CN114349093A - Multi-effect evaporation system for evaporating and concentrating high-salinity wastewater and adjusting method - Google Patents
Multi-effect evaporation system for evaporating and concentrating high-salinity wastewater and adjusting method Download PDFInfo
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Abstract
The invention relates to the technical field of industrial wastewater treatment systems or adjustment methods, and discloses a multi-effect evaporation system for evaporating and concentrating high-salinity wastewater and an adjustment method; the device comprises a heat exchange unit, an evaporation unit and a condensation unit which are connected through pipelines; the heat exchange unit comprises a plurality of heat exchange devices connected in parallel, the evaporation unit is connected with the heat exchange unit and the condensation unit through pipelines, and the connecting pipelines of the evaporation unit and the condensation unit are provided with manual valves. This scheme is through addding the heat transfer unit alternative, for the heat transfer evaporative concentration of waste water continuously provides the heat source, at the heat transfer in-process heat transfer step by step, the while system carries out recycle, promotion energy utilization to the water in the medium water and the waste water as the heat source. The scheme is additionally provided with the manual valve, manual intervention is performed when the system is fluctuated in operation, the system is ensured to continuously and normally operate, and the wastewater treatment efficiency is improved.
Description
Technical Field
The invention relates to the technical field of industrial wastewater treatment systems or adjustment methods, in particular to a multi-effect evaporation system for evaporating and concentrating high-salinity wastewater and an adjustment method.
Background
The high-salinity wastewater has wide sources and is mainly generated in production and life, such as utilization of seawater, high-nitrate industry in industrial production, production of refined and canned fish, wet limestone-gypsum desulfurization manufacturing, ion exchange process, landfill leachate and other processes. The high-salinity wastewater contains a large amount of various pollutants which are difficult to remove, and the contained high-concentration salt can inhibit the growth of microorganisms and can be discharged after being treated. The prior treatment methods are carried out mostly, such as flocculation precipitation, chemical neutralization, COD removal and the like, suspended matters and harmful substances in the wastewater are reduced, the salt content of the treated wastewater is still high, and secondary pollution is easily caused by direct discharge.
The prior art CN206680208U discloses a system for coupling waste heat of boiler flue gas with evaporative concentration of desulfurization wastewater, which adopts high-temperature flue gas to concentrate high-salt wastewater, and specifically adopts the way that the high-temperature flue gas enters a heat exchange device to transfer heat to the high-salt wastewater, so that on one hand, the temperature of the flue gas is reduced, and the emission is convenient; on the other hand, the high-salinity wastewater is heated to evaporate water vapor, the backwater rate is more than 90 percent, and the wastewater solution is concentrated; and the separated concentrated solution is thickened by a thickener and then sent to a gypsum storehouse for storage. However, the prior art still has the following problems:
1) the heat exchange part adopts a flue heat exchanger, the source of a heat source is single, only low-temperature flue gas of a power plant is adopted, and the waste water is heated by the flue heat exchanger to complete the evaporation and concentration of the waste water. However, when the production workshop does not have the low-temperature flue gas use conditions, such as too low flue gas temperature, small flue gas flow, no use of flue gas in the workshop and the like, the heat source of the evaporation system cannot be obtained;
2) in the prior art, the degree of manual participation in the evaporation system is too low, and the operation conditions cannot be correspondingly adjusted in the operation process of the system, so that once the operation environment fluctuates, errors can be caused in the operation process, the operation result is influenced, and even the operation equipment is damaged.
Disclosure of Invention
The invention aims to provide a multi-effect evaporation system for evaporating and concentrating high-salinity wastewater and an adjusting method, and aims to solve the technical problems that in the prior art, the degree of manual participation in an evaporation system is too low, once the operation environment fluctuates, the operation process can be mistaken, the operation result is influenced, and even the operation equipment is damaged.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multi-effect evaporation system for evaporating and concentrating high-salinity wastewater comprises a heat exchange unit, an evaporation unit and a condensation unit which are connected through pipelines; the heat exchange unit comprises a plurality of heat exchange devices connected in parallel, and a manual valve is arranged on a connecting pipeline of the evaporation unit and the condensation unit.
