CN115245687A - Five-effect evaporation system for sugar production and use method - Google Patents
Five-effect evaporation system for sugar production and use method Download PDFInfo
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- CN115245687A CN115245687A CN202210776401.0A CN202210776401A CN115245687A CN 115245687 A CN115245687 A CN 115245687A CN 202210776401 A CN202210776401 A CN 202210776401A CN 115245687 A CN115245687 A CN 115245687A
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- 238000001704 evaporation Methods 0.000 title claims abstract description 254
- 230000008020 evaporation Effects 0.000 title claims abstract description 158
- 235000000346 sugar Nutrition 0.000 title claims abstract description 64
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title abstract description 17
- 235000011389 fruit/vegetable juice Nutrition 0.000 claims abstract description 235
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 107
- 239000006188 syrup Substances 0.000 claims abstract description 18
- 235000020357 syrup Nutrition 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims description 69
- 235000021552 granulated sugar Nutrition 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 5
- 206010033546 Pallor Diseases 0.000 claims description 4
- 239000011552 falling film Substances 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims description 2
- 238000012546 transfer Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 8
- 235000016068 Berberis vulgaris Nutrition 0.000 description 7
- 241000335053 Beta vulgaris Species 0.000 description 7
- 238000009833 condensation Methods 0.000 description 6
- 230000005494 condensation Effects 0.000 description 6
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 235000013311 vegetables Nutrition 0.000 description 5
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 4
- 229930006000 Sucrose Natural products 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 235000007201 Saccharum officinarum Nutrition 0.000 description 3
- 240000000111 Saccharum officinarum Species 0.000 description 3
- 238000009835 boiling Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000007738 vacuum evaporation Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 241000219310 Beta vulgaris subsp. vulgaris Species 0.000 description 1
- CZMRCDWAGMRECN-UHFFFAOYSA-N Rohrzucker Natural products OCC1OC(CO)(OC2OC(CO)C(O)C(O)C2O)C(O)C1O CZMRCDWAGMRECN-UHFFFAOYSA-N 0.000 description 1
- 235000021536 Sugar beet Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 235000021551 crystal sugar Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 235000012907 honey Nutrition 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
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- 239000007787 solid Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
- C13B25/00—Evaporators or boiling pans specially adapted for sugar juices; Evaporating or boiling sugar juices
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- Chemical & Material Sciences (AREA)
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Abstract
The invention provides a five-effect evaporation system for sugar production and a using method thereof, belonging to the technical field of sugar production, wherein the five-effect evaporation system for sugar production comprises a heater assembly, an evaporation tank assembly, a condensed water self-evaporation assembly and a syrup balancing tank, wherein the inlet of a first-level dilute juice heater in the heater assembly is connected with a juice inlet pipe for sugar juice; the juice inlet pipe of the fourth-effect evaporation tank in the evaporation tank assembly is connected with the outlet of the dilute juice second-stage heater, the juice outlet pipe is connected with the inlet of the dilute juice third heater through a sugar juice pump, the outlet of the dilute juice fifth heater is connected with the juice inlet pipe of the first-effect evaporation tank, the condensed water is used for storing the condensed water from the first-effect evaporation tank to the fifth-effect evaporation tank from the evaporation assembly, and the first-effect condensed water bag comprises three water bags connected in series.
Description
Technical Field
The invention relates to the technical field of sugar production, in particular to a five-effect evaporation system for sugar production and a using method thereof.
Background
The sugar production refers to the production activities of producing finished sugar by taking sugarcane and beet as raw materials and refining and processing various refined sugars by taking raw sugar or granulated sugar as raw materials. Including raw sugar made from sugarcane, and sugar made from sugarcane, such as white sugar, soft white sugar, brown granulated sugar (brown sugar), and yellow granulated sugar; sugar beet product sugar, such as white sugar and soft white sugar; processed sugar such as crystal sugar, cube sugar, refined syrup, refined granulated sugar, etc.; orange water and other sugar-making byproducts.
