CN216855692U - Falling film evaporation and forced reverse circulation combined multi-effect evaporation device - Google Patents
Falling film evaporation and forced reverse circulation combined multi-effect evaporation device Download PDFInfo
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- CN216855692U CN216855692U CN202122533974.4U CN202122533974U CN216855692U CN 216855692 U CN216855692 U CN 216855692U CN 202122533974 U CN202122533974 U CN 202122533974U CN 216855692 U CN216855692 U CN 216855692U
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Abstract
The utility model provides a multiple-effect evaporation device combining falling film evaporation and forced reverse circulation, wherein an outlet of a feed pump is connected with an inlet of a falling film evaporator, an outlet of the falling film evaporator is connected with an inlet of a first-effect separator, a gas-phase outlet of the first-effect separator is connected with a steam inlet of a second-effect heater, a liquid-phase outlet of the first-effect separator is connected with an inlet of a first-effect circulating pump, an outlet of the first-effect circulating pump is connected with a circulating inlet of the falling film evaporator or an inlet of the second-effect separator, a gas-phase outlet of the second-effect separator is connected with an inlet of a condenser, a liquid-phase outlet of the second-effect separator is connected with an inlet of the second-effect heater, an outlet of the second-effect heater is connected with an inlet of the second-effect circulating pump, and an outlet of the second-effect circulating pump is connected with an axial feed inlet of the second-effect separator. The first effect evaporation adopts a falling film evaporator, so that the low-rate evaporation concentration of the desulfurization wastewater can be realized, and the second effect adopts a forced reverse circulation evaporator, so that the high-rate evaporation concentration can be realized, thereby being beneficial to saving energy and meeting the requirements of different concentration rates under different working conditions.
Description
Technical Field
The utility model relates to the technical field of wet desulphurization wastewater thermal concentration and reduction, in particular to a multiple-effect evaporation device combining falling film evaporation and forced reverse circulation.
Background
The wet desulphurization process has the advantages of high desulphurization efficiency, low operation cost, mature technology, simple operation and the like, and occupies an absolute leading position in the field of flue gas desulphurization and purification treatment. The wet desulphurization technology accounts for more than 95% in the domestic flue gas desulphurization purification field and more than 99% in the flue gas ultra-low emission treatment field.
A certain amount of wastewater can be generated in the wet desulphurization process, and the wastewater is used as terminal wastewater of a power plant, so that the water quality is the worst. The salt-free high-concentration calcium carbonate contains heavy metals, a large amount of calcium, magnesium, chloride ions and the like, and has the characteristics of high salt content, high suspended matter content, high COD (chemical oxygen demand) and the like. The existence of calcium and magnesium ions can cause the scaling problem of a subsequent treatment unit, and the existence of a large amount of chloride ions can cause flue corrosion to further influence the safe operation of equipment. 14 days 4 months 4 in 2015, the State administration issues a Water pollution prevention action plan, abbreviated as 'Ten pieces of water', and proposes to prohibit the discharge of desulfurization wastewater of coal-fired power plants. The 'feasible technical guide for pollution control of thermal power plants' issued in 2017 definitely mentions that the key of near-zero emission of wastewater is to realize zero emission of desulfurization wastewater.
The conventional desulfurization wastewater zero-discharge technology mainly comprises the following steps: a pretreatment technology of the desulfurization wastewater, a concentration and decrement technology and an evaporation and crystallization technology. Most of the main process routes are the permutation and combination of the three technologies.
The desulfurization wastewater has high content of suspended substances, calcium ions and magnesium ions, especially calcium sulfate in a supersaturated state, has high scaling tendency, and needs to be pretreated and added with a medicament for softening in order to ensure the stable operation of a subsequent process. The dosage of the medicament is large, the dosing cost is high, and a large amount of sludge can be generated, so that new pollution is brought to the environment;
the concentration and decrement aims to reduce the water quantity of the desulfurization wastewater and reduce the treatment pressure of an evaporative crystallization system. The concentration and decrement technology is divided into membrane concentration and thermal concentration. The high-rate concentration of the desulfurization wastewater can be realized by adopting the membrane method for concentration, but the problems of high investment, cleaning and maintenance cost, easy pollution and blockage and the like exist, and the wastewater needs to be subjected to deep pretreatment to meet the water inlet requirement of a membrane system; the thermal method is adopted for concentration, so that the requirement on water quality is low, and the concentration can be directly carried out without pretreatment by effectively controlling the concentration ratio.
The evaporative crystallization technology is divided into bypass flue evaporation, MVR evaporative crystallization and multi-effect evaporative crystallization, wherein the bypass flue evaporation is the mainstream technology at present due to the advantages of small investment, low operation cost, low water consumption and low energy consumption.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is to provide a multi-effect evaporation device combining falling film evaporation and forced reverse circulation so as to solve the defects of the prior art in the background art.
