CN109173559A - A kind of condensation cycle gain of heat batch circulating grain products drying energy saving device - Google Patents
A kind of condensation cycle gain of heat batch circulating grain products drying energy saving device Download PDFInfo
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- CN109173559A CN109173559A CN201811221703.1A CN201811221703A CN109173559A CN 109173559 A CN109173559 A CN 109173559A CN 201811221703 A CN201811221703 A CN 201811221703A CN 109173559 A CN109173559 A CN 109173559A
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- 238000001035 drying Methods 0.000 title claims abstract description 125
- 238000009833 condensation Methods 0.000 title claims abstract description 100
- 230000005494 condensation Effects 0.000 title claims abstract description 100
- 235000011868 grain product Nutrition 0.000 title claims abstract description 25
- 235000013339 cereals Nutrition 0.000 claims abstract description 97
- 238000007599 discharging Methods 0.000 claims abstract description 34
- 239000007921 spray Substances 0.000 claims abstract description 17
- 239000003570 air Substances 0.000 claims description 56
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 49
- 238000000034 method Methods 0.000 claims description 36
- 239000012080 ambient air Substances 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 29
- 125000004122 cyclic group Chemical group 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 5
- 238000012937 correction Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005496 tempering Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 44
- 238000004140 cleaning Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 238000011897 real-time detection Methods 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000010981 drying operation Methods 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 125000002837 carbocyclic group Chemical group 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000007602 hot air drying Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 208000011580 syndromic disease Diseases 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/22—Controlling the drying process in dependence on liquid content of solid materials or objects
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/06—Grains, e.g. cereals, wheat, rice, corn
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a kind of condensation cycle gain of heat batch circulating grain products drying energy saving devices, comprising: drying machine is disposed with delay section, dryer section, grain discharging section, grain discharging opening from top to bottom；And there are two pipelines for the dryer section two sides connection；Elevator is arranged on the outside of the drying machine, and in vertical distribution, and cereal can be promoted to top from bottom end by the elevator, and cereal is made to enter the drying machine；Conveyer connects the elevator bottom end and the drying machine grain discharging opening；Air-heater, outlet end are connected to a side ducts of the dryer section；Heater, outlet are connected to the arrival end of the air-heater；Condenser, entrance are connected to another side ducts of the dryer section, the entrance of heater described in outlet；Spray pump is arranged in the condenser.The present invention can provide clean, stable dried medium to drying machine；And the circulation of tail gas after drying can be recycled and utilized, it is energy saving, reduce cost.
Description
Technical field
The present invention relates to grain dry fields more particularly to a kind of condensation cycle gain of heat batch circulating grain products drying energy saving to fill
It sets.
Background technique
With the development of the social economy, the energy and environment are focuses concerned by people, every profession and trade all advocates energy-saving and emission-reduction, low
Carbocyclic ring is protected, and grain heat-drying belongs to the operation of high energy consumption high pollution, existing with greater need for the equipment using reducing energy consumption and reducing pollution
Heating power foodstuff drying device mostly use hot-blast stove as heat source, coal-fired hot-blast stove is gradually fired since smoke pollution is seriously in
The trend that oil, combustion gas and biomass thermal wind furnace replace, and electric energy is ideal clean energy resource, disadvantage is that drying cost is higher.
In addition, dryer exhaust temperature is generally at 30~60 DEG C, relative humidity is about 50%~80%, belongs to cryogenic waste heat resource, though
So taste is not high, but flow is big, continuous-stable, but batch circular grain drying machine dryer section waste heat from tail gas currently on the market returns
Receipts utilize few, let alone condense the gain of heat, that is, deep exploitation tail gas latent heat, this partial heat energy just wastes.
In addition, dryer automated control technology is also rapidly developing, accurate and intelligence drying machine control system is to dry
The strong guarantee of grain quality afterwards, therefore how to realize that accurate and stable control is the target that foodstuff drying device industry is pursued.
Wherein the control of heat resource equipment is also to influence the important link of dryer system control, wherein using traditional fire coal, fuel oil, combustion
The Combustion System of gas and hot air furnace has randomness big, and combustion process is complicated, has the characteristics that biggish hysteresis quality, realizes hot-blast stove
Be precisely controlled it is relatively difficult.
The heat pump dryer to grow up in recent years, although meeting energy conservation and environmental protection and the high requirement of automatic control level,
But there are following some limitations: it is required that environment temperature between 5~40 DEG C, is not suitable for cold district, and volume is big, investment
Greatly, drying efficiency is low.