In the production process of sugar by using beet as raw material, after the beet is pretreated, the beet is cut into vegetable shreds by a shredder, and then the vegetable shreds are fed into an exudator to exude sugar juice. Removing residue, weighing, cleaning with bicarbonic acid method to obtain clear juice, evaporating, boiling sugar, crystallizing, separating honey, drying, and packaging.
The reasons for the high steam consumption in the evaporation process mainly include the following points: 1. the unreasonable distribution of the juice steam can utilize the steam utilization unit of the low-quality juice steam, and the high-quality juice steam is used, so that the total steam consumption is increased; 2. the low-heat-value heat source can not be fully and reasonably utilized, for example, the waste heat of condensed water is fully utilized, the juice steam of a last-effect evaporation tank and the juice steam of a crystallization tank are reasonably utilized, the self-evaporation steam of the condensed water is utilized, and the like; 3. evaporation and heating equipment falls behind, the heat transfer efficiency is low, the heat loss is large, the evaporation tank still adopts a standard type, and the heater still adopts a tube array type; 4. the dilute juice calcium salt content is higher, and an evaporation tank and a heater are easy to scale, so that the heat transfer efficiency is reduced.
At present, the evaporation process of most beet sugar factories in China adopts a four-effect low-vacuum evaporation thermodynamic scheme, the total steam consumption of the scheme is generally more than 38 percent (for beet), only a few large-scale sugar factories adopt a five-effect vacuum evaporation scheme, but the total steam consumption is also more than 35 percent (for beet). Although the traditional five-effect vacuum evaporation scheme consumes less steam than the four-effect evaporation scheme, the heat energy generated in the evaporation process cannot be reasonably utilized, so that the heat energy is greatly wasted.
Disclosure of Invention
The embodiment of the invention provides a five-effect evaporation system for sugar making, and aims to solve the problem that the existing five-effect evaporation system for sugar making cannot effectively utilize waste heat.
The embodiment of the invention provides a five-effect evaporation system for sugar production, which comprises a heater assembly, an evaporation tank assembly, a condensed water self-evaporation assembly and a syrup balancing tank.
The heater assembly comprises a first-level thin juice heater, a second-level thin juice heater, a third-level thin juice heater, a fourth-level thin juice heater and a fifth-level thin juice heater, an inlet of the first-level thin juice heater is connected with the sugar juice inlet pipe, an outlet of the first-level thin juice heater is connected with an inlet of the second-level thin juice heater, and the third-level thin juice heater, the fourth-level thin juice heater and the fifth-level thin juice heater are sequentially connected.
The evaporating pot subassembly includes first effect evaporating pot, the second is imitated the evaporating pot, the third is imitated the evaporating pot, the fourth is imitated the evaporating pot, fifth is imitated evaporating pot and sugar juice pump, the juice pipe of advancing of fourth effect evaporating pot and the exit linkage of thin juice second grade heater, the play juice pipe of fourth effect evaporating pot passes through sugar juice pump and thin juice tertiary heater entry linkage, the export of thin juice fifth grade heater and the juice union coupling that advances of first effect evaporating pot, the second is imitated the evaporating pot, the play juice mouth and the juice pipe of advancing of third effect evaporating pot and fifth are connected gradually.
The steam inlet of the first-effect evaporating pot is connected with a positive steam supply pipe, the juice steam outlet of the first-effect evaporating pot is connected with the steam inlet of the second-effect evaporating pot and the heat source of the thin juice five-level heater, the juice steam outlet of the second-effect evaporating pot is connected with the steam inlet of the third-effect evaporating pot, the heat source of the thin juice four-level heater, the heat source of a crystal washing pot and the heat source of granulated sugar drying, the juice steam outlet of the third-effect evaporating pot is connected with the steam inlet of the fourth-effect evaporating pot, the heat source of the thin juice two-level heater, the heat source of the seeped juice two-level blanching device, the heat source of the thin juice one-level heater, the heat source of the grey juice four-level heater, the heat source of the seeping device and the heat source of the crystallizing pot, and the juice steam outlet of the fifth-level evaporator is connected with the grey juice two-level heater and the condenser.
