CN213285699U - Evaporation concentration device of cellulose solvent NMMO aqueous solution - Google Patents
Evaporation concentration device of cellulose solvent NMMO aqueous solution Download PDFInfo
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- CN213285699U CN213285699U CN202021957340.0U CN202021957340U CN213285699U CN 213285699 U CN213285699 U CN 213285699U CN 202021957340 U CN202021957340 U CN 202021957340U CN 213285699 U CN213285699 U CN 213285699U
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Abstract
An evaporative concentration device for a cellulose solvent NMMO aqueous solution belongs to the technical field of aqueous solution evaporative concentration devices and comprises a first-effect evaporator, a second-effect evaporator, a third-effect evaporator, a fourth-effect evaporator, a fifth-effect evaporator and a sixth-effect evaporator which are sequentially connected in series, wherein the sixth-effect evaporator is also sequentially connected with a main surface condenser and an auxiliary surface condenser; the six-effect evaporator is provided with a first evaporation chamber and a second evaporation chamber which are connected in series; the first-effect evaporator, the second-effect evaporator, the third-effect evaporator, the fourth-effect evaporator and the fifth-effect evaporator are respectively provided with a first-effect condensation water tank, a second-effect condensation water tank, a third-effect condensation water tank, a fourth-effect condensation water tank and a fifth-effect condensation water tank which are correspondingly connected with the first-effect evaporator, the second-effect evaporator, the third-effect evaporator, the fourth-effect evaporator and the. The utility model provides a multi-effect evaporator in the conventional art, its energy consumption and NMMO concentration can not satisfy the production index requirement, can't realize continuous, stable high enriched output in succession, problem that work efficiency is low.
Description
Technical Field
The utility model discloses water solution evaporative concentration device technical field, concretely relates to evaporative concentration device of cellulose solvent NMMO aqueous solution.
Background
Solvent process cellulose fiber is a new fiber production process, the solvent used is an aqueous solution of N-methylmorpholine-N-oxide (NMM 0). The high-concentration NMMO and the pulp are mixed and then enter a dissolving machine, the pulp congee is dissolved to form glue solution, the concentration of NMMO after fiber separation is 10-25%, the concentration reaches 76-86% after evaporation and concentration, and the NMMO aqueous solution is characterized by high boiling point and easy decomposition at high temperature and high concentration.
The prior art discloses a CN205391766U patent, and the process flow is characterized by 'series preheating, one-effect feeding, concurrent evaporation and concentrated-effect combined heating'. The system comprises a first-effect evaporator, a second-effect evaporator, a third-effect evaporator, a fourth-effect evaporator, a fifth-effect evaporator, a first-stage preheater, a second-stage preheater, a third-stage preheater, a fourth-stage preheater and a fifth-stage preheater, wherein the first-effect evaporator, the second-effect evaporator, the third-effect evaporator, the fourth-effect evaporator and the fifth-effect evaporator are fed by the first-.
Along with the production use of the device, the not enough of this technique has gradually been exposed, and in the multi-effect evaporator in the production line of this technique, its energy consumption and NMMO concentration can not satisfy the production index requirement, can not realize continuous, stable high enriched output, and work efficiency is low.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
SUMMERY OF THE UTILITY MODEL
To the defect among the prior art, the utility model provides an evaporative concentration device of cellulose solvent NMMO aqueous solution for solve the multi-effect evaporator in the conventional art, its energy consumption and NMMO concentration can not satisfy the production index requirement, can't realize in succession, stabilize high enriched output, problem that work efficiency is low.
In order to achieve the above object, the utility model provides a following technical scheme:
an evaporative concentration device for a cellulose solvent NMMO aqueous solution comprises a first-effect evaporator, a second-effect evaporator, a third-effect evaporator, a fourth-effect evaporator, a fifth-effect evaporator and a sixth-effect evaporator which are sequentially connected in series, wherein the sixth-effect evaporator is also sequentially connected with a main surface condenser and an auxiliary surface condenser; the six-effect evaporator is provided with a first evaporation chamber and a second evaporation chamber which are connected in series; the first-effect evaporator, the second-effect evaporator, the third-effect evaporator, the fourth-effect evaporator and the fifth-effect evaporator are respectively provided with a first-effect condensation water tank, a second-effect condensation water tank, a third-effect condensation water tank, a fourth-effect condensation water tank and a fifth-effect condensation water tank which are correspondingly connected with the first-effect evaporator, the second-effect evaporator, the third-effect evaporator, the fourth-effect evaporator and the fifth.
