CN216946290U - Waste water treatment system of steam power plant - Google Patents
Waste water treatment system of steam power plant Download PDFInfo
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- CN216946290U CN216946290U CN202121122994.6U CN202121122994U CN216946290U CN 216946290 U CN216946290 U CN 216946290U CN 202121122994 U CN202121122994 U CN 202121122994U CN 216946290 U CN216946290 U CN 216946290U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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Abstract
A waste water treatment system of a thermal power plant comprises a heat pump, a flash evaporator group and a heater. The heat pump comprises a first heat source inlet and a first heat source outlet communicated with the first heat source inlet, and a second heat source inlet and a second heat source outlet communicated with the second heat source inlet. The liquid inlet of the flash evaporator group is communicated with the wastewater inlet pipe, and the steam outlet of the flash evaporator group is communicated with the first heat source inlet. The heater comprises a third heat source inlet and a third heat source outlet communicated with the third heat source inlet, the third heat source inlet is communicated with the second heat source inlet, and the third heat source outlet is communicated with the second heat source outlet. Wherein, the inlet of flash vaporizer group with the liquid outlet intercommunication of heater, the heater is used for by the waste water that the inlet of heater flowed in heats, flash vaporizer group configuration is passed through the steam that steam outlet provided is as the first heat source of heat pump, the convection current is through the heat supply network water of heat pump heats.
Description
Technical Field
The utility model relates to the technical field of wastewater treatment, in particular to a wastewater treatment system of a thermal power plant.
Background
With the development of society and the promotion of urbanization process, the pollution of water resources draws more and more attention of society. How to effectively treat the wastewater is one of the important targets for realizing sustainable development. However, the existing wastewater treatment methods have their own drawbacks.
The current waste liquid treatment equipment adopts the principle of negative pressure low-temperature distillation to the waste liquid, utilizes the compressor to transfer the heat of steam condensation to the waste liquid again, and the system needs to consume electric energy when in operation, and also relates to refrigerant circulation, and the system is complicated and has higher operation cost.
Therefore, it is urgent in the field of wastewater treatment to provide a wastewater treatment device with high comprehensive energy utilization efficiency, simple system form and low operation cost.
SUMMERY OF THE UTILITY MODEL
Objects of the first utility model
The utility model aims to provide a thermal power plant wastewater treatment system, which can be used for treating wastewater and simultaneously using consumed heat for heating heat supply network water, can obviously improve the energy utilization efficiency of a wastewater treatment device, and reduces the cost of wastewater treatment.
(II) technical scheme
In order to solve the above problems, a first aspect of the present invention provides a thermal power plant wastewater treatment system, which includes a heat pump, a flash evaporator set and a heater. The heat pump comprises a first heat source inlet, a first heat source outlet communicated with the first heat source inlet, a second heat source outlet communicated with the second heat source inlet, a first heat source outlet communicated with the second heat source inlet, a second heat source outlet communicated with the second heat source outlet, a heat pump body and a heat pump body, wherein the heat pump body is provided with a first heat source inlet and a second heat source outlet;
A liquid inlet of the flash evaporator group is communicated with a wastewater inlet pipe, and a steam outlet of the flash evaporator group is communicated with the first heat source inlet;
the heater comprises a third heat source inlet and a third heat source outlet communicated with the third heat source inlet, the third heat source inlet is communicated with the second heat source inlet, and the third heat source outlet is communicated with the second heat source outlet;
wherein, the inlet of flash vessel group with the liquid outlet intercommunication of heater, the heater be used for by the waste water of the inlet inflow of heater heats, flash vessel group configuration is passed through the steam that steam outlet provided is right the heat supply network pipeline of heat pump heats.
In the embodiment of the application, the strong brine through the heating passes through flash evaporator group flash distillation in the heater, and in the steam entering heat pump after the flash distillation, heat the heat supply network water in the heat pump as first heat source for can be when handling waste water, be used for heating the water in the heat supply network pipeline with the heat that consumes, can show the energy utilization efficiency who improves effluent treatment plant, reduced waste water treatment's cost.
Preferably, the method further comprises the following steps: and the liquid inlet of the condenser group is communicated with the wastewater inlet pipe, and the liquid outlet of the condenser group is communicated with the liquid inlet of the heater.
