CN115682664A - Biomass residue drying system - Google Patents
Biomass residue drying system Download PDFInfo
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- CN115682664A CN115682664A CN202211270735.7A CN202211270735A CN115682664A CN 115682664 A CN115682664 A CN 115682664A CN 202211270735 A CN202211270735 A CN 202211270735A CN 115682664 A CN115682664 A CN 115682664A
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- dryer
- heat exchange
- cooler
- biomass
- processed
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- 239000002028 Biomass Substances 0.000 title claims abstract description 46
- 238000001035 drying Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 103
- 239000007921 spray Substances 0.000 claims abstract description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 17
- 238000001704 evaporation Methods 0.000 claims abstract description 11
- 230000008020 evaporation Effects 0.000 claims abstract description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 239000000428 dust Substances 0.000 claims description 30
- 239000011261 inert gas Substances 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 12
- 239000002904 solvent Substances 0.000 abstract description 2
- 238000011084 recovery Methods 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 6
- 238000004064 recycling Methods 0.000 description 5
- 229910001873 dinitrogen Inorganic materials 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 2
- 229920002678 cellulose Polymers 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 208000003643 Callosities Diseases 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 206010020649 Hyperkeratosis Diseases 0.000 description 1
- 240000000111 Saccharum officinarum Species 0.000 description 1
- 235000007201 Saccharum officinarum Nutrition 0.000 description 1
- 240000006394 Sorghum bicolor Species 0.000 description 1
- 235000011684 Sorghum saccharatum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009270 solid waste treatment Methods 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
Images
Classifications
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Processing Of Solid Wastes (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention relates to a biomass residue drying system, which comprises a biomass treatment system, a moisture evaporation system and a heat exchange system. In the process, gas (such as nitrogen) is selected as a heat carrier, the gas (such as nitrogen) is recycled, the oxygen content of a drying system is controllable, and the system is safe and reliable. According to the invention, the dry materials at the outlet are continuously and quantitatively back-mixed, the water content of the materials at the inlet of the dryer is reduced, the viscosity of the materials is reduced, the continuous and stable operation of the system is ensured, and the recovery of the solvent in the materials is realized through spray cooling.
Description
Technical Field
The invention relates to a biomass residue drying system, in particular to a biomass residue drying system capable of realizing internal circulation.
Background
In the field of agricultural product deep processing, food beverages or chemical products are produced by taking agricultural products (such as corns, soybeans, sorghum, sugarcane, straws and the like) as raw materials, a large amount of organic wastewater is generated along with the production of the organic wastewater, a certain amount of biomass residues are obtained after the wastewater is concentrated, the residues contain a large amount of cellulose, protein, lignin, water and organic solvents, the moisture content of the residues is large and even more than 50%, a large amount of space is occupied by long-term stacking, peculiar smell is generated after fermentation, the surrounding environment is seriously affected, and the biomass residues are an important pollution source of environmental pollution at present. Therefore, a biomass residue reduction, stabilization and resource treatment technology is needed.
The biomass residue can be reduced and stabilized through drying, the water content of the dried biomass residue is reduced, the heat value is relatively increased, and the biomass residue can be used for incineration power generation, so that the resource utilization of the biomass residue is realized; the dried biomass residue can also be used for composting, extracting cellulose for paper making, fermenting to produce methane and processing feed. The biomass residue generally contains organic solvent, has high material viscosity, and needs a large, safe and stable biomass residue drying technology for realizing industrial application.
Disclosure of Invention
In order to solve the above-mentioned problems, the present invention provides a biomass residue drying system, which comprises
The biomass processing system comprises a dryer for drying materials, the dryer comprises a material inlet to be processed and a processed material outlet, the processed material outlet comprises a first processed material outlet for discharging the processed materials out of the system and a second processed material circulating outlet for quantitatively back-mixing the processed materials, and the second processed material circulating outlet is connected with a metering conveyor for controlling the using amount of the materials to be back-mixed; in the biomass processing system, a material to be processed enters a dryer from an inlet for drying, after drying is finished, a part of the material to be processed is discharged out of a system from a first processed material outlet, when the water content of the material to be processed (wet material) is more than 3%, the other part of the dried processed material is back-mixed to the material to be processed and mixed with the material to be processed so as to reduce the water content of the material to be processed, the water content of the mixed material to be processed is generally lower than 10%, the mixed material to be processed enters the dryer for drying, and a metering conveyor calculates the needed back-mixed processed material (dry material) to realize quantitative back-mixing.
