CN113521777A - High-efficiency energy-saving triple-effect forced circulation evaporation system - Google Patents
High-efficiency energy-saving triple-effect forced circulation evaporation system Download PDFInfo
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- CN113521777A CN113521777A CN202110907295.0A CN202110907295A CN113521777A CN 113521777 A CN113521777 A CN 113521777A CN 202110907295 A CN202110907295 A CN 202110907295A CN 113521777 A CN113521777 A CN 113521777A
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- 238000001704 evaporation Methods 0.000 title claims abstract description 255
- 230000008020 evaporation Effects 0.000 title claims abstract description 255
- 239000007788 liquid Substances 0.000 claims abstract description 58
- 239000002562 thickening agent Substances 0.000 claims abstract description 31
- 239000002994 raw material Substances 0.000 claims abstract description 28
- 230000000694 effects Effects 0.000 claims abstract description 19
- 238000002425 crystallisation Methods 0.000 claims abstract description 16
- 230000008025 crystallization Effects 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 52
- 239000005416 organic matter Substances 0.000 claims description 26
- 238000007599 discharging Methods 0.000 claims description 25
- 239000012452 mother liquor Substances 0.000 claims description 25
- 239000006260 foam Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 12
- 239000012141 concentrate Substances 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 8
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- 230000009291 secondary effect Effects 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 4
- 239000006228 supernatant Substances 0.000 claims description 4
- 239000000706 filtrate Substances 0.000 claims description 3
- 239000007791 liquid phase Substances 0.000 claims description 3
- 239000012071 phase Substances 0.000 claims description 3
- 230000009290 primary effect Effects 0.000 claims description 3
- 238000007701 flash-distillation Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims 4
- 230000005494 condensation Effects 0.000 claims 4
- 238000010992 reflux Methods 0.000 claims 1
- 238000009834 vaporization Methods 0.000 claims 1
- 230000008016 vaporization Effects 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 24
- 238000000034 method Methods 0.000 description 10
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
- B01D1/305—Demister (vapour-liquid separation)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/06—Flash distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/10—Vacuum distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0059—General arrangements of crystallisation plant, e.g. flow sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D2009/0086—Processes or apparatus therefor
Abstract
The invention discloses a high-efficiency energy-saving triple-effect forced circulation evaporation system, and belongs to the field of evaporation systems. The triple-effect forced circulation evaporation system of the invention firstly utilizes the circulation flash evaporation device to carry out flash evaporation treatment on the raw material liquid to separate out organic matters in the raw material liquid, then carries out triple-effect forced circulation evaporation on the raw material liquid, utilizes secondary steam of the front effect separator as a heat source of the rear effect heater, saves steam consumption, leads the raw material liquid to be concentrated to a set concentration, then utilizes the crystallization device to crystallize the concentrated liquid, utilizes a group of thickener and centrifuge to realize continuous centrifugal operation of the centrifuge through the optimized design of the crystallization device, uses less equipment to complete more raw material liquid treatment, leads the equipment in the whole system to be more simplified, reduces the equipment input cost, has the raw material liquid treatment capacity of 9000kg/h in unit time, greatly improves the working efficiency of the triple-effect forced circulation evaporation system, and effectively reduces the system operation energy consumption, can effectively save energy by 30 percent.
Description
Technical Field
The invention relates to an evaporation system, in particular to a high-efficiency energy-saving triple-effect forced circulation evaporation system.
Background
In the processes of medicine, chemical industry, petrochemical industry, food and daily chemical production and industrial wastewater recycling, evaporation is an important process, and as an important component in the production process, the evaporation is widely applied to food, petroleum, chemical industry and other related industries. However, the overall technical level of the technologies and equipment in China, such as medicine, chemical engineering, petrifaction and the like, is still different from that of foreign countries, the technologies are basically introduced and imitated to the foreign countries, and the manufacturing technology of the intelligent, efficient and energy-saving evaporation equipment is not comprehensively mastered.
The materials (such as industrial wastewater) subjected to evaporation treatment usually contain various volatile organic matters, evaporated and vaporized solvents (water), inorganic salts and other solutes, the organic matters, the inorganic salts and other substances are separated out by heating in the evaporation process, the organic matters are condensed and liquefied for recovery, and the inorganic salts are crystallized for recovery. In industrial production, steam heating is adopted in the evaporation process, the consumption of steam needs to be taken into account in the production cost, and the evaporation is an energy loss process, so that the energy saving problem in the evaporation process is an important factor which needs to be considered in the design process. In order to fully utilize steam heat energy, multi-effect evaporation is mostly adopted to improve the heat utilization rate at present, and the more evaporators connected in series in a multi-effect evaporation system, the less the unit steam consumption. With the rapid development of the multi-effect evaporation technology, the multi-effect evaporation system is applied more and more in industrial production, the technology is mature more and more, and the production efficiency is greatly improved.