The principle and the advantages of the scheme are as follows:
1. with only through low temperature flue gas among the prior art as the heat source different, this scheme heat transfer unit adopts a plurality of heat transfer device of parallelly connected to heat the rivers that flow through heat transfer unit and form steam, and steam gets into evaporation unit and accomplishes heat transfer and evaporative concentration with high salt waste water. Parallelly connected heat transfer device lasts and forms steam for the evaporation unit lasts and carries out heat exchange and evaporative concentration to high salt waste water, when effectively avoiding not possessing low temperature flue gas service condition in the workshop, flue gas heat exchanger among the prior art influences the continuous heat exchange of evaporation unit to high salt waste water, and then influences the problem of evaporative concentration and the subsequent processing of high salt waste water.
2. Different from the prior art, the scheme adds the manual valve between the evaporation unit and the condensation unit, and when the system operation environment fluctuates to cause the system operation parameters to be abnormal, the water level, the temperature, the vacuum degree or the pressure in the evaporation unit can be manually adjusted, so that the consequences that the operation result is unsatisfactory and even the operation equipment is damaged when the operation environment is unstable in the prior art are avoided.
3. According to the scheme, the high-salinity wastewater is subjected to heat exchange and evaporation concentration in the heat exchange unit and the evaporation unit, and evaporated water vapor enters the condensation unit for condensation and recycling, so that the recycling of water in the high-salinity wastewater is realized; the scheme has the advantages of low energy consumption, low investment, low operation cost, easy regulation, good continuity and the like, and can be popularized and applied to the field of high-salinity wastewater zero-discharge treatment.
Preferably, the evaporation unit comprises at least one group of evaporation devices, and the evaporation devices are arranged in series; the evaporation plant comprises a separator, a circulating pump and a heat exchanger which are connected into a ring through pipelines, and the separator is provided with a wastewater inlet, a wastewater outlet and a steam outlet. By adopting the scheme, the waste water completes heat exchange, evaporation and concentration in the evaporation devices arranged in series, and the evaporated water vapor is condensed and recycled, so that the resource utilization rate is improved.
Preferably, the evaporation unit comprises three groups of evaporation devices connected by pipelines, and the three groups of evaporation devices sequentially comprise a first-stage evaporation device, a second-stage evaporation device and a third-stage evaporation device along the flow direction of wastewater, wherein a steam outlet of a previous-stage separator is connected with a next-stage heat exchanger pipeline, and a wastewater outlet of the previous-stage separator is connected with a wastewater inlet pipeline of the next-stage separator; the first-stage heat exchanger is connected with the heat exchange unit pipeline, and a steam outlet of the third-stage separator is connected with the condensing unit pipeline. By adopting the scheme, the heat entering the evaporation unit can be conveniently and fully utilized to exchange heat with the wastewater step by step, the energy utilization rate is improved, the whole evaporation process has no other external heat input, and the low energy consumption of the system is realized.
Preferably, the condensing unit comprises a head end condensing device and a tail end condensing device. By adopting the scheme, the water in the heat exchanger of the three-stage evaporation device and the water vapor of the third-stage separator are respectively condensed and recovered, so that the recycling of the medium water is realized.
Preferably, the water inlet end and the water outlet end of the head-end condensing device are respectively connected with the first-stage heat exchanger and the heat exchange unit through pipelines; and the water inlet end of the tail end condensing device is connected with the water outlet end pipelines of the second-stage heat exchanger and the third-stage heat exchanger, and a first manual valve and a second manual valve are respectively arranged on the pipelines. By adopting the scheme, the first-stage heat exchanger, the head-end condensing device and the heat exchange unit form a circulating pipeline of medium water, so that the medium water is recycled; meanwhile, the vacuum degree in the evaporation device can be adjusted through the first manual valve and the second manual valve, the system parameters are kept stable while the heat exchange, evaporation and concentration of the wastewater are completed, the system runs stably, and the influence of the system on the wastewater treatment result due to the fluctuation of the external environment is avoided.
