forming bin for more than 4 hours, forming the crushed straws by a forming machine, producing corn straw baked formed fuel with the required size, cooling, screening and packaging, and then warehousing.
Test example:
taking the corn straw in Henan as an example, the parameters of the direct straw molding and the molded fuel obtained by the process are as follows:
after comparison, the lower calorific value of the baked straw formed particles is increased from 15.54 MJ/kg to 20.26 MJ/kg, the moisture content is reduced from 9.52% to 4.43%, the breakage rate is reduced from 8.5% to 4.36%, the density is increased from 1.051 g/cm3 to 1.136 g/cm3, and all parameters are greatly improved.
Claims (8)
1. A preparation process of straw baked molded fuel is characterized by comprising the following steps:
s1, crushing crop straws to the particle size of below 200mm, drying and dehydrating in a dryer until the water content is below 10%, then feeding the crop straws into a baking furnace, and directly heating the crop straws for 28-32 minutes by high-temperature pyrolysis gas at 240 ℃ in the baking furnace and then discharging the crop straws;
s2, cooling the solid product discharged after baking by a cooler, conveying the solid product to a crusher for crushing, mixing the solid product with high-temperature water in a mixer, controlling the temperature of the mixture to be above 90 ℃ and the water content of the mixture to be 11% -13%, conveying the mixture to a heat-insulating bin, keeping the temperature of the heat-insulating bin at 90-95 ℃ for 4 hours, conveying the mixture to a forming machine for compact forming, drying and cooling, and packaging to obtain a product;
the control process of the baking furnace in the S1 is that a first thermocouple is positioned in the blanking section and is used for measuring the temperature of the pyrolysis gas, controlling the temperature of the first thermocouple to be 60 ℃, when the temperature is too high, the air inflow is reduced, otherwise, the air inflow is increased, the second thermocouple is positioned at the lower part of the temperature rising section, the third thermocouple is positioned at the upper part of the constant temperature section, the temperature of the second thermocouple is controlled to be lower than that of the third thermocouple, the fourth thermocouple is positioned at the upper part of a grate at the lower part of the constant temperature section, used for measuring the baking temperature, the temperature of the fourth thermocouple is 240 ℃, the temperature of the third thermocouple is controlled to be equal to that of the fourth thermocouple, when the temperature of the second thermocouple is close to that of the third thermocouple, the baked straws fall through the fire grate and are discharged out of the baking furnace through the discharge port, the materials in the furnace descend, the temperature of the second thermocouple descends first, the discharge speed is adjusted, the temperature of the third thermocouple is equal to that of the fourth thermocouple, and the temperature of the second thermocouple is lower than that of the third thermocouple.
2. The process for preparing straw-torrefying briquette fuel as claimed in claim 1, wherein a part of the pyrolysis gas generated by the torrefaction furnace in S1 is introduced into the hot air furnace to be mixed with the auxiliary fuel for combustion to generate high-temperature flue gas, a part of the pyrolysis gas is heated by the heat exchanger, the heat is provided by the high-temperature flue gas generated by the hot air furnace, the pyrolysis gas is heated to 240 ℃ by the heat exchanger and then introduced into the torrefaction furnace, and the high-temperature flue gas generated by the hot air furnace is cooled to 200 ℃ after heat exchange by the heat exchanger and then introduced into the dryer for drying the straw.
3. The process for preparing straw torrefaction molded fuel as claimed in claim 1, wherein the high temperature water of the mixer in the S2 is water of 90 ℃ or higher discharged from a cooler through heat exchange.