Summary of the invention
The present invention is to solve current technology shortcoming, and it is dry to provide a kind of condensation cycle gain of heat batch circulating grain products
Energy saver is connected to by the outlet of drying machine with condenser inlet, and make the outlet of condenser be separately connected heater with into
Wind blower, realizes the gain of heat, and drying machine provides clean, stable dried medium；
The present invention also provides a kind of control methods of condensation cycle gain of heat batch circulating grain products drying energy saving device, will dry
Section tail gas by condenser condense the gain of heat and with after cool ambient air in heat exchanger tube and the heat transfer of mixture gas of condensing gas again benefit
With having saved the energy, reduced drying cost.
It is another object of the present invention to control the ratio of the condensing gas of cool ambient air and condenser out, heat exchanger is prevented
While interior icing, condensation efficiency and the thermal efficiency are improved.
A kind of technical solution provided by the invention are as follows: condensation cycle gain of heat batch circulating grain products drying energy saving device, comprising:
Drying machine is disposed with delay section, dryer section, grain discharging section, grain discharging opening from top to bottom；And the dryer section
There are two pipelines for two sides connection；
Elevator is arranged on the outside of the drying machine, and in vertical distribution, and the elevator can be by cereal the bottom of from
End is promoted to top, and cereal is made to enter the drying machine；
Conveyer connects the elevator bottom end and the drying machine grain discharging opening；
Air-heater, outlet end are connected to a side ducts of the dryer section；
Heater, outlet are connected to the arrival end of the air-heater；
Condenser, entrance are connected to another side ducts of the drying machine, the entrance of heater described in outlet；
Spray pump is arranged in the condenser.
Preferably, further includes:
Air inlet is arranged in described condenser one end；
Air intake blower fan is arranged in the air inlet；
Condensation fan, the outlet of entrance and the condenser, outlet are connected to the air inlet.
Preferably, further includes:
Humidity discharging air-introduced machine is connect with the condenser, and is provided with humidity discharging mouth on the humidity discharging air-introduced machine；
Water tank is connect by water pump with the spray pump；
It is provided with overflow port on the condenser, for cooling water to be discharged；
And the connection of the overflow port and the water tank.
A kind of control method of condensation cycle gain of heat batch circulating grain products drying energy saving device, comprising:
Grain to be dried is packed into drying machine to predetermined material position；
Thermal medium successively passes through heater, air-heater, drying machine, constitutes thermal medium stream；
The cryogenic media being discharged from the drying machine must dry cryogenic media after condensing water removal from condenser, described dry
Dry cryogenic media is divided into first and dries cryogenic media and the second dry cryogenic media, and described first dries described in cryogenic media entrance
Heater, the described second dry cryogenic media and cool ambient air are mixed into condensation by mixing medium；
Cryogenic media in the condensation by mixing medium and the condenser carries out heat exchange condensation；
The water content of grain to be dried is detected using the grain cyclic drying control method based on temperature zone, until it is reached
To when requiring, stop drying, grain is discharged.
Preferably,
Described second dry cryogenic media is extracted via condensation fan to the heat exchanger tube of the condenser, and the external world is cold
Air is entered in the heat exchanger tube of the condenser by the air intake blower fan of the condenser, mixed with the described second dry cryogenic media
It is combined into condensation by mixing medium；
The stream of the described second dry cryogenic media flow and the cool ambient air is adjusted by regulating and controlling the condensation fan
Magnitude relation makes the condensation by mixing medium temperature be equal to the dew point of the dry cryogenic media；
The flow of the cool ambient air and the second dry cryogenic media flow meets:
Wherein, Q1For the cool ambient air flow, Q2For the described second dry cryogenic media flow, d3For dry low temperature
The moisture content of medium, dmFor the moisture content of the condensation by mixing medium.
Preferably,
The moisture content d of the condensation by mixing mediummDetermination method:
The cool ambient air state point A, cryogenic media state point C and condensation by mixing are determined on air psychrometric chart
The state point D of medium, line segment point AD and thermoisopleth t=tdIntersect at point M (dm,Im), point M (dm,Im) it is condensation by mixing medium
State point；
Wherein, tdFor the dew point, ImThe thermal content of condensation by mixing medium.
Preferably,
Adjusted by regulating and controlling the revolving speed of the condensation fan and air intake blower fan the described second dry cryogenic media flow with
The discharge relation of the cool ambient air, the air intake blower fan revolving speed n1With the revolving speed n of the condensation fan2Meet:
Also, Q1And Q2Meet:
Q1+Q2≤Q
Wherein, Q is the flow of the cryogenic media.