Preferably, the head end condensing device and the tail end condensing device are both connected with the cooling tower through pipelines. By adopting the scheme, the water collected by the head end condensing device and the tail end condensing device can be conveniently cooled, the cooled water enters the heat exchange unit to be heated or other water supplies in a workshop, and if the separators at all levels are washed through the cleaning pipeline, the water resource is recycled.
Preferably, the head end condensing device and the tail end condensing device both comprise a condenser and a condensing tank which are connected through pipelines; the head end condensing tank and the tail end condensing tank are connected with a gas-liquid separator through pipelines, and the gas-liquid separator is connected with a vacuum pump. By adopting the scheme, the liquid in the condensing tank can be rapidly cooled conveniently, meanwhile, the gas separated by the gas-liquid separator is pumped out by the vacuum pump, and the liquid in the gas-liquid separator returns to the condensing tank again, so that the recovery and reutilization of the condensate liquid are realized; the vacuum pump provides a vacuum environment for the wastewater treatment pipeline, and improves the vaporization potential of steam in the multi-effect evaporation system.
Preferably, the separator and the condensing tank of each stage of evaporation device are provided with a pressure gauge, a thermometer and a liquid level meter. By adopting the scheme, an operator can observe the actual running state of the system conveniently, and can carry out manual adjustment through related parameters, thereby avoiding the influence of running environment fluctuation on a running result and even damage to running equipment.
Preferably, the system also comprises a wastewater buffer tank, wherein the wastewater buffer tank is connected with a wastewater inlet pipeline of the first-stage separator, and a feed pump connected in parallel is arranged on the pipeline; and a fan or a stirrer is arranged in the wastewater buffer tank. Adopt above-mentioned scheme for waste water reaches the homogeneous uniform volume through aeration or stirring in the waste water buffer pool, is convenient for promote system stability and waste water evaporative concentration's efficiency.
Preferably, the adjusting method of the multi-effect evaporation system for evaporating and concentrating the high-salinity wastewater is used for adjusting the valve opening degree of the manual valve in the multi-effect evaporation system for evaporating and concentrating the high-salinity wastewater according to the display results of the pressure gauge, the thermometer and the liquid level meter; the display result range of each level of pressure gauge is 0.01-0.1 MPa, and the evaporation pressure in the evaporation device is gradually reduced along the conveying direction of the wastewater; the display result range of each thermometer is 75-85 ℃, 60-70 ℃ and 50-60 ℃ along the flowing direction of the wastewater in sequence; if the display result is higher, the valve opening degree of the corresponding manual valve is increased; and if the display result is lower, the valve opening degree of the corresponding manual valve is reduced. By adopting the scheme, when the system is abnormal in operation, an operator can manually adjust the first manual valve and/or the second manual valve to perform manual intervention on the operation process of the system, so that numerical values such as a pressure gauge, a thermometer and a liquid level meter in the system are restored to normal levels.
Drawings
Fig. 1 is a schematic diagram of the multi-effect evaporation system of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: heat exchange unit 1, front-end heat exchanger 11, high-temperature steam pipeline 12, evaporation unit 2, first-stage heat exchanger 211, first-stage separator 212, first-stage circulating pump 213, second-stage heat exchanger 221, second-stage separator 222, second-stage circulating pump 223, third-stage heat exchanger 231, third-stage separator 232, third-stage circulating pump 233, wastewater buffer tank 3, fan 31, stirrer 32, head-end condenser 411, head-end condensing tank 412, head-end gas-liquid separator 413, tail-end condenser 421, tail-end condensing tank 422, tail-end gas-liquid separator 423, cooling tower 43, first manual valve 51, second manual valve 52, and flushing pipeline 6.
