CN215781585U - Multiple-effect evaporation crystallizer suitable for viscose fiber acid bath concentration crystallization - Google Patents
Multiple-effect evaporation crystallizer suitable for viscose fiber acid bath concentration crystallization Download PDFInfo
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- CN215781585U CN215781585U CN202121743202.7U CN202121743202U CN215781585U CN 215781585 U CN215781585 U CN 215781585U CN 202121743202 U CN202121743202 U CN 202121743202U CN 215781585 U CN215781585 U CN 215781585U
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Abstract
The utility model discloses a multiple-effect evaporative crystallizer suitable for viscose fiber acid bath concentration crystallization, which comprises a plurality of effect bodies connected in series step by step, wherein the effect bodies comprise a plurality of evaporation concentration effect bodies and at least one crystallization effect body; each evaporation and concentration effect body comprises a first heater and a separation chamber connected with the first heater, and the crystallization effect body comprises a second heater and a crystallization chamber connected with the second heater. The multi-effect evaporation crystallizer can effectively guarantee the applicability of the multi-effect evaporation concentration of viscose acid bath concentration, can effectively ensure the complete recycling of evaporation water and the complete recycling of concentrated acid liquor, and can also ensure the full utilization of heat energy by adopting a multi-effect evaporation technology.
Description
Technical Field
The utility model relates to the technical field of viscose acid bath treatment, in particular to a multi-effect evaporation concentration crystallization device for viscose acid bath concentration crystallization.
Background
The evaporation concentration crystallization of the viscose acid bath is to heat the viscose acid bath to a boiling state in a heat exchange mode, so that most of water can be vaporized and separated and condensed for recycling, and the acid concentration in the viscose acid bath after a large amount of water is evaporated can be improved or can be recycled until sodium sulfate is separated out and crystallized; at least two sets of equipment are currently used for the concentration, one set for the crystallization and the other set for the crystallization (the second set of equipment is sometimes the same as the first set and is also different in structure).
The multi-stage flash evaporation adopted by the traditional viscose acid bath evaporation concentration crystallization is a high energy consumption process, and the development and the use of a multi-effect evaporation concentration crystallizer realize the full utilization of heat energy, so that the evaporation concentration crystallization is not the traditional high energy consumption process any more; meanwhile, the traditional viscose acid bath evaporation and concentration equipment basically adopts a non-metal graphite product as a heat transfer medium for heat exchange, so that the service life of the equipment is short, and the replacement cost of the equipment is high. Therefore, whether the configuration of the multi-effect evaporation concentration crystallization equipment for viscose acid bath concentration crystallization can meet the requirement of viscose acid bath treatment and can make full use of heat energy, after a heat exchanger made of a metal material instead of a graphite material is adopted, the equipment has a long service life and can improve the heat efficiency, and the investment and operation costs of the equipment are all lower, so that the equipment has higher requirement for the novel multi-effect evaporation concentration crystallization device for viscose acid bath treatment.
SUMMERY OF THE UTILITY MODEL
Aiming at the technical problems existing in the prior art, the utility model provides the multiple-effect evaporative crystallizer suitable for acid bath concentration and crystallization of viscose fibers, which ensures that the acid bath concentration and crystallization of the viscose fibers can be completed by a safe, energy-saving, environment-friendly and efficient evaporative concentration and crystallization technology.
In order to achieve the purpose, the utility model adopts the technical scheme that:
a multi-effect evaporation crystallizer suitable for viscose fiber acid bath concentration crystallization is characterized in that: the device comprises a plurality of effect bodies which are connected in series step by step, wherein the plurality of effect bodies comprise a plurality of evaporation concentration effect bodies and at least one crystallization effect body, the evaporation concentration effect bodies and the crystallization effect body are respectively provided with a steam inlet and a steam outlet, and the steam inlet between the adjacent evaporation concentration effect bodies or between the adjacent evaporation concentration effect bodies and the crystallization effect bodies is correspondingly connected with the steam outlet; each evaporation and concentration effect body comprises a first heater and a separation chamber connected with the first heater, and the crystallization effect body comprises a second heater and a crystallization chamber connected with the second heater.
The multi-effect evaporation crystallizer is further improved in that the first heater and the second heater are made of metal materials.
