CN87208581U

CN87208581U - Airflow dryer for starch powder

Info

Publication number: CN87208581U
Application number: CN 87208581
Authority: CN
Inventors: 于吉云
Original assignee: Institute Of Food Machinery Caams
Current assignee: Institute Of Food Machinery Caams
Priority date: 1987-06-01
Filing date: 1987-06-01
Publication date: 1988-09-07

Abstract

The utility model discloses a two-stage airflow dryer for drying starch powder (powder materials), which can realize the full recovery utilization of the waste gas residual heat of the finished product cyclone and the clamping belt starch through adopting the allocating and adjusting device of the hot wind and two-stage air-current flow path combined with the positive-pressure air-current and the negative-pressure air-current. The heat efficiency is as high as 84%; when the moisture is evaporated for 1 kilogram, the steam can be consumed for 1.45 kilograms (723 calories); the heat energy can be saved more than 20%; when the starch is dried for 1 ton, the coal can be saved for about hundreds of jin. The finished product starch can be emitted and a wet dust remover can recover the starch in the exhaust waste gas through adopting a negative-pressure airflow drying section, the flying off loss is less, and the recovering quantity of the starch can be increased by 0.2%.

Description

Airflow dryer for starch powder

The utility model belongs to starch (powder) drying plant.

The utility model goes up two single-stage dryer placed in-line two-stage airflow drying units of disclosed Shanghai starch factory than the 14th page to the 16th page of " drying technology progress " book the third volume of a work air stream drying and the placed in-line two-stage airflow dryer of malleation air-flow of Shanghai pharmaceutical excipient factory develops to some extent.

In disclosed two kinds of two-stage airflow dryers, preceding a kind of two-stage dryer has two cover well heaters, feeder, blower fan, cyclone, wet dust catcher, pipeline and annex etc., need two complete equipments, investment is many, complicated operation, but reliable operation, apply more, as some starch factories of ground such as Jiangxi east wind pharmaceutical factory, Red Star cultivation farm, the North Sea, Guangxi starch factory and Shanghai; A kind of two-stage airflow dryer in back, only, utilize waste gas residual heat that wet starch is given drying, the heat utilization efficiency height with a cover well heater, feeder, blower fan, wet dust catcher, two cover cyclone, two circuits and annexes etc., but waste-gas heat deficiency, moisture vapor is more, when giving heat conveying starch, condenses in easily on cryogenic object and the wall, cause starch to glue wall, line clogging, thereby the normal cleaning that stops production influence the productivity performance.Reduce (35%) although adopted the methods and requirements wet starch of part dry starch reflux cycle to contain moisture as far as possible, utilize 55 waste gas residual heats of spending can't the wet starch that contain moisture 40% cannot not to be dried to stickingly the degree of wall.Adopt the circulation of part dry starch, exsiccant starch is fed back with newly adding wet feed mix, it is unfavorable solving sticking wall problem, and feeding back starch in addition increases equipment attrition and waste electric power.Require wet starch to contain moisture 35% also not exclusively rationally, because the starch moisture about 40% that scraper centrifugal machine dries is advisable.Increase equipment and power again for getting rid of the pipeline obstacle, its advantage can not be given full play to.

The purpose of this utility model is: design and a kind ofly utilize whole waste gas residual heats and reclaim starch in the waste gas, reduce the starch loss of dispersing, solve the two-stage airflow dryer of sticking wall obstruction.

