阅读说明：本技术 一种用于处理硝酸锂废水的多效蒸发器 (Multi-effect evaporator for treating lithium nitrate wastewater ) 是由 宋春林 陈培 于 2021-05-27 设计创作，主要内容包括：本发明公开了一种用于处理硝酸锂废水的多效蒸发器,包括多效降膜蒸发系统和两效强制循环蒸发系统,多效降膜蒸发系统包括第一进料泵和多个相连通的降膜蒸发组件,两效强制循环蒸发系统包括物料中转罐、第二进料泵、一效加热器、一效分离器、一效强制循环泵、二效加热器、二效分离器和二效强制循环泵。本发明提供的技术方案中,物料经多效降膜蒸发系统蒸发浓缩后,变得较粘稠的物料进入二效强制循环蒸发系统,物料经二效分离器内后进入二效强制循环加热器蒸发,不断浓缩,再经一效分离器内后进入一效强制循环加热器,物料达到要求浓度蒸发结束。(The invention discloses a multi-effect evaporator for treating lithium nitrate wastewater, which comprises a multi-effect falling film evaporation system and a two-effect forced circulation evaporation system, wherein the multi-effect falling film evaporation system comprises a first feeding pump and a plurality of falling film evaporation assemblies which are communicated, and the two-effect forced circulation evaporation system comprises a material transfer tank, a second feeding pump, a first-effect heater, a first-effect separator, a first-effect forced circulation pump, a second-effect heater, a second-effect separator and a second-effect forced circulation pump. According to the technical scheme provided by the invention, after the materials are evaporated and concentrated by a multi-effect falling film evaporation system, the materials which are changed into thicker materials enter a two-effect forced circulation evaporation system, the materials enter a two-effect forced circulation heater for evaporation after passing through a two-effect separator, are continuously concentrated, enter a one-effect forced circulation heater after passing through a one-effect separator, and the evaporation of the materials reaching the required concentration is finished.)

1. A multi-effect evaporator for treating lithium nitrate wastewater is characterized by comprising a multi-effect falling film evaporation system and a two-effect forced circulation evaporation system, wherein the multi-effect falling film evaporation system comprises a first feeding pump and a plurality of communicated falling film evaporation components, and the two-effect forced circulation evaporation system comprises a material transfer tank, a second feeding pump, a first-effect heater, a first-effect separator, a first-effect forced circulation pump, a second-effect heater, a second-effect separator and a second-effect forced circulation pump;

the material inlet and the material outlet of the first feeding pump are respectively communicated with the material outlet of a raw material tank and the material inlet of the uppermost stream of the falling film evaporation assemblies, the steam inlet of the uppermost stream of the falling film evaporation assemblies is communicated with the raw steam inlet of a steam pipeline, and the material outlet of the lowermost stream of the falling film evaporation assemblies is communicated with the material inlet of the material transfer tank;

the material inlet and the material outlet of the second feeding pump are respectively communicated with the material outlet of the material transfer tank and the material inlet of the two-effect separator, the material inlet, the material outlet and the tap water inlet of the two-effect separator are respectively communicated with the material outlet of the two-effect heater, the material inlet of the two-effect forced circulation pump and the tap water inlet of the tap water pipeline, and the secondary steam inlet, the non-condensable gas inlet and the material inlet of the two-effect heater are respectively communicated with the secondary steam inlet and the secondary steam outlet of the one-effect separator, the non-condensable gas outlet of the one-effect heater and the material outlet of the two-effect forced circulation pump;

the material inlet and the material outlet of the first-effect separator are respectively communicated with the material outlet of the first-effect heater and the material inlet of the first-effect forced circulation pump, and the steam inlet and the material inlet of the first-effect heater are respectively communicated with the raw steam inlet of the steam pipeline and the material outlet of the first-effect forced circulation pump.

2. The multi-effect evaporator for treating lithium nitrate wastewater of claim 1 wherein the plurality of falling film evaporation components comprises a single-effect falling film heater, a single-effect falling film separator, a single-effect falling film circulating pump, a double-effect falling film heater, a double-effect falling film separator, a double-effect falling film circulating pump, a triple-effect falling film heater, a triple-effect falling film separator and a triple-effect falling film circulating pump;

a first material inlet, a steam inlet, a secondary steam outlet, a second material inlet, a material outlet and a non-condensable gas outlet of the first-effect falling film heater are respectively communicated with a material outlet of the first-effect falling film circulating pump, a raw steam inlet of the steam pipeline, a secondary steam inlet and a material outlet of the first-effect falling film separator, a material inlet of the first-effect falling film circulating pump and a non-condensable gas inlet of the second-effect falling film heater;

a material first inlet, a secondary steam inlet, a material second inlet, a secondary steam outlet, a material third inlet, a material outlet, a non-condensable gas outlet and a condensed water outlet of the double-effect falling film heater are respectively communicated with a material outlet of the double-effect falling film circulating pump, a secondary steam outlet of the first-effect falling film separator, a material outlet of the first-effect falling film circulating pump, a secondary steam inlet and a material outlet of the double-effect falling film separator, a material inlet of the double-effect falling film circulating pump, a non-condensable gas inlet and a condensed water inlet of the double-effect falling film heater;

a first material inlet, a second steam inlet, a second material inlet, a second steam outlet, a third material inlet and a material outlet of the triple-effect falling film heater are respectively communicated with a material outlet of the triple-effect falling film circulating pump, a second steam outlet of the double-effect falling film separator, a material outlet of the double-effect falling film circulating pump, a second steam inlet and a material outlet of the triple-effect falling film separator and a material inlet of the triple-effect falling film circulating pump;

and a material outlet of the triple-effect falling film circulating pump is communicated with a material inlet of the material transfer tank.