In order to solve the above technical problem, an embodiment of the present invention provides the following technical solutions:
a multiple-effect evaporation device combining falling film evaporation and forced reverse circulation comprises a feed pump, a falling film evaporator, a first-effect separator, a first-effect circulating pump, a second-effect separator, a second-effect circulating pump, a second-effect heater, a condenser, a condensed water tank and a vacuum pump, wherein an outlet of the feed pump is connected with an inlet of the falling film evaporator, an outlet of the falling film evaporator is connected with an inlet of the first-effect separator, a gas-phase outlet of the first-effect separator is connected with a steam inlet of the second-effect heater, a liquid-phase outlet of the first-effect separator is connected with an inlet of the first-effect circulating pump, an outlet of the first-effect circulating pump is connected with a circulating inlet of the falling film evaporator or an inlet of the second-effect separator, a gas-phase outlet of the second-effect separator is connected with an inlet of the condenser, a liquid-phase outlet of the second-effect separator is connected with an inlet of the second-effect heater, and an outlet of the second-effect heater is connected with an inlet of the second-effect circulating pump, and the outlet of the two-effect circulating pump is connected with the axial feed inlet of the two-effect separator.
Preferably, the outlet of the condenser is connected with the inlet of the condensed water tank, and the gas phase outlet of the condensed water tank is connected with the inlet of the vacuum pump.
Preferably, the inlet of the feed pump is connected with a desulfurization wastewater output pipeline.
Preferably, the heating source adopted by the falling-film evaporator is low-temperature waste heat or waste heat.
Preferably, the heating source used by the dual-effect heater is secondary steam generated by the falling film evaporator.
Preferably, the input end of the condenser is connected with the cold water output end of the circulating water system, and the output end of the condenser is connected with the hot water input end of the circulating water system.
The technical scheme of the utility model has the following beneficial effects:
a. the device is adopted to carry out thermal concentration decrement on the desulfurization wastewater, and the desulfurization wastewater can be directly concentrated without pretreatment;
b. the device combines the falling film evaporator and the forced reverse circulation evaporator, and fully exerts the advantages of the falling film evaporator and the forced reverse circulation evaporator. The first-effect evaporation adopts a falling film evaporator, so that the low-rate evaporation and concentration of the desulfurization wastewater can be realized, and the second-effect evaporation adopts a forced reverse circulation evaporator, so that the high-rate evaporation and concentration can be realized, thereby being beneficial to saving energy and meeting the requirements of different concentration rates under different working conditions;
c. when high-magnification evaporation concentration is carried out, a forced reverse circulation evaporator is adopted to change the flow direction of the material, so that the material is operated in a reverse circulation manner, the anti-scaling capability of the device is enhanced, the scaling of a system and a pipeline is effectively prevented, the cleaning period of the equipment is shortened, and the operation cost is reduced;
d. the two-effect separator adopts axial feeding, and the wastewater flows vertically, so that solid phase segregation is effectively overcome, and the nucleation speed and the crystallization speed are increased.
Drawings
FIG. 1 is a schematic flow diagram of a multi-effect evaporation device combining falling film evaporation and forced reverse circulation according to the present invention.
In the figure, 1-a feed pump; 2-falling film evaporator; 3-a one-effect separator; 4-one-effect circulating pump; 5-a two-effect separator; 6-two-effect circulating pump; 7-a dual-effect heater; 8-a condenser; 9-condensation water tank; 10-vacuum pump.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
As shown in figure 1, the multi-effect evaporation device combining falling film evaporation and forced reverse circulation comprises a feed pump 1, a falling film evaporator 2, a first-effect separator 3, a first-effect circulating pump 4, a second-effect separator 5, a second-effect circulating pump 6, a second-effect heater 7, a condenser 8, a condensate water tank 9 and a vacuum pump 10, wherein an inlet (A) of the feed pump 1 is connected with a desulfurization wastewater output pipeline, an outlet of the feed pump 1 is connected with an inlet of the falling film evaporator 2, an outlet of the falling film evaporator 2 is connected with an inlet of the first-effect separator 3, a gas-phase outlet of the first-effect separator 3 is connected with a steam inlet of the second-effect heater 7, a liquid-phase outlet of the first-effect separator 3 is connected with an inlet of the first-effect circulating pump 4, an outlet of the first-effect circulating pump 4 is connected with a circulating inlet of the falling film evaporator 2 or an inlet of the second-effect separator 5, a gas-phase outlet of the second-effect separator 5 is connected with an inlet of the condenser 8, the liquid phase outlet of the double-effect separator 5 is connected with the inlet of the double-effect heater 7, the outlet of the double-effect heater 7 is connected with the inlet of the double-effect circulating pump 6, and the outlet of the double-effect circulating pump 6 is connected with the axial feed inlet of the double-effect separator 5. Meanwhile, the outlet of the condenser 8 is connected with the inlet of a condensed water tank 9, and the gas phase outlet of the condensed water tank 9 is connected with the inlet of a vacuum pump 10.