However, the evaporation production efficiency and the steam consumption of domestic triple-effect circulation evaporation systems are still not ideal at present, and the problems of low treatment efficiency, high steam consumption and the like generally exist, the main reason is that the process design of the triple-effect circulation evaporation systems is not optimized, the coordination cooperativity of all the systems in the process is poor, more equipment is often needed to finish the same process flow, the material and steam flow stroke is greatly increased, the steam consumption is increased, the material treatment capacity in unit time is reduced, and the equipment investment cost is increased.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects of complicated equipment arrangement, high input cost, long material and steam flow stroke, large steam consumption, lower working efficiency and the like of the conventional triple-effect circulation evaporation system, and provides a high-efficiency energy-saving triple-effect forced circulation evaporation system. The equipment in the whole system is simplified, the equipment investment cost is reduced, the treatment capacity of the raw material liquid in unit time can reach 9000kg/h, the working efficiency of the triple-effect circulating evaporation system is greatly improved, the system operation energy consumption is effectively reduced, and the energy can be effectively saved by 30%.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the invention relates to a high-efficiency energy-saving triple-effect forced circulation evaporation system, which comprises a flash evaporation device, a triple-effect evaporation concentration device, a crystallization device and a vacuum negative pressure device, wherein:
the flash evaporation device comprises a flash evaporation tank, a flash evaporation heater, a flash evaporation condenser and an organic matter receiving tank, raw material liquid is pumped into a steam condensate water preheater through a feeding pump to enter the flash evaporation heater after being preheated, a discharge port of the flash evaporation heater is connected with a material feeding port of the flash evaporation tank, a liquid phase discharge port of the flash evaporation tank is connected to a feeding port of the flash evaporation heater through a flash evaporation circulating pump to form a circulating flash evaporation unit, a gas phase discharge port of the flash evaporation tank is connected with a feeding port of the flash evaporation condenser, and a discharge port of the flash evaporation condenser is connected with the organic matter receiving tank;
the triple-effect evaporation concentration device comprises a first-effect evaporation concentration unit, a second-effect evaporation concentration unit and a triple-effect evaporation concentration unit, wherein the first-effect evaporation concentration unit, the second-effect evaporation concentration unit and the triple-effect evaporation concentration unit respectively comprise a separator, a forced circulation pump and a heater, a discharge port of the flash circulation pump is connected to the first-effect evaporation concentration unit through a control valve and used for conveying materials in the flash device to the first-effect evaporation concentration unit, a discharge port of the forced circulation pump in the first-effect evaporation concentration unit is connected to the second-effect evaporation concentration unit through the control valve and used for pumping concentrated liquid reaching a set concentration in the first-effect evaporation concentration unit into the second-effect evaporation concentration unit, a discharge port of the forced circulation pump in the second-effect evaporation concentration unit is connected to the triple-effect evaporation concentration unit through the control valve and used for pumping concentrated liquid reaching the set concentration in the second-effect evaporation concentration unit into the triple-effect evaporation concentration unit, a concentrated solution discharge port of a separator in the triple-effect evaporation concentration unit is pumped into a crystallization device through a concentrated solution discharge pump;
the steam inlets of the heaters in the flash evaporation heater and the first-effect evaporation concentration unit are respectively connected with an external steam generation system, the steam outlets of the heaters in the flash evaporation heater and the first-effect evaporation concentration unit are respectively connected with a steam condensate water tank, and the water outlet of the steam condensate water tank is connected to a steam condensate water preheater through a steam condensate water pump to serve as a raw material liquid preheating heat source; a secondary steam outlet of a separator in the primary-effect evaporation concentration unit is connected to a heater in the secondary-effect evaporation concentration unit to be used as a heat source of the secondary-effect evaporation concentration unit; a secondary steam outlet of a separator in the two-effect evaporation concentration unit is connected to a heater in the three-effect evaporation concentration unit to serve as a heat source of the three-effect evaporation concentration unit, and condensed water outlets of the heater in the two-effect evaporation concentration unit and the heater in the three-effect evaporation concentration unit are respectively connected to a condensed water tank; a secondary steam outlet of a separator in the triple-effect evaporation concentration unit is connected to a condensed water tank through a condenser, and a water outlet of the condensed water tank is discharged outside through a condensed water pump;
the vacuum negative pressure device comprises a vacuum pump and a vacuum pump working liquid tank, the vacuum pump is connected with the vacuum pump working liquid tank, non-condensable gas outlets of the heaters in the organic matter receiving tank, the flash evaporation heater and the triple-effect evaporation concentration device are respectively connected to a condenser, and the non-condensable gas outlet of the condenser is connected with the vacuum pump;
the crystallization device comprises a thickener, a mother liquor tank and a centrifugal machine, wherein a concentrated liquor discharge port of a separator in the triple-effect evaporation concentration unit is connected with a feed port of the thickener through a concentrated liquor discharge pump, a lower discharge port of the thickener is respectively connected with the mother liquor tank and the centrifugal machine through valves, a filtrate outlet of the centrifugal machine is connected to the mother liquor tank, and a liquor outlet of the mother liquor tank is respectively connected into the triple-effect evaporation concentration unit of the thickener and the triple-effect evaporation concentration unit through the mother liquor pump and the valves.