The moisture evaporation system comprises inert gas used for carrying out moisture in the biomass and controlling the oxygen content in the whole system, a fan used for pressurizing the inert gas and a heater used for heating the inert gas, the inert gas enters the dryer from the tail end of the dryer after being pressurized and heated and is directly contacted with the material to be treated so as to carry out the moisture in the biomass, and the inert gas carries the moisture and is discharged from a pipeline at the head end of the dryer; the inert gas can be any other gas capable of pumping moisture from the material to be treated, such as inert gas, and is preferably inert nitrogen gas from the economic and effect viewpoints, the inert gas has the function of controlling the oxygen content in the whole system besides being used for carrying away the moisture in the material to be treated, the oxygen content in a moisture evaporation system is controlled within 12% by adjusting the input amount of nitrogen gas (or other suitable gases), the temperature of the nitrogen gas after being heated is about 100-160 ℃, and the nitrogen gas after being contacted with the material to be treated is favorable for evaporating the moisture in the biomass residue.
The heat exchange system comprises a heat exchange pipeline and hot steam, the heat exchange pipeline and the hot steam are arranged in the dryer, the hot steam enters the heat exchange pipeline from the tail end of the dryer and indirectly contacts with the material to be treated to exchange heat, so that moisture in the material to be treated is evaporated in an accelerated manner, and the hot steam is cooled into steam condensate after the heat exchange is finished and flows out. The hot steam flows in the heat exchange pipeline and indirectly contacts with the material to be treated in the dryer to exchange heat and evaporate the moisture of the material to be treated, thereby achieving the aim of drying.
Furthermore, the biomass processing system also comprises a mixer for mixing the material to be processed and the dry material and a conveyer which is connected with the mixer and is used for conveying the mixed material to be processed to the dryer. The material to be treated and the back-mixed treated material (dry material) are uniformly mixed in the mixer and then enter the conveyer, and the mixed material to be treated is sent to the dryer for drying by the conveyer.
Furthermore, the moisture evaporation system also comprises a dust remover communicated with the head end of the dryer and a spray cooler communicated with the top of the dust remover, the inert gas carrying moisture is discharged from the head end of the dryer and enters the dust remover for dust removal, the gas after dust removal is discharged from the dust remover and enters the spray cooler for spray cooling and then is discharged, and the spray cooler is communicated with the fan. The dryer head end is an inlet end of a material to be treated, the dryer tail end is an outlet end of the treated material, inert gas enters the dryer from the dryer tail end and directly contacts the material to be treated, under the heat provided by the heat exchange system, water in the material to be treated is evaporated and mixed with the inert gas, the inert gas carries the evaporated water to be discharged from the dryer head end and enters the dust remover to remove dust and other substances possibly carried in the inert gas, solid substances are discharged from the bottom of the dust remover, gas is discharged from the top of the dust remover and then enters the spray cooler, the gas enters a pipeline communicated with the fan after being sprayed and cooled, and the gas can be recycled or discharged out of the system after being pressurized by the fan.
Preferably, the spray cooler comprises a spray tower communicated with the top of the dust remover and a cooler communicated with the bottom of the spray tower, and the tail end of the cooler is communicated with the top of the spray tower. In the preferred scheme, the dedusted gas enters the spray tower from the bottom of the spray tower for spraying, the sprayed gas is discharged from the top of the spray tower and enters a pipeline communicated with the fan for recycling or discharging from a system, the sprayed liquid enters the cooler from the bottom of the spray tower through the spray pump for heat exchange cooling, and the cooled liquid is discharged from the tail end of the cooler.
Preferably, the cooler performs heat exchange cooling on the liquid through a second heat exchange system, and the second heat exchange system comprises a cold water inlet arranged at the tail end of the cooler, a second heat exchange pipeline arranged in the cooler and an outlet arranged at the head end of the cooler.
Furthermore, the dust remover is a cyclone dust remover, a bag-type dust remover or a combination of the cyclone dust remover and the bag-type dust remover.
Further, the heat exchange tubes are arranged concentrically within the dryer, which arrangement facilitates sufficient contact between the tubes and the material to be treated to evaporate water.
Further, the dryer is a steam rotary dryer, a paddle dryer or a disc dryer.
The method has the beneficial effects that 1, the process of the method accords with the development direction of solid waste treatment: a biomass residue drying process with closed circulation and quantitative back mixing of gas (such as nitrogen) is selected, and the process realizes reduction, stabilization and recycling of biomass residues.
2. In the process of the method, gas (such as nitrogen) is selected as a heat carrier, the gas (such as nitrogen) is recycled, the oxygen content of a drying system is controllable, and the system is safe and reliable.
3. In the process of the method, because the biomass residues have certain viscosity and are easy to stick to the wall during drying, the efficiency of the dryer is reduced, dry materials are continuously and quantitatively back-mixed through an outlet, the water content of the materials at the inlet of the dryer is reduced, the viscosity of the materials is reduced, and the continuous and stable operation of the system is ensured.