3. The multi-effect evaporator for treating lithium nitrate wastewater of claim 2, wherein the multi-effect falling film evaporation system further comprises a first raw steam condensate water tank, a first raw steam condensate water pump, and a preheater;

the non-condensable gas outlet, the first condensed water inlet, the second condensed water inlet and the condensed water outlet of the first raw steam condensed water tank are respectively communicated with the non-condensable gas inlet of the first effect falling film heater, the condensed water outlet of the first raw steam condensed water pump, the condensed water outlet of the preheater and the condensed water inlet of the first raw steam condensed water pump;

the material outlet, the condensed water inlet and the material inlet of the preheater are respectively communicated with the material three-inlet, the condensed water outlet and the material outlet of the first feed pump of the single-effect falling film heater;

and a condensate water outlet of the first raw steam condensate water pump is communicated with a condensate water inlet of a third raw steam condensate water tank.

4. The multi-effect evaporator for treating lithium nitrate wastewater of claim 2, wherein the multi-effect evaporator for treating lithium nitrate wastewater further comprises a first condenser and a second condenser;

a secondary steam inlet, a non-condensable gas inlet and a condensed water inlet of the first condenser are respectively communicated with a secondary steam outlet of the triple-effect falling film separator, a non-condensable gas outlet of the triple-effect falling film heater and a condensed water outlet;

the secondary steam inlet, the non-condensable gas inlet and the condensed water inlet of the second condenser are respectively communicated with the secondary steam outlet of the secondary effect separator, the non-condensable gas outlet and the condensed water outlet of the secondary effect heater, and the non-condensable gas inlet of the secondary effect heater is communicated with the non-condensable gas outlet of the primary effect heater.

5. The multi-effect evaporator for treating lithium nitrate wastewater of claim 4, wherein the multi-effect falling film evaporation system further comprises a first negative pressure pump of condensed water, a second negative pressure pump of condensed water, and an evaporation condensed water tank;

a condensate water inlet and a condensate water outlet of the first condensate water negative pressure pump are respectively communicated with a condensate water outlet of the first condenser and a condensate water inlet of the evaporation condensate water tank;

and a condensate water inlet and a condensate water outlet of the second condensate water negative pressure pump are respectively communicated with a condensate water outlet of the second condenser and a condensate water second inlet of the evaporation condensate water tank.

6. The multi-effect evaporator for treating lithium nitrate wastewater of claim 2, wherein the multi-effect falling film evaporation system further comprises a first emergency tank, and a material inlet of the first emergency tank is communicated with a material outlet of the raw material tank, a material outlet of the first effect falling film heater, a material outlet of the second effect falling film heater and a material outlet of the third effect falling film heater.

7. The multi-effect evaporator for treating lithium nitrate wastewater as recited in claim 2, wherein the multi-effect falling film evaporation system further comprises a first measuring tank, and a material inlet and a material outlet of the first measuring tank are respectively communicated with a material outlet and a material inlet of the three-effect falling film circulating pump.

8. The multi-effect evaporator for treating lithium nitrate wastewater of claim 1, wherein the two-effect forced circulation evaporation system further comprises a second raw steam condensate tank and a second raw steam condensate pump;

the non-condensable gas outlet, the first condensed water inlet, the second condensed water inlet and the condensed water outlet of the second raw steam condensed water tank are respectively communicated with the non-condensable gas inlet of the first effect heater, the condensed water outlet of the second raw steam condensed water pump, the condensed water outlet of the first effect heater and the condensed water inlet of the second raw steam condensed water pump;

and a condensate water outlet of the second raw steam condensate water pump is communicated with a condensate water second inlet of the third raw steam condensate water tank.

9. The multi-effect evaporator for treating lithium nitrate wastewater as recited in claim 1, wherein the two-effect forced circulation evaporation system further comprises a discharge concentration pump, a second measurement tank, a third measurement tank and a concentrate buffer tank;

the material inlet and the material outlet of the second measuring tank are respectively communicated with the material outlet and the material inlet of the first-effect forced circulation pump;

a first material inlet, a second material inlet, a third material inlet and a material outlet of the concentrated solution cache tank are respectively communicated with a material outlet of the third measuring tank, a material outlet of the discharge concentration pump, a material outlet of the first-effect forced circulation pump and a material inlet of the discharge concentration pump;

and a material inlet of the third measuring tank is communicated with a material outlet of the discharging concentration pump.

10. The multi-effect evaporator for treating lithium nitrate wastewater of claim 9, wherein the two-effect forced circulation evaporation system further comprises a second emergency tank, and a material inlet of the second emergency tank is communicated with a material outlet of the two-effect separator, a material outlet of the first effect separator, a material outlet of the second measurement tank, a material outlet of the two-effect forced circulation pump, a material outlet of the concentrated solution buffer tank and a material outlet of the material transfer tank.

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a multi-effect evaporator for treating lithium nitrate wastewater.

Background

In industrial production, in order to enhance the recycling of industrial water, improve the water use efficiency, prevent industrial pollution and the like, the treatment of salt-containing wastewater, such as lithium nitrate wastewater solution, is often encountered. In the process of treating the lithium nitrate wastewater solution, the concentration treatment of the lithium nitrate wastewater solution is required to reduce the cost of subsequent crystallization, salt separation or storage, so that the design of a system capable of performing the concentration treatment of the lithium nitrate wastewater solution is an urgent problem to be solved.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the multi-effect evaporator for treating the lithium nitrate wastewater, which can be used for treating the lithium nitrate wastewater solution.