Preferably,
The cryogenic media of the drying machine discharge obtains condensed water after condensation water removal at condenser, and the condensed water enters
Water tank, spray pump extract heat exchange pipe external surface described in the condensation water spray.
Preferably,
The grain cyclic drying control method based on temperature zone specifically includes:
Step 1: determining theory accumulated temperature value CT0；
Step 2: calculating real-time temperature zone CT1
Wherein, TeFor equilibrium temperature,For mean temperature,Meet:
Wherein, TiFor the temperature of i-th of temperature sensor measurement, k is temperature sensor number,
Step 3: calculating amendment temperature zone CT2
CT2=K0×CT1
Wherein, K0For accumulated temperature correction factor, value 0.96；
Step 4: working as | CT0-CT2| > ε, grain to be dried continue drying, until occurring | CT0-CT2When |≤ε, stop dry
It is dry, grain is discharged.
Preferably,
The theory accumulated temperature value CT0Value using accumulated temperature model determine, the specific method is as follows:
It is more corresponding than choosing according to relative humidity, drying machine tempering in drying machine in grain drying theory accumulated temperature quality figure
Accumulated temperature line reference line and quality reference line, make horizontal line along the initial point of moisture of cereal, the horizontal line and drying quality index
Quality reference line there is intersection point, accumulated temperature value corresponding to the accumulated temperature line by the intersection point is theoretical accumulated temperature value CT0。
It is of the present invention the utility model has the advantages that 1) devise multi-stage condensing gain of heat heat exchanger, which increase condensation water spray is clear
The circulatory system is washed, dust and soil on condenser heat-exchange pipes can be cleaned in time, do not influence heat exchange efficiency as far as possible, can be used
Electric energy clean energy resource, dried medium needed for being supplied to clean, accurate, the stable technique of drying machine；2) condensation gain of heat tail is utilized
Recycling and reusing after gas recovery process dehumidifies dryer section tail gas condensing, dried medium form air-source closed circulation, significantly
The energy has been saved, drying cost is reduced, has improved economic benefit；3) conventional recycle stoving process high humidity tail gas is changed not return
The situation of receipts realizes 40% or more energy conservation, particularly suitable for cold and half cold district application；4) by adjusting condensation fan
With the frequency (or revolving speed) of air intake blower fan, matching for condensing gas stream (second dry cryogenic media) and cool ambient air air quantity is realized
Than guaranteeing that proper amount of water can be condensed out by the dry gas stream of condenser while preventing from freezing in heat exchanger tube, by condensing gas
Epidemic disaster drops to most preferably, so that reaching makes the thermal efficiency of entire drying system and the optimal purpose of dehydration efficiency；5) using equivalent
The control system real-time detection grain moisture content of accumulated temperature realizes the automatic control of grain cyclic drying process；6) cold can be utilized
The cold medium in area carries out condensation operation, avoids using heat pump installations expensive, complicated for operation, reduces equipment price
1/2 or more.
Detailed description of the invention
Fig. 1 is the structure chart of condensation cycle gain of heat batch circulating grain products drying energy saving device of the invention.
Fig. 2 is the top view of condensation cycle gain of heat batch circulating grain products drying energy saving device of the invention.
Fig. 3 is the process flow chart of condensation cycle gain of heat batch circulating grain products drying energy saving device of the invention.
Fig. 4 is the grain cyclic drying control method flow chart of the invention based on temperature zone.
Fig. 5 is air psychrometric chart of the invention.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text
Word can be implemented accordingly.
Condensation cycle gain of heat batch circulating grain products drying equipment of the invention mainly includes loading, starts circulation, is automatic cold
Solidifying temperature adjustment, monitoring moisture, the part composition such as stop operation and arrange grain.As shown in Figs. 1-2, drying machine 110, from top to bottom successively
It has been provided with delay section, dryer section, grain discharging section, grain discharging opening, has been provided with and communicated with two pipelines 111 in dryer section two sides.Delay section
For the crop storage in drying process so that cereal internal moisture is to external diffusion, dryer section is dry for heat grain, row
Grain section is arranged in dryer section bottom, and the cereal after drying can be discharged to drying machine 110 from grain discharging opening by the top of grain discharging opening
Outside.In 110 outside of drying machine vertical arrangement is presented, and the height of elevator 120 is greater than drying machine 110 in the setting of elevator 120
Height, be provided in the bottom of elevator 120 and mention grain mouth, elevator 120 will be from cereal hoisting that grain mouth enters be mentioned to promotion
The top of machine 120 makes cereal enter drying machine 110.Conveyer 180 connects 120 bottom end of elevator and mentions grain mouth and 110 row of drying machine
Grain mouth can be mutually connected by rotation direction with grain mouth is mentioned, and entered the cereal being discharged from grain discharging opening and mentioned grain mouth.Conveyer
180 use screw conveyor.