Example 1
As shown in figure 1, the multi-effect evaporation system for evaporating and concentrating high-salinity wastewater comprises a wastewater buffer tank 3, a heat exchange unit 1, an evaporation unit 2 and a condensation unit which are connected through pipelines; the heat exchange unit 1 comprises a front-end heat exchanger 11 and a high-temperature steam pipeline 12 which are connected in parallel, and outlet ends of the front-end heat exchanger 11 and the high-temperature steam pipeline 12 are converged into a heat exchange pipeline. Wherein front end heat exchanger 11 is gas heater or tubular heat exchanger, and gas heater is the heat transfer of power plant's low temperature flue gas and medium water, and tubular heat exchanger is the heat transfer of power plant's low temperature heat medium water and medium water, and tubular heat exchanger is convenient for provide the heat source for the multiple-effect vaporization system of waste water when not possessing low temperature flue gas service condition, accomplishes the heat transfer that lasts of waste water.
The evaporation unit 2 comprises at least one group of evaporation devices, specifically three groups of evaporation devices in the embodiment, and a primary evaporation device, a secondary evaporation device and a tertiary evaporation device are sequentially arranged along the flow direction of the wastewater; each stage of evaporation device comprises a separator, a circulating pump and a heat exchanger which are connected into a ring through pipelines, wherein the first stage of heat exchanger 211 is connected with the heat exchange pipeline; the separator is provided with a wastewater inlet, a wastewater outlet and a steam outlet, the steam outlet of the previous separator is connected with the next heat exchanger by a pipeline, and the wastewater outlet of the previous separator is connected with the wastewater inlet of the next separator by a pipeline; the steam outlet of the third stage separator 232 is connected with a condensing unit pipeline; this embodiment sets up three evaporation plant of group, and the make full use of being convenient for gets into the heat and the waste water heat transfer step by step of evaporation unit 2, improves heat utilization rate, and whole evaporation process does not have all the other outside heat input, realizes the low energy consumption of system.
The condensing unit comprises a head end condensing device and a tail end condensing device, the head end condensing device and the tail end condensing device both comprise a condenser and a condensing tank which are connected through pipelines, and the condenser and the condensing tank are both connected with the same cooling tower 43 through pipelines; the head-end condensing tank 412 and the tail-end condensing tank 422 are both connected with a gas-liquid separator through pipelines, and the gas-liquid separators are both connected with vacuum pumps, so that the gas in the water vapor is separated, and simultaneously, a vacuum environment is provided for a wastewater treatment pipeline, and the vaporization potential of the steam in the multi-effect evaporation system is improved.
The water inlet end of the head-end condenser 411 is connected with the water outlet end of the first-stage heat exchanger 211 through a pipeline, the water outlet end of the head-end condensing tank 412 is connected with the water inlet end of the front-end heat exchanger 11 through a pipeline, and the heat exchange medium water is recycled; the water outlet ends of the second-stage heat exchanger 221 and the third-stage heat exchanger 231 are connected with the tail end condensing tank 422 through pipelines, and the connecting pipelines are respectively provided with a first manual valve 51 and a second manual valve 52, so that an operator can conveniently adjust the vacuum degree of the corresponding separator through adjusting the opening degree of the manual valves, the manual intervention system is realized, and the system is enabled to recover the normal operation. The steam outlet of the third stage separator 232 is connected with the tail end condenser 421 by a pipeline; and flushing pipelines 6 are connected between the tail end condensing tank 422 and the third-stage separator.
The three-stage separator and the condensing tank are respectively provided with a pressure gauge, a thermometer and a liquid level meter, so that an operator can conveniently monitor the real-time running state of the system; in addition, the waste water conveying pipeline is provided with a valve and a pump, which are the prior art and are not described in detail herein.
The wastewater buffer tank 3 is provided with a fan 31 or a stirrer 32, so that the wastewater is homogenized conveniently; the wastewater buffer tank 3 is connected with a wastewater inlet pipeline of the first-stage separator 212, and a water feeding pump connected in parallel is arranged on the connecting pipeline, so that the wastewater is continuously subjected to evaporative concentration treatment, and the wastewater treatment efficiency is improved.