The invention provides a multi-effect evaporator for treating lithium nitrate wastewater, which comprises a multi-effect falling film evaporation system and a two-effect forced circulation evaporation system, wherein the multi-effect falling film evaporation system comprises a first feeding pump and a plurality of communicated falling film evaporation components, and the two-effect forced circulation evaporation system comprises a material transfer tank, a second feeding pump, a first-effect heater, a first-effect separator, a first-effect forced circulation pump, a second-effect heater, a second-effect separator and a second-effect forced circulation pump;

the material inlet and the material outlet of the first feeding pump are respectively communicated with the material outlet of a raw material tank and the material inlet of the uppermost stream of the falling film evaporation assemblies, the steam inlet of the uppermost stream of the falling film evaporation assemblies is communicated with the raw steam inlet of a steam pipeline, and the material outlet of the lowermost stream of the falling film evaporation assemblies is communicated with the material inlet of the material transfer tank;

the material inlet and the material outlet of the second feeding pump are respectively communicated with the material outlet of the material transfer tank and the material inlet of the two-effect separator, the material inlet, the material outlet and the tap water inlet of the two-effect separator are respectively communicated with the material outlet of the two-effect heater, the material inlet of the two-effect forced circulation pump and the tap water inlet of the tap water pipeline, and the secondary steam inlet, the non-condensable gas inlet and the material inlet of the two-effect heater are respectively communicated with the secondary steam inlet and the secondary steam outlet of the one-effect separator, the non-condensable gas outlet of the one-effect heater and the material outlet of the two-effect forced circulation pump;

the material inlet and the material outlet of the first-effect separator are respectively communicated with the material outlet of the first-effect heater and the material inlet of the first-effect forced circulation pump, and the steam inlet and the material inlet of the first-effect heater are respectively communicated with the raw steam inlet of the steam pipeline and the material outlet of the first-effect forced circulation pump.

Optionally, the plurality of falling film evaporation assemblies comprise a first-effect falling film heater, a first-effect falling film separator, a first-effect falling film circulating pump, a second-effect falling film heater, a second-effect falling film separator, a second-effect falling film circulating pump, a third-effect falling film heater, a third-effect falling film separator and a third-effect falling film circulating pump;

a first material inlet, a steam inlet, a secondary steam outlet, a second material inlet, a material outlet and a non-condensable gas outlet of the first-effect falling film heater are respectively communicated with a material outlet of the first-effect falling film circulating pump, a raw steam inlet of the steam pipeline, a secondary steam inlet and a material outlet of the first-effect falling film separator, a material inlet of the first-effect falling film circulating pump and a non-condensable gas inlet of the second-effect falling film heater;

a material first inlet, a secondary steam inlet, a material second inlet, a secondary steam outlet, a material third inlet, a material outlet, a non-condensable gas outlet and a condensed water outlet of the double-effect falling film heater are respectively communicated with a material outlet of the double-effect falling film circulating pump, a secondary steam outlet of the first-effect falling film separator, a material outlet of the first-effect falling film circulating pump, a secondary steam inlet and a material outlet of the double-effect falling film separator, a material inlet of the double-effect falling film circulating pump, a non-condensable gas inlet and a condensed water inlet of the double-effect falling film heater;

a first material inlet, a second steam inlet, a second material inlet, a second steam outlet, a third material inlet and a material outlet of the triple-effect falling film heater are respectively communicated with a material outlet of the triple-effect falling film circulating pump, a second steam outlet of the double-effect falling film separator, a material outlet of the double-effect falling film circulating pump, a second steam inlet and a material outlet of the triple-effect falling film separator and a material inlet of the triple-effect falling film circulating pump;

and a material outlet of the triple-effect falling film circulating pump is communicated with a material inlet of the material transfer tank.

Optionally, the multi-effect falling film evaporation system further comprises a first raw steam condensate water tank, a first raw steam condensate water pump and a preheater;

the non-condensable gas outlet, the first condensed water inlet, the second condensed water inlet and the condensed water outlet of the first raw steam condensed water tank are respectively communicated with the non-condensable gas inlet of the first effect falling film heater, the condensed water outlet of the first raw steam condensed water pump, the condensed water outlet of the preheater and the condensed water inlet of the first raw steam condensed water pump;

the material outlet, the condensed water inlet and the material inlet of the preheater are respectively communicated with the material three-inlet, the condensed water outlet and the material outlet of the first feed pump of the single-effect falling film heater;

and a condensate water outlet of the first raw steam condensate water pump is communicated with a condensate water inlet of a third raw steam condensate water tank.

Optionally, the multi-effect evaporator for treating lithium nitrate wastewater further comprises a first condenser and a second condenser;

a secondary steam inlet, a non-condensable gas inlet and a condensed water inlet of the first condenser are respectively communicated with a secondary steam outlet of the triple-effect falling film separator, a non-condensable gas outlet of the triple-effect falling film heater and a condensed water outlet;

the secondary steam inlet, the non-condensable gas inlet and the condensed water inlet of the second condenser are respectively communicated with the secondary steam outlet of the secondary effect separator, the non-condensable gas outlet and the condensed water outlet of the secondary effect heater, and the non-condensable gas inlet of the secondary effect heater is communicated with the non-condensable gas outlet of the primary effect heater.

Optionally, the multi-effect falling film evaporation system further comprises a first condensate negative pressure pump, a second condensate negative pressure pump and an evaporation condensate water tank;

a condensate water inlet and a condensate water outlet of the first condensate water negative pressure pump are respectively communicated with a condensate water outlet of the first condenser and a condensate water inlet of the evaporation condensate water tank;

and a condensate water inlet and a condensate water outlet of the second condensate water negative pressure pump are respectively communicated with a condensate water outlet of the second condenser and a condensate water second inlet of the evaporation condensate water tank.

Optionally, multiple effect falling film evaporation system still includes first emergent jar, the material import intercommunication of first emergent jar the material outlet of head tank, the material outlet of first effect falling film heater, the material outlet of second effect falling film heater, the material outlet of third effect falling film heater.

Optionally, the multiple-effect falling film evaporation system further comprises a first measuring tank, and a material inlet and a material outlet of the first measuring tank are respectively communicated with a material outlet and a material inlet of the triple-effect falling film circulating pump.

Optionally, the two-effect forced circulation evaporation system further comprises a second raw steam condensate water tank and a second raw steam condensate water pump;

the non-condensable gas outlet, the first condensed water inlet, the second condensed water inlet and the condensed water outlet of the second raw steam condensed water tank are respectively communicated with the non-condensable gas inlet of the first effect heater, the condensed water outlet of the second raw steam condensed water pump, the condensed water outlet of the first effect heater and the condensed water inlet of the second raw steam condensed water pump;

and a condensate water outlet of the second raw steam condensate water pump is communicated with a condensate water second inlet of the third raw steam condensate water tank.