As an optimized scheme, the first-effect evaporator, the second-effect evaporator, the third-effect evaporator, the fourth-effect evaporator and the fifth-effect evaporator are respectively provided with a first-effect preheater, a second-effect preheater, a third-effect preheater, a fourth-effect preheater and a fifth-effect preheater which are correspondingly connected with the first-effect evaporator, the second-effect preheater, the third-effect preheater, the fourth-effect preheater and the fifth-effect evaporator, and the first-effect preheater, the second-effect preheater, the third-effect preheater, the fourth-effect preheater and the fifth.
As an optimized scheme, a concentrated solvent heat exchanger, a cleaning condensate water plate type preheater and a secondary condensate water plate type preheater are sequentially connected to the five-effect preheater, and the secondary condensate water plate type preheater is further connected with the auxiliary surface condenser.
One imitate the condensate water pitcher and still connect through clean condensate pipe the board-like preheater of clean condensate water, and be equipped with clean condensate water pump on the clean condensate water pipeline.
As an optimized scheme, the inlet of the primary effect condensed water tank is communicated with a low-pressure steam pipeline and is converged to the primary effect evaporator.
As an optimized scheme, a steam outlet of the two-effect condensed water tank is connected with the three-effect evaporator.
As an optimized scheme, a steam outlet of the three-effect condensed water tank is connected with the four-effect evaporator.
As an optimized scheme, the second evaporation chamber is further connected with the four-effect condensed water tank, and a steam outlet of the four-effect condensed water tank is connected with the five-effect evaporator.
As an optimized scheme, a steam outlet of the five-effect condensed water tank is connected with the six-effect evaporator.
As an optimized scheme, the condensed water of the first evaporation chamber, the main surface condenser and the auxiliary surface condenser and the condensed water of the five-effect condensed water tank are connected with the secondary condensed water plate type preheater through a secondary condensing pipeline, and the secondary condensing pipeline is further connected with a secondary condensed water pump.
As an optimized scheme, a vacuum pump is further connected to the secondary surface condenser.
As an optimized scheme, the two-effect condensed water tank, the three-effect condensed water tank, the four-effect condensed water tank and the five-effect condensed water tank are sequentially connected.
As an optimized scheme, secondary steam of the second-effect evaporator and secondary steam of the third-effect evaporator are connected with the second evaporation chamber through a secondary steam pipeline, and a valve is arranged on the secondary steam pipeline.
As an optimized scheme, the first-effect evaporator, the second-effect evaporator, the third-effect evaporator, the fourth-effect evaporator, the fifth-effect evaporator and the sixth-effect evaporator are respectively and correspondingly provided with a circulating pump with each effect.
As an optimized scheme, a dilute solvent pipeline is connected to the secondary surface condenser.
As an optimized proposal, a concentrated solvent pipeline is connected to the second evaporation chamber.
Compared with the prior art, the beneficial effects of the utility model are that:
according to the characteristics of high-concentration high-temperature easy decomposition, low-temperature easy solidification crystallization, small effective heat transfer temperature difference, high boiling point and the like of the material, the material circulation flow is provided with high-temperature low-concentration high-concentration and low-temperature high-concentration, and high-concentration effect is high-vacuum negative pressure effect, the influence caused by high-concentration high boiling point is overcome in a high vacuum state, the equipment structure adopts an integrated split-flow design, two groups of heating elements share one shell, two different parts are divided into two independent circulating film distribution systems, the purpose of producing two concentration gradient materials by one shell is realized, two secondary steams enter a heating element plate group on a heating heat source, the requirement of high-concentration 85% temperature of 96-99 ℃ can be met, and high-concentration low-temperature solidified crystallization is avoided; the operation is convenient, the labor force is reduced, and the working efficiency is improved; the stability in the working process is ensured; saving working time, simple structure and convenient use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1-one-effect evaporator, 2-two-effect evaporator, 3-three-effect evaporator, 4-four-effect evaporator, 5-five-effect evaporator, 6-six-effect evaporator, 7-main surface condenser, 8-auxiliary surface condenser, 9-vacuum pump, 10-one-effect condensate water tank, 11-two-effect condensate water tank, 12-three-effect condensate water tank, 13-four-effect condensate water tank, 14-five-effect condensate water tank, 15-one-effect preheater, 16-two-effect preheater, 17-three-effect preheater, 18-four-effect preheater, 19-five-effect preheater, 20-concentrated solvent heat exchanger, 21-clean condensate water plate preheater, 22-secondary condensate water plate preheater, 23-clean condensate water pump, 24-each-effect circulating pump, 25-a concentrated solution pump and 26-a secondary condensate pump.