130 outlet end of air-heater is connected to a side ducts 111 of dryer section, provides the hot wind of required temperature for dryer section.
Heater 140, outlet are connected to the arrival end of air-heater 130；Dried medium that is uniform, stablizing and accurately control is provided.
150 entrance of condenser is connected to another side ducts of the raising section, the entrance of heater described in outlet, condenser 150
Heat exchanger tube be S type condenser, be dryer section tail gas (cryogenic media) and heat exchanger tube in cool ambient air and a part of tail
The heat-exchanger rig of gas after gas condensing gas (the second dry cryogenic media) mixing, by the sensible heat and part recovery of latent heat benefit in tail gas
It dehumidifies with and by tail gas.Spray pump 151 is arranged in condenser 150, and spray pump 151 is connected to by water pump 152, by water pump 152
Interior water is changed by each heat exchange pipe external surface of water injection to S type condenser 150 with removing to stay in after dryer section tail gas condensing
The dust and soil of heat pipe outer surface, and it is provided with sludge box 190 below the heat exchanger tube of condenser 150, for collecting dry gas
The impurity such as the dust, the soil that are discharged in stream, and periodically to clear up.Condenser working needs cleaning and descaling afterwards for a period of time, clearly
Wash water is discharged by cleaning water outs 153.
One end of condenser is provided with air inlet 155, air inlet 155 is connected to heat exchanger tube in the condenser 150, into
Two ends are punished out in air port 155, and an end is provided with air intake blower fan, for extracting cool ambient air, another end connection condensation
The outlet of blower 170 mixes the air-flow come at two, into heat exchange intraductal heat exchange, prevents heat exchanger tube from freezing.Condensation fan
170 entrance is connected with the outlet of condenser 150.Condensation fan 170 and air intake blower fan are frequency conversion fan, by condensing gas and outside
Boundary's cold air air distribution in proportion, adjusts at condenser air inlet 155 wind-warm syndrome at 0 DEG C or more, drying machine tail gas dew-point temperature hereinafter,
Humidity discharging air-introduced machine 160 is connect with condenser 150, and humidity discharging mouth 161 is provided on humidity discharging air-introduced machine 160.150 shell side of condenser
Humidity starts 160 humidity discharging of humidity discharging air-introduced machine when reaching 85%, and the tail gas for being discharged into atmosphere at this time has already passed through condensation heat release and dedusting
Processing.Overflow port 154 is provided on condenser 150, for clean cooling water to be discharged；And overflow port 154 and the water tank
Connection, recycle cooling water.Grain discharging section is provided with draining crop mechanism, and the draining crop mechanism includes impeller, and the impeller
Rotation drives the cereal being located above impeller to move to below impeller and then be discharged from the grain discharging opening.110 top of drying machine is slow
Soviet Union's section is provided with level sensor.