The condensed water self-evaporation component comprises a first-effect condensed water bag, a second-effect condensed water bag, a third-effect condensed water bag, a fourth-effect condensed water bag and a fifth-effect condensed water bag, the first-effect condensed water bag, the second-effect condensed water bag, the third-effect condensed water bag, the fourth-effect condensed water bag and the fifth-effect condensed water bag are respectively used for storing condensed water of a first-effect evaporation tank, a second-effect evaporation tank, a third-effect evaporation tank, a fourth-effect evaporation tank and a fifth-effect evaporation tank, the first-effect condensed water bag comprises three series-connected water bags, the condensed water discharged from the first-effect evaporation tank can sequentially pass through the three series-connected water bags, a first-level dilute juice heater and a third-level grey juice heater and is finally used for boiler water of a power plant, and the condensed water discharged from the second-effect evaporation tank can sequentially pass through the second-effect condensed water bag, the third-effect condensed water bag, the fourth-effect condensed water bag, the fifth-effect condensed water bag, a first-level percolate heater and a whole-plant heater and finally stored in a hot water tank.
The syrup balancing tank is used for storing syrup flowing out from the juice outlet of the fifth-effect evaporation tank.
In the embodiment, the inlet of the thin juice primary heater in the heater assembly is connected with the sugar juice inlet pipe; the juice pipe that advances of fourth effect evaporating pot and the exit linkage of thin juice secondary heater in the evaporating pot subassembly, go out the juice pipe and pass through sugar juice pump and thin juice third heater entry linkage, the export of thin juice fifth heater is connected with the juice pipe that advances of first effect evaporating pot, the condensate water is used for storing the condensate water of first effect to fifth effect evaporating pot from the evaporating pot subassembly, and a effect condensate water package contains three water drum of establishing ties, through the setting of this system, can utilize the reaction waste heat at different levels among the evaporation process effectively, play energy-conserving effect.
In one embodiment of the invention, the first-effect evaporation tank, the second-effect evaporation tank, the third-effect evaporation tank, the fourth-effect evaporation tank and the fifth-effect evaporation tank all use falling film type effect evaporation tanks.
In this example, the use of falling film evaporators results in evaporators with high heat transfer coefficients, slow fouling formation, no static pressure temperature differential losses, and can be operated at lower temperatures.
In one embodiment of the invention, the first-level dilute juice heater, the second-level dilute juice heater, the third-level dilute juice heater, the fourth-level dilute juice heater and the fifth-level dilute juice heater all use plate heat exchangers.
In the embodiment, the plate heat exchanger is used, so that the heat transfer efficiency of each heater is 2-4 times higher than that of a shell-and-tube heater, and the heat transfer efficiency can be greatly improved.
The embodiment of the invention also provides a use method of the five-effect evaporation system for sugar production, which utilizes the five-effect evaporation system for sugar production of the above embodiments and comprises the following steps:
s1, temperature setting: setting the positive steam temperature and the juice steam outlet temperatures of the first-effect evaporating pot, the second-effect evaporating pot, the third-effect evaporating pot, the fourth-effect evaporating pot and the fifth-effect evaporating pot to be 132.9 ℃, 126.7 ℃, 120.2 ℃, 113.0 ℃ and 105.0 ℃ respectively;
s2, starting all parts of the system, introducing the sugar juice which needs to be evaporated and concentrated into a dilute juice primary heater, and enabling the flowing sequence of the sugar juice to be as follows: the juice extractor comprises a first-level thin juice heater, a second-level thin juice heater, a fourth-effect evaporating pot, a sugar juice pump, a third-level thin juice heater, a fourth-level thin juice heater, a fifth-level thin juice heater, a first-effect evaporating pot, a second-effect evaporating pot, a third-effect evaporating pot and a fifth-effect evaporating pot;
and S3, finally, collecting the syrup obtained from the fifth effect evaporation tank in a syrup balancing tank.