The multi-effect evaporative crystallizer of the utility model is further improved in that the number of the crystallization effect bodies is one, and the crystallization effect bodies are positioned at the second-stage or the next-stage effect bodies in a plurality of effect bodies.
The multi-effect evaporation crystallizer is further improved in that the crystallization effect body is provided with a discharge hole for discharging the concentrated acid bath and crystal slurry of sodium sulfate crystals.
The multi-effect evaporative crystallizer is further improved in that the multi-effect evaporative crystallizer further comprises a steam booster pump connected with a steam outlet of at least one separation chamber or one crystallization chamber, the first stage effect body is an evaporation concentration effect body, and an outlet of the steam booster pump is connected with a steam inlet of a first heater in the first stage effect body.
The multi-effect evaporation crystallizer is further improved in that the number of the evaporation and concentration effect bodies is not less than three, the former three effect bodies in the plurality of effect bodies are all evaporation and concentration effect bodies, and the inlet of the steam booster pump is connected with the steam outlet of any separation chamber in the former three evaporation and concentration effect bodies.
The multi-effect evaporation crystallizer is further improved in that the first stage effect body is an evaporation and concentration effect body, and the first heater of the multi-effect evaporation crystallizer is provided with the steam inlet and is connected with an output pipeline of fresh steam when in use.
The multi-effect evaporative crystallizer is further improved in that a condensed water outlet is formed in the first heater or the second heater of the second final effect body and is connected with a condensed water tank; and a secondary steam outlet is arranged in the separation chamber or the crystallization chamber of the second final effect body and is connected with a condenser.
The multi-effect evaporation crystallizer is further improved in that the condenser adopts a shell and tube condenser or a mixed condenser or a combination of the shell and tube condenser and the mixed condenser.
The multi-effect evaporative crystallizer is further improved in that the condensed water tank is provided with two inlets, one is connected with the condensed water outlet of the first heater or the second heater of the final effect body, the other is connected with the condensed water outlet of the condenser, and the outlet of the condensed water tank is connected with the inlet of a condensed water pump.
The multi-effect evaporation crystallizer is further improved in that each evaporation concentration effect body comprises a separation chamber and one or two first heaters which are connected with the separation chamber in series; each crystallization effect body comprises a crystallization chamber and one or two second heaters which are connected with the crystallization chamber in series.
The multi-effect evaporative crystallizer is further improved by further comprising at least one preheater which is connected with at least one first heater or second heater through a steam pipeline.
The multi-effect evaporation crystallizer is further improved in that the number of the preheaters is multiple, each effect body except the last effect body is provided with one preheater, the preheaters are connected in series step by step, the last preheater is connected with the first effect body, and the first preheater is connected with the next last effect body.
The multi-effect evaporation crystallizer is further improved in that the multi-effect evaporation crystallizer also comprises a flash tank which is connected with the first stage preheater.
Due to the adoption of the technical scheme, the utility model has the following technical effects:
the utility model is suitable for the multiple-effect evaporation concentration crystallization technology of viscose fiber acid bath concentration crystallization, can effectively provide guarantee for the applicability of adopting the multiple-effect evaporation concentration crystallization for the viscose fiber acid bath concentration crystallization, can effectively ensure the full recycling of evaporated water, the full crystallization recycling of sodium sulfate and the full recycling of concentrated viscose fiber acid bath, and simultaneously ensure that the multiple-effect evaporation technology can be adopted to achieve the full utilization of heat energy, and simultaneously ensure that the equipment has a very long service life because a metal material is adopted to replace a heat exchanger of a traditional graphite material, thereby ensuring that the viscose fiber acid bath concentration crystallization can be completed under the safe, energy-saving, environment-friendly and efficient evaporation concentration crystallization technology.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of the overall structure of an embodiment 1 of the multi-effect evaporative crystallizer (five-effect TVR extraction effect I) suitable for viscose fiber acid bath concentration crystallization of the present invention.
Fig. 2 is a schematic diagram of the overall structure of the multi-effect evaporative crystallizer of the embodiment 2 (four-effect TVR pumping effect II) suitable for viscose fiber acid bath concentration crystallization of the present invention.
