CN106512453B - A kind of nitrogen sealing and circulating corn pulp spray drying energy conservation and product method for upgrading - Google Patents
A kind of nitrogen sealing and circulating corn pulp spray drying energy conservation and product method for upgrading Download PDFInfo
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- CN106512453B CN106512453B CN201610909714.3A CN201610909714A CN106512453B CN 106512453 B CN106512453 B CN 106512453B CN 201610909714 A CN201610909714 A CN 201610909714A CN 106512453 B CN106512453 B CN 106512453B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/16—Evaporating by spraying
- B01D1/18—Evaporating by spraying to obtain dry solids
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
Abstract
The present invention relates to a kind of nitrogen sealing and circulating corn pulp spray drying energy conservations and product method for upgrading to obtain heat carrier and Dried Corn Steep Liquor Powder containing fine powder method includes the following steps: (1) corn syrup is contacted with heat carrier；Dried Corn Steep Liquor Powder is transported in warehouse；(2) fine powder and hot carrier gas are obtained after the hot carrier gas separation containing fine powder；Fine powder is transported in warehouse；(3) most of carrier gas enters circulating line；Remaining part enters in scrubbing tower, obtains the carrier gas of condensate liquid, temperature lower than 42 DEG C and sewage；(4) condensed heat transfer fluid obtains liquid；(5) temperature enters circulating line lower than a part in 42 DEG C of carrier gas, another part through cooling, be dehydrated the carrier gas to obtain temperature and be lower than 40 DEG C；(6) separated after the solid particle mixing that carrier gas of the temperature lower than 40 DEG C is discharged with warehouse bottom, obtain clean carrier gas and dry material product；(7) after clean carrier gas is mixed with the carrier gas that most of carrier gas and temperature are lower than 42 DEG C, it is pressurized, is heated into spray tower.Energy consumption of the present invention is small, exhaust gas discharge capacity is small and product quality is high.
Description
Technical field
The present invention relates to food processing, energy-saving and safety and environmental protection technical field more particularly to a kind of nitrogen are closed
Recycle corn pulp spray drying energy conservation and product method for upgrading.
Background technique
Corn pulp is that one of production of corn starch process by-product using sulfurous acid soaking corn particle pumps out leaching
It is soaked to contain dry matter 6% ~ 7%, the yellowish-brown liquid to 40% ~ 50% is finally concentrated by evaporation by multiple-effect vacuum.
Spray dryer is the ideal drier of processing solution, suspension or muddy material.It is in hothouse
The dry liquid of needs is atomized into fine droplet by atomizer, and is in direct contact with it, mixes by dried medium hot wind
Come complete heat transfer and mass transfer process, evaporate moisture rapidly, achieve the purpose that dry.Corn starch after drying is in addition to conduct
One of good animal feed, and prepare the raw material of pharmaceuticals industries such as alcohols and capsule shells, utility value with higher.
Currently, conventional corn pulp spray drying process mostly uses air open-circuit system to see attached drawing 1, there are energy consumptions high, oxidizable, high temperature
The disadvantages of easy spontaneous combustion and more exhaust gas discharge.
Summary of the invention
The nitrogen that technical problem to be solved by the invention is to provide a kind of energy consumptions is small, product quality is high and exhaust gas discharge capacity is small
Sealing and circulating corn pulp spray drying energy conservation and product method for upgrading.