Optionally, the dual-effect forced circulation evaporation system further comprises a discharge concentration pump, a second measurement tank, a third measurement tank and a concentrated solution cache tank;

the material inlet and the material outlet of the second measuring tank are respectively communicated with the material outlet and the material inlet of the first-effect forced circulation pump;

a first material inlet, a second material inlet, a third material inlet and a material outlet of the concentrated solution cache tank are respectively communicated with a material outlet of the third measuring tank, a material outlet of the discharge concentration pump, a material outlet of the first-effect forced circulation pump and a material inlet of the discharge concentration pump;

and a material inlet of the third measuring tank is communicated with a material outlet of the discharging concentration pump.

Optionally, the two-effect forced circulation evaporation system further comprises a second emergency tank, wherein a material inlet of the second emergency tank is communicated with a material outlet of the two-effect separator, a material outlet of the first-effect separator, a material outlet of the second measurement tank, a material outlet of the two-effect forced circulation pump, a material outlet of the concentrated solution buffer tank and a material outlet of the material transfer tank.

According to the technical scheme provided by the invention, a wastewater material enters a multi-effect falling film evaporation system through a first feeding pump, and when the liquid level of an evaporator reaches a set liquid level, a circulating pump is started and feeding is stopped; the first-effect falling film heater is heated to set temperature and pressure by raw steam, the material enters the first-effect falling film separator for solvent evaporation after passing through the first-effect falling film heater, secondary steam of the first-effect falling film heater exchanges heat with a second-effect material to evaporate a solvent of the second-effect material, the material enters the second-effect falling film separator for solvent evaporation after passing through the second-effect falling film heater, the concentration is continuous, the material enters the third-effect falling film separator for solvent evaporation after passing through the third-effect falling film heater, the material is viscous at the moment and enters the second-effect forced circulation evaporation system, the material enters the second-effect forced circulation heater for evaporation after passing through the second-effect separator, the concentration is continuous, the material enters the first-effect forced circulation heater after passing through the first-effect separator, and the evaporation of the material reaches the required concentration; and discharging the concentrated solution to the next procedure after the concentrated solution reaches the evaporation concentration.

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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a multi-effect falling film evaporation system in a multi-effect evaporator for treating lithium nitrate wastewater, wherein RW is a material pipeline, LS is a steam pipeline, PG is a secondary steam pipeline, CL is a condensate pipeline, VT is a non-condensable gas pipeline, CR is a cooling water pipeline, and DRW is a tap water pipeline;

fig. 2 is a schematic structural diagram of a dual-effect forced circulation evaporation system matched with the multi-effect falling film evaporation system in fig. 1.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a multi-effect evaporator for treating lithium nitrate wastewater, which can be used for concentrating a lithium nitrate solution with the mass fraction of 10% into a lithium nitrate solution with the mass fraction of 60%.

Specifically, as shown in fig. 1 and 2, in the present embodiment, the multi-effect evaporator for treating lithium nitrate wastewater includes a multi-effect falling film evaporation system and a two-effect forced circulation evaporation system, the multi-effect falling film evaporation system includes a first feed pump P01/P02 and a plurality of communicated falling film evaporation components, the two-effect forced circulation evaporation system includes a material transferring tank T07, a second feed pump P15/P16, a first-effect heater E06, a first-effect separator T08, a first-effect forced circulation pump P17, a second-effect heater E07, a second-effect separator T09 and a second-effect forced circulation pump P18; a material inlet and a material outlet of the first feed pump P01/P02 are respectively communicated with a material outlet of the raw material tank T00 and a material inlet of the uppermost stream of the falling film evaporation assemblies, a steam inlet of the uppermost stream of the falling film evaporation assemblies is communicated with a raw steam inlet of the steam pipeline LS, and a material outlet of the lowermost stream of the falling film evaporation assemblies is communicated with a material inlet of the material transfer tank T07; a material inlet and a material outlet of a second feed pump P15/P16 are respectively communicated with a material outlet of a material transfer tank T07 and a material inlet of a double-effect separator T09, a material inlet, a material outlet and a tap water inlet of the double-effect separator T09 are respectively communicated with a material outlet of a double-effect heater E07, a material inlet of a double-effect forced circulation pump P18 and a tap water inlet of a tap water pipeline DRW, and a secondary steam inlet, a non-condensable gas inlet and a material inlet of the double-effect heater E07 are respectively communicated with a secondary steam inlet and a secondary steam outlet of the single-effect separator T08, a non-condensable gas outlet of a single-effect heater E06 and a material outlet of the double-effect forced circulation pump P18; the material inlet and the material outlet of the first-effect separator T08 are respectively communicated with the material outlet of the first-effect heater E06 and the material inlet of the first-effect forced circulation pump P17, and the steam inlet and the material inlet of the first-effect heater E06 are respectively communicated with the raw steam inlet of the steam pipeline LS and the material outlet of the first-effect forced circulation pump P17.