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the evaporation concentration device of the cellulose solvent NMMO aqueous solution comprises a first-effect evaporator 1, a second-effect evaporator 2, a third-effect evaporator 3, a fourth-effect evaporator 4, a fifth-effect evaporator 5 and a sixth-effect evaporator 6 which are sequentially connected in series, wherein the sixth-effect evaporator 6 is further sequentially connected with a main surface condenser 7 and an auxiliary surface condenser 8;
the six-effect evaporator 6 is provided with a first evaporation chamber and a second evaporation chamber which are connected in series;
the first-effect evaporator 1, the second-effect evaporator 2, the third-effect evaporator 3, the fourth-effect evaporator 4 and the fifth-effect evaporator 5 are respectively provided with a first-effect condensation water tank 10, a second-effect condensation water tank 11, a third-effect condensation water tank 12, a fourth-effect condensation water tank 13 and a fifth-effect condensation water tank 14 which are correspondingly connected with the first-effect evaporator, the second-effect evaporator, the third-effect evaporator and the fifth-effect evaporator;
the first-effect evaporator 1, the second-effect evaporator 2, the third-effect evaporator 3, the fourth-effect evaporator 4 and the fifth-effect evaporator 5 are respectively provided with a first-effect preheater 15, a second-effect preheater 16, a third-effect preheater 17, a fourth-effect preheater 18 and a fifth-effect preheater 19 which are correspondingly connected with the first-effect evaporator, the second-effect preheater 16, the third-effect preheater 17, the fourth-effect preheater 18 and the fifth-effect preheater 19 which are sequentially connected.
The five-effect preheater 19 is sequentially connected with a concentrated solvent heat exchanger 20, a cleaning condensate plate preheater 21 and a secondary condensate plate preheater 22, and the secondary condensate plate preheater 22 is also connected with the secondary surface condenser 8.
The first-effect condensed water tank 10 is also connected with a clean condensed water plate type preheater 21 through a clean condensed water pipeline, and a clean condensed water pump 23 is arranged on the clean condensed water pipeline.
The inlet of the one-effect condensed water tank 10 is communicated with the low-pressure steam pipeline and is converged to the one-effect evaporator 1.
The steam outlet of the two-effect condensed water tank 11 is connected with the three-effect evaporator 3.
The steam outlet of the three-effect condensed water tank 12 is connected with the four-effect evaporator 4.
The second evaporation chamber is also connected with a four-effect condensed water tank 13, and a steam outlet of the four-effect condensed water tank 13 is connected with the five-effect evaporator 5.
The steam outlet of the five-effect condensed water tank 14 is connected with the six-effect evaporator 6.
The condensed water of the first evaporation chamber, the main surface condenser 7 and the auxiliary surface condenser 8 and the condensed water of the five-effect condensed water tank 14 are connected with a secondary condensed water plate type preheater 22 through a secondary condensed pipeline, and the secondary condensed pipeline is also connected with a secondary condensed water pump 26.
The secondary surface condenser 8 is also connected to a vacuum pump 9.
The two-effect condensed water tank 11, the three-effect condensed water tank 12, the four-effect condensed water tank 13 and the five-effect condensed water tank 14 are connected in sequence.
The secondary steam of the second-effect evaporator 2 and the secondary steam of the third-effect evaporator 3 are connected with a second evaporation chamber through a secondary steam pipeline, and a valve is arranged on the secondary steam pipeline.
The first-effect evaporator 1, the second-effect evaporator 2, the third-effect evaporator 3, the fourth-effect evaporator 4, the fifth-effect evaporator 5 and the sixth-effect evaporator 6 are respectively and correspondingly provided with a circulating pump 24.
The secondary surface condenser 8 is connected with a dilute solvent pipeline.
The second evaporation chamber is connected with a concentrated solvent pipeline.
A concentrated solution outlet pump 25 is arranged on the concentrated solution pipeline.
The device integrally comprises a countercurrent preheating system, a concurrent evaporation system, a condensed water collecting system and a vacuum system.
