CN101838952B - Biogas hot-air paper board drying system - Google Patents
Biogas hot-air paper board drying system Download PDFInfo
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- CN101838952B CN101838952B CN2010101702963A CN201010170296A CN101838952B CN 101838952 B CN101838952 B CN 101838952B CN 2010101702963 A CN2010101702963 A CN 2010101702963A CN 201010170296 A CN201010170296 A CN 201010170296A CN 101838952 B CN101838952 B CN 101838952B
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Abstract
The invention discloses a biogas hot-air paper board drying system. An air outlet of a biogas combustor is connected to the inside of a buffer balance tank, an outlet on the upper part of the buffer balance tank is connected with a temperature-adjusting room, an outlet of the temperature-adjusting room is connected with a booster fan, air is transferred to a hot air dryer by an air outlet of the booster fan, a pipeline between the temperature-adjusting room and the booster fan is provided with a temperature sensor, the temperature value of the pipeline is transferred to an actuator of an electric control valve by the temperature sensor, and air quantity entering the temperature-adjusting room is controlled by the opening degree of the electric valve. The system has the advantages of improving the conventional paper drying rate and improving the labor productivity.
Description
Technical field
The present invention relates to environmental project, regenerative resource and papermaking engineering field, particularly biogas hot-air paper board drying system.
Background technology
Utilize the anaerobic organism technical finesse to contain the organic pollution waste water and the solid waste of (representing with COD and BOD usually), can be converted into biogas to these organic pollutions, thereby also eliminate the pollution of waste water.Biogas has reduced the use of fossil fuel as the production and the utilization of the alternative energy, thereby has realized greenhouse gases CO
2Reduction of discharging.
Waste water of paper mill belongs to the organic wastewater of high concentration, adopts the anaerobic waste water biological treatment can produce considerable biogas.These biogas utilize on the spot, are the recycling of waste water and the effective measures of energy-saving and emission-reduction.
Biogas can be used for generating or burn at boiler.But owing to reasons such as scale, investments, marsh gas power generation is for some paper mills convenience not often.
Biogas can also be used for boiler combustion and produce steam, and steam is the traditional approach of paper mill paper dryer as thermal source.The saturated vapor of certain pressure is introduced into " drying cylinder " (drier of cylindrical hollow), drying cylinder has smooth minute surface, and paper is tightly wrapped up by canvas and is close to dryer surface, travels forward with the rotation of drying cylinder, the vapour transmission drying cylinder transfers heat on the paper, finishes dry run.Biogas can import boiler in order to produce steam, and still, two reasons cause the efficient of steam drying lower.At first, in the later stage of paper dryer, paper inside moisture to be evaporated, think that from dryer surface the rate of heat transfer of paper inside is crucial.But this moment paper surface the fiber of drying be heat non-conductor, cause the thermal efficiency very low, this situation is especially serious for the drying of cardboard.Secondly, with biogas production steam, and then with the process of steam drying paper, hot loss is through two links, and the thermal efficiency successively decreases bigger.
Summary of the invention
The present invention proposes a kind of biogas hot-air paper board drying system, the biogas that the waste water that utilizes paper mill itself produces with anaerobic bio-treated utilize mode, the high-temperature gas that promptly utilizes the biogas burning to produce comes the convection drying paper.The mode of this biogas utilization, simple and easy to do, efficiency of utilization is higher.And because the paper mill is production continuously in 24 hours, the biogas of generation can use at any time, has removed the requirement of biogas to big capacity bunkerage from, and is simple and easy to do.
Technical scheme of the present invention is achieved in that the air outlet of biogas burner is connected in the cushioning balance jar, the outlet of cushioning balance jar top is connected to tempering room, the outlet of tempering room connects booster fan, the air outlet of booster fan is kept watch and is delivered to hot-air drier, mounting temperature sensor on the pipeline between tempering room and the booster fan, the temperature of pipeline is sent to the executing agency of electric control valve by temperature sensor, enters the air quantity of tempering room by the open degree control ozone of this electrically operated valve.
Biogas is after Waste Water Treatment produces, through preprocessing process such as super-dry, desulfurization, enter the biogas burner burning, suddenly big or suddenly small and the flame-out generation of firepower that causes for the fluctuation that prevents to burn, except biogas burner is provided with automatic ignition device, the present invention has added a cushioning balance jar, uses so that the flow of biogas is more stable.The storage of it and biogas has the difference of essence, one, and his volumetric ratio hold-up tank is much smaller, and effect is just as the buffering of pressure and flow; Its two, it is a relation in parallel with burner, rather than the series system as the hold-up tank.