The multiple-effect falling film evaporation system may be a triple-effect falling film evaporation system, and specifically, as shown in fig. 1 and fig. 2, in the present embodiment, the multiple falling film evaporation assemblies include a single-effect falling film heater E01, a single-effect falling film separator T01, a single-effect falling film circulating pump P03/P04, a double-effect falling film heater E02, a double-effect falling film separator T02, a double-effect falling film circulating pump P05/P06, a triple-effect falling film heater E03, a triple-effect falling film separator T03, and a triple-effect falling film circulating pump P07/P08; a material first inlet, a steam inlet, a secondary steam outlet, a material second inlet, a material outlet and a non-condensable gas outlet of the primary-effect falling film heater E01 are respectively communicated with a material outlet of a primary-effect falling film circulating pump P03/P04, a raw steam inlet of a steam pipeline LS, a secondary steam inlet and a material outlet of a primary-effect falling film separator T01, a material inlet of a primary-effect falling film circulating pump P03/P04 and a non-condensable gas inlet of a secondary-effect falling film heater E02; a first material inlet, a second steam inlet, a second material inlet, a second steam outlet, a third material inlet, a material outlet, a non-condensable gas outlet and a condensed water outlet of the double-effect falling film heater E02 are respectively communicated with a material outlet of a double-effect falling film circulating pump P05/P06, a second steam outlet of a first-effect falling film separator T01, a material outlet of a first-effect falling film circulating pump P03/P04, a second steam inlet and a material outlet of a double-effect falling film separator T02, a material inlet of a double-effect falling film circulating pump P05/P06, a non-condensable gas inlet and a condensed water inlet of a double-effect falling film heater E02; a first material inlet, a second steam inlet, a second material inlet, a second steam outlet, a third material inlet and a material outlet of the triple-effect falling film heater E03 are respectively communicated with a material outlet of a triple-effect falling film circulating pump P07/P08, a second steam outlet of a double-effect falling film separator T02, a material outlet of a double-effect falling film circulating pump P05/P06, a second steam inlet and a material outlet of a triple-effect falling film separator T03 and a material inlet of a triple-effect falling film circulating pump P07/P08; the material outlet of the triple-effect falling film circulating pump P07/P08 is communicated with the material inlet of a material transfer tank T07.

Specifically, wastewater materials enter a multi-effect falling film evaporation system through a first feeding pump, and when the liquid level of an evaporator reaches a set liquid level, a circulating pump is started, and feeding is stopped; the first-effect falling film heater is heated to set temperature and pressure by raw steam, the material enters the first-effect falling film separator for solvent evaporation after passing through the first-effect falling film heater, secondary steam of the first-effect falling film heater exchanges heat with a second-effect material to evaporate a solvent of the second-effect material, the material enters the second-effect falling film separator for solvent evaporation after passing through the second-effect falling film heater, the concentration is continuous, the material enters the third-effect falling film separator for solvent evaporation after passing through the third-effect falling film heater, the material is viscous at the moment and enters the second-effect forced circulation evaporation system, the material enters the second-effect forced circulation heater for evaporation after passing through the second-effect separator, the concentration is continuous, the material enters the first-effect forced circulation heater after passing through the first-effect separator, and the evaporation of the material reaches the required concentration; and discharging the concentrated solution to the next procedure after the concentrated solution reaches the evaporation concentration.

As shown in fig. 1 and 2, in the present embodiment, a fourth pressure transmitter PIT04 is disposed at a circulating water inlet of the circulating cooling water pipeline CR, the steam pipeline LS is provided with a first pneumatic regulating valve AV01 (the pneumatic regulating valves in the present application may be all pneumatic regulating V-type valves), the first pneumatic regulating valve AV01 is located between a raw steam inlet of the steam pipeline LS and a steam inlet of the first-effect falling film heater E01, the first pneumatic regulating valve AV01 is electrically connected to the fourth pressure transmitter PIT04, and when a pressure of a pressure signal of the circulating cooling water pipeline CR is greater than a preset threshold (e.g., 0.15MPa), the system can operate. When the pressure of the pressure signal of the circulating cooling water pipeline CR is smaller than a preset threshold (for example, 0.15MPa), lasting for a first preset time (for example, 2s), the system alarms; for a second preset time (e.g., 10 seconds), the system is shut down, the first pneumatic regulator valve AV01 closes and stops all pumps, and an audible and visual alarm is activated.

As shown in fig. 1 and 2, in the present embodiment, the one-effect falling film heater E01 is provided with a first pressure transducer PIT01, and the first pressure transducer PIT01 is electrically connected to a first pneumatic adjustment valve AV 01. The first pneumatic regulating valve AV01 is linked with a first pressure transducer PIT01 of a single-effect falling film heater E01, and the pressure limit value can be set arbitrarily. When the pressure signal of the first-effect falling film heater E01 is higher than the set pressure, the opening of the first pneumatic regulating valve AV01 is reduced; when the pressure signal of the single-effect falling film heater E01 is lower than the set pressure, the opening degree of the first pneumatic regulating valve AV01 is increased.

In this embodiment, the frequency converter is shared by the first-effect falling film circulating pump P03 and the first-effect falling film circulating pump P04, the frequency converter is shared by the second-effect falling film circulating pump P05 and the second-effect falling film circulating pump P06, and the frequency converter is shared by the third-effect falling film circulating pump P07 and the third-effect falling film circulating pump P08, and the frequency can be set arbitrarily within a preset range, for example, the frequency can be set arbitrarily between 8Hz and 42Hz, and the working frequency of the frequency converter cannot be lower than 8Hz nor higher than 42Hz, or lower than 8Hz and higher than 42Hz for alarm.

As shown in fig. 1 and 2, in the present embodiment, the multi-effect falling film evaporation system further includes a first raw steam condensate water tank T04, a first raw steam condensate water pump P13/P14 and a preheater E04; the non-condensable gas outlet, the first condensed water inlet, the second condensed water inlet and the condensed water outlet of the first raw steam condensed water tank T04 are respectively communicated with the non-condensable gas inlet of the first effective falling film heater E01, the condensed water outlet of the first raw steam condensed water pump P13/P14, the condensed water outlet of the preheater E04 and the condensed water inlet of the first raw steam condensed water pump P13/P14; the material outlet, the condensed water inlet and the material inlet of the preheater E04 are respectively communicated with the material three-inlet and the condensed water outlet of the single-effect falling film heater E01 and the material outlet of the first feed pump P01/P02; the condensed water outlet of the first raw steam condensed water pump P13/P14 is communicated with a condensed water inlet of a third raw steam condensed water tank T15.