By adopting the use method of the five-effect evaporation system for sugar production, which is mentioned in the embodiment, the sugar juice is changed from the traditional advanced one-effect evaporation tank to the advanced four-effect evaporation tank. The feeding mode has the advantages that the supply amount of the four-effect juice steam is ensured, and the steam using unit using the three-effect juice steam is changed into the four-effect juice steam. Meanwhile, because the sugar juice directly enters the five-effect tank from the three-effect tank, the evaporation capacity of the sugar juice in the five-effect tank is increased compared with that of the conventional feeding mode because the temperature of the three-effect juice is higher than the boiling point of the five-effect, the sugar juice brix is favorably improved, the requirement of using a large amount of five-effect low-quality juice steam can be met, the total steam consumption in the sugar-making evaporation process is reduced to 25.2 percent from the original 35 percent to more than 25.2 percent to vegetables, and the purpose of saving energy is achieved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a working principle diagram of a five-effect evaporation system for sugar production according to an embodiment of the present invention.
Icon: 10-a five-effect evaporation system for sugar manufacturing; 100-a heater assembly; 110-thin juice first-level heater; 120-dilute juice secondary heater; 130-a thin juice three-level heater; 140-thin juice four-stage heater; 150-thin juice five-stage heater; 300-an evaporator tank assembly; 310-first effect evaporator tank; 320-a second effect evaporation tank; 330-third effect evaporating pot; 340-fourth effect evaporation tank; 350-a fifth effect evaporator tank; 360-sugar juice pump; 500-condensed water self-evaporation component; 510-one effect condensation water bag; 511-tandem water; 520-double effect condensation water; 530-triple effect condensate; 540-four-effect condensation water; 550-five-effect condensation water bag; 700-syrup balancing tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without inventive efforts based on the embodiments of the present invention, are within the scope of protection of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Examples
Referring to fig. 1, the present invention provides a five-effect evaporation system 10 for sugar production, comprising a heater assembly 100, an evaporation tank assembly 300, a condensed water self-evaporation assembly 500, and a syrup balancing tank 700.
Referring to fig. 1 again, the heater assembly 100 includes a first-stage dilute juice heater 110, a second-stage dilute juice heater 120, a third-stage dilute juice heater 130, a fourth-stage dilute juice heater 140 and a fifth-stage dilute juice heater 150, wherein an inlet of the first-stage dilute juice heater 110 is connected to a juice inlet pipe, i.e., an inlet of the first-stage dilute juice heater 110, and an outlet of the first-stage dilute juice heater 110 is connected to an inlet of the second-stage dilute juice heater 120, and it can be understood that the juice first enters the first-stage dilute juice heater 110, and is subjected to first-stage heating and then enters the second-stage dilute juice heater 120 for second-stage heating. Meanwhile, the thin juice third-stage heater 130, the thin juice fourth-stage heater 140 and the thin juice fifth-stage heater 150 are connected in sequence.
Referring to fig. 1, the evaporation tank assembly 300 includes a first-effect evaporation tank 310, a second-effect evaporation tank 320, a third-effect evaporation tank 330, a fourth-effect evaporation tank 340, a fifth-effect evaporation tank 350, and a juice pump 360, specifically, a juice inlet pipe of the fourth-effect evaporation tank 340 is connected to an outlet of the second-order heater 120, that is, the juice is heated by the first-order heater 110 and the second-order heater 120 and then introduced into the fourth-effect evaporation tank 340, and a juice outlet pipe of the fourth-effect evaporation tank 340 is connected to an inlet of the third-order heater 130 through the juice pump 360, so that the juice can be heated by the third-order heater 130, the fourth-order heater 140, and the fifth-order heater 150 in sequence after the juice enters the third-order heater 130. The outlet of the thin juice five-stage heater 150 is connected with the juice inlet pipe of the first effect evaporating pot 310, the juice outlets of the first effect evaporating pot 310, the second effect evaporating pot 320, the third effect evaporating pot 330 and the fifth effect evaporating pot 350 are sequentially connected with the juice inlet pipe, that is, after being heated by the thin juice five-stage heater 150, the sugar juice can sequentially enter the first effect evaporating pot 310, the second effect evaporating pot 320, the third effect evaporating pot 330 and the fifth effect evaporating pot 350.
