CN203024560U - Closed-type wood fiber drying system - Google Patents
Closed-type wood fiber drying system Download PDFInfo
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- CN203024560U CN203024560U CN 201220717815 CN201220717815U CN203024560U CN 203024560 U CN203024560 U CN 203024560U CN 201220717815 CN201220717815 CN 201220717815 CN 201220717815 U CN201220717815 U CN 201220717815U CN 203024560 U CN203024560 U CN 203024560U
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Abstract
A closed-type wood fiber drying system belongs to the wood processing field. The closed-type wood fiber drying system is characterized in that an ambient air inlet is connected with a heat exchanger, a centrifugal fan and a wet fiber inlet are connected with the initial end of a drying pipeline, the tail end of the drying pipeline is connected with an inlet of a cyclone separator, the cyclone separator comprises a discharging port and an exhaust port, the exhaust port is connected with a dust removal device, the dust removal device is connected with an aldehyde removal device, the rear side of the aldehyde removal device is connected with a dehumidifying device and a bypass valve in parallel, the dehumidifying device is connected with a water outlet, and the dehumidifying device and the bypass valve are jointly connected to the heat exchanger; or the dehumidifying device is also provided with an evaporator, and the evaporator, a compressor, a condenser and an expansion valve form a closed-type refrigerating cycling system. Compared with an open-type wood fiber drying system, the closed-type wood fiber drying system can improve the uniformity of the wood fiber drying moisture content, improve the heat utilization efficiency and can reduce the emission of pollutants.
Description
Technical field
The utility model relates to a kind of wood fibre drying system, relates in particular to a kind of closed wood fibre drying system.
Background technology
The medium density fibre board (MDF) industry is the comprehensive utilization of resources industry, is again Resource Dependence type industry, is also the industry that energy consumption is relatively high.Heat energy is one of main form of energy consumed in Fibreboard Production, and the fiber drying hear rate accounts for consumable 54% [the Jingge Li. Modeling of Thermal Energy Demand in MDF Production. Forest Products Journal of total heat, 2007,57 (9): 97-104.], fiber drying is the master operation of thermal energy consumption, directly determining the energy consumption in the Fibreboard Production process, is the energy-saving and cost-reducing key link of medium-density fiberboard production line.
Along with the progress of technology, drying process is also being constantly updated, by original secondary drying technique to current single-stage drying process; The single-stage drying process, again from original high temperature drying technological development low temperature drying technology up till now, makes the wood fibre drying improve constantly the utilization ratio of the energy under the prerequisite that guarantees dry mass.
Improving the efficiency of energy utilization technical elements, applying more is that boiler exhaust gas is sent into to drying duct with air-introduced machine after the secondary cyclone dedusting, increases drying duct intake air initial temperature, to reach energy-saving and cost-reducing purpose; As practical new patent " a kind of low temperature drying device of the wood fibre " (patent No.: directly apply to fiber drying after just adopting boiler exhaust gas to purify CN200920140922_7) and carried out application preferably, improved the total utilization efficiency of heat energy of enterprise.
Although fiber drying technique is along with technological progress, make efficiency of utilization more and more higher, but exist all the time the common feature that fiber drying tail gas is directly entered to atmosphere, comprise the material that a large amount of dust, fine fibre, formaldehyde etc. are harmful to health in the gas of discharge, the Industry Waste tolerance that the national Pollutant source investigation industrial pollution source for the first time carried out as national environmental protection section in 2008 produces contained medium density fibre board (MDF) in " timber processing and bamboo rattan palm fibre straw-made articles industry industry are produced the discharge coefficient service manual " of discharge coefficient in adjusting is 14000m
3/ m
3plate, the industrial dust amount is 106.55kg/m
3plate, wherein all directly entered atmospheric environment more than 90%; The gas temperature of discharge is higher in addition, and environment is caused to larger environmental pollution and thermal pollution.
The utility model content
The technical problems to be solved in the utility model is to overcome the deficiencies in the prior art, provide a kind of less on existing production line impact, can effectively reduce environmental emission, and improve the method for fiber drying efficiency of utilization and dry mass.
For solving the problems of the technologies described above, the technical scheme the utility model proposes is a kind of closed wood fibre drying system, comprise air preheat, fiber drying, exhaust dust-removing processing, aldehydes removal processing and dehumidification treatments part, it is characterized in that the emission gases of fiber drying is carried out to closed processing.