The specific implementation process of this embodiment is as follows: high salt waste water and workshop sparge water all get into waste water buffer pool 3, homogeneity under the effect of fan 31 aeration or agitator 32 stirring, go into first order separator 212 with the waste water pump of homogeneity, waste water gets into first order heat exchanger 211 under the effect of first order circulating pump 213 afterwards, waste water carries out the heat exchange with the vapor that heat transfer unit 1 conveyed in first order heat exchanger 211, vapor after the heat transfer gets into head end condenser 411, vapor is the water under the vacuum pumping effect of the vacuum pump of connecting on head end vapour and liquid separator 413 quick cooling, the water after the cooling is heated in being sent to heat transfer unit 1 by the circulating pump after crossing head end condensate tank 412, vapor after the heating gets into first order heat exchanger 211 again. When the workshop environment does not have the use condition of low-temperature flue gas, starting low-temperature heat medium water of the power plant to enter the tubular heat exchanger to heat the medium water to form water vapor or starting the water vapor of the high-temperature steam pipeline 12 of the power plant to exchange heat with the wastewater, namely, the tubular heat exchanger and the high-temperature steam pipeline 12 are matched to use to continuously provide a heat source for the evaporation and concentration of the wastewater; when the workshop environment has the use condition of low-temperature flue gas, starting the low-temperature flue gas of the power plant to enter a flue gas heat exchanger to heat medium water to form water vapor or starting the water vapor of a high-temperature steam pipeline 12 of the power plant to exchange heat with the wastewater, namely, the flue gas heat exchanger and the high-temperature steam pipeline 12 are matched to use to continuously provide a heat source for the evaporation and concentration of the wastewater; the heat source can be continuously provided for the evaporation concentration of the wastewater under any condition, the evaporation concentration of the wastewater is continuously completed, and the wastewater treatment efficiency is improved.
The waste water after heat exchange enters a first-stage separator 212 to finish first water evaporation and waste water concentration, the evaporated water vapor enters a second-stage heat exchanger 221 to provide a heat source for a second-stage evaporation device, the concentrated waste water enters a second-stage separator 222, then the waste water enters the second-stage heat exchanger 221 under the action of a second-stage circulating pump 223, and enters the second-stage separator 222 after heat exchange in the second-stage heat exchanger 221 to finish second water evaporation and waste water concentration; the evaporated water vapor enters the third-stage heat exchanger 231 to provide a heat source for the third-stage evaporation device, the concentrated wastewater enters the third-stage separator 232, then the wastewater enters the third-stage heat exchanger 231 under the action of the third-stage circulating pump 233, and enters the third-stage separator 232 after heat exchange in the third-stage heat exchanger 231 to complete third-stage water evaporation and wastewater concentration; the steam that evaporates gets into tail end condenser 421, gets into tail end condensing tank 422 afterwards, accomplishes the recycle of moisture in the waste water, improves water resource utilization, and the water of retrieving can be used to other water supplies in workshop, if wash the separator at different levels through washing pipeline 6, and the water after washing is collected and is got into waste water buffer pool 3, continues to get into the system and accomplishes the evaporative concentration.
In addition, the water vapor after heat exchange in the second-stage heat exchanger 221 and the third-stage heat exchanger 231 enters the tail end condensing tank 422 through the pipeline, the pipeline is respectively provided with the first manual valve 51 and the second manual valve 52, in the running process of the system, parameter display abnormalities of a thermometer and a pressure gauge on a separator and the condensing tank are often caused by the fluctuation of the running environment or the fluctuation generated along with the running of the system, and when the parameter display abnormalities of the thermometer and the pressure gauge arranged on the separator are required, manual intervention of an operator is needed, so that the system is recovered to be in normal running.