To solve the above problems, a kind of nitrogen sealing and circulating corn pulp spray drying energy conservation of the present invention and product mention
Matter method, comprising the following steps:
(1) previous process temperature enters in head tank for the corn syrup of 50 ~ 60 DEG C, 40 ~ 50%(wt of solid content), the charging
The corn syrup of tank tank bottom outflow is sent in the pressure nozzle of spraying column overhead through metering pump pressurization；Meanwhile temperature be 180 ~
200 DEG C of heat carrier is after two layers of gas distribution grid in the spray tower tower is uniform with the pressure nozzle with 3 ~ 5MPa pressure
The Filamentous or cotton-shaped droplet that power sprays is flowed by cocurrent mode to the spray tower tower bottom；The heat carrier is contacted with the droplet
Afterwards, transmitting heat makes the moisture in the droplet vaporize and dry rapidly, and respectively obtaining the temperature containing fine powder is 100 ~ 110 DEG C
Hot carrier gas and temperature be 90 ~ 95 DEG C of Dried Corn Steep Liquor Powder；The Dried Corn Steep Liquor Powder that the temperature is 90 ~ 95 DEG C passes through rotary valve I
It is transported in warehouse；
(2) the hot carrier gas that the temperature containing fine powder is 100 ~ 110 DEG C enters in cyclone separator, after separation respectively
To fine powder and hot carrier gas；The fine powder is transported in the warehouse by rotary valve II；
(3) the hot carrier gas is discharged by the cyclone separator top, and wherein most carrier gas enters circulating line and followed
Ring utilizes；Remaining part enters in scrubbing tower, under the action of shower water, respectively obtains the condensation that temperature is 50 ~ 60 DEG C
The carrier gas of liquid, temperature lower than 42 DEG C and sewage；The sewage is discharged by the scrubbing tower tower bottom；
(4) the condensate liquid that the temperature is 50 ~ 60 DEG C is pressed into heat exchanger through water circulating pump and exchanges heat, and obtains temperature and is lower than
33 DEG C of liquid, liquid of the temperature lower than 33 DEG C return to the hot carrier gas of circulated sprinkling in the scrubbing tower；
(5) a part of carrier gas in carrier gas of the temperature lower than 42 DEG C enters the circulating line and is recycled, separately
A part of carrier gas then enters cooler and cools down again, obtains the carrier gas that temperature is lower than 25 DEG C, and carrier gas of the temperature lower than 25 DEG C passes through
It crosses after moisture trap removes extra moisture, obtains the carrier gas that temperature is lower than 40 DEG C；
(6) carrier gas of the temperature lower than 40 DEG C is consolidated after blower with what warehouse bottom rotary valve III was discharged
Body particle mixes, which is transported in product cyclone separator while cooling and is separated, and respectively obtains clean load
Gas and dry material product；The dry material product is transported to next work through the rotary valve IV of product cyclone separator bottom
Sequence；
(7) the clean carrier gas is escaped into the circulating line at the top of the product cyclone separator, and with enter institute
State the step of circulating line (3) in most of carrier gas and the step (5) in a part of temperature be lower than 42 DEG C of carrier gas
Mixing, while so that its oxygen content is no more than 5% into the circulating line through nitrogen pick-up pipeline input nitrogen, obtaining after mixing
Temperature is lower than 90 DEG C of carrier gas, and carrier gas of the temperature lower than 90 DEG C through heater is heated to 180 ~ 200 DEG C after being pressurized by air-introduced machine
Into the hothouse of the spray tower.
The step (1) in metering pump refer to any one in the positive displacement pump met the requirements.
The step (3) in scrubbing tower refer to any one in packed tower, plate column or spray column.
The step (4) in heat exchanger and the step (5) in the pattern of cooler be shell-and-tube, be board-like, finned
Any one.
The step (7) in heater medium refer to any one in steam, conduction oil or electricity.
Compared with the prior art, the present invention has the following advantages:
1, exhaust gas discharge capacity is small.
Drying system of the present invention is designed as hermetically sealed system, and the leakage of system is small.It mainly include a small amount of acid in dry tail gas
Property gas, water and nitrogen etc., high-temperature tail gas discharges a small amount of fixed gas after scrubbing tower is handled, and the nitrogen of system is maintained to contain
Amount.
2, wastewater displacement is small.
The cooling water that the shower water of scrubbing tower is all got off using spray drying tail gas condensing in the present invention, and continuous circulation
It uses, therefore discharge of wastewater is mainly the moisture that corn pulp dries out.
3, energy-saving.
Under the premise of certain humidity, most of carrier gas is recycled control loop gas of the present invention, a small amount of carrier gas cooling
Extra water is removed, heating room is entered after carrier gas Hybrid Heating, the calorific value of recyclegas is adequately utilized, improves thermal effect
Rate.2000kg/h wet stock is handled, wet stock moisture content is 60%, air open-circuit system and nitrogen closed circuit circulatory system power consumption values
Compare and is shown in Table 1.
Table 1, power consumption values compare
4, safety and environmental protection, good product quality.
In drying system of the present invention, using nitrogen closed circulating system, avoid spontaneous combustion that dried material may occur or
The harm such as explosion, furthermore waste water and gas discharge capacity is small, therefore production process safety and environmental protection.The system strict control oxygen content, prevents
Phenomena such as being oxidized in material high-temperature drying procedures.Material after drying is in such a way that cold carrier gas stream conveys, not only
It can be granulated with cold wind, the moisture content in product can also be reduced, prevented the moisture absorption and mouldy, improve the quality of product.
5, process of the present invention is simple, process stabilizing, is suitble to industries, the especially thermal sensitivity such as chemical industry, food and pharmacy or easily
Oxidation material is conducive to be widely popularized.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 is the air open-circuit system that ordinary maize starches spray drying process.
Fig. 2 is structural schematic diagram of the invention.
In figure: 1- head tank；2- metering pump；3- spray tower；4- cyclone separator；5- rotary valve I；6- rotary valve II；7-
Warehouse；8- rotary valve III；9- scrubbing tower；10- water circulating pump；11- heat exchanger；12- air-introduced machine；13- heater；14- cooler；
15- moisture trap；16- air blower；17- product cyclone separator；18- rotary valve IV.