Furthermore, the condenser group comprises N condensers which are composed of a 1 st-stage condenser and a 2 nd-stage condenser … …, the condensers from the 1 st-stage condenser to the Nth-stage condenser are sequentially communicated, a liquid inlet of the condenser from the 1 st-stage condenser is communicated with a wastewater inlet pipe, and a liquid outlet of the condenser from the Nth-stage condenser is communicated with a liquid inlet of the heater;
the flash evaporator group comprises N +1 flash evaporators which are composed of a 0 th-stage flash evaporator, a 1 st-stage flash evaporator and a … … nth-stage flash evaporator, the flash evaporators from the nth stage to the 0 th stage are sequentially communicated, a liquid inlet of the nth-stage flash evaporator is communicated with a liquid outlet of the heater, and a liquid outlet of the 0 th-stage flash evaporator is used for discharging wastewater;
wherein N > 1.
Furthermore, steam outlets corresponding to the N flash evaporators are communicated with steam inlets corresponding to the N condensers in a one-to-one correspondence manner;
and steam outlets corresponding to the flash evaporators from the Nth stage to the 1 st stage are correspondingly communicated with steam inlets corresponding to the condensers from the Nth stage to the 1 st stage, and the steam outlet of the flash evaporator from the 0 th stage is communicated with a first heat source inlet.
Furthermore, condensed water inlets are formed in the 1 st-M stage condensers respectively, and condensed water outlets are formed in the N condensers respectively;
and M is more than or equal to 1 and less than N, a condensed water inlet of the M-1 stage condenser is communicated with a condensed water outlet of the M stage condenser, and a condensed water outlet of the 1 st stage condenser is communicated with the first heat source outlet.
Preferably, the method further comprises the following steps: solid-liquid separation equipment, including first water outlet, first water inlet and discharge gate, first water inlet with the liquid outlet intercommunication of flash evaporator group, first water outlet with the inlet intercommunication of condenser group, the discharge gate is used for discharging solid matter solid-liquid separation equipment.
Preferably, the wastewater inlet pipe is communicated with a liquid inlet of the Nth-stage flash evaporator;
preferably, the method further comprises the following steps: the waste water tank comprises a second water inlet, a second water outlet, a liquid return port and a suspension liquid outlet;
the second water inlet is communicated with the liquid outlet of the flash evaporator group, the second water outlet is communicated with the liquid inlet of the condenser group, the turbid liquid outlet is communicated with the first water inlet, and the liquid return port is communicated with the first water outlet.
Preferably, the method further comprises the following steps: the liquid inlet of the pretreatment device is communicated with the wastewater inlet pipe, the liquid outlet of the pretreatment device is communicated with the liquid inlet of the condenser group, and the pretreatment device is used for pretreating wastewater to be treated;
wherein the pretreatment comprises one or more of dosing, physical sedimentation, electrodialysis, reverse osmosis, forward osmosis, ultrafiltration and nanofiltration.
Furthermore, N condensers are integrated in the cavity, and the condensers are arranged at intervals; and/or
The N +1 flash evaporators are integrated in the cavity, and the flash evaporators are arranged at intervals.
Further, the power plant wastewater comprises strong brine, desulfurization wastewater, cooling tower circulating water drainage, process drainage or boiler drainage.
(III) advantageous effects
The technical scheme of the utility model has the following beneficial technical effects:
the utility model provides a thermal power plant wastewater treatment system in a first aspect, which comprises a heat pump, a flash evaporator group and a heater. The heat pump comprises a first heat source inlet and a first heat source outlet communicated with the first heat source inlet, and a second heat source inlet and a second heat source outlet communicated with the second heat source inlet. The liquid inlet of the flash evaporator group is communicated with the wastewater inlet pipe, and the steam outlet of the flash evaporator group is communicated with the first heat source inlet. The heater comprises a third heat source inlet and a third heat source outlet communicated with the third heat source inlet, the third heat source inlet is communicated with the second heat source inlet, and the third heat source outlet is communicated with the second heat source outlet. Wherein, the inlet of flash vaporizer group with the liquid outlet intercommunication of heater, the heater is used for by the waste water that the inlet of heater flowed in heats, flash vaporizer group configuration is passed through the steam that steam outlet provided is as the first heat source of heat pump, the convection current is through the heat supply network water of heat pump heats. In the embodiment of this application, the strong brine heats in through the heater to through flash vaporizer group flash distillation, in the steam entering heat pump after the flash distillation, heat the heat supply network water in the heat pump as first heat source, make and can be when handling waste water, be used for heating the water in the heat supply network pipeline with the heat that consumes, can show the energy utilization efficiency who improves effluent treatment plant, reduced waste water treatment's cost.