Furthermore, a cyclone is arranged in front of the feeding hole of the thickener, a concentrated solution discharging hole of a separator in the triple-effect evaporation concentration unit is connected with the feeding hole of the cyclone through a concentrated solution discharging pump, the concentrated solution discharging hole of the cyclone is connected with the feeding hole of the thickener, and a supernatant discharging hole of the cyclone and an overflow hole of the thickener are respectively connected to the mother solution tank.
Furthermore, the single-effect evaporation concentration unit comprises a single-effect separator, a single-effect heater and a single-effect forced circulation pump, wherein a concentrated solution discharge port of the single-effect separator is connected with a feed port of the single-effect forced circulation pump, a discharge port of the single-effect forced circulation pump is connected with a feed port of the single-effect heater, and a discharge port of the single-effect heater is connected with a feed port of the single-effect separator;
the two-effect evaporation and concentration unit comprises a two-effect separator, a two-effect heater and a two-effect forced circulation pump, wherein a concentrated solution discharge port of the two-effect separator is connected with a feed port of the two-effect forced circulation pump, a discharge port of the two-effect forced circulation pump is connected with a feed port of the two-effect heater, and a discharge port of the two-effect heater is connected with a feed port of the two-effect separator;
the triple-effect evaporation concentration unit comprises a triple-effect separator, a triple-effect heater and a triple-effect forced circulation pump, wherein a discharge port in the middle of the triple-effect separator is connected with a feed port of the triple-effect forced circulation pump, a discharge port of the triple-effect forced circulation pump is connected with a feed port of the triple-effect heater, a discharge port of the triple-effect heater is connected with a feed port of the triple-effect separator, and a discharge port of a concentrated solution at the lower part of the triple-effect separator is connected with a feed port of a concentrated solution discharge pump.
Furthermore, the secondary steam exit department of an effect separator, two effect separators and three effect separators all be equipped with except that foam mechanism, should remove foam mechanism and include backward flow cover, steam discharging pipe and baffle, backward flow cover invert the sealed top of locating the separator main part, the lateral wall of backward flow cover on be equipped with the secondary steam export, the steam discharging pipe locate the inside of backward flow cover, and the lower mouth of pipe of steam discharging pipe is linked together with the open-top of separator main part, the last mouth of pipe of steam discharging pipe be the scarf, and the direction and the secondary steam export opposite direction of this scarf, the baffle pass through the support and be fixed in the open-top below of separator main part.
Furthermore, the pipelines of the flash evaporation circulating pump, the forced circulating pumps in the triple-effect evaporation concentration device and the mother liquid pump are respectively connected with a sewage discharge pipe through valves.
Furthermore, the top parts of the first-effect separator, the second-effect separator, the third-effect separator and the flash tank are respectively provided with a cleaning spray header, and the cleaning spray headers of the first-effect separator, the second-effect separator, the third-effect separator and the flash tank are respectively connected with a cleaning water system.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) the invention relates to a high-efficiency energy-saving triple-effect forced circulation evaporation system, which comprises a flash evaporation device, a triple-effect evaporation concentration device, a crystallization device and a vacuum negative pressure device, wherein the flash evaporation device is used for flash evaporation treatment of raw material liquid to separate organic matters in the raw material liquid, then the triple-effect forced circulation evaporation is carried out on the raw material liquid, secondary steam of a front-effect separator is used as a heat source of a rear-effect heater, the steam consumption is saved, the raw material liquid can be concentrated to a set concentration, then the crystallization device is used for crystallizing the concentrated liquid, through the optimized design of the crystallization device, a group of thickener and centrifuge can be used for realizing continuous centrifugal operation of the centrifuge, less equipment is used for completing more raw material liquid treatment, the equipment in the whole system is simplified, the equipment investment cost is reduced, and the raw material liquid treatment capacity in unit time can reach 9000kg/h, the working efficiency of the triple-effect circulating evaporation system is greatly improved, the energy consumption of the system in operation is effectively reduced, and the energy can be effectively saved by 30%;
(2) the invention relates to a high-efficiency energy-saving triple-effect forced circulation evaporation system, wherein a swirler is arranged in front of a feeding hole of a thickener, a concentrated solution discharging hole of a separator in a triple-effect evaporation concentration unit is connected with the feeding hole of the swirler through a concentrated solution discharging pump, a concentrated solution discharging hole of the swirler is connected with the feeding hole of the thickener, a supernatant discharging hole of the swirler and an overflow hole of the thickener are respectively connected to a mother liquor tank, the concentrated solution in the thickener can overflow into the mother liquor tank, meanwhile, the solution in the mother liquor tank can also be returned to the thickener or the triple-effect evaporation concentration unit through the mother liquor pump, therefore, the solution output rate can be adjusted according to the operation of the system, so that the centrifugal machine can continuously and stably operate, the crystal salt separation of the three-effect forced circulation evaporation system is met by fewer centrifugal machines, and the three-effect forced circulation evaporation system can operate more safely and efficiently;
(3) according to the high-efficiency energy-saving triple-effect forced circulation evaporation system, the secondary steam outlets of the primary separator, the secondary separator and the triple-effect separator are respectively provided with the foam removing mechanism, the foam removing mechanism comprises the backflow cover, the steam discharging pipe and the baffle plate, the baffle plate is used for blocking foam, and meanwhile, the backflow cover and the steam discharging pipe are used for enabling secondary steam of the separator to generate back-turning flow, so that the foam is effectively prevented from being brought out by the secondary steam, condensed water of the secondary steam is cleaner and meets the emission standard;
(4) according to the high-efficiency energy-saving triple-effect forced circulation evaporation system, the flash evaporation circulating pump, the forced circulating pumps in the triple-effect evaporation concentration device and the pipelines of the mother liquid pump are respectively connected with the sewage discharge pipe through the valves, and the sewage discharge of the system can be realized by utilizing the discharge valve at the lowest point of the system, so that the whole system is safer and more stable in operation;
(5) according to the high-efficiency energy-saving triple-effect forced circulation evaporation system, the cleaning spray heads are arranged at the tops of the primary-effect separator, the secondary-effect separator, the triple-effect separator and the flash tank respectively, and are connected with a cleaning water system respectively, and the system can be cleaned and maintained in time by matching with a blow-off pipe design, so that the service life of the whole evaporation system is prolonged.