As shown in fig. 1 and fig. 2, in the present embodiment, a second pneumatic control valve AV02 is disposed on a communication pipeline between the material outlet of the preheater E04 and the material three-inlet of the single-effect falling film heater E01; the first effect falling film heater E01 is provided with a first liquid level meter LIT01, and the first liquid level meter LIT01 is electrically connected with a second pneumatic adjusting valve AV 02. The second pneumatic regulating valve AV02 is a feed regulating valve of the single-effect falling film heater E01, and is linked with a first liquid level meter LIT01 (the liquid level meters in the present application may be double-flange differential pressure type liquid level meters, etc.) of the single-effect falling film heater E01. The first level meter LIT01 of the single-effect falling film heater E01 is set to be a constant level, and the level value can be set arbitrarily. When the first liquid level meter LIT01 is lower than the set liquid level, the second pneumatic adjusting valve AV02 is adjusted to be large (the pneumatic adjusting valve in the application can be a pneumatic V-shaped adjusting valve and the like); when the first level gauge LIT01 is above the set level, the second pneumatic regulator valve AV02 is throttled down until closed. The first liquid level meter LIT01 is provided with a high-low liquid level alarm, and the alarm value can be set arbitrarily.

As shown in fig. 1 and fig. 2, in the present embodiment, a third pneumatic control valve AV03 is disposed on a communicating pipeline between a material outlet of the single-effect falling film circulating pump P03/P04 and a material secondary inlet of the double-effect falling film heater E02; the double-effect falling film heater E02 is provided with a second liquid level meter LIT02, and the second liquid level meter LIT02 is electrically connected with a third pneumatic adjusting valve AV 03. The third pneumatic regulating valve AV03 is a feed regulating valve of the double-effect falling film heater E02, which is linked with a second level gauge LIT02 of the double-effect falling film heater E02. The second level gauge LIT02 sets a constant liquid level, which can be arbitrarily set. When the second liquid level meter LIT02 is lower than the set liquid level, the third pneumatic adjusting valve AV03 is adjusted to be large; when the second level gauge LIT02 is above the set level, the third pneumatic regulator valve AV03 is throttled down until closed. The second liquid level meter LIT02 is provided with a high-low liquid level alarm, and the alarm value can be set arbitrarily.

As shown in fig. 1 and fig. 2, in the present embodiment, a fourth pneumatic control valve AV04 is disposed on a communicating pipeline between a material outlet of the double-effect falling film circulating pump P05/P06 and a material secondary inlet of the triple-effect falling film heater E03; the triple effect falling film heater E03 is provided with a third level gauge LIT03, the third level gauge LIT03 being electrically connected to a fourth pneumatic regulating valve AV 04. The fourth pneumatic regulating valve AV04 is a triple effect falling film heater E03 feed regulating valve, which is in linkage with a third level gauge LIT03 of the triple effect falling film heater E03. The third level gauge LIT03 sets a constant level, which can be arbitrarily set. When the third liquid level meter LIT03 is lower than the set liquid level, the fourth pneumatic adjusting valve AV04 is adjusted to be large; when the third level gauge LIT03 is above the set level, the fourth pneumatic regulator valve AV04 is throttled down until closed. The third liquid level meter LIT03 is provided with a high-low liquid level alarm, and the alarm value can be set arbitrarily.

As shown in fig. 1 and fig. 2, in this embodiment, the multiple-effect falling film evaporation system further includes a first measurement tank T05, and the material inlet and the material outlet of the first measurement tank T05 are respectively communicated with the material outlet and the material inlet of the triple-effect falling film circulation pump P07/P08.

Specifically, as shown in fig. 1 and fig. 2, in the present embodiment, a fifth pneumatic control valve AV05 is disposed on a communication pipeline between the material inlet of the triple-effect falling film circulating pump P07/P08 and the material inlet of the material transfer tank T07, the first measuring tank T05 is provided with a first densimeter DIT01 (densimeters in the present application may be tuning fork densimeters), and the first densimeter DIT01 is electrically connected to the fifth pneumatic control valve AV 05. The fifth pneumatic regulating valve AV05 is a discharge regulating valve, and is linked with the first densitometer DIT01 of the first measuring tank T05, and the first densitometer DIT01 sets a constant density value, which can be arbitrarily set. When the first densimeter DIT01 is greater than the set density value, the fifth pneumatic adjustment valve AV05 is adjusted to be large; when the first densitometer DIT01 is less than the set density value, the fifth pneumatic adjustment valve AV05 is adjusted smaller until closed.

As shown in fig. 1 and 2, in the present embodiment, the multiple-effect evaporator for treating lithium nitrate wastewater further includes a first condenser E05 and a second condenser E08; a secondary steam inlet, a non-condensable gas inlet and a condensed water inlet of the first condenser E05 are respectively communicated with a secondary steam outlet of the triple-effect falling film separator T03, a non-condensable gas outlet of the triple-effect falling film heater E03 and a condensed water outlet; a secondary steam inlet, a non-condensable gas inlet and a condensed water inlet of the second condenser E08 are respectively communicated with a secondary steam outlet of the two-effect separator T09, a non-condensable gas outlet of the two-effect heater E07 and a condensed water outlet, and a non-condensable gas inlet of the two-effect heater E07 is communicated with a non-condensable gas outlet of the one-effect heater E06.

Moreover, as shown in fig. 1 and fig. 2, in the present embodiment, the multiple-effect falling film evaporation system further includes a first condensed water negative pressure pump P09/P10, a second condensed water negative pressure pump P19/P20, and an evaporated condensed water tank T16; a condensate inlet and a condensate outlet of the first condensate negative pressure pump P09/P10 are respectively communicated with a condensate outlet of the first condenser E05 and a condensate inlet of the evaporative condensate water tank T16; the condensed water inlet and the condensed water outlet of the second condensed water negative pressure pump P19/P20 are respectively communicated with the condensed water outlet of the second condenser E08 and the condensed water second inlet of the evaporated condensed water tank T16.