As Fig. 4 loading process is as follows: starting elevator 120 gives the grain from top of drying machine 110, and level sensor expires grain report
After police, stop loading operation；Start cyclic process: by starting air-heater 130, elevator 120, screw conveyor 180, drying
Machine draining crop mechanism and heater 140 start grain circulation, and making grain to be dried, gradually drying, starting become in cyclic process
The condensation fan 170 of frequency opens dried medium circulation (thermal medium stream and cryogenic media stream), makes air in air-heater 130, drying
Machine 110, condenser 150 form closed circulation between heater 140, and dryer section tail gas (cryogenic media) passes through condenser 150
Recycling after heat release dehumidifies is condensed, feeding spraying pump 151, starting spray clean cycle are opened；Self-refrigeration temperature adjustment: pass through
Frequency conversion reflux condensation mode blower 170 and air intake blower fan, control tail gas condensing gas (the second dry cryogenic media) and cool ambient air
Proportion is so that the temperature of condenser tube side controls the dew-point temperature (or within dew-point temperature) in tail gas condensing gas, it is ensured that cold
Dryer section tail gas in condenser should be condensed and cannot be frozen；Monitor moisture: the control of the grain cyclic drying based on temperature zone
Method processed, the moisture of real-time monitoring grain reach Target moisture and are just automatically stopped operation；It stops operation: closing heater 140,
Drying machine draining crop mechanism, screw conveyor 180, elevator 120 and air-heater 130 close frequency conversion condensation to stop grain circulation
Blower 170 and air intake blower fan switch off the pump 152 to stop thermal medium circulation to stop clean cycle；It arranges grain: opening elevator
120 with the interface of storage facilities, close the interface of elevator 120 and drying machine 110, starting drying machine draining crop mechanism, conveyer
180 and elevator 120 will dry to the grain of safe moisture and be discharged into preset device.Condensation cycle gain of heat batch circulating grain products are dry
Equipment includes: heater 140, for providing stable, reliable, controllable thermal energy, and then heat drying medium, is connect in air-heater
Air after being heated by heater 140 is blasted the dryer section of circulating drying machine 110 by 130 one end, air-heater 130 again, into
Row hot-air drying process, elevator 120 are used for grain hoisting to the top of drying machine 110, realization from top the operation of grain,
The operation of grain cyclic drying and row's grain operation, screw conveyor 180 connect drying machine 110 and elevator 120, for realizing grain
Cyclic drying operation and row's grain operation are eaten, the damp and hot tail gas of dryer section discharge enters multi-stage condensing device 150, in multi-stage condensing device
In 150, damp and hot tail gas condensing heat release and and from air inlet 155 enter 150 heat exchanger tube of multi-stage condensing device in cool ambient air with
The mixed gas of condensing gas exchanges heat, i.e., the vapor in damp and hot tail gas becomes liquid by gaseous state and releases the latent heat of vaporization, significantly
The available heat of damp and hot tail gas is increased, while the moisture content of tail gas reduces, 150 shell side humidity of multi-stage condensing device reaches
Start 160 humidity discharging of humidity discharging air-introduced machine when 85%, the drying tail gas for being discharged into atmosphere at this time has already passed through at condensation heat release and dedusting
Reason, is the cleaner gas of low temperature, and in 150 course of work of multi-stage condensing device, spray pump 151 will constantly be extracted out by water pump 152
Water injection to multi-stage condensing device 150 each heat exchange pipe external surface, to stay in outside heat exchanger tube after removing dryer section tail gas condensing
The dust and soil on surface, multi-stage condensing device 150 need cleaning and descaling after a period of work, and ejected wash water passes through cleaning water outs
153 discharges.The liquid water that vapor condenses in multi-stage condensing device 150 is discharged into cleaning sink from cooling water overflow mouth 154, further
It is used as ejected wash water.
Condensation cycle gain of heat batch circulating grain products drying energy saving control method and equipment of the present invention, have started condensation
The gain of heat recycles tail gas and dried medium is made to form the new method of closed circulation, rationally controls to enter by air flow rate proportioning and change
The air themperature of heat pipe solves the problems, such as that condensation water freezing, spray cleaning heat exchanger tube solve grey in the grain that tail gas is brought into
Dirt is attached on heat exchanger tube the problem of reducing heat exchange efficiency, and the moisture of discharge also goes through cleaning, reaches cleaning, free of contamination mesh
's.Complete equipment and the main advantage of technique be exactly it is energy saving, pollution-free, thermal medium control precision is high, equipment investment is few.
As the invention also includes whole system is equipped with a set of control cabinet, and connection controls each portion of entire drying system
The collaborative work of part device, the hot wind for accurate, uniform dryer required temperature that heater 140 provides, temperature data can be real-time
Control system accurately is fed back to, air-heater 130, elevator 120, drying machine 110, conveyer 180, water pump 152 all pass through control
System control processed simultaneously opens work simultaneously, controls condenser by frequency conversion reflux condensation mode blower 170 and air intake blower fan and the external world is cold
The mixed proportion of air is so that the control of condenser tube side inlet temperature is at 0 DEG C or more, and tail gas dew-point temperature is hereinafter, to guarantee to change
Condensed water on heat pipe does not freeze, and condenser 150 installs humidity sensor, and the gas humidity of real-time detection condenser shell side does not surpass
Cross 85%, more than when just start 160 humidity discharging of humidity discharging air-introduced machine.