As shown in fig. 1, a method for adjusting a multi-effect evaporation system for evaporative concentration of high salinity wastewater, the valve opening degree of a first manual valve 51 and a second manual valve 52 is adjusted according to the display results of a pressure gauge, a temperature gauge and a water level gauge on a first stage separator 212 and a second stage separator 222, particularly, the display results of the pressure gauge and the temperature gauge, to maintain the stable operation of the system.
The pressure gauge on the three-stage separator displays the vacuum degree of the system in operation, the lower vacuum degree (low pressure) is convenient for improving the vaporization potential of steam in the multi-effect evaporation system, so that under the normal operation condition of the system, the parameter range of the pressure gauge on the three-stage separator is 0.01-0.1 MPa, the parameter ranges of the pressure gauge and the thermometer are sequentially decreased progressively along the flow direction of wastewater, the pressure in the next-stage evaporation device is lower than that in the previous-stage evaporation device in the operation process of the system, the requirement of the system on the operation parameters is met, and the gradient utilization of heat energy is convenient; the parameter ranges of the thermometer in the three-stage separator are 75-85 ℃, 60-70 ℃ and 50-60 ℃ in sequence along the flow direction of the wastewater. As the wastewater is transported away from the evaporation system, the pressure of the evaporation system increases and the temperature increases, causing a decrease in the efficiency of evaporative concentration of the wastewater in the system. At this time, the operator can adjust the speed at which the vacuum pump on the tail gas-liquid separator 423 pumps air by manually adjusting the valve openings of the first manual valve 51 and the second manual valve 52, thereby adjusting the vacuum degree in the separator, so that the temperature and the pressure of the separator are restored to normal.
Specifically, when the display data of the pressure gauge on the second-stage separator 222 is higher than the display data of the pressure gauge on the first-stage separator 212, or the temperature on the second-stage separator 222 is higher than 70 ℃, fine adjustment is performed to unscrew the second manual valve 52, the valve opening of the second manual valve 52 is increased, the speed of the vacuum pump on the tail-end gas-liquid separator 423 for pumping the air in the second-stage separator 222 is increased, and the pressure and the temperature in the second-stage separator 222 are reduced to enable the pressure and the temperature to be normal.
When the display data of the pressure gauge on the second-stage separator 222 is lower than the display data of the pressure gauge on the third-stage separator 232 or the temperature on the second-stage separator 222 is lower than 60 ℃, fine adjustment is carried out to tighten the second manual valve 52, the opening degree of the valve of the second manual valve 52 is reduced, the speed of the vacuum pump on the tail-end gas-liquid separator 423 for pumping the air in the second-stage separator 222 is reduced, and the pressure and the temperature in the second-stage separator 222 are increased to enable the second-stage separator 222 to be normal.
When the pressure gauge on the first stage separator 212 displays that the data is higher than 0.1MPa or the temperature on the second stage separator 222 is higher than 85 ℃, the first manual valve 51 is loosened by fine adjustment to increase the opening degree of the first manual valve 51, the speed of the vacuum pump on the tail end gas-liquid separator 423 for pumping the air in the first stage separator 212 is increased, and the pressure and the temperature in the first stage separator 212 are reduced to be normal.
When the display data of the pressure gauge on the first-stage separator 212 is lower than the display data of the pressure gauge on the second-stage separator 222 or the temperature on the second-stage separator 222 is lower than 75 ℃, fine adjustment is carried out to tighten the first manual valve 51, the opening degree of the valve of the first manual valve 51 is reduced, the speed of the vacuum pump on the tail-end gas-liquid separator 423 for pumping the air in the first-stage separator 212 is reduced, and the pressure and the temperature in the first-stage separator 212 are increased to be normal.
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. A multiple-effect evaporation system for evaporative concentration of high-salinity wastewater is characterized in that: the device comprises a heat exchange unit, an evaporation unit and a condensation unit which are connected through pipelines; the heat exchange unit comprises a plurality of heat exchange devices connected in parallel, and a manual valve is arranged on a connecting pipeline of the evaporation unit and the condensation unit.