Specifically, as shown in fig. 1 and fig. 2, in the present embodiment, a communication pipeline between a condensed water outlet of the first raw steam condensed water pump P13/P14 and a condensed water first inlet of the third raw steam condensed water tank T15 is provided with a first pneumatic switch valve ASV06, the first raw steam condensed water tank T04 is provided with a fourth liquid level meter LIT04 (the fourth liquid level meter LIT04 may be a magnetic flap liquid level meter), and the fourth liquid level meter LIT04 is electrically connected with the first pneumatic switch valve ASV 06. The first pneumatic switch valve ASV06 is a condensed water discharge switch valve, and is linked with the fourth liquid level meter LIT04 of the first raw steam condensed water tank T04, and the fourth liquid level meter LIT04 sets a liquid level range, and the liquid level range can be set arbitrarily. When the fourth liquid level meter LIT04 is lower than the set low liquid level for a preset time, the first pneumatic switch valve ASV06 is closed; when the fourth level gauge LIT04 is above the set high level for a preset time, the first pneumatic switching valve ASV06 is opened. The third liquid level meter LIT03 is provided with a high-low liquid level alarm, and the alarm value can be set arbitrarily.

As shown in fig. 1 and fig. 2, in this embodiment, the multiple-effect falling film evaporation system further includes a first emergency tank T06, and a material inlet of the first emergency tank T06 is communicated with a material outlet of the raw material tank T00, a material outlet of the first-effect falling film heater E01, a material outlet of the second-effect falling film heater E02, and a material outlet of the third-effect falling film heater E03.

As shown in fig. 1 and 2, in the present embodiment, the steam pipe LS is provided with a seventh pneumatic adjusting valve AV07, the seventh pneumatic adjusting valve AV07 is located between a raw steam inlet of the steam pipe LS and a steam inlet of the one-effect heater E06, the seventh pneumatic adjusting valve AV07 is electrically connected to the fourth pressure transmitter PIT04, and the system side can be operated when the pressure of the pressure signal of the circulating cooling water pipe CR is greater than a preset threshold value (e.g., 0.15 MPa). When the pressure of the pressure signal of the circulating cooling water pipeline CR is smaller than a preset threshold (for example, 0.15MPa), lasting for a first preset time (for example, 2s), the system alarms; for a second preset time (e.g., 10s), the system is shut down, the seventh pneumatic regulator AV07 closes and stops all pumps, and an audible and visual alarm is turned on.

As shown in fig. 1 and fig. 2, in the present embodiment, the material transfer tank T07 is provided with a fifth level meter LIT05 (the fifth level meter LIT05 may be an ultrasonic level meter), and the fifth level meter LIT05 of the material transfer tank T07 is provided with a high-low level alarm, and the alarm value may be set arbitrarily.

In the present embodiment, the one-effect heater E06 is provided with a fifth pressure transmitter PIT05, and the fifth pressure transmitter PIT05 is electrically connected to a seventh pneumatic regulator valve AV 07. The seventh pneumatic regulating valve AV07 is linked with the fifth pressure transmitter PIT05 of the first-effect heater E06, and the pressure range can be set arbitrarily. When the pressure signal of the first-effect heater E06 is higher than the set pressure, the opening of the seventh pneumatic regulating valve AV07 is reduced; when the pressure signal of the one-effect heater E06 is lower than the set pressure, the seventh pneumatic regulator valve AV07 is opened to be large.

As shown in fig. 1 and 2, in the present embodiment, an eighth pneumatic control valve AV08 is disposed on a communication pipeline between the material outlet of the second feed pump P15/P16 and the material inlet of the two-effect separator T09, the two-effect separator T09 is provided with a seventh liquid level meter LIT07, and the seventh liquid level meter LIT07 is electrically connected to the eighth pneumatic control valve AV 08. The eighth pneumatic regulator valve AV08 is a feed regulator valve for the two-effect separator T09, which is in linkage with a seventh level gauge LIT07 of the two-effect separator T09. The seventh level meter LIT07 of the two-effect separator T09 sets a constant liquid level, and the level value can be set arbitrarily. When the seventh liquid level meter LIT07 is lower than the set liquid level, the eighth pneumatic adjusting valve AV08 is adjusted to be large; when the seventh level gauge LIT07 is above the set level, the eighth pneumatic regulator valve AV08 is throttled down until closed. The seventh liquid level meter LIT07 is provided with a high-low liquid level alarm, and the alarm value can be set arbitrarily.

As shown in fig. 1 and 2, in the present embodiment, a ninth pneumatic control valve AV09 is disposed on a communication pipeline between the material outlet of the two-effect forced circulation pump P18 and the material inlet of the one-effect forced circulation pump P17, the one-effect separator T08 is provided with a sixth liquid level meter LIT06, and the sixth liquid level meter LIT06 is electrically connected to the ninth pneumatic control valve AV 09. The ninth pneumatic regulator valve AV09 is a feed regulator valve of the single-effect separator T08, which is in linkage with a sixth level gauge LIT06 of the single-effect separator T08. The sixth level gauge LIT06 of the single effect separator T08 sets a constant liquid level, which can be arbitrarily set. When the sixth liquid level meter LIT06 is lower than the set liquid level, the ninth pneumatic adjusting valve AV09 is adjusted to be large; when the sixth level gauge LIT06 is above the set level, the ninth pneumatic regulator valve AV09 is throttled down until closed. The sixth liquid level meter LIT06 is provided with a high-low liquid level alarm, and the alarm value can be set arbitrarily.

As shown in fig. 1 and 2, in the present embodiment, the two-effect forced circulation evaporation system further includes a second raw steam condensate water tank T12 and a second raw steam condensate water pump P25/P26; a non-condensable gas outlet, a condensed water first inlet, a condensed water second inlet and a condensed water outlet of the second raw steam condensed water tank T12 are respectively communicated with the non-condensable gas inlet of the first effective heater E06, the condensed water outlet of the second raw steam condensed water pump P25/P26, the condensed water outlet of the first effective heater E06 and the condensed water inlet of the second raw steam condensed water pump P25/P26; the condensed water outlet of the second raw steam condensed water pump P25/P26 is communicated with the second condensed water inlet of the third raw steam condensed water tank T15.