A kind of control method of condensation cycle gain of heat batch circulating grain products drying energy saving device provided by the invention, comprising:
Grain to be dried is packed into drying machine to predetermined material position；Thermal medium successively passes through heater, air-heater, drying machine, constitutes heat and is situated between
Mass flow；The cryogenic media being discharged from the drying machine must dry cryogenic media, the drying after condensing water removal from condenser
Cryogenic media is divided into the first drying cryogenic media and the second dry cryogenic media, and the described first dry cryogenic media enters described add
Hot device, the described second dry cryogenic media and cool ambient air are mixed into condensation by mixing medium；The condensation by mixing medium and institute
The cryogenic media stated in condenser carries out heat exchange condensation；Using based on temperature zone grain cyclic drying control method detection to
Grain is discharged until stopping drying when it reaches requirement in the water content of drying grain.
Described second dry cryogenic media is extracted via condensation fan to the heat exchanger tube of the condenser, and the external world is cold
Air is entered in the heat exchanger tube of the condenser by the air intake blower fan of the condenser, mixed with the described second dry cryogenic media
It is combined into condensation by mixing medium；
The described second dry cryogenic media flow and the cool ambient air are adjusted by regulating and controlling the condensation fan frequency
Discharge relation, make the condensation by mixing medium temperature be equal to the dry cryogenic media dew point；
The flow of the cool ambient air and the second dry cryogenic media meets:
Wherein, Q1For the cool ambient air flow, Q2For the described second dry cryogenic media flow, d3For dry low temperature
The moisture content of medium, dmFor the moisture content of the condensation by mixing medium.
The moisture content d of the condensation by mixing mediummDetermination method:
The inlet of condenser is provided with flowmeter, the flow Q of the medium of condenser can be entered with real-time detection, cold
The entrance and exit of condenser is respectively arranged with Hygrothermograph, for measure the temperature of cryogenic media and dry cryogenic media with it is wet
Degree, while air intake blower fan inlet is provided with the Hygrothermograph of measurement cool ambient air, it is possible thereby to determine cryogenic media, drying
The state point of cryogenic media and cool ambient air on air psychrometric chart, as shown in figure 5, A (d0,I0) it is cool ambient air state
Point, I0For the thermal content of cool ambient air；C(d2,I2) it is cryogenic media state point.φ=100% is equal relative humidity in figure
Line.The temperature that condensation by mixing medium is controlled in the present invention is the dew point of dry cryogenic media, is mixed it is possible thereby to determine in psychrometric chart
Close the state point D (d of cooling medium3,I3), I3For the thermal content of condensation by mixing medium；AD is connected, thermoisopleth t=t is found outd, line
Section AD and thermoisopleth t=tdIntersect at point M (dm,Im), point M (dm,Im) be condensation by mixing medium state point；Wherein, tdFor institute
Dew point is stated, according to the temperature and humidity of condensed dry cryogenic media, tables look-up or can be acquired by air psychrometric chart.ImFor mixing
The thermal content of cooling medium.
Adjusted by regulating and controlling the revolving speed of the condensation fan and air intake blower fan the described second dry cryogenic media flow with
The discharge relation of the cool ambient air, the air intake blower fan revolving speed n1With the revolving speed n of the condensation fan2Meet:
Also, Q1And Q2Meet:
Q1+Q2≤Q
Wherein, Q is the flow of the cryogenic media.
Since the air quantity (flow) and rotation speed of fan of blower are proportional, and in the rated speed n of known air intake blower fan1 0
And its corresponding metered flow Q1 0With the rated speed n of condensation fan2 0And its corresponding metered flow Q2 0When, it is available:
With
To reach the thermal efficiency and dehydration efficiency most preferably, it is consistent to need to control external flux in heat exchanger tube, even if Q1+Q2=
Q can then calculate the tachometer value for learning air intake blower fan and condensation fan, it is possible thereby to control flow according to above formula relationship.
Simultaneously as there is also following relationships for motor (air intake blower fan or condensation fan) revolving speed and frequency
N=60f/p
Wherein, n is motor (air intake blower fan or condensation fan) revolving speed, and f is motor (air intake blower fan or condensation fan) frequency,
P is the number of pole-pairs of motor (air intake blower fan or condensation fan) rotating excitation field.
It can also thus be controlled by the frequency of change motor (air intake blower fan or condensation fan) come controller revolving speed as a result,
The flow of motor (air intake blower fan or condensation fan) processed.
The cryogenic media of the drying machine discharge obtains condensed water after condensation water removal at condenser, and the condensed water enters
Water tank, spray pump extract heat exchange pipe external surface described in the condensation water spray.