Technical process of the present utility model with constitutional features is: adopt hot blast to distribute the two-stage airflow dryer that setting device, malleation air-flow combine with negative-pressure air-flow, the negative pressure drying section is discharged finished product, positive pressuring drying section combustion gas.This stoving process flow process is a core with blower fan (5), and the air intake negative-pressure pipeline is prolonged as second stage negative pressure drying section (6), and air draft malleation pipeline is prolonged as first step positive pressuring drying section (2).Negative-pressure pipeline is the hot blast negative suction dryer section (6) of well heater (4) heating, be used to dry work in-process and reach finished product, isolate finished product starch outside wind stopping device (8) discharge machine by finished product cyclone (7), the starch dust that waste gas is carried secretly with it all sucks blower fan (5), together send into positive pressuring drying section (2) by the wet starch of feeder (1) feeding simultaneously, carry out the drying first time, isolate work in-process starch through work in-process pipeline negative suction dryer section (6) by work in-process cyclone (3), carry out the drying second time, waste gas is sent into wet dust catcher (9) outside discharge system after the processing of recovery starch.Being provided with hot blast and distributing setting device in technical process, in order to adjust calorie distribution ratio between positive pressuring drying section (2) and the negative pressure drying section (6), mainly is the drying capacity that improves the positive pressuring drying section.It promptly is to have the auxilliary heating duct (12) of variable valve well heater (4) and the direct UNICOM of blower fan (5) blast inlet that hot blast distributes setting device, form and negative pressure drying section (6) parallel pipeline, the part hot blast is directly sucked blower fan (5) advance positive pressuring drying section (2), improve the temperature that reclaims waste gas, increase drying capacity, introduce how much controlling of hot blast rate with variable valve (15).Hot blast distributes the function of setting device that 2 points are arranged: first, be directly to introduce the drying capacity that hot blast improves one-level positive pressuring drying section, only can dry the degree that does not produce sticking wall to wet starch and be advisable, and the temperature of combustion gas is lower, only about 43 degree.Spent air temperture can make full use of the heat energy of air than low 12 degree of 55 common degree like this, and corresponding drying thermal efficiency brings up to 84% by 74%.The second, hot blast distributes setting device to regulate hot blast and distributes, and the degree of drying of control oven dry finished product is to reach the requirement of W-Gum (13%) and yam starch different humidity such as (20%).This dryer is discharged finished product starch with negative pressure drying section (6), the loss of almost not dispersing, and the temperature of waste discharge gas very low humidity is big again, and starch-containing dust is few, reclaims through wet dust catcher again and discharges after starch is handled, and the starch loss reduces to extremely low.

Advantage of the present utility model: have malleation and negative-pressure air-flow bonded two-stage airflow dryer that hot blast distributes setting device, the thermo-efficiency of drying machine is up to 84%, heat energy consumption is low, 1 kilogram of water consumption 1.45 kg of vapor of evaporation when oven dry starch is worked continuously, dry 1 kilogram of starch, calculate by common moisture, consume 0.665 kg of vapor.Evaporate 1 kilogram of water consumption quantity of steam and compare saving steam 20%～30% with external common level, oven dry starch consumption quantity of steam can be saved more than 20%.Overcharge back 0.2% during oven dry starch.Compare with domestic level, dry 1 ton of starch and can save coal-fired about 100 jin.

Fig. 1 is technical process of the present utility model and equipment synoptic diagram.

Fig. 2 is the structure and the installation plan of discharging work in-process starch pipe internal control drilling part.

10 is basins among Fig. 1, and 11 is water pump.

Narrate embodiment of the present utility model below in conjunction with Fig. 1 and Fig. 2: wet starch feeder (1), one-level malleation airflow drying tube (2), its front end the give a dinner for a visitor from afar air outlet and the wet starch feeder (1) of machine (5), back termination work in-process cyclone (3), work in-process cyclone (3) upper end waste discharge tracheae connects wet dust catcher (9), lower end discharging work in-process starch pipe connects the hot blast main (13) that hot blast distributes setting device, the termination hot blast distributes the variable valve (16) of setting device to connect well heater (4) before the hot blast main, back termination secondary negative-pressure air-flow drying tube (6), be connected into product cyclone (7) again, the wind stopping device (8) of discharging finished product starch is installed in finished product cyclone (7) lower end, upper end discharging waste gas pipe connects the auxilliary heating duct (12) that hot blast distributes setting device, auxilliary heating duct front end is installed hot blast and is distributed the variable valve (15) of setting device to connect well heater (4), is connected to the blast inlet of blower fan (5) after rear end and finished product cyclone waste discharge tracheae can connect.Installation can be passed through work in-process starch in work in-process cyclone (3) the lower end discharging semifinished tube, limits again from the control punch spare (14) of malleation section to the mobile too much cryogenic gas of negative pressure section.