The countercurrent preheating system adopts nine-stage preheating and is sequentially connected with the auxiliary surface condenser 8, the secondary condensed water plate preheater 22, the cleaning condensed water plate preheater 21, the concentrated solvent heat exchanger 20, the five-effect preheater 19, the four-effect preheater 18, the three-effect preheater 17, the two-effect preheater 16 and the one-effect preheater 15 in series;
the downstream evaporation system comprises a first evaporation chamber and a second evaporation chamber of a first-effect evaporator 1, a second-effect evaporator 2, a third-effect evaporator 3, a fourth-effect evaporator 4, a fifth-effect evaporator 5 and a sixth-effect evaporator 6 which are sequentially connected in series; each effect evaporator 1 comprises a circulating pump and a corresponding connecting pipeline;
wherein, the six-effect evaporator 6 is divided into a first evaporation chamber and a second evaporation chamber by adopting an integrated split-range design, adopts two circulating pumps to realize the circulation of the solvent and is provided with corresponding pipelines to be connected with the evaporator.
The low-pressure fresh steam is used for the first-effect evaporator 1, and an independent steam temperature reduction system and related regulating valves are configured to realize steam input control;
the secondary steam generated by the former effect is used by other effects (except the effect of the second evaporation chamber), and the final secondary steam enters a surface condenser (a main condenser and an auxiliary condenser) for condensation and is not condensed and pumped out by a vacuum pump 9. Under normal conditions, the heat source of the second evaporation chamber is secondary steam from the second effect and the third effect; is connected with the evaporator through a corresponding secondary steam pipeline and a valve.
The condensed water collecting system adopts a sewage and sewage diversion design, is provided with a recovery loop and is connected with the pump by using a related pipeline; the sensible heat recovery and the preheating of the dilute solvent are maximized, and the specific description is as follows:
the condensate tank is a condensate flash tank.
The condensate water discharged in the first effect is new steam condensate water which is used as the third-stage preheating of the dilute solvent;
condensed water of the second-effect evaporator 2 is collected from the bottom of the plate and enters the second-effect condensed water flash tank for flash evaporation, the flash evaporation steam is supplemented to the third-effect evaporator to be used as a heat source,
the condensed water and the triple-effect condensed water are merged and enter a triple-effect condensed water flash tank, the flash steam is supplemented to the four effects as a heat source,
the condensed water, the four-effect condensed water and the second evaporation chamber effect condensed water are combined and enter a four-effect condensed water flash tank, the flash steam is supplemented to five effects to be used as a heat source,
the condensed water and the five-effect condensed water are merged and enter a five-effect condensed water flash tank, the flash steam is supplemented to VI effect as a heat source,
the condensed water of the first evaporation chamber, the main condenser and the auxiliary condenser is also merged to an outlet of the five-effect condensed water flash tank and then is sent out by a secondary condensed water pump 26 to be used as a second-stage preheating of the dilute solvent; the condensed water of each effect of the evaporator 1 is connected with the condensed water tank through a related pipeline.
The first evaporation chamber/second evaporation chamber effect secondary steam enters the main surface condenser 7 and the auxiliary surface condenser 8 in sequence for condensation, vacuum is formed under the auxiliary action of the vacuum pump 9, wherein a gas phase outlet of the main surface condenser 7 is connected with a gas phase inlet of the auxiliary surface condenser 8, and the auxiliary surface condenser 8 is connected with the vacuum pump 9 group to pump out non-condensable gas.
The material (dilute solvent) sequentially passes through the secondary surface condenser 8, the secondary condensed water plate preheater 22, the cleaning condensed water plate preheater 21, the concentrated solvent heat exchanger 20, the five-effect preheater 19, the four-effect preheater 18, the three-effect preheater 17, the two-effect preheater 16 and the one-effect preheater 15 and enters the one-effect evaporator 1;
the concurrent flow evaporation system comprises one-effect evaporators 1 which are sequentially connected in series. The preheater adopts fixed tube sheet formula structure, and whole material adopts nine grades to preheat, make full use of steam latent heat and discharge comdenstion water sensible heat, and the material reaches and is close boiling point temperature after preheating and gets into one effect evaporimeter 1, gets into next effect according to the following current mode in proper order and carries out evaporative concentration.
An outlet of the effective discharging pump of the second evaporation chamber is provided with an online refractometer for detecting the discharging concentration.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.