A kind of closed wood fibre drying means, it is characterized in that applying with lower device: ambient air inlet connects heat exchanger, centrifugal fan is connected the initial end of drying duct with the wet fiber entrance, the drying duct end connects the import of cyclone separator, cyclone separator includes discharging opening and exhaust outlet, exhaust outlet connects dust arrester, dust arrester connects the aldehydes removal device again, be parallel with dehydrating unit and by-passing valve after the aldehydes removal device, dehydrating unit is connected to delivery port, jointly accesses heat exchanger after dehydrating unit and by-passing valve again;
Perhaps in dehydrating unit, also be provided with evaporimeter, and evaporimeter, compressor, condenser and expansion valve form an enclosed refrigeration circulatory system.
Above-mentioned enclosed fiber drying system comprises following a few part:
(1) fiber drying part, be dried to wet fiber in the fiber drying device of the dry fiber that meets medium density fibre board (MDF) manufacturing technique requirent moisture content, comprises the devices such as air preheat, fiber drying and fiber separation;
(2) dust arrester, contained dust-filtering in the humid air that will discharge from cyclone separator;
(3) aldehydes removal device, remove contained free formaldehyde in humid air;
(4) dehydrating unit, below exhaust temperature is reduced to the dew-point temperature corresponding states, make moisture with the form of the aqueous water system of freeze-outing the temperature of humid air, thereby reduce the humidity in humid air;
(5) UTILIZATION OF VESIDUAL HEAT IN, be beneficial in production absorbing heat in dehumidification process again, rather than be thrown in environment.
Utilization due to technique scheme, the utility model compared with prior art has the following advantages: the dried humid air of wood fibre again is applied in the wood fibre drying after dust removal process, aldehydes removal processing and dehumidification treatments, the moist air state that fiber drying is used is stable, after fiber drying, moisture content is stable, and effectively avoided discharging pollutants in atmosphere, also waste heat is fully recycled, improved energy utilization efficiency, reached the purpose of energy-saving and emission-reduction.Technical feasible, the technological transformation of existing production line also is easier to, can in the situation that do not destroy current production line and transformed, be a kind of fiber drying method with better prospect.
The accompanying drawing explanation
The open wood fibre drying system of Fig. 1 sketch
The closed wood fibre drying system of Fig. 2 sketch (embodiment 1)
The closed wood fibre drying system of Fig. 3 sketch (embodiment 2)
1 ambient air inlet 2 heat exchanger 3 centrifugal fan 4 wet fiber entrance 5 fiber drying pipeline 6 cyclone separator 7 discharging opening 8 exhaust outlet 9 deduster 10 aldehydes removal device 11 dehydrating unit 12 discharge outlet 13 dehumidifying sender property outlet 14 dehumidifying working medium entrance 15 by-passing valve 16 evaporimeter 17 compressor 18 condenser 19 expansion valves.
The specific embodiment
A kind of closed wood fibre drying system, it is characterized in that: ambient air inlet 1 connects heat exchanger 2, centrifugal fan is connected the initial end of drying duct 5 with wet fiber entrance 4, drying duct 5 ends connect the import of cyclone separator 6, cyclone separator includes discharging opening 7 and exhaust outlet 8, exhaust outlet 8 connects dust arrester 9, dust arrester 9 connects the aldehydes removal device again, be parallel with dehydrating unit 11 and by-passing valve 13 after the aldehydes removal device, dehydrating unit is connected to delivery port 12, jointly accesses heat exchanger 2 after dehydrating unit and by-passing valve again;
Perhaps in dehydrating unit 11, also be provided with evaporimeter 16, and evaporimeter 16, compressor 17, condenser 18 and expansion valve 19 form an enclosed refrigeration circulatory system.
Apply the method for described a kind of closed wood fibre drying system, it is characterized in that: dry required humid air enters heat exchanger 2 by ambient air inlet 1, humid air after heat exchanger 2 heats up, enter drying duct 5 after centrifugal blower 3, the wet fiber that is dried arrives cyclone separator 6 by dried fiber separation and discharges discharging opening 7 after wet fiber entrance 4 enters drying duct 5, dried humid air enters dust arrester 9 by exhaust outlet 8, the fine fibre and the dust that for removing the discharge humid air, comprise, humid air after dedusting enters aldehydes removal device 10, after decomposing free formaldehyde wherein, part humid air enters dehydrating unit 11, condensate water after dehumidifying is from discharge outlet 12 discharge systems, when perhaps a part of humid air passes through the evaporimeter 16 of dehydrating unit 11, moisture in humid air condenses rapidly and is discharged by delivery port 12, thereby reduce the moisture of humid air, heat in humid air cooled working medium absorbs, make the refrigeration working medium evaporation, after compressed machine 17 compressions, temperature is increased to the condensation temperature under corresponding pressure, at condenser 18 places, heat is discharged again to the humid air through dehumidifying, and entering evaporimeter after expansion valve 19 again, refrigeration working medium carries out next cyclic process,
Another part humid air carries out next dry cycle process again through after by-passing valve, with humid air after dehumidifying, entering heat exchanger 1 after mixing.