Specifically, a steam inlet of the first-effect evaporation tank 310 is connected with a positive steam supply pipe, and a juice steam outlet of the first-effect evaporation tank 310 is connected with a steam inlet of the second-effect evaporation tank 320 and a heat source of the dilute juice fifth-level heater 150, and it can be understood that the juice steam of the first-effect evaporation tank 310 can be used as a steam source of the second-effect evaporation tank 320 and a heat source of the dilute juice fifth-level heater 150; a juice steam outlet of the second-effect evaporation tank 320 is connected with a steam inlet of the third-effect evaporation tank 330, a heat source of the thin-juice four-stage heater 140, a heat source of the crystallization tank washer and a heat source of granulated sugar drying, and similarly, the juice steam of the second-effect evaporation tank 320 can be used as a steam source of the third-effect evaporation tank 330, a heat source of the thin-juice four-stage heater 140, a heat source of the crystallization tank washer and a heat source of the granulated sugar drying; the juice steam outlet of the third-effect evaporation tank 330 is connected with the steam inlet of the fourth-effect evaporation tank 340, the heat source of the thin juice third-level heater 130 and the heat source of the clear juice second-level heater, that is, the juice steam of the third-effect evaporation tank 330 can be used as the steam source of the fourth-effect evaporation tank 340, the heat source of the thin juice third-level heater 130 and the heat source of the clear juice second-level heater; a juice steam outlet of the fourth effect evaporation tank 340 is connected with a steam inlet of the fifth effect evaporation tank 350, a heat source of the dilute juice secondary heater 120, a heat source of the exuded juice secondary blanching device, a heat source of the clear juice primary heater, a heat source of the gray juice fourth-level heater, a heat source of the exuding device and a heat source of the crystallization tank, and similarly, the juice steam of the fourth effect evaporation tank 340 can be used for a steam source of the fifth effect evaporation tank 350, a heat source of the dilute juice secondary heater 120, a heat source of the exuded juice secondary blanching device, a heat source of the clear juice primary heater, a heat source of the gray juice fourth-level heater, a heat source of the exuding device and a heat source of the crystallization tank; the juice steam outlet of the fifth-effect evaporation tank 350 is connected with the heat source of the secondary ash juice heater and the condenser, that is, the juice steam of the fifth-effect evaporation tank 350 can be supplied to the heat source of the secondary ash juice heater and the condenser for use.
Referring to fig. 1, the condensate self-evaporation assembly 500 includes a first-effect condensate water bag 510, a second-effect condensate water bag 520, a third-effect condensate water bag 530, a fourth-effect condensate water bag 540 and a fifth-effect condensate water bag 550, wherein the first-effect condensate water bag 510, the second-effect condensate water bag 520, the third-effect condensate water bag 530, the fourth-effect condensate water bag 540 and the fifth-effect condensate water bag 550 are respectively used for storing the condensate of the first-effect evaporation tank 310, the second-effect evaporation tank 320, the third-effect evaporation tank 330, the fourth-effect evaporation tank 340 and the fifth-effect evaporation tank 350. Meanwhile, the first-effect condensation water drum 510 comprises three series water drums 511, so that the condensation water discharged from the first-effect evaporation tank 310 can sequentially pass through the three series water drums 511 and gradually release heat, then pass through the dilute juice first-stage heater 110 and the lye third-stage heater, and finally enter a power plant as boiler water when the temperature is reduced to about 80 ℃.
Specifically, the self-evaporation steam of the first series of water bags 511 can be introduced into the first effect evaporation tank 310 again to be used as evaporation steam, the self-evaporation steam of the second series of water bags 511 can be introduced into the second effect evaporation tank 320 to be used as evaporation steam, and the self-evaporation steam of the third series of water bags 511 can be introduced into the third effect evaporation tank 330 to be used as evaporation steam.
