The method of waste heat recovery in a kind of starchy material course of processing
The present invention relates to the method for waste heat recovery in a kind of starchy material course of processing, belong to starchy material saccharification technical field.
In recent years, China's starchy material deep processing has obtained fast development, is example with W-Gum matter resource, Tenth Five-Year Plan Period China's corn consumption from 1.27 hundred million tons of rising to 2005 of 1.12 hundred million tons in 2000, increase by 2.5% every year.2006 domestic corn consumption (not containing outlet) be 1.34 hundred million tons, increased by 5.5% than 2005; Wherein, deep processing consumes 3,589 ten thousand tons of corns, accounts for 26.8% of total quantity consumed, and proportion is firm rising tendency.These W-Gum matter resources are after deep processing or make Dian Fentang, polyvalent alcohol product, or make fermentation and use product, all need pass through liquefaction processing.
The quick growth of corn deep processing industry has positive effect to drive agricultural restructuring, quickening industrialization management.But; Working ability blind expansion, duplicate construction serious situation have also appearred in the corn deep processing industry in evolution in recent years; Newly-built, enlarging or projects awaiting construction add up to the production capacity rate of growth to substantially exceed the corn yield increasing degree; Cause investigation mission outside the city or town raw grain quantity to reduce, and had influence on the normal development of relevant industries such as feed processing, livestock culture.Country adjusts the corn processed industry policy for this reason.Successively issue guidance notes such as " about strengthening the urgent message of corn processed project construction management "; The corn processed project is limited, particularly, improved the industry access threshold the strict control of new reconstruction project; From the strict control of indexs such as corn consumption, energy consumption, water consumption; Purpose is to contain blindly too fast growth momentum of corn deep processing industry, avoids producing the phenomenon of striving grain with feedstuff industry, stabilizes the situation that present portioned product goes up because of corn price.
Therefore energy-saving and water-saving, reduction consume and just seem particularly important, and this not only meets national relevant policies, also are the needs that enterprise reduces the unit cost of production, enhances competitiveness.Tradition starchy material deep processing technology is that AMS is added high temperature liquefaction behind the starch, makes AMS fully interrupt starch chain, feeds cooling water temperature then, carries out saccharification again, and then is processed into Dian Fentang or various products are processed in fermentation.Because cooling water temperature is adopted in the liquefaction back, heat can't reclaim, and causes the great amount of heat energy waste, and production cost raises.Like publication number is the Chinese patent of CN1337471, discloses a kind of liquid submerged fermentation, and it is converted into liquefied starch, one step of saccharification liquid the method for dextrinosan; It is starch fluid liquefaction or saccharification with 20-35%; Add auxiliary materials such as peanut press pulp, steeping water, Semen Maydis powder, soybean cake powder, wheat bran, high-temperature sterilization, black mold or aspergillus oryzae liquid strain are inserted in the cooling back; 25-40 ℃ of fermentation 3 days; The fermentation end product is through gac, resin decolorization, and concentrating under reduced pressure promptly gets the product that dextrinosan content is 50-90%.
Thermal source when making full use of liquefying starchiness raw material heats the material that needs heating; Both accomplished the comprehensive utilization of thermal source; Reduced the cooling water amount that liquefier cooling saccharification needs again, met national energy-saving and emission-reduction requirement, great economic benefit and social benefit have been arranged.
Summary of the invention
To the deficiency of prior art, the present invention provides the method for waste heat recovery in a kind of starchy material course of processing, through starchiness liquefier waste heat being fully utilized the consumption of the energy and water resources in the minimizing starchiness sugaring process.
Technical scheme of the present invention is following:
The method of waste heat recovery in a kind of starchy material course of processing; The starchiness liquefier of boiling liquefaction is after the laminar flow insulation; Discharging vacuumizes cooling, obtains cooled starch matter liquefier, vacuumizes the secondary steam that obtains through heat-exchanger rig recovery waste heat and water of condensation.The secondary steam that reclaims can with the slip of the slip that needs evaporation concentration, steam ejection liquefaction or the slip of neutralization decolouring; And other slips in the starchy material sugaring etc. carry out heat exchange; Reclaim the water of condensation that generates in the heat exchanging process simultaneously, cooled starch matter liquefier can be proceeded saccharification and handle.
Preferably, said discharging after the laminar flow insulation is 50-80 ℃ at the boiling point of vacuum tank.Boiling point when boiling point is low excessively, needs to increase the energy consumption of vacuum pump by the decision of the vacuum tightness in the vacuum tank, and total power consumption increases; Boiling point is too high, can't reach the purpose of abundant recovery waste heat.
Preferably, described cooled starch matter liquefier temperature is 50-60 ℃.