As shown in figure 4, the grain cyclic drying control method based on temperature zone specifically includes:
Step 1: measurement effective volume V, unit arrange grain volume Q, the single cycle time t of drying machine is calculated,
Wherein V is drying machine effective volume, and Q is that grain discharging wheel unit arranges grain volume, and w is grain discharging wheel revolving speed, and t is in drying machine
The time required to grain completes a circulation.
Step 2: detecting the initial moisture m of grain to be dried1, together with Target moisture mtInput Data Process；According to raw grain
Moisture, Target moisture are tabled look-up or operation experience or determining dry required theoretical using the model of storage in a data processor
Accumulated temperature value CT0。
Step 3: determining the equilibrium temperature T for calculating equivalent dry accumulated temperature basic pointe, select to be existed using equilibrium temperature by early period
Equilibrium water conten model inference goes out in document, the equilibrium temperature T of cerealeRelationship mould between equilibrium relative humidity (ERH), equilibrium water conten
Type such as following formula, wherein grain equilibrium relative humidity selects the ambient humidity of temperature and humidity collection unit acquisition, and equilibrium water conten selects paddy
The dry Target moisture of object.
In above-mentioned formula, EMC represents equilibrium water conten, %；ERH represents humidity discharging air balance relative humidity, %；TeIt represents flat
Weigh temperature, DEG C；A, B, C respectively represent 3 parameters, for different cultivars numerical value difference such as the following table 1.
The equation parameter and degree of fitting of 1 different cultivars dried object of table
Note: R2It is the coefficient of determination；MRE% is average relative percentage error.
Step 4: real-time detection records multiple temperature sensor inspections for being mounted on and arranging in dryer section in drying operation
The cereal temperature of survey, calculate and storage drying machine in grain to be dried temperature zone value CT1
Wherein, TeFor equilibrium temperature,For mean temperature,Meet:
Wherein, TiFor the temperature of i-th of temperature sensor measurement, k is temperature sensor number,
Step 5: calculating amendment temperature zone CT2
CT2=K0×CT1
Wherein, K0For accumulated temperature correction factor, value 0.96；
Step 4: working as | CT0-CT2| > ε, grain to be dried continue drying, until occurring | CT0-CT2When |≤ε, stop dry
It is dry, grain is discharged.
Theoretical accumulated temperature value CT0Value using accumulated temperature model determine, the specific method is as follows: in grain drying theory accumulated temperature quality
In figure, according to relative humidity, drying machine tempering in drying machine than choosing corresponding accumulated temperature line reference line and quality reference line, along
The initial point of moisture of cereal makees horizontal line, and the intersection point of the quality reference line of the horizontal line and drying quality index is A, by A point
Accumulated temperature value corresponding to accumulated temperature line is theoretical accumulated temperature value CT0。
In the present invention, the test data of each sensor, Hygrothermograph, flowmeter is acquired according to certain sampling period,
And the processing and analysis of data are carried out, to regulate and control the working condition of air intake blower fan or condensation fan and remaining each device feature.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With it can be fully applied to various fields suitable for the present invention, for those skilled in the art, can be easily
Realize other modification, therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (10)
1. a kind of condensation cycle gain of heat batch circulating grain products drying energy saving device characterized by comprising
Drying machine is disposed with delay section, dryer section, grain discharging section, grain discharging opening from top to bottom；And the dryer section two sides
There are two pipelines for connection；
Elevator is arranged on the outside of the drying machine, and in vertical distribution, and the elevator can mention cereal from bottom end
Top is risen to, cereal is made to enter the drying machine；
Conveyer connects the elevator bottom end and the drying machine grain discharging opening；
Air-heater, outlet end are connected to a side ducts of the dryer section；
Heater, outlet are connected to the arrival end of the air-heater；
Condenser, entrance are connected to another side ducts of the dryer section, the entrance of heater described in outlet；
Spray pump is arranged in the condenser.
2. condensation cycle gain of heat batch circulating grain products drying energy saving device according to claim 1, which is characterized in that also wrap
It includes:
Air inlet is arranged in described condenser one end；
Air intake blower fan is arranged in the air inlet；
Condensation fan, the outlet of entrance and the condenser, outlet are connected to the air inlet.
3. condensation cycle gain of heat batch circulating grain products drying energy saving device according to claim 2, which is characterized in that also wrap
It includes:
Humidity discharging air-introduced machine is connect with the condenser, and is provided with humidity discharging mouth on the humidity discharging air-introduced machine；
Water tank is connect by water pump with the spray pump；
It is provided with overflow port on the condenser, for cooling water to be discharged；
And the connection of the overflow port and the water tank.