The condensed water discharged from the second-effect evaporation tank 320 can sequentially pass through the second-effect condensed water drum 520, the third-effect condensed water drum 530, the fourth-effect condensed water drum 540, the fifth-effect condensed water drum 550, the first-stage oozed juice scalding device and the whole plant heater and is finally stored in the hot water tank, and it can be understood that the condensed water of the second-effect evaporation tank 320, the third-effect evaporation tank 330, the fourth-effect evaporation tank 340 and the fifth-effect evaporation tank 350 can be used for oozing out the heat source of the first-stage oozed juice scalding device and then is introduced into the whole plant heater to be used as a heating source, and finally, when the water temperature is reduced to about 60 ℃, the condensed water is stored in the hot water tank and is used for daily hot water.
Meanwhile, the self-evaporation steam of the two-effect condensate water drum 520, the three-effect condensate water drum 530, the four-effect condensate water drum 540 and the five-effect condensate water drum 550 can return to the second-effect evaporation tank 320, the third-effect evaporation tank 330, the fourth-effect evaporation tank 340 and the fifth-effect evaporation tank 350 as evaporation steam, respectively.
Referring to fig. 1, the syrup balancing tank 700 is connected to the juice outlet of the fifth effect evaporation tank 350, and can be used for storing the syrup which flows out from the juice outlet after the evaporation treatment of the fifth effect evaporation tank 350, and the syrup can be used for the next sugar boiling operation.
In a specific embodiment, the first-effect evaporation tank 310, the second-effect evaporation tank 320, the third-effect evaporation tank 330, the fourth-effect evaporation tank 340 and the fifth-effect evaporation tank 350 all use falling-film-type-effect evaporation tanks, and the falling-film-type-effect evaporation tanks are used, so that the heat transfer coefficients of the evaporation tanks are high, the generation of scales is slow, no static pressure temperature difference loss exists, and the operation can be performed at a lower temperature.
In another specific embodiment, the first dilute juice heater 110, the second dilute juice heater 120, the third dilute juice heater 130, the fourth dilute juice heater 140 and the fifth dilute juice heater 150 all use plate heat exchangers, and the use of the plate heat exchangers enables the heat transfer efficiency of each heater to be 2-4 times higher than that of a shell-and-tube heater, so that the heat transfer efficiency can be greatly improved.
The invention also provides a use method of the five-effect evaporation system 10 for sugar production, in particular to the five-effect evaporation system for sugar production, which can utilize the above embodiments, and comprises the following steps:
s1, temperature setting: setting the positive steam temperature and the juice steam outlet temperatures of the first-effect evaporating pot 310, the second-effect evaporating pot 320, the third-effect evaporating pot 330, the fourth-effect evaporating pot 340 and the fifth-effect evaporating pot 350 as 132.9 ℃, 126.7 ℃, 120.2 ℃, 113.0 ℃ and 105.0 ℃ respectively;
s2, starting all parts of the system, and introducing the sugar juice to be evaporated and concentrated into a dilute juice primary heater 110 to ensure that the flow sequence of the sugar juice is as follows: a first-level thin juice heater 110, a second-level thin juice heater 120, a fourth-effect evaporating pot 340, a sugar juice pump 360, a third-level thin juice heater 130, a fourth-level thin juice heater 140, a fifth-level thin juice heater 150, a first-effect evaporating pot 310, a second-effect evaporating pot 320, a third-effect evaporating pot 330 and a fifth-effect evaporating pot 350;
and S3, finally, collecting the syrup obtained from the fifth effect evaporation tank 350 in a syrup balancing tank 700.
In a specific embodiment, the thermodynamic consumptions at different stages are different in the actual evaporation process according to the existing equipment and temperature settings, and specific data are as follows.