Claims (10)
1. An evaporation concentration device of cellulose solvent NMMO aqueous solution which characterized in that: the evaporator comprises a first-effect evaporator (1), a second-effect evaporator (2), a third-effect evaporator (3), a fourth-effect evaporator (4), a fifth-effect evaporator (5) and a sixth-effect evaporator (6) which are sequentially connected in series, wherein the sixth-effect evaporator (6) is also sequentially connected with a main surface condenser (7) and an auxiliary surface condenser (8); the six-effect evaporator (6) is provided with a first evaporation chamber and a second evaporation chamber which are connected in series; the first-effect evaporator (1), the second-effect evaporator (2), the third-effect evaporator (3), the fourth-effect evaporator (4) and the fifth-effect evaporator (5) are respectively provided with a first-effect condensation water tank (10), a second-effect condensation water tank (11), a third-effect condensation water tank (12), a fourth-effect condensation water tank (13) and a fifth-effect condensation water tank (14) which are correspondingly connected with the first-effect evaporator.
2. The apparatus according to claim 1, wherein the apparatus for evaporative concentration of an aqueous solution of cellulose solvent NMMO comprises: the single-effect evaporator (1), the double-effect evaporator (2), the triple-effect evaporator (3), the triple-effect evaporator (4) and the five-effect evaporator (5) are respectively provided with a single-effect preheater (15), a double-effect preheater (16), a triple-effect preheater (17), a quadruple-effect preheater (18) and a five-effect preheater (19) which are correspondingly connected with the single-effect evaporator, and the single-effect preheater (15), the double-effect preheater (16), the triple-effect preheater (17), the quadruple-effect preheater (18) and the five-effect preheater (19) are sequentially connected.
3. The apparatus according to claim 2, characterized in that: five-effect preheater (19) are gone up and are connected gradually rich solvent heat exchanger (20), clean comdenstion water plate preheater (21) and secondary comdenstion water plate preheater (22), secondary comdenstion water plate preheater (22) still with vice surface condenser (8) are connected, still be connected with vacuum pump (9) on vice surface condenser (8).
4. An apparatus according to claim 3 for the evaporative concentration of an aqueous solution of cellulose solvent NMMO, wherein: one imitate condensate water pitcher (10) still connect through clean condensate pipe clean condensate water plate preheater (21), and be equipped with clean condensate water pump (23) on the clean condensate water pipeline, the entry and the low pressure steam pipeline of one imitate condensate water pitcher (10) are linked together to converge extremely on one effect evaporimeter (1).
5. The apparatus according to claim 1, wherein the apparatus for evaporative concentration of an aqueous solution of cellulose solvent NMMO comprises: and a steam outlet of the two-effect condensed water tank (11) is connected with the three-effect evaporator (3).
6. The apparatus according to claim 1, wherein the apparatus for evaporative concentration of an aqueous solution of cellulose solvent NMMO comprises: and a steam outlet of the three-effect condensed water tank (12) is connected with the four-effect evaporator (4).
7. The apparatus according to claim 1, wherein the apparatus for evaporative concentration of an aqueous solution of cellulose solvent NMMO comprises: the second evaporation chamber is also connected with a four-effect condensed water tank (13), and a steam outlet of the four-effect condensed water tank (13) is connected with the five-effect evaporator (5).
8. The apparatus according to claim 1, wherein the apparatus for evaporative concentration of an aqueous solution of cellulose solvent NMMO comprises: and a steam outlet of the five-effect condensed water tank (14) is connected with the six-effect evaporator (6).
9. An apparatus according to claim 3 for the evaporative concentration of an aqueous solution of cellulose solvent NMMO, wherein: the condensed water of the first evaporation chamber, the main surface condenser (7) and the auxiliary surface condenser (8) and the condensed water of the five-effect condensed water tank (14) are connected with the secondary condensed water plate type preheater (22) through a secondary condensing pipeline, and the secondary condensing pipeline is further connected with a secondary condensed water pump (26).
10. The apparatus according to claim 1, wherein the apparatus for evaporative concentration of an aqueous solution of cellulose solvent NMMO comprises: and the secondary steam of the second-effect evaporator (2) and the secondary steam of the third-effect evaporator (3) are connected with the second evaporation chamber through a secondary steam pipeline, and a valve is arranged on the secondary steam pipeline.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021957340.0U CN213285699U (en) | 2020-09-09 | 2020-09-09 | Evaporation concentration device of cellulose solvent NMMO aqueous solution |
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| CN202021957340.0U CN213285699U (en) | 2020-09-09 | 2020-09-09 | Evaporation concentration device of cellulose solvent NMMO aqueous solution |
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