Fig. 3 to 5 are schematic diagrams of three heat source steam supply modes of the multi-effect evaporative crystallizer of the present invention, wherein fig. 3 shows a TVR heat source supplement mode with I-effect, fig. 4 shows a TVR heat source supplement mode with II-effect, and fig. 5 shows a mode in which fresh steam is directly used as a heat source.
Fig. 6 to 7 are schematic diagrams of two discharging modes of the multi-effect evaporative crystallizer, wherein fig. 6 shows a secondary final effect discharging mode, and fig. 7 shows a secondary final effect discharging mode.
Fig. 8 to 12 are schematic diagrams of five condensing modes of the multi-effect evaporative crystallizer, wherein fig. 8 shows a three-stage tube array condenser, fig. 9 shows a two-stage tube array condenser, fig. 10 shows a one-stage tube array condenser, fig. 11 shows a two-stage hybrid condenser, and fig. 12 shows a one-stage hybrid condenser.
Fig. 13 and 14 are schematic diagrams of two heater heating modes of the multi-effect evaporative crystallizer, wherein fig. 13 shows a double heater heating mode, and fig. 14 shows a single heater heating mode.
The correspondence of reference numerals is as follows:
1-an I-effect heater; 2-I effect separation chamber; 3-II effect heaters; 4-II effect separation chamber; 5-III effect heaters; 6-III effect separation chamber; 7-IV effect heaters; 8-IV effect separation chamber; a 9-V effect heater; a 10-V effect separation chamber; 11-a steam booster pump; 12-a primary preheater; 13-a secondary preheater; 14-a tertiary preheater; 15-a four-stage preheater; 16-a flash tank; 17-a condensate tank; 18-a condenser; 20-a first stage condenser; 21-a second stage condenser; 22-third stage condenser; 23-first order mixing condenser; 24-two-stage hybrid condenser.
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.
The utility model provides a multiple-effect evaporative crystallizer suitable for viscose fiber acid bath concentration crystallization, which comprises a plurality of effect bodies connected in series step by step, wherein the plurality of effect bodies comprise a plurality of evaporation concentration effect bodies and at least one crystallization effect body, the plurality of evaporation concentration effect bodies and the at least one crystallization effect body are respectively provided with a steam inlet and a steam outlet, and the steam inlet and the steam outlet between the adjacent evaporation concentration effect bodies or between the adjacent evaporation concentration effect bodies and the crystallization effect bodies are correspondingly connected to form the multiple-effect evaporative crystallizer.
Wherein, each evaporation concentration effect body comprises a first heater and a separation chamber connected with the first heater, and each crystallization effect body comprises a second heater and a crystallization chamber connected with the second heater. Preferably, the first heater and the second heater are made of metal materials, so that the equipment has longer service life and can improve the heat efficiency compared with a heat exchanger made of traditional graphite materials.
The multiple effects of the multiple-effect evaporation crystallizer consist of four effects or five effects or more effects, and the four effects, the five effects or more effects can adopt ascending film (or falling film or forced or mixed) circulation (natural circulation or forced circulation). The evaporation concentration effect body is generally positioned at the first few effects of the plurality of effect bodies, the crystallization effect body is generally positioned at the last effect or the next last effect body, the evaporation concentration effect body is used for evaporation concentration of the viscose fiber acid bath with lower concentration, the crystallization effect body is used for evaporation concentration of the viscose fiber acid bath with higher concentration and crystallization of sodium sulfate, and concentrated acid liquor and crystal slurry of sodium sulfate crystallization are discharged from the crystallization effect body.
And a condensed water outlet is arranged at an outlet of the last effect body in the multi-effect evaporation crystallizer, the condensed water outlet is connected with a condenser, an outlet of the condenser is connected with a condensed water tank, and the condensed water after the heat source in the multi-effect evaporation crystallizer completes heat exchange is collected to the condensed water tank and can be discharged by a pump.
Referring to fig. 1, an embodiment of a five-effect evaporative crystallizer is shown, comprising, in order from left to right: the device comprises an I-effect heater 1, an I-effect separation chamber 2, an II-effect heater 3, an II-effect separation chamber 4, an III-effect heater 5, an III-effect separation chamber 6, an IV-effect heater 7, an IV-effect separation chamber 8, a V-effect heater 9, a V-effect crystallization chamber 10, a condensed water tank 17 and a condenser 18.