Hot blast distributes setting device to be installed in parallel hot blast main (13) and auxilliary heat pipe (12) by well heater (4) to add that variable valve forms.Hot blast main (13) is to be communicated with well heater (4) to be communicated with work in-process cyclone (3) with negative pressure drying pipe (6) and through work in-process starch pipe.Auxilliary heating duct (12) is to be communicated with well heater (4) to be communicated with finished product cyclone (7) with the waste discharge tracheae of blower fan (5) blast inlet and process finished product cyclone (7).Variable valve is to regulate in control hot blast main (13) and the auxilliary heat pipe (12) to flow through the hot air flow ratio, its function can be by two variable valve: hot blast main (13) variable valve (16) and auxilliary heating duct (12) variable valve (15) are finished, also can finish, perhaps install one with auxilliary heating duct (12) hot air inlet place and distribute the variable valve of hot air flow to finish at hot blast main (13) by some variable valve wherein.

Wet starch feeder (1) is installed in the front end of first step positive pressuring drying pipe (2) after blower fan (5) exhaust outlet, also can be installed in before blower fan (5) blast inlet as required and the waste discharge tracheae of finished product cyclone (7) and auxilliary hot blast (12) join on the connecting pipeline between the mouth.

Claims

1, just a kind of, negative-pressure air-flow bonded two-stage airflow dryer, it is characterized in that adopting hot blast to distribute setting device, malleation and negative-pressure air-flow bonded two-stage airflow dryer are arranged, its composition: wet starch feeder (1), one-level malleation airflow drying tube (2), its front end give a dinner for a visitor from afar machine (5) air outlet and wet starch feeder (1), back termination work in-process cyclone (3), work in-process cyclone (3) upper end waste discharge tracheae connects wet dust catcher (9), lower end discharging work in-process starch pipe connects the hot blast main (3) that hot blast distributes setting device, hot blast main (13) front end is installed hot blast and is distributed variable valve (16) to connect well heater (4), back termination secondary negative-pressure air-flow drying tube (6), be connected into product cyclone (7) again, the wind stopping device of discharging finished product starch is installed in finished product cyclone (7) lower end, waste discharge tracheae in upper end connects the auxilliary heating duct (12) that hot blast distributes setting device, auxilliary heating duct (12) front end is installed hot blast and is distributed variable valve (15) to connect well heater (4), the give a dinner for a visitor from afar blast inlet of machine (5) of rear end.

2, by the described dryer of claim 1, it is characterized in that: hot blast distributes the composition of setting device, well heater (4) is installed in parallel hot blast main (13) and auxilliary heating duct (12), after joining, the discharging work in-process starch pipe of hot blast main (13) and work in-process cyclone (3) connects negative pressure drying pipe (6), after joining, the waste discharge tracheae of auxilliary heating duct (12) and finished product cyclone (7) is connected to blower fan (5) blast inlet, enter one-level malleation airflow drying tube (2) again, hot blast main (13) front end is installed hot blast and is distributed variable valve (16), auxilliary heating duct (12) front end is installed hot blast and is distributed variable valve (15).

3, by claim 1 and 2 described dryers, it is characterized in that: hot blast main (13) is installed respectively with auxilliary heating duct (12) front end and is regulated the hot blast distribution variable valve (15) and (16) that changes the pipeline sectional area.

4, by claim 1 and 2 described dryers, it is characterized in that: the variable valve that changes the pipeline sectional area is installed at the front end hot air inlet place of arbitrary pipe in hot blast main (13) and the auxilliary heating duct (12).

5, by claim 1 and 2 described dryers, it is characterized in that: with auxilliary heating duct (12) hot air inlet place the variable valve that a total adjusting hot air flow distributes is installed at hot blast main (13).

6, connect the hot blast main (13) that hot blast distributes setting device by the described work in-process cyclone of claim 1 (3) lower end discharging work in-process starch pipe, it is characterized in that: installation can pass through work in-process starch in work in-process cyclone (3) the lower end discharging work in-process starch pipe, limits again from the control punch spare (14) of positive pressuring drying section to the mobile too much low temperature and high relative humidity gas of negative pressure drying section.

7,, it is characterized in that by the described one-level malleation of claim 1 airflow drying tube (2) preceding termination wet starch feeder (1): wet starch feeder (1) be installed in blower fan (5) exhaust duct by blower fan one end.

8, by the described one-level malleation of claim 1 airflow drying tube (2) preceding termination wet starch feeder (1), it is characterized in that: wet starch feeder (1) is installed in blower fan (5) blast inlet one end.