The following is a thermodynamic distribution approximate table of a five-effect evaporation system for sugar production according to the embodiment of the invention:
according to the data in the heat distribution approximate calculation table, assuming that the juice steam amount is E, it can be known that the juice steam amount E1=0.88 (t) of the first-effect evaporation tank 310; the juice vapor amount E2=2.83 (t) of the second-effect evaporation tank 320; the juice vapor amount E3=5.56 (t) of the third-effect evaporation tank 330; the juice vapor amount E4=16.42 (t) of the fourth effect evaporation tank 340; the juice vapor quantity E5=2.51 (t) of the fifth effect evaporation tank 350.
Then, the material balance shows that:
total amount of evaporated water m = amount of evaporated thin juice-amount of evaporated syrup-amount of solids lost in evaporation =114.49-24.66-0.18=89.65 (t);
total consumption m' =5E of juice steam at each level 5 +4E 4 +3E 3 +2E 2 +E 1 ＝101.45(t)；
Since the total consumption of juice steam exceeds the allowable total evaporation water amount, the steam extraction scheme needs to be readjusted, if one sand is supplemented by positive steam, the extraction amount of the four-effect juice steam can be reduced, and if the supplement amount is X, the method comprises the following steps: e 4 ＝16.42-X
Namely: m' =5 × 2.51+4 × (16.42-X) +3 × 5.56+2 × 2.83+0.88 +
＝101.45-4X
The process requirement needs to meet m' = m, namely 101.45-4X =89.65, X =2.95
Thus: after adjustment, the amount of the four-effect juice vapor for pumping is 16.42-2.95=13.47 (t)
Thus, the fifth effect evaporation tank 350 evaporates water of m5=2.51 (t);
the amount of water evaporated by the fourth effect evaporation tank 340, m4= m5+ E4=2.51+13.47=15.98 (t);
the amount of water evaporated by the third effect evaporation tank 330 is m3= m4+ E3=15.98+5.56=21.54 (t);
the amount of water evaporated by the second effect evaporation tank 320 is m2= m3+ E2=21.54+2.83=24.37 (t);
the amount of water evaporated by the first effect evaporation tank 310, m1= m2+ E1=24.37+0.88=25.25 (t).
Therefore, the positive steam consumption at the evaporation section D = m1+ X =25.25+2.95=28.2 (t)
And actual measurement and calculation show that the steam can be saved by 2.0t for the self-evaporation of condensed water at each stage, the steam can be saved by 2.2t for the self-evaporation of sugar juice, and the theoretical positive steam consumption is 28.2-2.0-2.2=24 (t).
Therefore, the actual steam consumption is: theoretical gas consumption × heat loss =24 × 1.05=25.2 (t)
According to the scheme of the invention and empirical data of heat transfer of each heat-using device in actual production, the total steam consumption in the sugar-making evaporation process can be calculated to be reduced from more than 35% for vegetables (empirical data) to 25.2% for vegetables, namely, the steam consumption per hundred tons of beets is 25.2 tons, so that the heat consumption is greatly reduced, and the energy-saving effect is achieved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A five-effect evaporation system for sugar production is characterized by comprising
The heater assembly comprises a first-level dilute juice heater, a second-level dilute juice heater, a third-level dilute juice heater, a fourth-level dilute juice heater and a fifth-level dilute juice heater, wherein an inlet of the first-level dilute juice heater is connected with a sugar juice inlet pipe, an outlet of the first-level dilute juice heater is connected with an inlet of the second-level dilute juice heater, and the third-level dilute juice heater, the fourth-level dilute juice heater and the fifth-level dilute juice heater are sequentially connected;
the evaporating pot subassembly, the evaporating pot subassembly includes first effect evaporating pot, second effect evaporating pot, third effect evaporating pot, fourth effect evaporating pot, fifth effect evaporating pot and sugar juice pump, the juice pipe that advances of fourth effect evaporating pot with the exit linkage of thin juice secondary heater, the play juice pipe of fourth effect evaporating pot passes through the sugar juice pump with the tertiary heater entry linkage of thin juice, the export of thin juice fifth level heater with the juice union coupling that advances of first effect evaporating pot, second effect evaporating pot, third effect evaporating pot and the juice mouth that goes out of fifth effect evaporating pot with advance the juice pipe and connect gradually, the steam inlet and the positive steam air supply pipe of first effect evaporating pot are connected, the