A steam booster pump (TVR)11 is arranged in front of the I-effect heater 1, the steam booster pump (TVR)11 is provided with two steam inlets, one steam inlet is used for absorbing fresh steam, the other steam inlet is connected with the steam outlet of the I-effect separation chamber 2, the outlet of the steam booster pump (TVR)11 is connected with the steam inlet of the I-effect heater 1, and secondary steam evaporated from the I-effect separation chamber 2 can be extracted by the steam booster pump (TVR)11 to be mixed with the fresh steam and then enter the I-effect heater 1 to serve as a supplementary steam system.
Referring to fig. 2, there is shown an embodiment of a four-effect evaporative crystallizer, which differs from the five-effect evaporative crystallizer of the embodiment of fig. 1 only in that there is one less evaporative concentration effect, and a vapor booster pump (TVR)11 does not extract secondary vapor from one effect, but instead: secondary steam is extracted from the double-effect body, namely the II-effect separation chamber 4, and is mixed with fresh steam and then sent into the I-effect heater 1 to serve as a supplementary steam system. In this embodiment, the final effect (i.e. the IV effect) is used as the crystallization effect, and the IV effect separation chamber is used as the crystallization chamber.
Taking the five-effect evaporative crystallizer shown in fig. 1 as an example, the following is further explained:
referring to fig. 1, the five-effect evaporative crystallizer includes five effect bodies, wherein the first effect body is used for the first evaporation and concentration of the viscose acid bath with lower concentration, and includes two I-effect heaters 1 connected in series and an I-effect separation chamber 2 connected with the I-effect heaters 1; the second effect body is used for the second evaporation concentration of the viscose acid bath with lower concentration and comprises two serially connected II-effect heaters 3 connected with the I-effect separation chamber 2 and an II-effect separation chamber 4 connected with the II-effect heaters 3; the third effect is used for the third evaporation concentration of the viscose acid bath with lower concentration and comprises two III-effect heaters 5 connected with the II separation chamber 4 in series and a III-effect separation chamber 6 connected with the III-effect heaters 5; the fourth effect is used for fourth evaporation concentration of the viscose acid bath with lower concentration and comprises two serially connected IV effect heaters 7 connected with the III effect separation chamber 6 and an IV effect separation chamber 8 connected with the IV effect heaters 7; the fifth effect is used for fifth evaporation concentration of viscose fiber acid bath with higher concentration and crystallization of sodium sulfate, and comprises two V-effect heaters 9 connected in series with an IV-effect separation chamber 8 and a V-effect crystallization chamber 10 connected with the V-effect heaters 9. It should be understood that in other embodiments of the multi-effect evaporative crystallizer of the present invention, the number of effects of the effect body can be increased or decreased appropriately, but at least two effects should be eliminated. One inlet of the steam booster pump 11 is connected with the outlet of the I-effect separation chamber 2, the other inlet is connected with a fresh steam source, and the outlet of the steam booster pump 11 is connected with the steam inlet of the I-effect heater 1.
Part (or all) of the secondary steam evaporated by the first effect body enters the steam booster pump 11 and then is sent back to the I-effect heater 1 to be used as heating steam, the other part (or all) of the secondary steam enters the II-effect heater 3 to be used as a heating heat source, and condensed water after the heat exchange of the heating heat source is completed is collected to a condensed water tank; and secondary steam evaporated by the second and third (or more) effect bodies is sent to the third and fourth (or more) effect heaters through the communicating pipe to be used as heating heat sources, and condensed water after the heat sources finish heat exchange is collected into a condensed water tank and then is discharged by a pump.
The utility model is suitable for the feed inlet of the last effect (namely V effect) body of the multi-effect evaporation crystallizer for viscose fiber acid bath concentration to be provided with a set of feed flow control system, the feed flow control system comprises a flow sensor (or a liquid level sensor) and an automatic regulating valve (or a pump with variable frequency control of flow), the opening degree of the automatic regulating valve (or the flow of the pump with variable frequency control of flow) is automatically regulated and controlled according to the flow value (or the liquid level value) set by the flow sensor (or the liquid level sensor), the set value of the flow sensor (or the liquid level sensor) is set according to the rated required feed amount (or the liquid level value) of the V effect body, the multi-effect evaporation crystallizer is also connected with a set of electrical control cabinet, the automatic regulating valve (or the pump with variable frequency control of flow) and the flow sensor (or the liquid level sensor) and the automatic program control system of the electrical control cabinet form a feed automatic control system, the control ends of the automatic feeding control system and the automatic program control system are positioned in the control cabinet, and the control cabinet is provided with an Ethernet interface for communication connection with a central control room.