Specific embodiment
As shown in Fig. 2, a kind of nitrogen sealing and circulating corn pulp spray drying energy conservation and product method for upgrading, including following step
It is rapid:
(1) previous process temperature is 50 ~ 60 DEG C, 40 ~ 50%(wt of solid content) corn syrup enter in head tank 1, should be into
The corn syrup of 1 tank bottom of batch can outflow is sent in the pressure nozzle of 3 tower top of spray tower through the pressurization of metering pump 2；Meanwhile temperature is
180 ~ 200 DEG C of heat carrier is after two layers of gas distribution grid in 3 tower of spray tower is uniform with pressure nozzle with 3 ~ 5MPa pressure
The Filamentous or cotton-shaped droplet of ejection is flowed by cocurrent mode to 3 tower bottom of spray tower；After heat carrier is contacted with droplet, transmitting is hot rapidly
Amount makes the moisture in droplet vaporize and dry, and respectively obtains the temperature containing fine powder as 100 ~ 110 DEG C of hot carrier gas and temperature and is
90 ~ 95 DEG C of Dried Corn Steep Liquor Powder；The Dried Corn Steep Liquor Powder that temperature is 90 ~ 95 DEG C is transported in warehouse 7 by rotary valve I 5.
Wherein: metering pump 2 refers to any one in the positive displacement pump met the requirements.
(2) the hot carrier gas that the temperature containing fine powder is 100 ~ 110 DEG C enters in cyclone separator 4, after separation respectively
To fine powder and hot carrier gas；Fine powder is transported in warehouse 7 by rotary valve II 6.
(3) hot carrier gas is discharged by 4 top of cyclone separator, and wherein most carrier gas enters circulating line and recycled
It utilizes；Remaining part enters in scrubbing tower 9, under the action of shower water, respectively obtains the condensation that temperature is 50 ~ 60 DEG C
The carrier gas of liquid, temperature lower than 42 DEG C and sewage；Sewage is discharged by 9 tower bottom of scrubbing tower.
Wherein: scrubbing tower 9 refers to any one in packed tower, plate column or spray column.
(4) the condensate liquid that temperature is 50 ~ 60 DEG C is pressed into heat exchanger 11 through water circulating pump 10 and exchanges heat, and obtains temperature and is lower than
33 DEG C of liquid, liquid of the temperature lower than 33 DEG C return to the hot carrier gas of circulated sprinkling in scrubbing tower 9.
Wherein: the pattern of heat exchanger 11 be shell-and-tube, it is board-like, finned in any one.
(5) a part of carrier gas in carrier gas of the temperature lower than 42 DEG C enters circulating line and is recycled, and another part carries
Gas then enters cooler 14 and cools down again, obtains the carrier gas that temperature is lower than 25 DEG C, and air water is passed through in carrier gas of the temperature lower than 25 DEG C
After separator 15 removes extra moisture, the carrier gas that temperature is lower than 40 DEG C is obtained.
Wherein: the pattern of cooler 14 be shell-and-tube, it is board-like, finned in any one.
(6) solid of carrier gas of the temperature lower than 40 DEG C after the pressurization of air blower 16 with the discharge of 7 bottom rotary valve III 8 of warehouse
Grain mixes, which is transported in product cyclone separator 17 while cooling and is separated, and respectively obtains clean carrier gas
With dry material product；Dry material product is transported to subsequent processing through the rotary valve IV 18 of 17 bottom of product cyclone separator.
(7) clean carrier gas is escaped into circulating line, and the step with entrance circulating line at the top of product cyclone separator 17
Suddenly (3) in most of carrier gas and step (5) in carrier gas of a part of temperature lower than 42 DEG C mix, while inputting nitrogen through nitrogen pick-up pipeline
To in the circulating line, its oxygen content is made to be no more than 5%, obtain the carrier gas that temperature is lower than 90 DEG C after mixing, the temperature is low
180 ~ 200 DEG C of hothouses for entering spray tower 3 are heated to through heater 13 after 90 DEG C of carrier gas are pressurized by air-introduced machine 12.
Wherein: 13 medium of heater refers to any one in steam, conduction oil or electricity.