juice vapour export of first effect evaporating pot with the steam inlet of second effect evaporating pot with the heat source of thin juice fifth level heater is connected, a juice steam outlet of the second-effect evaporating pot is connected with a steam inlet of the third-effect evaporating pot, a heat source of the thin juice four-stage heater, a heat source of a crystallizing and washing pot and a granulated sugar drying heat source, a juice steam outlet of the third-effect evaporating pot is connected with a steam inlet of the fourth-effect evaporating pot, a heat source of the thin juice three-stage heater and a heat source of a clear juice two-stage heater, a juice steam outlet of the fourth-effect evaporating pot is connected with a steam inlet of the fifth-effect evaporating pot, a heat source of the thin juice two-stage heater, a heat source of a seeped juice two-stage blanching device, a heat source of a clear juice one-stage heater, a heat source of an ash juice four-stage heater, a heat source of an exudation device and a heat source of a crystallizing pot, and a juice steam outlet of the fifth-effect evaporating pot is connected with a heat source of an ash juice two-stage heater and a condenser;
the condensed water self-evaporation component comprises a first-effect condensed water bag, a second-effect condensed water bag, a third-effect condensed water bag, a fourth-effect condensed water bag and a fifth-effect condensed water bag, wherein the first-effect condensed water bag, the second-effect condensed water bag, the third-effect condensed water bag, the fourth-effect condensed water bag and the fifth-effect condensed water bag are respectively used for storing condensed water of the first-effect evaporation tank, the second-effect evaporation tank, the third-effect evaporation tank, the fourth-effect evaporation tank and the fifth-effect evaporation tank, the first-effect condensed water bag comprises three series-connected water bags, the condensed water discharged by the first-effect evaporation tank can sequentially pass through the three series-connected water bags, the first-level diluted juice heater and the third-level ash juice heater, and is finally used for boiler water of a power plant, the condensed water discharged by the second-effect evaporation tank can sequentially pass through the second-effect condensed water bag, the third-effect condensed water bag, the fourth-effect condensed water bag, the fifth-effect condensed water bag, the first-level diluted juice heater and the whole-plant heater, and the hot water box;
and the syrup balancing tank is used for storing the syrup flowing out from the juice outlet of the fifth-effect evaporation tank.
2. The five-effect evaporation system for sugar production according to claim 1, wherein the first-effect evaporation tank, the second-effect evaporation tank, the third-effect evaporation tank, the fourth-effect evaporation tank and the fifth-effect evaporation tank all use falling film type-effect evaporation tanks.
3. The five-effect evaporation system for making sugar according to claim 1, wherein said thin juice primary heater, said thin juice secondary heater, said thin juice tertiary heater, said thin juice quaternary heater and said thin juice five-stage heater all use plate heat exchangers.
4. Use of a five-effect evaporation system for sugar production, characterized in that the five-effect evaporation system for sugar production according to any one of claims 1 to 3 is used, and the following steps are carried out:
s1, temperature setting: setting the positive steam temperature and the juice steam outlet temperatures of the first effect evaporation tank, the second effect evaporation tank, the third effect evaporation tank, the fourth effect evaporation tank and the fifth effect evaporation tank to be 132.9 ℃, 126.7 ℃, 120.2 ℃, 113.0 ℃ and 105.0 ℃ respectively;
s2, starting all parts of the system, introducing the sugar juice which needs to be evaporated and concentrated into the dilute juice primary heater, and enabling the flow sequence of the sugar juice to be as follows: the first-level thin juice heater, the second-level thin juice heater, the fourth-effect evaporating pot, the sugar juice pump, the third-level thin juice heater, the fourth-level thin juice heater, the fifth-level thin juice heater, the first-effect evaporating pot, the second-effect evaporating pot, the third-effect evaporating pot and the fifth-effect evaporating pot;
and S3, finally, collecting the syrup obtained by the fifth effect evaporation tank in the syrup balance tank.
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