4. The solvent in the material is recovered by spray cooling in the process of the method.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will be further explained and illustrated with reference to the drawings.
Referring to fig. 1, the present invention provides a biomass residue drying system, which comprises
The biomass processing system comprises a dryer 3 for drying materials, the dryer 3 comprises a material to be processed inlet 31 and a processed material outlet 32, the processed material outlet 32 comprises a first processed material (dry material) outlet 321 for discharging the processed material out of the system and a second processed material recycling outlet 322 for recycling the processed material, and the second processed material recycling outlet 322 is connected with a metering conveyor 13 for controlling the using amount of the material to be recycled; the biomass processing system in fig. 1 further comprises a mixer 1 for mixing the materials to be processed and a conveyor 2 connected to the mixer for conveying the mixed materials to be processed to the dryer, wherein the dry materials quantitatively back-mixed by the metering conveyor 13 can enter the mixer 1 together with the wet materials. In the biomass processing system, a material to be processed (wet material) firstly enters a mixer 1, when the water content of the material to be processed is more than 3%, the wet material and a quantitative back-mixed dry material are mixed in the mixer, if the water content of the material to be processed is less than 3%, the quantitative back-mixed dry material is not needed, the water content of the mixed material after mixing in the mixer 1 is generally lower than 10%, the mixed material is conveyed by a conveyor 2 to enter a drier 1 for drying, the material is heated (the moisture evaporation system provides heat energy for heat exchange), the material is dried in a rolling way and moves to the rear end, and after the drying is finished, the dry material is discharged from a first processed material (dry material) outlet 321 or the second processed material circulating outlet 322 is quantitatively back-mixed by a metering conveyor 13.
The moisture evaporation system comprises inert gas used for bringing moisture out of biomass and controlling oxygen content in the whole system, a fan 10 used for pressurizing the inert gas and a heater 12 used for heating the inert gas, the inert gas is pressurized and heated, then enters the dryer from the tail end of the dryer and is in direct contact with a material to be treated so as to bring away the moisture in the biomass, the inert gas carries moisture and then is discharged from the head end of the dryer and enters a dust remover 6 for dust removal, the gas after dust removal is discharged from the top of the dust remover 6 and enters a spray tower 7 communicated with the top of the dust remover 6 for spraying, the sprayed gas is discharged from the top of the spray tower and enters a pipeline communicated with the fan for reutilization or is discharged out of the system, the sprayed liquid enters a cooler 9 from the bottom of the spray tower through a spray pump 8 for heat exchange cooling, and the cooled liquid is discharged from the tail end of the cooler 9. The cooler 9 performs heat exchange cooling on the liquid through a second heat exchange system, and the second heat exchange system comprises a cold water inlet 91 arranged at the tail end of the cooler 9, a second heat exchange pipeline 92 arranged in the cooler, and an outlet 93 positioned at the head end of the cooler.
The inert gas can be any other gas which can be used for pumping water out of the material to be treated, such as inert gas, in this case, inert nitrogen is preferred, the inert gas has the function of controlling the oxygen content in the whole system besides being used for carrying away water in the material to be treated (wet material), the oxygen content in the water evaporation system is controlled within 12% by adjusting the input amount of the nitrogen (or other inert gases), the temperature of the nitrogen after being heated is about 100-160 ℃, preferably 10-150 ℃, and the evaporation of the water in the biomass residue is facilitated after the inert nitrogen is heated and the material to be treated is contacted.
The heat exchange system comprises a heat exchange pipeline 4 and hot steam, wherein the heat exchange pipeline 4 and the hot steam are arranged in the dryer, the hot steam enters the heat exchange pipeline 4 from the tail end of the dryer through a rotary joint and is in indirect contact with the material to be treated to exchange heat, so that moisture in the material to be treated is evaporated in an accelerated manner, and the hot steam is cooled into steam condensate after the heat exchange is finished and flows out. The hot steam flows in the heat exchange pipeline and indirectly contacts with the substance to be treated (wet substance) in the dryer to exchange heat so as to evaporate the moisture of the substance to be treated, thereby achieving the aim of drying.
Claims (9)
1. A biomass residue drying system is characterized in that the system comprises
The biomass processing system comprises a dryer for drying materials, the dryer comprises a material inlet to be processed and a processed material outlet, the processed material outlet comprises a first processed material outlet for discharging the processed materials out of the system and a second processed material circulating outlet for quantitatively back-mixing the processed materials, and the second processed material circulating outlet is connected with a metering conveyor for controlling the using amount of the materials to be back-mixed;
the moisture evaporation system comprises inert gas used for taking out moisture in the biomass and controlling the oxygen content in the whole system, a fan used for pressurizing the inert gas and a heater used for heating the inert gas, the inert gas enters the dryer from the tail end of the dryer after being heated and is directly contacted with the material to be treated so as to take away the moisture in the biomass, and the inert gas is discharged from the head end of the dryer after carrying the moisture;
the heat exchange system comprises a heat exchange pipeline and hot steam, the heat exchange pipeline and the hot steam are arranged in the dryer, the hot steam enters the heat exchange pipeline from the tail end of the dryer to indirectly contact with the material to be treated for heat exchange, and the hot steam is discharged after the heat exchange is finished.