4. The production device for the preparation process of the straw torrefaction forming fuel, which is used for the preparation process of the straw torrefaction forming fuel, is characterized by comprising a gas phase circulation unit and a solid forming unit, wherein the gas phase circulation unit comprises a torrefaction furnace, a hot blast stove and a heat exchanger which are connected in a gas phase circulation manner, the heat exchanger is also connected with a drier through a gas phase pipeline, and the torrefaction furnace is also connected with the heat exchanger through a gas phase pipeline;
the solid forming unit consists of a dryer, a baking furnace, a cooler, a pulverizer, a mixer, a heat insulation bin, a forming machine and a cooling dryer which are sequentially connected, wherein the cooler is also communicated with the mixer through a liquid phase pipeline;
the baking furnace comprises a furnace body, the furnace body lower part has high temperature pyrolysis gas import, has low temperature pyrolysis gas export on furnace body upper portion, the inside of furnace body includes blanking section, the section of heating, the constant temperature section that from the top down set up, the grate is installed to the lower part of constant temperature section, corresponds respectively on the side of furnace body corresponding to blanking section, the section lower part of heating, constant temperature section upper portion, constant temperature section lower part grate upper portion and is equipped with first thermocouple, second thermocouple, third thermocouple, fourth thermocouple.
5. The production device according to claim 4, wherein the hot blast stove and the heat exchanger are respectively provided with a pyrolysis gas inlet, the low-temperature pyrolysis gas outlet of the baking furnace is respectively communicated with the pyrolysis gas inlet of the hot blast stove and the pyrolysis gas inlet of the heat exchanger through pipelines provided with valves, the high-temperature flue gas outlet of the hot blast stove is communicated with the high-temperature flue gas inlet of the heat exchanger, the tail part of the heat exchanger is provided with a high-temperature pyrolysis gas outlet, the bottom part of the heat exchanger is provided with a heat exchange flue gas outlet, the high-temperature pyrolysis gas outlet is communicated with the high-temperature pyrolysis gas inlet of the baking furnace, and the heat exchange flue gas outlet is communicated with the flue gas inlet of the dryer.
6. The production apparatus as claimed in claim 5, wherein a fan is provided in the main line connecting the hot blast stove and the heat exchanger of the baking furnace.
7. The production device according to claim 4, wherein the dryer is connected with the baking furnace through a lifter, the bottom of the baking furnace is provided with a solid product outlet, the top of the cooler is provided with a solid material inlet, the solid product outlet of the baking furnace corresponds to the solid material inlet of the cooler, the cooler is connected with the crusher through the lifter, the crusher is communicated with the mixer through an air pipe, the bottom of the cooler is provided with a cooling water inlet, the top of the cooler is provided with a hot water outlet, the hot water outlet is communicated with the water inlet of the mixer through a pipeline, the material outlet of the mixer is communicated with the inlet of the heat-insulating bin, the outlet of the heat-insulating bin is connected with the material inlet of the forming machine, and the material outlet of the forming machine is connected with the cooling dryer through the lifter.
8. The production apparatus according to claim 4, wherein the second thermocouple and the third thermocouple of the baking furnace are spaced apart by 20 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011539497.6A CN112430471B (en) | 2020-12-23 | 2020-12-23 | Preparation process and production system of straw baking molded fuel and baking furnace |
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| CN202011539497.6A CN112430471B (en) | 2020-12-23 | 2020-12-23 | Preparation process and production system of straw baking molded fuel and baking furnace |
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| CN112430471A CN112430471A (en) | 2021-03-02 |
| CN112430471B true CN112430471B (en) | 2022-03-29 |
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| CN202558836U (en) * | 2012-01-04 | 2012-11-28 | 武汉伊世特招商投资工程有限公司 | Moving and energy self-supporting type biomass collection and carbonization treatment integrated device |
| CN106944455A (en) * | 2017-02-27 | 2017-07-14 | 天津大学 | A kind of old circuit board fixed-bed pyrolysis system of high-temperature gas seepage flow heating |
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| CA2482571A1 (en) * | 2004-09-27 | 2006-03-27 | 9103-7366 Quebec Inc. | Apparatus for treating lignocellulosic material, and method of treating associated thereto |
| US8449724B2 (en) * | 2009-08-19 | 2013-05-28 | Andritz Technology And Asset Management Gmbh | Method and system for the torrefaction of lignocellulosic material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202558836U (en) * | 2012-01-04 | 2012-11-28 | 武汉伊世特招商投资工程有限公司 | Moving and energy self-supporting type biomass collection and carbonization treatment integrated device |
| CN106944455A (en) * | 2017-02-27 | 2017-07-14 | 天津大学 | A kind of old circuit board fixed-bed pyrolysis system of high-temperature gas seepage flow heating |
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