The feed inlet of the first effect body (i.e. the I effect body) of the multi-effect evaporation concentration crystallizer for viscose acid bath concentration crystallization is provided with a feed flow control system, the feed flow control system comprises a liquid level sensor and an automatic regulating valve (or a pump with variable frequency control of flow), the opening degree of the automatic regulating valve is automatically regulated and controlled according to the liquid level value set by the liquid level sensor, the set value of the liquid level sensor is set according to the necessary liquid level of the last effect evaporator, the multi-effect evaporation concentration crystallizer of the utility model is connected with a set of electric control cabinet, the automatic control valve (or pump with variable frequency control of flow rate), the liquid level sensor and the control system of the electric control cabinet form a feeding automatic control system, the control ends of the feeding control system and the automatic program control system are positioned in the control cabinet, and the control cabinet is provided with an Ethernet interface for communication connection with a central control room.
The feed inlet of the second effect (i.e. II effect) effect body of the multi-effect evaporative crystallizer suitable for viscose acid bath concentration is provided with a two-effect differential pressure liquid level balancing device, the two-effect differential pressure liquid level balancing device can automatically balance overfeeding according to the liquid level and the differential pressure of the two-effect body, and the differential pressure liquid level balancing device can also be replaced by a liquid level transmitter and an adjusting valve or a pump controlled by frequency conversion.
The feed inlet of the third effect (namely III effect) body of the multi-effect evaporator suitable for viscose fiber acid bath concentration is provided with a two-three effect differential pressure liquid level balancing device, the two-three effect differential pressure liquid level balancing device can automatically balance overfeeding according to the liquid level and the differential pressure of the two-three effect, and the differential pressure liquid level balancing device can also be replaced by a liquid level transmitter and a regulating valve or a variable frequency control pump.
The feed inlet of the fourth effect (namely IV effect) body of the multi-effect evaporator suitable for viscose fiber acid bath concentration is provided with a three-four effect pressure difference liquid level balancing device, and the three-four effect pressure difference liquid level balancing device can automatically balance overfeeding according to the liquid level and the pressure difference of the three-four effect.
The concentrated solution discharge port of the second ineffective (namely V-effect) effective body of the multi-effect evaporator suitable for viscose fiber acid bath concentration is provided with a set of discharge flow control system, the discharge flow control system comprises a concentration sensor and an automatic valve, concentrated solution reaching a concentration value is sent out, and feed liquid not reaching the concentration value is recovered. The multi-effect evaporator suitable for viscose fiber spinning acid bath concentration is also connected with an automatic control cabinet, the automatic valve, the concentration sensor and an automatic program control system of the automatic control cabinet form an automatic discharging control system, and control ends of the automatic discharging control system and the automatic program control system are positioned in the control cabinet.
The crystal slurry material discharge port of the final effect (namely V effect) or the next final effect (namely IV effect) effect body of the multi-effect evaporator suitable for viscose fiber spinning acid bath concentration is provided with a discharge port.
The first effect heater (i.e. I effect heater) of the multi-effect evaporator suitable for viscose fiber spinning acid bath concentration is provided with an automatic regulating valve and a pressure transmitter or a temperature transmitter at a supplementary heating steam inlet (i.e. a steam inlet connected with TVR), the opening degree of the automatic regulating valve automatically regulates and controls the set value of the pressing force transmitter or the temperature transmitter, the set value of the pressure transmitter or the temperature transmitter is set according to the design operation parameters of the multi-effect evaporation concentration crystallizer for the acid bath concentration crystallization of the viscose fiber and is corrected and set according to the parameters when the equipment actually operates, the multi-effect evaporation concentration crystallizer for acid bath concentration crystallization of viscose is connected with a set of electric control cabinet, the automatic regulating valve, the pressure transmitter, the temperature transmitter and a control system of the electrical control cabinet form a heating automatic control system, and control ends of the heating control system and the automatic program control system are positioned in the control cabinet.