Drawings
FIG. 1 is a process flow diagram of a high efficiency energy saving triple effect forced circulation evaporation system of the present invention;
FIG. 2 is a schematic diagram of a crystallization device in a high-efficiency energy-saving triple-effect forced circulation evaporation system according to the present invention;
fig. 3 is a schematic structural diagram of a defoaming mechanism of a separator in a high-efficiency energy-saving triple-effect forced circulation evaporation system according to the invention.
The reference numerals in the schematic drawings illustrate:
p01, feed pump; p02, one-effect forced circulation pump; p03, two-effect forced circulation pump; p04, three-effect forced circulation pump; p05, a steam condensate pump; p06, a concentrated solution discharge pump; p07, a condensate pump; p08, vacuum pump; p09, mother liquor pump; p10, flash circulation pump; p11, a first organic matter discharge pump; p12, a second organic matter discharge pump;
e01, a one-effect heater; e02, dual effect heater; e03, triple effect heater; e04, a condenser; e05, a steam condensate water preheater; e06, flash heaters; e07, flash condenser;
s01, a one-effect separator; s02, a two-effect separator; s03, a three-effect separator; s04, a flash tank;
v01, steam condensate tank; v02, a condensate water tank; v03, thickener; v04, mother liquor tank; V05A, first organic matter receiving tank; V05B, second organic matter receiving tank; v07, a vacuum pump working liquid tank; m01, centrifuge; x01, cyclone;
100. a separator body; 101. a reflow hood; 102. a steam discharging pipe; 103. an upper pipe orifice; 104. a baffle plate; 105. a support; 106. and (5) a secondary steam outlet.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.
[ examples ]
With reference to fig. 1, the high-efficiency energy-saving triple-effect forced circulation evaporation system of the present embodiment includes a flash evaporation device, a triple-effect evaporation concentration device, a crystallization device and a vacuum negative pressure device, wherein:
the flash evaporation device comprises a flash evaporation tank S04, a flash evaporation heater E06, a flash evaporation condenser E07 and an organic matter receiving tank, raw material liquid is pumped into a steam condensate water preheater E05 through a feed pump P01 and enters the flash evaporation heater E06 after being preheated, the raw material liquid can go through a tube pass of the steam condensate water preheater E05, a discharge port of the flash evaporation heater E06 is connected with a material feed port of the flash evaporation tank S04, a liquid phase discharge port of the flash evaporation tank S04 is connected to a feed port of the flash evaporation heater E06 through a flash evaporation circulating pump P10 to form a circulating flash evaporation unit, a gas phase discharge port of the flash evaporation tank S04 is connected with a feed port of the flash evaporation condenser E07, and a discharge port of the flash evaporation condenser E07 is connected with the organic matter receiving tank. The raw material liquid is preheated by a steam condensate water preheater E05 and then enters a flash evaporation heater E06 for heating, organic matters are flash-separated in a flash evaporation tank S04, organic matter gas is condensed and liquefied in a flash evaporation condenser E07, and the liquefied organic matter gas enters an organic matter receiving tank for collection. In order to guarantee the system vacuum degree, the organic matter receiving tank comprises a first organic matter receiving tank V05A and a second organic matter receiving tank V05B, the discharge port of a flash evaporation condenser E07 is connected with the feed inlet of the second organic matter receiving tank V05B, the discharge port of the second organic matter receiving tank V05B is connected to the feed inlet of the first organic matter receiving tank V05A through a first organic matter discharge pump P11, the discharge port of the first organic matter receiving tank V05A is discharged through a second organic matter discharge pump P12, the separation of organic matters in raw material liquid is realized, meanwhile, the vacuum degree of the whole system can be guaranteed by arranging two groups of organic matter receiving tanks.