2. The biomass residue drying system of claim 1, wherein the biomass processing system further comprises a mixer for mixing the materials to be processed and a conveyor connected to the mixer for conveying the mixed materials to be processed to the dryer.
3. The biomass residue drying system of claim 1, wherein the inert gas is inert nitrogen.
4. The biomass residue drying system according to claim 1, wherein the moisture evaporation system further comprises a dust remover communicated with the head end of the dryer and a spray cooler communicated with the top of the dust remover, the inert gas carrying moisture is discharged from the head end of the dryer and enters the dust remover for dust removal, the gas after dust removal is discharged from the dust remover and enters the spray cooler for spray cooling and then is discharged, and the spray cooler is communicated with the fan.
5. The biomass residue drying system of claim 4, wherein the spray cooler comprises a spray tower in communication with the top of the dust collector and a cooler in communication with the bottom of the spray tower, the rear end of the cooler being in communication with the top of the spray tower.
6. The biomass residue drying system of claim 5, wherein the cooler cools the liquid by a second heat exchange system comprising a cold water inlet at the aft end of the cooler, a second heat exchange line in the cooler, and an outlet at the forward end of the cooler.
7. The biomass residue drying system of claim 4, wherein the dust collector is a cyclone, a bag-type dust collector, or a combination thereof.
8. The biomass residue drying system of claim 1, wherein the heat exchange tubes are arranged concentrically within the dryer.
9. The biomass residue drying system of claim 1, wherein the dryer is a steam rotary dryer, a paddle dryer or a disk dryer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211270735.7A CN115682664A (en) | 2022-10-18 | 2022-10-18 | Biomass residue drying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211270735.7A CN115682664A (en) | 2022-10-18 | 2022-10-18 | Biomass residue drying system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115682664A true CN115682664A (en) | 2023-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211270735.7A Pending CN115682664A (en) | 2022-10-18 | 2022-10-18 | Biomass residue drying system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102199464A (en) * | 2010-03-24 | 2011-09-28 | 天华化工机械及自动化研究设计院 | Drying and water-recovering process of heat conduction coal by venturi injecting circulation of tail gas with low oxygen content |
| CN103160301A (en) * | 2013-03-21 | 2013-06-19 | 何建祥 | Low-temperature carbonization apparatus and method for oil sand, oil sludge, oil shale and biomass |
| CN203310203U (en) * | 2013-05-28 | 2013-11-27 | 山东科院天力节能工程有限公司 | Ammonium sulfate drying system |
| CN110207484A (en) * | 2019-06-06 | 2019-09-06 | 胡彬 | Dry materials boil-off gas cyclic utilization system and method |
| CN211436522U (en) * | 2019-12-02 | 2020-09-08 | 广东省工程技术研究所 | Biomass material is with smashing drying machine |
| CN114748879A (en) * | 2022-05-11 | 2022-07-15 | 天华化工机械及自动化研究设计院有限公司 | Large-scale spray drying system of organic solvent nitrogen gas closed cycle |
-
2022
- 2022-10-18 CN CN202211270735.7A patent/CN115682664A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102199464A (en) * | 2010-03-24 | 2011-09-28 | 天华化工机械及自动化研究设计院 | Drying and water-recovering process of heat conduction coal by venturi injecting circulation of tail gas with low oxygen content |
| CN103160301A (en) * | 2013-03-21 | 2013-06-19 | 何建祥 | Low-temperature carbonization apparatus and method for oil sand, oil sludge, oil shale and biomass |
| CN203310203U (en) * | 2013-05-28 | 2013-11-27 | 山东科院天力节能工程有限公司 | Ammonium sulfate drying system |
| CN110207484A (en) * | 2019-06-06 | 2019-09-06 | 胡彬 | Dry materials boil-off gas cyclic utilization system and method |
| CN211436522U (en) * | 2019-12-02 | 2020-09-08 | 广东省工程技术研究所 | Biomass material is with smashing drying machine |
| CN114748879A (en) * | 2022-05-11 | 2022-07-15 | 天华化工机械及自动化研究设计院有限公司 | Large-scale spray drying system of organic solvent nitrogen gas closed cycle |
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