Drawings
FIG. 1 is a schematic diagram of a waste water treatment system of a thermal power plant provided by the present invention;
FIG. 2 is a schematic diagram of a waste water treatment system of a thermal power plant provided by the present invention, in which a solid-liquid separation device is illustrated;
FIG. 3 is a schematic structural diagram of a waste water treatment system of a thermal power plant provided by the utility model, wherein the connection relationship of waste water inlet pipes is illustrated;
FIG. 4 is a schematic diagram of the structure of a waste water treatment system of a thermal power plant provided by the utility model, wherein the connection relationship of waste water tanks is illustrated;
FIG. 5 is a schematic diagram of a thermal power plant wastewater treatment system provided by the present invention;
FIG. 6 is a schematic structural diagram of a wastewater treatment system of a thermal power plant provided by the utility model, wherein the connection relationship of pretreatment devices is illustrated.
Reference numerals:
1. a heat pump; 2. a heater; 3. a flash evaporator group; 4. a solid-liquid separation device; 5. a condenser group; 6. a heat supply network water inlet; 7. a heat supply network water outlet; 8. a heat source inlet pipeline; 9. a heat source outlet line; 10. and (4) introducing wastewater into a pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The terms "first," "second," and the like in the description and claims of the present invention and in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements but may alternatively include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the utility model. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein may be combined with other embodiments.
It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The utility model will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
In this embodiment, a thermal power plant wastewater treatment system is provided, including a heat pump, a flash bank, and a heater. The heat pump includes a first heat source inlet and a first heat source outlet in communication with the first heat source inlet, and a second heat source inlet and a second heat source outlet in communication with the second heat source inlet. The liquid inlet of the flash evaporator group is communicated with the wastewater inlet pipe, and the steam outlet of the flash evaporator group is communicated with the first heat source inlet. The heater comprises a third heat source inlet and a third heat source outlet communicated with the third heat source inlet, the third heat source inlet is communicated with the second heat source inlet, and the third heat source outlet is communicated with the second heat source outlet;
wherein, the liquid inlet of flash vessel group communicates with the liquid outlet of heater, and the heater is used for heating the waste water that flows in by the liquid inlet of heater, and flash vessel group is configured as the steam that provides through steam outlet and is regarded as the first heat source of heat pump, to the flow through the heat supply network water of heat pump heats.
In some embodiments, the heat pump is an absorption heat pump or an absorption heat pump unit, and the thermal power plant wastewater treatment system further comprises a condenser set. The liquid inlet of the condenser group is communicated with the waste water inlet pipe, and the liquid outlet of the condenser group is communicated with the liquid inlet of the heater. Wherein, the condenser group includes N condensers, and it comprises 1 st level condenser, 2 nd level condenser … … nth level condenser, and 1 st level condenser is to nth level condenser order intercommunication in proper order, and 1 st level condenser inlet and waste water advance the pipe intercommunication, and the liquid outlet of nth level condenser and the inlet of heater communicate. The flash evaporator group comprises N +1 flash evaporators, and the flash evaporator group comprises a 0 th-stage flash evaporator, a 1 st-stage flash evaporator and a … … nth-stage flash evaporator, the nth-stage flash evaporators are sequentially communicated with the 0 th-stage flash evaporator, a liquid inlet of the nth-stage flash evaporator is communicated with a liquid outlet of the heater, a liquid outlet of the 0 th-stage flash evaporator is used for discharging wastewater, wherein N is more than or equal to 1.
In other embodiments, the steam outlets corresponding to the N flash evaporators are in one-to-one correspondence with the steam inlets corresponding to the N condensers. And steam outlets corresponding to the Nth-stage flash evaporator to the 1 st-stage flash evaporator are correspondingly communicated with steam inlets corresponding to the Nth-stage condenser to the 1 st-stage condenser, and a steam outlet of the 0 th-stage flash evaporator is communicated with the first heat source inlet.
Similarly, the 1 st-M stage condensers are respectively provided with a condensed water inlet, and the N condensers are respectively provided with a condensed water outlet. Wherein M is more than or equal to 1 and less than N, a condensed water inlet of the Mth-level condenser is communicated with a condensed water outlet of the M + 1-level condenser, and a condensed water outlet of the 1 st-level condenser is communicated with a first heat source outlet.
FIG. 1 is a schematic structural diagram of a wastewater treatment system of a thermal power plant according to a first embodiment of the present invention.