The triple-effect evaporation concentration device comprises a single-effect evaporation concentration unit, a double-effect evaporation concentration unit and a triple-effect evaporation concentration unit, wherein the single-effect evaporation concentration unit, the double-effect evaporation concentration unit and the triple-effect evaporation concentration unit respectively comprise a separator, a forced circulation pump and a heater, and the forced circulation pump circulates concentrated solution in the separator and the heater to gradually increase the concentration of the solution; the discharge gate of flash evaporation circulating pump P10 is connected to one and imitates the evaporation concentration unit through the control valve, a material flow for carrying the material among the flash distillation plant to one imitates the evaporation concentration unit, the discharge gate of the force circulating pump among the one imitates the evaporation concentration unit is connected to two-effect evaporation concentration unit through the control valve, a concentrate that reaches the set concentration among the one imitates the evaporation concentration unit is squeezed into two-effect evaporation concentration unit, the discharge gate of the force circulating pump among the two-effect evaporation concentration unit is connected to three-effect evaporation concentration unit through the control valve, a concentrate that reaches the set concentration among the two-effect evaporation concentration unit is squeezed into three-effect evaporation concentration unit, the concentrate discharge gate of the separator among the three-effect evaporation concentration unit is squeezed into crystallization device through concentrate discharge pump P06, the above material flow that constitutes three-effect evaporation concentration device. The steam flow of the triple-effect evaporation and concentration device is as follows: the steam inlets of the heaters in the flash evaporation heater E06 and the first-effect evaporation concentration unit are respectively connected with an external raw steam system, the steam outlets of the heaters in the flash evaporation heater E06 and the first-effect evaporation concentration unit are respectively connected with a steam condensate water tank V01, the water outlet of the steam condensate water tank V01 is connected to a steam condensate water preheater E05 through a steam condensate water pump P05 to serve as a raw material liquid preheating heat source, and condensate water in the steam condensate water tank V01 flows away from the shell pass of the steam condensate water preheater E05. A secondary steam outlet of a separator in the first-effect evaporation concentration unit is connected to a heater in the second-effect evaporation concentration unit to be used as a heat source of the second-effect evaporation concentration unit; a secondary steam outlet of the separator in the two-effect evaporation concentration unit is connected to a heater in the three-effect evaporation concentration unit to be used as a heat source of the three-effect evaporation concentration unit, and condensed water outlets of the heater in the two-effect evaporation concentration unit and the heater in the three-effect evaporation concentration unit are respectively connected to a condensed water tank V02; the secondary steam outlet of the separator in the triple-effect evaporation concentration unit is connected to a condensed water tank V02 through a condenser E04, and the water outlet of the condensed water tank V02 is discharged outside through a condensed water pump P07.
Specifically, the single-effect evaporation and concentration unit comprises a single-effect separator S01, a single-effect heater E01 and a single-effect forced circulation pump P02, wherein a concentrated solution outlet of the single-effect separator S01 is connected with a feed inlet of the single-effect forced circulation pump P02, a feed outlet of the single-effect forced circulation pump P02 is connected with a feed inlet of the single-effect heater E01, and a feed outlet of the single-effect heater E01 is connected with a feed inlet of the single-effect separator S01; the two-effect evaporation concentration unit comprises a two-effect separator S02, a two-effect heater E02 and a two-effect forced circulation pump P03, a concentrated solution discharge port of the two-effect separator S02 is connected with a feed port of the two-effect forced circulation pump P03, a discharge port of the two-effect forced circulation pump P03 is connected with a feed port of the two-effect heater E02, a discharge port of the two-effect heater E02 is connected with a feed port of the two-effect separator S02, and a secondary steam outlet of the one-effect separator S01 is connected with a steam inlet of the two-effect heater E02; the triple-effect evaporation and concentration unit comprises a triple-effect separator S03, a triple-effect heater E03 and a triple-effect forced circulation pump P04, a discharge port in the middle of the triple-effect separator S03 is connected with a feed port of the triple-effect forced circulation pump P04, a discharge port of the triple-effect forced circulation pump P04 is connected with a feed port of the triple-effect heater E03, a discharge port of the triple-effect heater E03 is connected with a feed port of the triple-effect separator S03, a discharge port of concentrated liquid at the lower part of the triple-effect separator S03 is connected with a feed port of the concentrated liquid discharge pump P06, a secondary steam inlet of the double-effect separator S02 is connected with a steam inlet of the triple-effect heater E03, and condensate water outlets of the double-effect heater E02 and the triple-effect heater E03 are connected with a condensate water tank V02.
The vacuum negative pressure device comprises a vacuum pump P08 and a vacuum pump working liquid tank V07, the vacuum pump P08 is connected with the vacuum pump working liquid tank V07, a vacuum liquid cooler is further arranged between the vacuum pump P08 and the vacuum pump working liquid tank V07, an organic matter receiving tank, a flash evaporation heater E06 and a non-condensable gas outlet of each effect heater in the three-effect evaporation concentration device are respectively connected to a condenser E04, a non-condensable gas outlet of a condenser E04 is connected with the vacuum pump P08, the vacuum pump P08 is utilized to realize flash evaporation and three-effect evaporation concentration in a vacuum state, and evaporation is more efficient, safe and reliable.