Specifically, as shown in fig. 1 and fig. 2, in the present embodiment, an eleventh pneumatic switch valve ASV11 is disposed on a communication pipeline between a condensed water outlet of the second raw steam condensed water pump P25/P26 and a condensed water second inlet of the third raw steam condensed water tank T15, the second raw steam condensed water tank T12 is provided with a ninth liquid level meter LIT09 (the ninth liquid level meter LIT09 may be a magnetic flap liquid level meter linkage), and the ninth liquid level meter LIT09 is electrically connected to the eleventh pneumatic switch valve ASV 11. The eleventh pneumatic switch valve ASV11 is a condensed water discharge switch valve, and the ninth level gauge LIT09 of the second raw steam condensed water tank T12 and the ninth level gauge LIT09 of the second raw steam condensed water tank T12 set a liquid level range, which can be set arbitrarily. When the ninth level gauge LIT09 is below the set low level for a preset time (e.g., 2s), the eleventh pneumatic switching valve ASV11 is closed; when the ninth level gauge LIT09 is above the set high level for a preset time, the eleventh pneumatic switching valve ASV11 is opened. The ninth liquid level meter LIT09 is provided with a high-low liquid level alarm, and the alarm value can be set arbitrarily.

As shown in fig. 1 and fig. 2, in the present embodiment, the dual-effect forced circulation evaporation system further includes a discharge concentration pump P23/P24, a second measurement tank T13, a third measurement tank T14, and a concentrate buffer tank T10; the material inlet and the material outlet of the second measuring tank T13 are respectively communicated with the material outlet and the material inlet of an effective forced circulation pump P17; a first material inlet, a second material inlet, a third material inlet and a material outlet of the concentrated solution cache tank T10 are respectively communicated with a material outlet of a third measuring tank T14, a material outlet of a discharge concentration pump P23/P24, a material outlet of a first-effect forced circulation pump P17 and a material inlet of a discharge concentration pump P23/P24; the material inlet of the third measuring tank T14 is communicated with the material outlet of the discharging concentration pump P23/P24.

Specifically, as shown in fig. 1 and 2, in the present embodiment, the concentrate buffer tank T10 is provided with an eighth level meter LIT08 (the eighth level meter LIT08 may be an ultrasonic level meter). The eighth liquid level meter LIT08 of the concentrated solution buffer tank T10 is provided with a high-low liquid level alarm, and the alarm value can be set arbitrarily.

In this embodiment, the concentrate buffer tank T10 is provided with an eighth level meter LIT08 (the eighth level meter LIT08 may be a tuning fork densitometer). The third densitometer DIT03 is a densitometer that monitors the material density in the concentrate buffer tank T10, both instantaneous and cumulative values on the screen. The third densimeter DIT03 sets the alarm with high and low density values, and the alarm value can be set arbitrarily.

As shown in fig. 1 and fig. 2, in this embodiment, the two-effect forced circulation evaporation system further includes a second emergency tank T11, a material inlet of the second emergency tank T11 is communicated with a material outlet of the two-effect separator T09, a material outlet of the one-effect separator T08, a material outlet of the second measuring tank T13, a material outlet of the two-effect forced circulation pump P18, a material outlet of the concentrated solution buffer tank T10, and a material outlet of the material transfer tank T07.

Specifically, as shown in fig. 1 and 2, in the present embodiment, a tenth pneumatic control valve AV10 is disposed on a communication pipeline between the material outlet of the one-effect forced circulation pump P17 and the material three-inlet of the concentrate buffer tank T10, the second measuring tank T13 is provided with a second densimeter DIT02 (the second densimeter DIT02 may be a tuning fork densimeter), and the second densimeter DIT02 is electrically connected to the tenth pneumatic control valve AV 10. The tenth pneumatic adjustment valve AV10 is a discharge adjustment valve, and is linked to the second densimeter DIT02 of the second measurement tank T13, and the second densimeter DIT02 of the second measurement tank T13 sets a constant density value, which can be arbitrarily set. When the second densimeter DIT02 of the measuring tank T13 is greater than the set density value, the tenth pneumatic regulating valve AV10 is adjusted to be large; when the measuring tank T13 heats up and the second densitometer DIT02 is less than the set density value, the tenth pneumatic regulating valve AV10 is reduced until closed.

As shown in fig. 1 and 2, the multiple-effect evaporator for treating lithium nitrate wastewater further includes a circulating cooling water pipe CR; the first feed pump P01/P02, the first-effect falling film circulating pump P03/P04, the second-effect falling film circulating pump P05/P06, the third-effect falling film circulating pump P07/P08, the first condensate water negative pressure pump P09/P10, the first vacuum injection unit P11/P12, the first raw steam condensate water pump P13/P14, the second feed pump P15/P16, the first-effect forced circulating pump P17, the second-effect forced circulating pump P18, the second condensate water negative pressure pump P19/P20, the second vacuum injection unit P21/P22, the discharge concentration pump P22/P22 and the second raw steam condensate water pump P22/P22 are all in circulating communication with the circulating cooling water pipeline CR. The device comprises a first feeding pump P01/P02, a first-effect falling film circulating pump P03/P04, a second-effect falling film circulating pump P05/P06, a third-effect falling film circulating pump P07/P08, a first condensate water negative pressure pump P09/P10, a first vacuum injection machine set P11/P12, a first raw steam condensate water pump P13/P14, a second feeding pump P15/P16, a second condensate water negative pressure pump P19/P20, a second vacuum injection machine set P21/P22, a discharging concentration pump P23/P24 and a second raw steam condensate water pump P25/P26 which are in a one-use one-standby double-pump mode, wherein the double pumps are in an interlocking type and can only be started by the protector, when a motor detects that one of the pumps does not work, steam is stopped, a sound-light alarm is started at the same time, a flicker is given to a fault point position, a worker is reminded to manually switch the other pump, and after the switch is finished, the alarm is eliminated by pressing a reset key, the system is rebooted.

The working principle of the multi-effect evaporator for treating lithium nitrate wastewater is described below with reference to a specific embodiment:

the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.