As shown in fig. 1, in this embodiment, the wastewater may be concentrated brine, and the concentrated brine to be treated is communicated with the liquid inlet of the condenser group 3 through a wastewater inlet pipe 10. The condenser group 3 includes N condensers, which are a first-stage condenser 501, a second-stage condenser 502, … …, and an nth-stage condenser 50N, respectively. First stage condenser 501 includes an inlet port 201 and an outlet port 211, second condenser 502 includes an inlet port 202 and outlet ports 212, … … and nth stage condenser 50N includes an inlet port 20N and an outlet port 21N. The waste water inlet pipe 10 is communicated with the liquid inlet 201 of the first-stage condenser 501, the liquid outlet 211 of the first-stage condenser 501 is communicated with the liquid inlet 202 of the second-stage condenser 502, … …, and the liquid outlet 21N of the Nth-stage condenser 50N is communicated with the liquid inlet 11 of the heater 2.
Further, the N condensers are sequentially communicated in sequence, it can also be understood that, in the direction of the flow of the concentrated brine, the 1 st-stage condenser 501, the 2 nd-stage condensers 502 and … …, and the nth-stage condenser 50N are arranged from low to high according to the working pressure, the first-stage condenser 501 to the nth-stage condenser 50N are sequentially connected, the concentrated brine sequentially passes through the condensers of each stage to be heated step by step, and the concentrated brine after being heated step by step flows into the liquid inlet 11 of the heater 2 through the liquid outlet 21N of the nth-stage condenser 50N.
The second heat source inlet 801 of the heat pump 1 is communicated with the heat source inlet pipeline 8 of the heat pump 1, and the second heat source outlet 901 of the heat pump 1 is communicated with the heat source outlet pipeline 9 of the heat pump 1. The third heat source inlet 802 of the heater 2 communicates with the heat source inlet line 8, and the third heat source outlet 902 of the heater 2 communicates with the heat source outlet line 9. The concentrated brine flowing in from the liquid inlet 11 of the heater 2 is heated by the heat source entering from the third heat source inlet 802 in the heater 2 and then flows out from the liquid outlet 12 of the heater 2.
The concentrated brine flowing out after being heated by the heater 2 enters a flash evaporator group for flash evaporation, specifically, the flash evaporator group comprises N +1 flash evaporators, namely a 0 th-stage flash evaporator 300, a first-stage flash evaporator 301, second-stage flash evaporators 302 and … … and an N th-stage flash evaporator 30N, the 0 th-stage flash evaporator 300 comprises a liquid inlet 170 and a liquid outlet 180, the first-stage flash evaporator 301 comprises a liquid inlet 171 and a liquid outlet 181, and the second-stage flash evaporator 302 comprises a liquid inlet 172 and a liquid outlet 182, … … and the N th-stage flash evaporator 30N comprises a liquid inlet 17N and a liquid outlet 18N. The N +1 flash evaporators are sequentially communicated, and the Nth-stage flash evaporators 30N and … …, the second-stage flash evaporator 302, the first-stage flash evaporator 301 and the 0 th-stage flash evaporator 300 are sequentially arranged from high to low according to the working pressure in the flow direction of the concentrated brine.
Wherein, the liquid inlet 17N of the Nth stage flash evaporator 30N is communicated with the liquid outlet 12 of the heater 2, the liquid outlet 18N of the Nth stage flash evaporator 30N is communicated with the liquid inlet 17N-1 of the Nth-1 stage flash evaporator (not shown in the figure), … … and the liquid inlet 172 of the second stage flash evaporator 302 are communicated with the liquid outlet 183 of the third stage flash evaporator 303 (not shown in the figure), the liquid outlet 182 of the second stage flash evaporator is communicated with the liquid inlet 171 of the first stage flash evaporator 301, and the liquid outlet 181 of the first stage flash evaporator 301 is communicated with the liquid inlet 170 of the 0 th stage flash evaporator 300. Further, the heated concentrated brine enters the N-stage flash evaporator 30N through a liquid inlet 17N of the N-stage flash evaporator 30N for flash evaporation, the concentrated brine flashed in the N-stage flash evaporator 30N sequentially passes through the flash evaporators of all stages for flash evaporation step by step, and the concentrated brine flashed step by step is discharged through a liquid outlet 180 of the 0-stage flash evaporator 300.
The N +1 flash evaporators are provided with steam outlets, the Nth stage flash evaporator 30N comprises steam outlets 19N, … …, the second stage flash evaporator 302 comprises a steam outlet 192, the first stage flash evaporator 301 comprises a steam outlet 191, and the 0 th stage flash evaporator 300 comprises a steam outlet 190. The steam outlet 19N is communicated with the steam inlet of the Nth-stage condenser 50N, … … and the steam outlet 192 are communicated with the steam inlet of the second-stage condenser 502, and the steam outlet 191 is communicated with the steam inlet of the first-stage condenser 501. Specifically, a steam outlet of the Mth-stage flash evaporator 30M (not shown in the figure) is connected with a steam inlet of the Mth-stage condenser 50M (not shown in the figure), steam generated by the flash evaporation of the concentrated brine in the Mth-stage flash evaporator 30M enters the Mth-stage condenser 50M for condensation, and the heat released by condensation is used for heating the concentrated brine flowing through the Mth-stage condenser 50M, wherein M is more than 0 and less than or equal to N.