The crystallizing device comprises a thickener V03, a mother liquor tank V04 and a centrifuge M01, wherein a concentrated liquor discharge port of a separator in the triple-effect evaporation concentration unit is connected with a feed inlet of the thickener V03 through a concentrated liquor discharge pump P06, a lower discharge port of the thickener V03 is respectively connected with the mother liquor tank V04 and the centrifuge M01 through valves, a filtrate outlet of the centrifuge M01 is connected with the mother liquor tank V04, and crystal salt is output to the outside after a solid phase of the centrifuge M01 is output; the liquid outlet of the mother liquid tank V04 is respectively connected to the thickener V03 and the triple-effect evaporation concentration unit of the triple-effect evaporation concentration device through a mother liquid pump P09 and a valve, the mother liquid pump P09 can be utilized to enable the concentrated liquid to circulate between the mother liquid pump P09 and the thickener V03, the mother liquid can be pumped back to the evaporation system to participate in evaporation concentration again, continuous circulation evaporation is realized, and three wastes are not discharged. Meanwhile, by adopting the crystallization device, continuous centrifugal operation of the centrifugal machine can be realized by utilizing a group of thickeners V03 and the centrifugal machine M01, and more raw material liquid is processed by using less equipment, so that the equipment in the whole system is simplified, and the equipment investment cost is reduced.
As shown in figure 1, the pipelines of the flash evaporation circulating pump P10, the forced circulating pumps in the triple-effect evaporation concentration device and the mother liquor pump P09 are respectively connected with a sewage discharge pipe through valves, and the sewage discharge of the system can be realized by utilizing a discharge valve at the lowest point of the system, so that the whole system is safer and more stable to operate. The top of first-effect separator S01, two-effect separator S02, three-effect separator S03 and flash tank S04 all is equipped with the washing shower head, and the washing shower head of first-effect separator S01, two-effect separator S02, three-effect separator S03 and flash tank S04 is connected with washing water system respectively, cooperates with above-mentioned blow off pipe design, can in time wash the maintenance to the system, has improved whole evaporation system' S life.
Further, as shown in fig. 2, in this embodiment, a cyclone X01 is further disposed before the feed inlet of the thickener V03, the concentrate discharge port of the separator in the triple effect evaporation concentration unit is connected to the feed inlet of the cyclone X01 through a concentrate discharge pump P06, the concentrate discharge port of the cyclone X01 is connected to the feed inlet of the thickener V03, and the supernatant discharge port of the cyclone X01 and the overflow port of the upper portion of the thickener V03 are respectively connected to the mother liquid tank V04. The concentrated solution in the thickener V03 can overflow into the mother liquor tank V04, and simultaneously the solution in the mother liquor tank V04 can also return to the thickener V03 or triple effect evaporation concentration unit through the mother liquor pump P09, so the solution output rate can be adjusted according to the system operation, the centrifuge M01 can operate continuously and stably, the crystal salt separation of the triple effect forced circulation evaporation system is satisfied by fewer centrifuges, and the triple effect forced circulation evaporation system operates more safely and efficiently.
As shown in fig. 3, in the present embodiment, the secondary steam outlets of the first-effect separator S01, the second-effect separator S02, and the third-effect separator S03 are all provided with a defoaming mechanism, the defoaming mechanism includes a backflow cover 101, a steam discharging pipe 102, and a baffle plate 104, the backflow cover 101 is disposed at the top of the separator body 100 in an inverted sealing manner, a secondary steam outlet 106 is disposed on a side wall of the backflow cover 101, the steam discharging pipe 102 is disposed inside the backflow cover 101, a lower nozzle of the steam discharging pipe 102 is communicated with the top opening of the separator body 100, an upper nozzle 103 of the steam discharging pipe 102 is a chamfered opening, a direction of the chamfered opening is opposite to a direction of the secondary steam outlet 106, and the baffle plate 104 is fixed below the top opening of the separator body 100 through a bracket 105. Adopt above-mentioned defoaming mechanism, when the separator during operation, secondary steam blocks through baffle 104, makes most foam in the steam blocked, and steam upwards flows by steam discharging pipe 102 through the space that support 105 formed, flows through last mouth of pipe 103 to flowing back cover 101 inner wall, utilizes the striking of steam and the inside wall of backward flow cover 101 to make the foam in the gas further get rid of this moment, and later steam flows from secondary steam export 106 after turning back downwards, makes the foam in the steam effectively get rid of. Foretell foam removing mechanism utilizes baffle 104 to block the foam, utilizes backward flow cover 101 and steam discharging pipe 102 to make the secondary steam production of separator to turn back simultaneously and flows, has effectively avoided secondary steam to take out the foam, makes secondary steam's comdenstion water cleaner, satisfies emission standard to this foam removing mechanism's structural design is simple, the preparation of being convenient for, and it is better to remove the foam effect.