4. a kind of control method of condensation cycle gain of heat batch circulating grain products drying energy saving device characterized by comprising
Grain to be dried is packed into drying machine to predetermined material position；
Thermal medium successively passes through heater, air-heater, drying machine, constitutes thermal medium stream；
The cryogenic media being discharged from the drying machine must dry cryogenic media after condensing water removal from condenser, and the drying is low
Warm medium is divided into the first dry cryogenic media and the second dry cryogenic media, and the described first dry cryogenic media enters the heating
Device, the described second dry cryogenic media and cool ambient air are mixed into condensation by mixing medium；
Cryogenic media in the condensation by mixing medium and the condenser carries out heat exchange condensation；
The water content of grain to be dried is detected using the grain cyclic drying control method based on temperature zone, until it reaches and wants
When asking, stop drying, grain is discharged.
5. the control method of condensation cycle gain of heat batch circulating grain products drying energy saving device according to claim 4,
Described second dry cryogenic media is extracted via condensation fan to the heat exchanger tube of the condenser, the cool ambient air
It is drawn by air intake blower fan in the heat exchanger tube of the condenser, is mixed into condensation by mixing with the described second dry cryogenic media
Medium；
The flow that the described second dry cryogenic media flow and the cool ambient air are adjusted by regulating and controlling the condensation fan closes
System makes the condensation by mixing medium temperature be equal to the dew point of the dry cryogenic media；
The flow of the cool ambient air and the second dry cryogenic media flow meets:
Wherein, Q1For the cool ambient air flow, Q2For the described second dry cryogenic media flow, d3For dry cryogenic media
Moisture content, dmFor the moisture content of the condensation by mixing medium.
6. the control method of condensation cycle gain of heat batch circulating grain products drying energy saving device according to claim 5, special
Sign is, the moisture content d of the condensation by mixing mediummDetermination method:
The cool ambient air state point A, cryogenic media state point C and condensation by mixing medium are determined on air psychrometric chart
State point D, line segment point AD and thermoisopleth t=tdIntersect at point M (dm,Im), point M (dm,Im) be condensation by mixing medium state
Point；
Wherein, tdFor the dew point, ImThe thermal content of condensation by mixing medium.
7. the control method of condensation cycle gain of heat batch circulating grain products drying energy saving device according to claim 6, special
Sign is,
Adjusted by regulating and controlling the revolving speed of the condensation fan and air intake blower fan the described second dry cryogenic media flow with it is described
The discharge relation of cool ambient air, the air intake blower fan revolving speed n1With the revolving speed n of the condensation fan2Meet:
Also, Q1And Q2Meet:
Q1+Q2≤Q
Wherein, Q is the flow of the cryogenic media.
8. the control method of condensation cycle gain of heat batch circulating grain products drying energy saving device according to claim 7, special
Sign is,
The cryogenic media of the drying machine discharge obtains condensed water after condensation water removal at condenser, and the condensed water enters water
Case, spray pump extract heat exchange pipe external surface described in the condensation water spray.
9. the control method of condensation cycle gain of heat batch circulating grain products drying energy saving device according to claim 8, special
Sign is that the grain cyclic drying control method based on temperature zone specifically includes:
Step 1: determining theory accumulated temperature value CT0；
Step 2: calculating real-time temperature zone CT1
Wherein, TeFor equilibrium temperature,For mean temperature,Meet:
Wherein, TiFor the temperature of i-th of temperature sensor measurement, k is temperature sensor number,
Step 3: calculating amendment temperature zone CT2
CT2=K0×CT1
Wherein, K0For accumulated temperature correction factor, value 0.96；
Step 4: working as | CT0-CT2| > ε, grain to be dried continue drying, until occurring | CT0-CT2When |≤ε, stop drying, row
Grain out.
10. the control method of condensation cycle gain of heat batch circulating grain products drying energy saving device according to claim 9, special
Sign is,
The theory accumulated temperature value CT0Value using accumulated temperature model determine, the specific method is as follows:
In grain drying theory accumulated temperature quality figure, according to relative humidity, drying machine tempering in drying machine than choosing corresponding product
Warm line reference line and quality reference line make horizontal line along the initial point of moisture of cereal, the product of the horizontal line and drying quality index
Matter reference line has intersection point, and accumulated temperature value corresponding to the accumulated temperature line by the intersection point is theoretical accumulated temperature value CT0。
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