Claims (5)
1. a kind of nitrogen sealing and circulating corn pulp spray drying energy conservation and product method for upgrading, comprising the following steps:
(1) previous process temperature is 50~60 DEG C, the corn syrup of solid content 40~50% enters in head tank (1), the head tank
(1) corn syrup of tank bottom outflow is sent in the pressure nozzle of spray tower (3) tower top through metering pump (2) pressurization；Meanwhile temperature
For 180~200 DEG C of heat carriers by two layers gas distribution grid in the spray tower (3) tower uniformly after and the pressure nozzle
It is flowed in such a way that the Filamentous or cotton-shaped droplet that 3~5MPa pressure sprays is by cocurrent to the spray tower (3) tower bottom；The heat carrier
After contacting with the droplet, transmitting heat rapidly makes the moisture in the droplet vaporize and dry, and respectively obtains containing fine powder
The Dried Corn Steep Liquor Powder that the heat carrier and temperature that temperature is 100~110 DEG C are 90~95 DEG C；The corn that the temperature is 90~95 DEG C
Paste dry powder is transported in warehouse (7) by rotary valve I (5)；
(2) the heat carrier that the temperature containing fine powder is 100~110 DEG C enters in cyclone separator (4), after separation respectively
To fine powder and hot carrier gas；The fine powder is transported in the warehouse (7) by rotary valve II (6)；
(3) the hot carrier gas is discharged by the cyclone separator (4) top, and wherein most carrier gas enters circulating line and followed
Ring utilizes；Remaining part enters in scrubbing tower (9), and under the action of shower water, respectively obtaining temperature is 50~60 DEG C
The carrier gas of condensate liquid, temperature lower than 42 DEG C and sewage；The sewage is discharged by the scrubbing tower (9) tower bottom；
(4) the condensate liquid that the temperature is 50~60 DEG C is pressed into heat exchanger (11) through water circulating pump (10) and exchanges heat, and obtains temperature
Liquid lower than 33 DEG C, liquid of the temperature lower than 33 DEG C return to the hot carrier gas of circulated sprinkling in the scrubbing tower (9)；
(5) a part of carrier gas in carrier gas of the temperature lower than 42 DEG C enters the circulating line and is recycled, another portion
Load sharing gas then enters cooler (14) and cools down again, obtains the carrier gas that temperature is lower than 25 DEG C, and carrier gas of the temperature lower than 25 DEG C passes through
After crossing the extra moisture of moisture trap (15) removing, the carrier gas that temperature is lower than 40 DEG C is obtained；
(6) carrier gas of the temperature lower than 40 DEG C is arranged after air blower (16) pressurization with the warehouse (7) bottom rotary valve III (8)
Solid particle out mixes, which is transported in product cyclone separator (17) while cooling and is separated, respectively
Obtain clean carrier gas and dry material product；Rotary valve IV of the dry material product through product cyclone separator (17) bottom
(18) it is transported to subsequent processing；
(7) the clean carrier gas is escaped into the circulating line at the top of the product cyclone separator (17), and with enter institute
State the step of circulating line (3) in most of carrier gas and the step (5) in a part of temperature be lower than 42 DEG C of carrier gas
Mixing, while so that its oxygen content is no more than 5% into the circulating line through nitrogen pick-up pipeline input nitrogen, after mixing
It is lower than 90 DEG C of carrier gas to temperature, carrier gas of the temperature lower than 90 DEG C after air-introduced machine (12) pressurization through heater (13) by being heated to
180~200 DEG C of hothouses into the spray tower (3).
2. a kind of nitrogen sealing and circulating corn pulp spray drying energy conservation as described in claim 1 and product method for upgrading, special
Sign is: the step (1) in metering pump (2) refer to any one in the positive displacement pump met the requirements.
3. a kind of nitrogen sealing and circulating corn pulp spray drying energy conservation as described in claim 1 and product method for upgrading, special
Sign is: the step (3) in scrubbing tower (9) refer to any one in packed tower, plate column or spray column.
4. a kind of nitrogen sealing and circulating corn pulp spray drying energy conservation as described in claim 1 and product method for upgrading, special
Sign is: the step (4) in the pattern of heat exchanger (11) and the step (5) middle cooler (14) be shell-and-tube, board-like, wing
Any one in chip.
5. a kind of nitrogen sealing and circulating corn pulp spray drying energy conservation as described in claim 1 and product method for upgrading, special
Sign is: the step (7) in heater (13) medium refer to any one in steam, conduction oil or electricity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610909714.3A CN106512453B (en) | 2016-10-19 | 2016-10-19 | A kind of nitrogen sealing and circulating corn pulp spray drying energy conservation and product method for upgrading |
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|---|---|---|---|
| CN201610909714.3A CN106512453B (en) | 2016-10-19 | 2016-10-19 | A kind of nitrogen sealing and circulating corn pulp spray drying energy conservation and product method for upgrading |
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| CN106512453A CN106512453A (en) | 2017-03-22 |
| CN106512453B true CN106512453B (en) | 2019-03-19 |
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| CN109126495B (en) * | 2018-07-09 | 2021-06-01 | 山东微研生物科技有限公司 | Energy-concerving and environment-protective type vitamin B2 drying device |
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