Open type wood fibre drying system (example) brief introduction:
Figure 1 shows that traditional open type wood fibre drying system, basic condition: produce 40000 m per year
3the fiber drying system that medium-density fiberboard production line is supporting, dry required humid air is all entered by ambient air inlet 1, after heat exchanger 2 heats up, obtains the humid air that temperature is 143 ℃, through centrifugal blower 3(air quantity, is 115000m
3/ hr, blast is 4000Pa) send into drying duct 5; The wet fiber that moisture content is 60% is spurted into drying duct 5 through wet fiber entrance 4, after the drying duct 5 of the nearly 90m of total length, the moisture content of fiber reaches 9% left and right, wood fibre arrives after cyclone separator 6 fiber separation and is settled down to discharging opening 7, dried humid air directly enters atmosphere by exhaust outlet 8, the temperature of humid air is 55 ℃, relative humidity is 70% left and right, and wind speed is between 10-20m/s.Year discharge humid air institute heat content reaches 74.8 * 10
6mJ, and discharge in humid air and contain a large amount of formaldehyde, dust (fine fibre, dust etc.) and a large amount of moisture, surrounding air is caused to certain pollution, and has lost a large amount of heats and moisture, wasted a large amount of energy and water resource.The wood fibre drying system is an open system, by the ambient atmosphere environment introduce all need to humid air, dried humid air is drained in ambient air again.
Embodiment 1:
By the utility model design, production line is undergone technological transformation to rear schematic diagram as shown in Figure 2, become closed wood fibre drying system.Connected dust arrester 9 after the exhaust outlet 8 of cyclone separator 6, adopted the honeycomb fashion dedusting, the fine fibre and the dust that comprise for removing the discharge humid air, connect the aldehydes removal device after dust arrester, adopt TiO
2/ ZnO Degradation Formaldehyde purification techniques, decompose the free formaldehyde in humid air to remove, connect dehydrating unit after the aldehydes removal device, dehumidifying working medium in this example is enterprise's running water, water temperature is between the 15-20 degree, dew-point temperature (55 ℃/relative humidity of humid air temperature, 70% corresponding dew-point temperature is about 46 ℃) far below humid air, the normal temperature running water is entered by dehumidifying working medium entrance 14, by the hydrogenesis in humid air out and through discharge outlet 12 discharge systems, running water after the absorption heat connects boiler water inlet systems through dehumidifying sender property outlet 13, can make water temperature improve 15 ℃, the supporting boiler capacity of production line is about 15 tons/hr, annual recyclable total amount of heat is 6.8 * 10
6mJ, be equivalent to the annual 232 tons of standard coals (standard coal caloric value 29.3076MJ/kg) of saving, thereby saving amount of heat, the ratio of bypass humid air can be adjusted by the aperture of by-passing valve 15, through the air of dehumidifying with enter again heat exchanger 2 after part humid air through by-passing valve mixes, enter next fiber drying process.When this part enthalpy of moist air reclaimed is not enough, can introduces surrounding air by ambient air inlet 1 and be supplemented.Owing to being closed circulation system, the more original open system of system operation is stablized, and after fiber drying, moisture content can be stabilized between 7.5 ~ 9.5%.And the dry required air of traditional open type wood fibre drying system is all entered by surrounding air, and that surrounding air is subject to climatic effect is larger, temperature, the moisture fluctuation of air are larger, as In Nanning Area daytime temperature in October at 30 ℃, relative humidity in 50% left and right, and nocturnal temperature at 20 ℃, relative humidity in 90% left and right, when other condition is constant, can cause fiber drying after moisture content between 7 ~ 10.5%, fluctuate, uniformity is poor.