2. A multi-effect evaporation system for evaporative concentration of high salinity wastewater according to claim 1, characterized in that: the evaporation unit comprises at least one group of evaporation devices, and the evaporation devices are connected in series; the evaporation plant comprises a separator, a circulating pump and a heat exchanger which are connected into a ring through pipelines, and the separator is provided with a wastewater inlet, a wastewater outlet and a steam outlet.
3. A multi-effect evaporation system for evaporative concentration of high salinity wastewater according to claim 2, characterized in that: the evaporation unit comprises three groups of evaporation devices connected by pipelines, and a first-stage evaporation device, a second-stage evaporation device and a third-stage evaporation device are sequentially arranged along the flow direction of wastewater, wherein a steam outlet of a previous-stage separator is connected with a next-stage heat exchanger by a pipeline, and a wastewater outlet of the previous-stage separator is connected with a wastewater inlet of the next-stage separator by a pipeline; the first-stage heat exchanger is connected with the heat exchange unit pipeline, and a steam outlet of the third-stage separator is connected with the condensing unit pipeline.
4. A multi-effect evaporation system for evaporative concentration of high salinity wastewater according to claim 3, characterized in that: the condensing unit includes a head end condensing unit and a tail end condensing unit.
5. The multi-effect evaporation system for evaporative concentration of high salinity wastewater according to claim 4, characterized in that: the water inlet end and the water outlet end of the head-end condensing device are respectively connected with the first-stage heat exchanger and the heat exchange unit pipeline; and the water inlet end of the tail end condensing device is connected with the water outlet end pipelines of the second-stage heat exchanger and the third-stage heat exchanger, and a first manual valve and a second manual valve are respectively arranged on the pipelines.
6. The multi-effect evaporation system for evaporative concentration of high salinity wastewater according to claim 5, characterized in that: and the head end condensing device and the tail end condensing device are both connected with the cooling tower through pipelines.
7. The multi-effect evaporation system for evaporative concentration of high salinity wastewater according to claim 6, characterized in that: the head end condensing device and the tail end condensing device both comprise a condenser and a condensing tank which are connected through pipelines; the head end condensing tank and the tail end condensing tank are connected with a gas-liquid separator through pipelines, and the gas-liquid separator is connected with a vacuum pump.
8. The multi-effect evaporation system for evaporative concentration of high salinity wastewater according to claim 7, characterized in that: and the separator and the condensing tank of each stage of evaporation device are respectively provided with a pressure gauge, a thermometer and a liquid level meter.
9. The multi-effect evaporation system for evaporative concentration of high salinity wastewater according to claim 8, characterized in that: the device also comprises a wastewater buffer tank, wherein the wastewater buffer tank is connected with a wastewater inlet pipeline of the first-stage separator, and a feed pump connected in parallel is arranged on the pipeline; and a fan or a stirrer is arranged in the wastewater buffer tank.
10. A regulating method of a multi-effect evaporation system for evaporating and concentrating high-salinity wastewater is characterized in that: adjusting the valve opening degree of a manual valve in the multi-effect evaporation system for evaporating and concentrating the high-salinity wastewater according to the display results of the pressure gauge, the thermometer and the liquid level meter, wherein the manual valve is used for being used for evaporating and concentrating the high-salinity wastewater; the display result range of each level of pressure gauge is 0.01-0.1 MPa, and the evaporation pressure in the evaporation device is gradually reduced along the conveying direction of the wastewater; the display result range of each thermometer is 75-85 ℃, 60-70 ℃ and 50-60 ℃ along the flowing direction of the wastewater in sequence; if the display result is higher, the valve opening degree of the corresponding manual valve is increased; and if the display result is lower, the valve opening degree of the corresponding manual valve is reduced.
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| CN115448516A (en) * | 2022-08-19 | 2022-12-09 | 浏阳市化工厂有限公司 | Wastewater treatment equipment with recycling function |
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