Stable rate of drying is that paper machine at a high speed is needed, and for this reason, the present invention is provided with the temperature that a tempering room is regulated biogas hot-air, and adopts fresh air to regulate hot blast.Needed temperature is determined according to the requirement of paper technology or the moisture of finished product paper, controls the control valve of air by the temperature sensor that is located on the hot-blast outlet pipe, thereby makes hot blast be adjusted to the temperature of requirement.
The outlet of temperature control valve (TCV) is connected with booster fan, and the effect that increases blower fan has two, 1) make combustion chamber and tempering room keep certain negative pressure, and suck air; Penetration power when 2) pressure of raising hot blast is with drying.Booster fan is delivered to the spray hot wind drier with hot blast, and hot blast is directly injected to paper surface between the drying cylinder via ejector dryer.The saturating power of the biography that hot blast with pressure has has improved the diffusion rate of convection heat transfer' heat-transfer by convection and humid air.
Hood is arranged above drying cylinder, and this is the facility that the paper mill all has, and its effect is to collect the humid air that contains steam, and its discharge is outdoor, and common exhaust hood links to each other with exhaust blower.Humid air has higher temperature, its be discharged into outdoor before, a heat exchanger is set, increase the air themperature that biogas burning needs in order to recovery waste heat, improve the thermal efficiency.
The present invention can produce following technique effect by above device: (1) improves paper traditional drying speed, thereby raises labour productivity; A kind of biogas utilization mode of (2) providing convenience, investment is saved for papermaking enterprise, the reduction of discharging of realization greenhouse gases and energy-conservation; (3) hot blast of generation temperature and constant flow is realized stable production; (4) efficiency of utilization of raising biogas.
Description of drawings
Fig. 1 cardboard biogas drying system schematic diagram; Below in conjunction with accompanying drawing content of the present invention is described in further detail.
The specific embodiment
Shown in accompanying drawing, the air outlet of biogas burner 1 is connected in the cushioning balance jar, the outlet of cushioning balance jar top is connected to tempering room 3, the outlet of tempering room 3 connects booster fan 6, the air outlet of booster fan 6 is kept watch and is delivered to hot-air drier 7, mounting temperature sensor 4 on the pipeline between tempering room 3 and the booster fan 6, the temperature of pipeline is sent to the executing agency of electric control valve 5 by temperature sensor, enters the air quantity of tempering room by the open degree control ozone of this electrically operated valve.
The biogas that the anaerobic bio-treated process of waste water produces contains 60% the methane of having an appointment.Biogas is sent into the biogas combustion system through after the preliminary treatment.Hot blast directly blows at paper surface through paper dryer, and the hot blast of certain pressure has penetration power, and the moisture of paper inside is taken away rapidly by the hot blast of high temperature drying.The mobile of hot blast changed into the much higher convection heat transfer' heat-transfer by convection of efficient to original drying cylinder to the conduction heat transfer of paper, and the higher temperature of the paper surrounding environment that the while hot blast brings reduces relative humidity, and the moisture diffusion speed in the paper improves greatly.Fundamentally changed the situation of paper dryer.This drying is particularly suitable for: the drying of (1) all kinds of cardboards can be used for back 1/3 position of the cylinder group of drying section; (2) drying of all kinds of coated papers, the drying after can being used to be coated with.
One of difficult point of hot-air drying process is that dry rate requirement is stable, so as the moisture content of product stable in the scope of paper quality standard permission and avoid the buckling deformation of the uneven paper that brings as early as possible.For this reason, the present invention proposes the hot blast feeding system and the simple surge tank of the control of temperature and air quantity.By this system, realize stable rate of drying.
In the paper-making process, paper forms wet web at the screen cloth of paper machine, make moisture be reduced to about 50-60% by press dewatering between forming table dehydration, roller etc. then after, enter the cylinder dried part.Paper then tightly is wrapped in the one group of dryer surface that has minute surface, along with the rotation of drying cylinder travels forward.The heat that paper absorbs the oven dry surface makes water evaporates, and steam is condensed into hot water and discharges in drying cylinder.