The working principle of the utility model is as follows:
the desulfurization wastewater enters a falling-film evaporator 2 through a feed pump 1, and a heating source adopted by the falling-film evaporator 2 is low-temperature waste heat or waste heat; heat exchange is carried out between the waste heat and the low-temperature waste heat or the waste heat in the falling film evaporator 2, the heated waste water is subjected to flash evaporation concentration in the first-effect separator 3, and the generated secondary steam is used as a two-effect heating heat source; the concentrated waste water returns to the falling film evaporator 2 through the one-effect circulating pump 3 for circulating evaporation or is sent to the two-effect separator 5 for high-rate evaporation and concentration.
The wastewater entering the two-effect separator 5 firstly flows through the two-effect heater 7, the heating source adopted by the two-effect heater 7 is secondary steam generated by the falling film evaporator 2, the secondary steam generated by the first effect is heated, and then the wastewater is pumped into the two-effect separator 5 through the axial feed port by the two-effect circulating pump 6, so that the flow direction of the original material is changed, the material is operated in a reverse circulation manner, and the concentration and evaporation with higher multiplying power are realized; the generated secondary steam enters a condenser for cooling and condensation, and the recovered condensate water is sent back to a desulfurization system for later use; the switching between high-rate evaporation concentration and low-rate evaporation concentration can be realized according to the requirements of different concentration rates under different working conditions, and finally generated high-concentration wastewater enters a subsequent evaporation crystallization process for treatment.
Circulating cooling water (B in the figure) at the input end of the condenser (8) is provided by a plant circulating water system, secondary steam generated by evaporation is cooled and condensed after entering the condenser (8), the heated circulating cooling water (D in the figure) returns to the plant circulating water system, and the recovered condensed water is returned to the desulfurization system for later use. The whole evaporation process is carried out under vacuum, and the non-condensable gas inside the apparatus is exhausted to the atmosphere by the vacuum pump 10 (C in the figure). In the figure, E represents flue gas condensate, and F represents concentrated desulfurization wastewater.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model as defined in the appended claims.
Claims (6)
1. A multiple-effect evaporation device combining falling film evaporation and forced reverse circulation is characterized by comprising a feed pump (1), a falling film evaporator (2), a first-effect separator (3), a first-effect circulating pump (4), a second-effect separator (5), a second-effect circulating pump (6), a second-effect heater (7), a condenser (8), a condensed water tank (9) and a vacuum pump (10), wherein an outlet of the feed pump (1) is connected with an inlet of the falling film evaporator (2), an outlet of the falling film evaporator (2) is connected with an inlet of the first-effect separator (3), a gas-phase outlet of the first-effect separator (3) is connected with a steam inlet of the second-effect heater (7), a liquid-phase outlet of the first-effect separator (3) is connected with an inlet of the first-effect circulating pump (4), an outlet of the first-effect circulating pump (4) is connected with a circulating inlet of the falling film evaporator (2) or an inlet of the second-effect separator (5), the gas phase outlet of the double-effect separator (5) is connected with the inlet of the condenser (8), the liquid phase outlet of the double-effect separator (5) is connected with the inlet of the double-effect heater (7), the outlet of the double-effect heater (7) is connected with the inlet of the double-effect circulating pump (6), and the outlet of the double-effect circulating pump (6) is connected with the axial feed inlet of the double-effect separator (5).
2. A multiple effect evaporation plant combining falling film evaporation with forced reverse circulation according to claim 1, characterized in that the outlet of the condenser (8) is connected to the inlet of a condensed water tank (9), and the gas phase outlet of the condensed water tank (9) is connected to the inlet of a vacuum pump (10).
3. A multi-effect evaporation plant combining falling film evaporation with forced reverse circulation according to claim 1, characterized in that the inlet of the feed pump (1) is connected with a desulfurization waste water output pipeline.
4. A multi-effect evaporation device combining falling film evaporation and forced reverse circulation according to claim 1, characterized in that the heating source used by the falling film evaporator (2) is low temperature waste heat or waste heat.
5. A multi-effect evaporation device combining falling film evaporation and forced reverse circulation according to claim 1, characterized in that the heating source used by the dual-effect heater (7) is the secondary steam generated by the falling film evaporator (2).
6. The multiple effect evaporation device of the falling film evaporation and forced reverse circulation combination according to claim 1, characterized in that the input end of the condenser (8) is connected with the cold water output end of the circulating water system, and the output end of the condenser (8) is connected with the hot water input end of the circulating water system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122533974.4U CN216855692U (en) | 2021-10-21 | 2021-10-21 | Falling film evaporation and forced reverse circulation combined multi-effect evaporation device |
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| CN202122533974.4U CN216855692U (en) | 2021-10-21 | 2021-10-21 | Falling film evaporation and forced reverse circulation combined multi-effect evaporation device |
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