In the above embodiment of the five-effect evaporative crystallizer, the steam air source utilizes 1 steam booster pump (TVR)11, and the secondary steam evaporated from the separation chamber of the second effect body is pumped out by the steam booster pump (TVR)11 to be mixed with the fresh steam and then enter the heater shell of the first effect, as shown in fig. 3, besides this way, the embodiment of the present invention also provides another two ways of entering the steam heat source:
the first method comprises the following steps: fresh steam directly enters a shell layer of a first-effect heater to be used as a heat source, namely a steam booster pump (TVR) is not needed, and the method is shown in figure 5;
and the second method comprises the following steps: the secondary steam evaporated from the second effect separation chamber 4 of the second effect body is extracted by using 1 steam booster pump (TVR)11 and mixed with fresh steam by the steam booster pump (TVR)11, and then enters the shell of the first effect heater 1, as shown in fig. 4.
It is easy to think that on the basis of the three steam heat source entering modes provided by the utility model, the heat source can be obtained by analogy, 1 or more steam booster pumps (TVR) are utilized to extract the secondary steam evaporated from three (or more) effect materials to mix with the fresh steam and then enter the heater shell layer of the first effect, namely, the steam booster pumps (TVR) can extract the secondary steam evaporated from any one, two or even more effect bodies and mix with the fresh steam, the number of the steam booster pumps (TVR) is not limited, and a plurality of the steam booster pumps (TVR) can work simultaneously.
In the embodiment of the five-effect evaporative crystallizer, as shown in fig. 1, the discharging position discharges the concentrated material in the last effect body (i.e. the last effect V) which is used as the crystallization effect body, as shown in fig. 7.
Besides, the penultimate effect, i.e. the IV effect in the embodiment (five-effect evaporative crystallizer) of fig. 1, can be used as the discharging effect, as shown in fig. 6.
Referring to fig. 1, in the embodiment of the five-effect evaporation crystallizer suitable for viscose fiber spinning acid bath concentration of the utility model, at least one preheater is further included and is connected with at least one heater through a steam pipeline. With continued reference to fig. 1, in the present embodiment, the number of the preheaters is four, and the preheaters are respectively a first-stage preheater 12, a second-stage preheater 13, a third-stage preheater 14, and a fourth-stage preheater 15 (or more), and each stage of the preheaters except the final effect body is connected to one preheater through a steam pipeline. And, in the multi-stage preheater, the preheating outlets of the preheaters of the respective stages except for the final stage preheater, i.e., the four-stage preheater 15, are connected to the preheating inlet of the preheater of the next stage, and the preheating outlet of the final stage preheater, i.e., the four-stage preheater 15, is connected to the heater of the first effect body, i.e., the stage I heater 1.
Each preheater uses the steam (generally used as secondary steam evaporated from the material) of the heater of the effect body as a heat source, the heating steam temperature of each preheater is the same as that of the heater of the effect body, the preheaters heat the material, and each preheater raises the material temperature a little until the material temperature of the last preheater (i.e. the four-stage preheater 15) is close to the material temperature in the first heater (i.e. the I-stage heater 1). The multi-stage preheater generally uses secondary steam evaporated from the material, and the purpose of using the multi-stage preheater is to further reduce the fresh steam consumption of the whole plant. In addition, when the multi-stage preheater is not configured, the multi-effect evaporator can be normally used, and only the consumption of fresh steam can be greatly increased.
Further, as shown in fig. 1, in the embodiment of the five-effect evaporative crystallizer, a flash tank 16 is further provided, and an outlet communicating pipe of the flash tank 16 is connected to an inlet of the primary preheater 12.
Referring to fig. 1 again, in the embodiment of the five-effect evaporative crystallizer, a secondary steam outlet is arranged at an outlet of the V-effect crystallization chamber 10 of the last effect (i.e. V-effect) body and is connected with an inlet of a condenser 18, an outlet of the condenser 18 is connected with an inlet of a condensate water tank 17, and condensate water after heat exchange of a heating heat source is collected to the condensate water tank 17. Further, the outlet of the flash tank 16 is also provided with a secondary steam outlet, which is connected to the secondary steam outlet of the V-effect crystallization chamber 10 via a communication pipe, and then connected to the inlet of the condenser 18, condensed by the condenser 18, and discharged into the condensed water tank 17. The condensate water tank 17 can be provided with two inlets, one inlet is connected with a condensate water outlet of the condenser 18, the other inlet is connected with a condensate water outlet of the V-effect heater 9 of the last effect (namely V-effect) body, an outlet of the condensate water tank 17 is connected with an inlet of a condensate water pump, and condensate water after heat exchange of a heating heat source in the multi-effect evaporation crystallizer is collected to the condensate water tank 17 and then discharged by the condensate water pump.