Preferably, described discharging makes cooled starch matter liquefier after vacuumizing cooling.Through vacuumizing cooled starchiness liquefier temperature when being higher than 50-60 ℃, carry out the secondary cooling through secondary cooling apparatus when above-mentioned again, make feed temperature be cooled to suitable temp.
Preferably, the temperature of said discharging is 80-100 ℃.
The specific equipment of waste heat recovery in a kind of starchy material course of processing; It is arranged between the laminar flow jar and saccharifying tank of starchy material processing units, comprises vacuum tank, heat-exchanger rig and vacuum pump, and vacuum tank is provided with opening for feed, discharge port and air outlet; The opening for feed of vacuum tank links to each other with laminar flow jar discharge port through pipeline; The air outlet of vacuum tank is connected with heat-exchanger rig, and heat-exchanger rig links to each other with vacuum pump, and the discharge port of vacuum tank links to each other with saccharifying tank through pipeline.
Be provided with secondary cooling apparatus between described vacuum tank and the saccharifying tank.
Described secondary cooling apparatus is selected from plate-type heat exchanger, tubular heat exchange, coil heat exchanger or spiral-plate heat exchanger.
Described vacuum tank is arranged at the top of saccharifying tank.Vacuum tank is arranged at the higher position, helps the charging and the discharging of vacuum tank, and helps jar interior negative pressure state that keeps.
Beneficial effect of the present invention is following:
The present invention has not only improved product concentration through the starchiness liquefier after boiling is vacuumized cooling, has reduced concentrated expense, has reclaimed secondary steam simultaneously.Then secondary steam and other materials that need heat are carried out heat exchange, utilize the energy in the production process, the also recyclable utilization of the condensed water of condensation of secondary steam.So both improved liquefier concentration, reduced follow-up concentrated expense, and also reduced the consumption of water coolant, and made full use of the energy.Utilize this technology to carry out starchiness liquefaction production following positively effect arranged:
1, reduces the consumption of starchiness sugaring steam energy, and improve liquefier concentration, reduce follow-up concentrated expense.
2, reduce the consumption of starchiness sugaring water resources.
3, meet national resources, energy conservation requirement, reduce production costs.
Description of drawings
Fig. 1 is the process flow sheet in the starchy material course of processing.
Fig. 2 is the structural representation of waste heat recovery apparatus in the starchy material course of processing.
Wherein: 1, laminar flow jar, 2, vacuum tank, 3, heat-exchanger rig, 4, vacuum pump, 5, secondary cooling apparatus, 6, saccharifying tank.
Below in conjunction with embodiment the present invention is done further elaboration, but institute of the present invention protection domain is not limited thereto.
The method of waste heat recovery in a kind of starchy material course of processing; As shown in Figure 1, the starchiness liquefier of boiling liquefaction is after the laminar flow insulation, and drop temperature is in 80-95 ℃ of scope; Discharging is vacuumized cooling; At this moment, the starchiness liquefier boiling point in the vacuum tank is 60 ℃, vacuumizes the secondary steam that obtains and carries out heat exchange recovery waste heat and water of condensation through heat-exchanger rig and starch syrup to be evaporated.
Every production 1t Dian Fentang (dry weight) can be practiced thrift 20 ℃ about 10 tons of water coolant, saves about 0.25 ton of steam.Has high economic benefit.
Method like embodiment 1 described waste heat recovery; Difference is; Drop temperature is between 95-100 ℃, and the starchiness liquefier boiling point in jar is 65 ℃, and secondary steam carries out heat exchange recovery waste heat and water of condensation through heat-exchanger rig and starchy material to be heated.
Every production 1t Dian Fentang (dry weight) can be practiced thrift 20 ℃ about 14 tons of water coolant, saves about 0.5 ton of steam.Has high economic benefit.
The specific equipment of waste heat recovery in a kind of starchy material course of processing; As shown in Figure 2, it is arranged between the laminar flow jar 1 and saccharifying tank 6 of starchy material processing units, and is positioned at the top of saccharifying tank 6; Comprise vacuum tank 2, heat-exchanger rig 3 and vacuum pump 4; Vacuum tank 2 is provided with opening for feed, discharge port and air outlet, and the opening for feed of vacuum tank 2 links to each other with laminar flow jar 1 discharge port through pipeline, and the air outlet of vacuum tank 2 is connected with heat-exchanger rig 3; Heat-exchanger rig 3 links to each other with vacuum pump 4, and the discharge port of vacuum tank 2 links to each other with saccharifying tank 6 through pipeline.Be provided with secondary cooling apparatus 5 between vacuum tank 2 and the saccharifying tank 6, secondary cooling apparatus 5 is a plate-type heat exchanger.