The high-efficiency energy-saving triple-effect forced circulation evaporation system of the embodiment firstly utilizes the circulation flash evaporation device to carry out flash evaporation treatment on the raw material liquid, separates out organic matters in the raw material liquid, then the raw material liquid is subjected to triple-effect forced circulation evaporation, secondary steam of the front-effect separator is used as a heat source of a rear-effect heater, the steam consumption is saved, the raw material liquid can be concentrated to a set concentration, and then the concentrated liquid is crystallized by a crystallizing device, by the optimized design of the crystallization device, the continuous centrifugal operation of the centrifugal machine can be realized by utilizing a group of thickeners and centrifugal machines, more raw material liquid treatment can be completed by using less equipment, the equipment in the whole system is simplified, the equipment investment cost is reduced, the working efficiency of the triple-effect circulating evaporation system is greatly improved, the system operation energy consumption is effectively reduced, and the energy can be effectively saved by 30%. The high-efficiency energy-saving triple-effect forced circulation evaporation system has the advantages that the feeding amount reaches 9000kg/h, the evaporation amount is 6000kg/h, the discharging amount is 3000kg/h, the steam consumption is 2400kg/h, the power is 200KW, the cooling water consumption is 130m3H is used as the reference value. The core technical index exceeds the level of similar products in China, the industrialization rate of the industrial chain of high-end industries such as medicine, chemical industry, petrochemical industry and the like is improved, and the international competitiveness is improved. Meanwhile, the whole system can be automatically controlled by a PLC system, so that the full flow of the evaporation production process is intelligently and intensively controlled, and the safe, efficient and stable operation of the system is ensured.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (6)
1. The utility model provides an energy-conserving triple-effect forced circulation vaporization system of high efficiency, includes flash distillation device, triple-effect evaporation concentration device, crystallization device and vacuum negative pressure device, its characterized in that:
the flash evaporation device comprises a flash evaporation tank (S04), a flash evaporation heater (E06), a flash evaporation condenser (E07) and an organic matter receiving tank, raw material liquid is pumped into a steam condensate water preheater (E05) through a feed pump (P01) to enter the flash evaporation heater (E06) after being preheated, a discharge port of the flash evaporation heater (E06) is connected with a material feed port of the flash evaporation tank (S04), a liquid phase discharge port of the flash evaporation tank (S04) is connected to a feed port of the flash evaporation heater (E06) through a flash evaporation circulating pump (P10) to form a circulating flash evaporation unit, a gas phase discharge port of the flash evaporation tank (S04) is connected with a feed port of the flash evaporation condenser (E07), and a discharge port of the flash evaporation condenser (E07) is connected with the organic matter receiving tank;
the triple-effect evaporation concentration device comprises a single-effect evaporation concentration unit, a double-effect evaporation concentration unit and a triple-effect evaporation concentration unit, wherein the single-effect evaporation concentration unit, the double-effect evaporation concentration unit and the triple-effect evaporation concentration unit respectively comprise a separator, a forced circulation pump and a heater, a discharge port of the flash circulation pump (P10) is connected to the single-effect evaporation concentration unit through a control valve and used for conveying materials in the flash device to the single-effect evaporation concentration unit, a discharge port of the forced circulation pump in the single-effect evaporation concentration unit is connected to the double-effect evaporation concentration unit through a control valve and used for pumping concentrated liquid reaching set concentration in the single-effect evaporation concentration unit into the double-effect evaporation concentration unit, a discharge port of the forced circulation pump in the double-effect evaporation concentration unit is connected to the triple-effect evaporation concentration unit through a control valve and used for pumping concentrated liquid reaching set concentration in the double-effect evaporation concentration unit into the triple-effect evaporation concentration unit, a concentrated solution discharge port of a separator in the triple-effect evaporation concentration unit is driven into a crystallization device through a concentrated solution discharge pump (P06);
the steam inlets of the heaters in the flash evaporation heater (E06) and the first-effect evaporation concentration unit are respectively connected with an external steam generation system, the steam outlets of the heaters in the flash evaporation heater (E06) and the first-effect evaporation concentration unit are respectively connected with a steam condensation water tank (V01), and the water outlet of the steam condensation water tank (V01) is connected to a steam condensation water preheater (E05) through a steam condensation water pump (P05) to serve as a raw material liquid preheating heat source; a secondary steam outlet of a separator in the primary-effect evaporation concentration unit is connected to a heater in the secondary-effect evaporation concentration unit to be used as a heat source of the secondary-effect evaporation concentration unit; a secondary steam outlet of a separator in the two-effect evaporation concentration unit is connected to a heater in the three-effect evaporation concentration unit to be used as a heat source of the three-effect evaporation concentration unit, and condensed water outlets of the heater in the two-effect evaporation concentration unit and the heater in the three-effect evaporation concentration unit are respectively connected to a condensed water tank (V02); a secondary steam outlet of a separator in the triple-effect evaporation concentration unit is connected to a condensed water tank (V02) through a condenser (E04), and a water outlet of the condensed water tank (V02) is discharged outside through a condensed water pump (P07);
the vacuum negative pressure device comprises a vacuum pump (P08) and a vacuum pump working liquid tank (V07), the vacuum pump (P08) is connected with the vacuum pump working liquid tank (V07), non-condensable gas outlets of the organic matter receiving tank, the flash evaporation heater (E06) and each effect heater in the triple-effect evaporation concentration device are respectively connected to a condenser (E04), and the non-condensable gas outlet of the condenser (E04) is connected with the vacuum pump (P08);
the crystallization device comprises a thickener (V03), a mother liquor tank (V04) and a centrifuge (M01), wherein a concentrated liquor discharge port of a separator in the triple-effect evaporation concentration unit is connected with a feed inlet of the thickener (V03) through a concentrated liquor discharge pump (P06), a lower discharge port of the thickener (V03) is respectively connected with the mother liquor tank (V04) and the centrifuge (M01) through valves, a filtrate outlet of the centrifuge (M01) is connected to the mother liquor tank (V04), and a liquor outlet of the mother liquor tank (V04) is respectively connected to the thickener (V03) and the triple-effect evaporation concentration unit of the triple-effect evaporation concentration device through a mother liquor pump (P09) and a valve.