Fig. 8 to 12 are schematic diagrams illustrating five condensing manners of the multi-effect evaporative crystallizer of the present invention, wherein;
fig. 8 shows a three-stage shell-and-tube condenser, i.e. three shell-and-tube indirect condensers are used: a first stage condenser 20, a second stage condenser 21, and a third stage condenser 22. Wherein, the first stage condenser 20 is connected to the secondary steam outlet of the flash tank 16, the inlets of the second stage condenser 21 and the third stage condenser 22 are both connected to the secondary steam outlet of the crystallization chamber of the final effect body, and the outlets of the second stage condenser 21 and the third stage condenser 22 are both connected to the condensed water tank 17.
Fig. 9 shows a two-stage shell and tube condenser, i.e. two shell and tube indirect condensers are used: a second-stage condenser 21 and a third-stage condenser 22. Inlets of the second-stage condenser 21 and the third-stage condenser 22 are connected to a secondary steam outlet of the final-effect body crystallization chamber, and outlets of the second-stage condenser 21 and the third-stage condenser 22 are connected to the condensed water tank 17.
Fig. 10 shows a primary shell and tube condenser, i.e. a shell and tube indirect condenser: and a third stage condenser 22. The inlet of the third stage condenser 22 is connected to the final effect crystallization chamber and the vapor outlet of the flash tank 16, and the outlet of the third stage condenser 22 is connected to the condensate water tank 17.
Fig. 11 shows a two-stage hybrid condenser, i.e. two hybrid direct condensers are used: a first-stage mixing condenser 23 and a second-stage mixing condenser 24. The primary mixing condenser 23 is connected to the secondary vapor outlet of the crystallization chamber of the final effect body, and the secondary mixing condenser 24 is connected to the secondary vapor outlet of the flash tank 16.
Fig. 12 shows a first stage hybrid condenser, i.e. a hybrid direct condenser: a first-stage mixing condenser 23. The first-stage mixing condenser 23 is connected to the crystallization chamber of the final effect and to the secondary steam outlet of the flash tank 16.
Further referring to fig. 13 and 14, there are shown schematic diagrams of two heating modes of the heater of the multi-effect evaporative crystallizer of the present invention, wherein:
fig. 13 shows a dual heater heating mode, each effect contains one or two heaters A, B connected in series, and the two heaters A, B are connected in series to form a two-stage heater for heating the material in the effect.
Fig. 14 shows a single heater heating mode, each effect body comprises a heater A, and materials of the effect are heated.
Due to the adoption of the technical scheme, the multiple-effect evaporation concentration crystallization technology for viscose acid bath concentration crystallization can effectively guarantee the applicability of the multiple-effect evaporation concentration crystallization adopted by viscose acid bath concentration crystallization, can effectively guarantee the complete recycling of evaporated water, the complete crystallization recycling of sodium sulfate and the complete recycling of concentrated viscose acid bath, and simultaneously guarantees the full utilization of heat energy by adopting the multiple-effect evaporation technology.
The parts not involved in the present invention are the same as or can be implemented by the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (14)
1. A multi-effect evaporation crystallizer suitable for viscose fiber acid bath concentration crystallization is characterized in that: the device comprises a plurality of effect bodies which are connected in series step by step, wherein the plurality of effect bodies comprise a plurality of evaporation concentration effect bodies and at least one crystallization effect body, the evaporation concentration effect bodies and the crystallization effect body are respectively provided with a steam inlet and a steam outlet, and the steam inlet between the adjacent evaporation concentration effect bodies or between the adjacent evaporation concentration effect bodies and the crystallization effect bodies is correspondingly connected with the steam outlet; each evaporation and concentration effect body comprises a first heater and a separation chamber connected with the first heater, and the crystallization effect body comprises a second heater and a crystallization chamber connected with the second heater.