For thicker paper, after being dried to moisture 30%, its surface has been dry fiber, and at this moment, the thermal efficiency of cylinder dried significantly descends.Therefore the certain position between papermaking and many group drying cylinders is settled heated-air drying, and expection has effect preferably.Heated-air drying becomes convection heat transfer' heat-transfer by convection to the heat conduction, has greatly increased heat transfer efficiency.
In enforcement of the present invention, take cushioning balance jar and control valve to regulate the pressure and the flow of hot blast; Take the mode of feedback regulation to control the temperature of hot blast; And burning and the required air of temperature adjustment all by increase blower fan intake system in.
This patent can provide burning, automatic temperature control system is in the technology of one, promptly forms " the biogas hot-air generator of constant temperature " (part that dotted line comprises among Fig. 1), is used for the drying of paper.
Process and the rate of drying of principle paper in paper-making process depend on 1) rate of heat transfer of drying cylinder paper; 2) steam from paper surface to airborne mass transfer rate.
Dryer surface mainly is conduction to the heat transfer type of paper web in the papermaking moisture drying process, and conduction velocity depends on the thermal conductivity factor of paper, and when paper surface had moisture, thermal conductivity factor was bigger, and the transmission of heat is very fast relatively.When the water evaporates of paper to the 20-30% interval, the fiber that almost all is dried of paper surface occupies, moisture mainly is present in the inside of paper.This moment is because dry fiber is the non-conductor of heat, so heat-transfer effect is very poor, and drying enters the difficulty stage.
In addition, steam is the flow regime of surrounding air and the relative humidity around the paper from the speed of paper surface diffusion in the evaporation.Under one situation, around the drying cylinder relative humidity very big.
The high-temperature hot-air that heated-air drying is brought solves the problem of this two aspect just: 1) compulsory convection heat transfer' heat-transfer by convection is changed in the conduction heat transfer of poor efficiency; 2) hot blast has improved the temperature of air, thereby greatly reduces the relative humidity around the paper.Because hot blast has strengthened flowing of air, therefore also improved the mass transfer rate of hot-air effectively in addition to air.Just because of this, rate of drying must improve.
When paper machine dryer was dry usually, the baking temperature of paper was between 80-100 ℃.The temperature of biogas burning can reach the temperature near 2000 ℃, so the adjusting of temperature mainly is to reduce temperature.Required air capacity can be set according to the needs of paper machine easily.
Claims (1)
1. biogas hot-air paper board drying device, it is characterized in that, the air outlet of biogas burner (1) is connected in the cushioning balance jar (2), the outlet of cushioning balance jar (2) top is connected to tempering room (3), the outlet of tempering room (3) connects booster fan (6), the air outlet of booster fan (6) is kept watch and is delivered to hot-air drier (7), mounting temperature sensor (4) on the pipeline between tempering room (3) and the booster fan (6), the temperature of pipeline is sent to the executing agency of electric control valve (5) by temperature sensor, enters the air quantity of tempering room by the open degree control ozone of this electrically operated valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101702963A CN101838952B (en) | 2010-05-12 | 2010-05-12 | Biogas hot-air paper board drying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101702963A CN101838952B (en) | 2010-05-12 | 2010-05-12 | Biogas hot-air paper board drying system |
Publications (2)
| Publication Number | Publication Date |
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| CN101838952A CN101838952A (en) | 2010-09-22 |
| CN101838952B true CN101838952B (en) | 2011-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010101702963A Expired - Fee Related CN101838952B (en) | 2010-05-12 | 2010-05-12 | Biogas hot-air paper board drying system |
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| CN (1) | CN101838952B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102977962A (en) * | 2012-11-14 | 2013-03-20 | 安徽山鹰纸业股份有限公司 | Recovery power generation technology of methane generated by paper-making wastewater treatment |
| EP2826916B1 (en) * | 2013-07-16 | 2017-08-30 | Valmet Technologies, Inc. | Dryer structure for a pulp making process, control system for a dryer and method for a dryer |
| DE102018003969A1 (en) * | 2018-05-16 | 2019-11-21 | Meri Environmental Solutions Gmbh | Method and device for drying preferably a moving material web with at least one biogas-heated drying device |
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2010
- 2010-05-12 CN CN2010101702963A patent/CN101838952B/en not_active Expired - Fee Related
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| CN101838952A (en) | 2010-09-22 |
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Granted publication date: 20111116 Termination date: 20180512 |