2. The high-efficiency energy-saving three-effect forced circulation evaporation system of claim 1, wherein: still be equipped with swirler (X01) before the feed inlet of stiff ware (V03), the concentrate discharge gate of the separator in the triple effect evaporation concentration unit be connected with the feed inlet of swirler (X01) through concentrate discharge pump (P06), the concentrate discharge gate of swirler (X01) be connected with the feed inlet of stiff ware (V03), the supernatant discharge gate of swirler (X01) and the overflow mouth of stiff ware (V03) be connected to mother liquor jar (V04) respectively.
3. A high efficiency energy saving three effect forced circulation evaporation system according to claim 1 or 2, characterized in that: the single-effect evaporation and concentration unit comprises a single-effect separator (S01), a single-effect heater (E01) and a single-effect forced circulation pump (P02), wherein a concentrated solution discharge port of the single-effect separator (S01) is connected with a feed port of the single-effect forced circulation pump (P02), a discharge port of the single-effect forced circulation pump (P02) is connected with a feed port of the single-effect heater (E01), and a discharge port of the single-effect heater (E01) is connected with a feed port of the single-effect separator (S01);
the double-effect evaporation and concentration unit comprises a double-effect separator (S02), a double-effect heater (E02) and a double-effect forced circulation pump (P03), wherein a concentrated solution discharge port of the double-effect separator (S02) is connected with a feed port of the double-effect forced circulation pump (P03), a discharge port of the double-effect forced circulation pump (P03) is connected with a feed port of the double-effect heater (E02), and a discharge port of the double-effect heater (E02) is connected with a feed port of the double-effect separator (S02);
the triple-effect evaporation concentration unit comprises a triple-effect separator (S03), a triple-effect heater (E03) and a triple-effect forced circulation pump (P04), a middle discharge hole of the triple-effect separator (S03) is connected with a feed inlet of the triple-effect forced circulation pump (P04), a discharge hole of the triple-effect forced circulation pump (P04) is connected with a feed inlet of the triple-effect heater (E03), a discharge hole of the triple-effect heater (E03) is connected with a feed inlet of the triple-effect separator (S03), and a lower concentrated liquid discharge hole of the triple-effect separator (S03) is connected with a feed inlet of a concentrated liquid discharge pump (P06).
4. A high efficiency energy saving three effect forced circulation evaporation system according to claim 3, characterized in that: the secondary steam outlets of the first-effect separator (S01), the second-effect separator (S02) and the third-effect separator (S03) are all provided with foam removing mechanisms, the foam removing mechanism comprises a reflux cover (101), a steam discharging pipe (102) and a baffle plate (104), the backflow cover (101) is arranged at the top of the separator body (100) in an inverted sealing way, a secondary steam outlet (106) is arranged on the side wall of the backflow hood (101), the steam discharge pipe (102) is arranged inside the backflow hood (101), and the lower pipe orifice of the steam discharging pipe (102) is communicated with the top opening of the separator main body (100), the upper pipe orifice (103) of the steam discharging pipe (102) is an inclined cut, and the direction of the inclined cut is opposite to that of the secondary steam outlet (106), and the baffle plate (104) is fixed below the top opening of the separator main body (100) through a bracket (105).
5. The high-efficiency energy-saving three-effect forced circulation evaporation system of claim 4, wherein: the pipelines of the flash evaporation circulating pump (P10), the forced circulating pumps in the triple-effect evaporation concentration device and the mother liquor pump (P09) are respectively connected with a sewage discharge pipe through valves.
6. The high-efficiency energy-saving three-effect forced circulation evaporation system of claim 5, wherein: cleaning spray headers are arranged at the tops of the first-effect separator (S01), the second-effect separator (S02), the third-effect separator (S03) and the flash tank (S04), and the cleaning spray headers of the first-effect separator (S01), the second-effect separator (S02), the third-effect separator (S03) and the flash tank (S04) are respectively connected with a cleaning water system.
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Application publication date: 20211022 |