2. The multi-effect evaporative crystallizer of claim 1, adapted for acid bath concentration crystallization of viscose fibers, characterized by: the first heater and the second heater are made of metal materials.
3. The multi-effect evaporative crystallizer of claim 1, adapted for acid bath concentration crystallization of viscose fibers, characterized by: the number of the crystallization effect bodies is one, and the crystallization effect bodies are positioned at the second or the next final effect body in a plurality of effect bodies.
4. The multi-effect evaporative crystallizer of claim 3, adapted for acid bath concentration crystallization of viscose fibers, characterized by: the crystallization effect body is provided with a discharge hole for discharging the concentrated acid bath and the magma crystallized by the sodium sulfate.
5. The multi-effect evaporative crystallizer of claim 1, adapted for acid bath concentration crystallization of viscose fibers, characterized by: the device also comprises a steam booster pump connected with at least one steam outlet of the separation chamber or the crystallization chamber, the first stage effect body is an evaporation concentration effect body, and the outlet of the steam booster pump is connected with the steam inlet of the first heater in the first stage effect body.
6. The multi-effect evaporative crystallizer of claim 5, wherein: the number of the evaporation concentration effect bodies is not less than three, the evaporation concentration effect bodies are a plurality of the first three effect bodies in the effect bodies are the evaporation concentration effect bodies, and the inlet of the steam booster pump is connected with the steam outlet of any separating chamber in the evaporation concentration effect bodies.
7. The multi-effect evaporative crystallizer of claim 1, adapted for acid bath concentration crystallization of viscose fibers, characterized by: the first stage effect body is an evaporation and concentration effect body, and the first heater of the first stage effect body is provided with the steam inlet which is connected with an output pipeline of fresh steam during use.
8. The multi-effect evaporative crystallizer of claim 1, adapted for acid bath concentration crystallization of viscose fibers, characterized by: the first heater or the second heater of the second final effect body is provided with a condensed water outlet which is connected with a condensed water tank; and a secondary steam outlet is arranged in the separation chamber or the crystallization chamber of the second final effect body and is connected with a condenser.
9. The multi-effect evaporative crystallizer of claim 8, wherein: the condenser adopts a shell and tube condenser or a mixed condenser or a combination of the shell and tube condenser and the mixed condenser.
10. The multi-effect evaporative crystallizer of claim 8, wherein: the condensed water tank is provided with two inlets, one is connected with the condensed water outlet of the first heater or the second heater of the final effect body, the other is connected with the condensed water outlet of the condenser, and the outlet of the condensed water tank is connected with the inlet of the condensed water pump.
11. The multi-effect evaporative crystallizer of claim 1, adapted for acid bath concentration crystallization of viscose fibers, characterized by: and each evaporation and concentration effect body comprises one or two first heaters connected in series, and each crystallization effect body comprises one or two second heaters connected in series.
12. The multi-effect evaporative crystallizer of claim 1, adapted for acid bath concentration crystallization of viscose fibers, characterized by: the system also comprises at least one preheater which is connected with at least one first heater or second heater through a steam pipeline.
13. The multi-effect evaporative crystallizer of claim 12, adapted for acid bath concentration crystallization of viscose fibers, characterized by: the quantity of pre-heater is a plurality of, and the effect body all is provided with one at different levels except that the second final stage is imitated the pre-heater, and is a plurality of establish ties step by step between the pre-heater, the second final stage the pre-heater is connected in the first stage and is imitated the body, the first stage the pre-heater is connected in the end body of time.
14. The multi-effect evaporative crystallizer of claim 13, adapted for acid bath concentration crystallization of viscose fibers, characterized by: the system also comprises a flash tank which is connected with the first-stage preheater.
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| CN113476874A (en) * | 2021-07-29 | 2021-10-08 | 上海神农节能环保科技股份有限公司 | Multiple-effect evaporation crystallizer suitable for viscose fiber acid bath concentration crystallization |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113476874A (en) * | 2021-07-29 | 2021-10-08 | 上海神农节能环保科技股份有限公司 | Multiple-effect evaporation crystallizer suitable for viscose fiber acid bath concentration crystallization |
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