Embodiment 2:
By the utility model design, production line is undergone technological transformation to rear schematic diagram as shown in Figure 3.The difference of the present embodiment and embodiment 1 only is dehumidifying and the UTILIZATION OF VESIDUAL HEAT IN part of humid air.The present embodiment adopts the form of heat pump dehumidifying, by evaporimeter 16, compressor 17, condenser 18 and expansion valve 19, forms an enclosed refrigeration circulatory system, and refrigeration working medium is flowing in connecting line.When the process dedusting, when the humid air after aldehydes removal passes through the evaporimeter 16 of dehydrating unit 11, due to the surface temperature of evaporimeter at 5-10 ℃, far below the humid air dew-point temperature (55 ℃/relative humidity of humid air temperature, 70% corresponding dew-point temperature is about 46 ℃) under state at that time, make the moisture in humid air condense rapidly and discharge system by condensate draining pipe, thereby reduce the moisture of humid air, heat in the humid air refrigeration working medium in cooled system absorbs, make the refrigeration working medium evaporation, after compressed machine 17 compressions, temperature is increased to the condensation temperature (being about 75 ℃) under corresponding pressure, at condenser 18 places, heat is discharged again to the humid air through dehumidifying (that is: after dry, discharge in humid air remove moisture in institute's heat content all return to again drying system), and entering evaporimeter after expansion valve 19 again, refrigeration working medium carries out next cyclic process.Through the humid air of dehumidifying and heating with again enter heat exchanger 2 after humid air through by-passing valve 15 mixes, enter next dry cycle.When if this part enthalpy of moist air reclaimed is not enough, can introduces surrounding air by ambient air inlet 1 place and be supplemented.
Owing to being closed circulation system, the more original open system of system operation is stablized, and after fiber drying, moisture content can be stabilized between 7.5 ~ 9.5%.And the dry required air of traditional open type wood fibre drying system is all entered by surrounding air, and that surrounding air is subject to local climate impact is larger, temperature, the moisture fluctuation of air are larger, as In Nanning Area daytime temperature in October at 30 ℃, relative humidity in 50% left and right, and nocturnal temperature at 20 ℃, relative humidity in 90% left and right, when other condition is constant, can cause fiber drying after moisture content between 7 ~ 10.5%, fluctuate, uniformity is poor.
Claims (1)
1. a closed wood fibre drying system, it is characterized in that: ambient air inlet connects heat exchanger, centrifugal fan is connected the initial end of drying duct with the wet fiber entrance, the drying duct end connects the import of cyclone separator, cyclone separator includes discharging opening and exhaust outlet, exhaust outlet connects dust arrester, dust arrester connects the aldehydes removal device again, be parallel with dehydrating unit and by-passing valve after the aldehydes removal device, dehydrating unit is connected to delivery port, jointly accesses heat exchanger after dehydrating unit and by-passing valve again;
Perhaps in dehydrating unit, also be provided with evaporimeter, and evaporimeter, compressor, condenser and expansion valve form an enclosed refrigeration circulatory system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220717815 CN203024560U (en) | 2012-12-21 | 2012-12-21 | Closed-type wood fiber drying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220717815 CN203024560U (en) | 2012-12-21 | 2012-12-21 | Closed-type wood fiber drying system |
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| CN203024560U true CN203024560U (en) | 2013-06-26 |
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| CN 201220717815 Expired - Fee Related CN203024560U (en) | 2012-12-21 | 2012-12-21 | Closed-type wood fiber drying system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107314658A (en) * | 2017-08-17 | 2017-11-03 | 文安县天华密度板有限公司 | A kind of novel wooden fiber multisection type flash drying method and apparatus |
| CN109198703A (en) * | 2018-11-07 | 2019-01-15 | 广州金鹏环保工程有限公司 | Environmental protection and energy saving zero waste gas emission expanded pellet diet production line and production method |
| CN110730895A (en) * | 2017-06-06 | 2020-01-24 | 道格拉斯科技有限公司 | Device and method for continuously drying bulk goods |
| CN111263569A (en) * | 2020-02-09 | 2020-06-09 | 苏州浪潮智能科技有限公司 | Refrigerating system of data center machine room |
-
2012
- 2012-12-21 CN CN 201220717815 patent/CN203024560U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730895A (en) * | 2017-06-06 | 2020-01-24 | 道格拉斯科技有限公司 | Device and method for continuously drying bulk goods |
| CN107314658A (en) * | 2017-08-17 | 2017-11-03 | 文安县天华密度板有限公司 | A kind of novel wooden fiber multisection type flash drying method and apparatus |
| CN109198703A (en) * | 2018-11-07 | 2019-01-15 | 广州金鹏环保工程有限公司 | Environmental protection and energy saving zero waste gas emission expanded pellet diet production line and production method |
| CN111263569A (en) * | 2020-02-09 | 2020-06-09 | 苏州浪潮智能科技有限公司 | Refrigerating system of data center machine room |
| CN111263569B (en) * | 2020-02-09 | 2021-07-27 | 苏州浪潮智能科技有限公司 | Refrigerating system of data center machine room |
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Legal Events
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130626 Termination date: 20201221 |
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| CF01 | Termination of patent right due to non-payment of annual fee |