Further, a steam outlet 190 of the 0 th-stage flash evaporator 300 is communicated with a first heat source inlet 15 of the heat pump 1, steam flashed by the 0 th-stage flash evaporator 300 serves as a low-temperature heat source of the heat pump 1, the steam is condensed in the heat pump 1 to release heat for heating heat supply network water flowing through the heat pump 1, and the condensed water flows out through a first heat source outlet 16 of the heat pump 1.
In the above embodiments, the heat supply network pipeline is used for conveying heat supply network water, and the heat supply network pipeline comprises a heat supply network water inlet 6 and a heat supply network water outlet 7. The heat pump 1 further comprises a heat source inlet pipeline 8, wherein a part of high-temperature heat source in the heat source inlet pipeline 8 enters the heat pump 1 through a second heat source inlet 801 of the heat pump 1 to serve as a driving heat source to transfer heat generated by condensation of steam entering the first heat source inlet 15 to a heat supply network pipeline. The return water of the heat supply network flows into the heat pump 1 through the water inlet 6 of the heat supply network, is heated in the heat pump 1 and then flows out through the water outlet 7 of the heat supply network. Another part of the high-temperature heat source in the heat source water inlet pipeline 8 enters the heater 2 through the third heat source inlet 802 of the heater 2 to be used as a heating heat source of the heater 2.
As shown in fig. 5, the N condensers are further provided with steam condensate outlets, the nth-stage condenser 50N includes steam condensate outlets 22N, … …, the second-stage condenser 502 includes a steam condensate outlet 222, and the first-stage condenser 501 includes a steam condensate outlet 221. Besides the nth-stage condenser 50N, the first-stage condenser 501 to the nth-1 st-stage condenser 50N-1 are provided with steam condensate inlets, the first-stage condenser 501 includes a steam condensate inlet 231, the second-stage condenser 502 includes a steam condensate inlet 232, and the nth-1 st-stage condenser 50N-1 includes a steam condensate inlet 23N-1 (not shown in the figure). Wherein, the steam condensate inlet 231 of the first-stage condenser 501 is communicated with the steam condensate outlet 222 of the second-stage condenser 502, and so on, and the connection relationship between the steam condensate inlet and the steam condensate outlet among other condensers is not repeated. Furthermore, condensed water produced in the (M + 1) th-level condenser enters the (M) th-level condenser, is mixed with the condensed water produced in the (M) th-level condenser and then flows into the next-level condenser, wherein M is more than or equal to 1 and less than N, the condensed water flowing out of the first heat source outlet 16 of the heat pump 1 is mixed with the condensed water flowing out of the steam condensed water outlet 221 of the first-level condenser 501 and then is recycled as purified water, and the purified water is discharged through the water outlet 24.
In the embodiment of this application, the strong brine loops through condensers at different levels and is heated step by step, strong brine after heating step by step heats in passing through heater 2, and flash distillation step by step through flash vessel at different levels, steam after the flash distillation step by step gets into in the heat pump 1, heat the heat supply network pipeline in the heat pump 1 as the low temperature heat source, make can be when handling waste water, be used for heating the water in the heat supply network pipeline with the heat that consumes, can show improvement effluent treatment plant's energy utilization efficiency, wastewater treatment's cost has been reduced.
In some embodiments, the thermal power plant wastewater treatment system further comprises a solid-liquid separation device. The solid-liquid separation device comprises a first water outlet, a first water inlet and a discharge port, the first water inlet is communicated with a liquid outlet of the flash evaporator group, the first water outlet is communicated with a liquid inlet of the condenser group, and the discharge port is used for discharging solid matters of the solid-liquid separation device.
Fig. 2 is a schematic structural diagram of a device according to a second embodiment of the present invention.
The difference from the first embodiment is that in the present embodiment, the thermal power plant wastewater treatment system further includes a solid-liquid separation device 4, and the solid-liquid separation device 4 is provided with a first water inlet (not shown), a first water outlet 13 and a discharge port 14. The first water inlet of the solid-liquid separation device 4 is communicated with the liquid outlet 180 of the 0 th-stage flash evaporator 300, the first water outlet 13 of the solid-liquid separation device 4 is communicated with the liquid inlet 201 of the 1 st-stage condenser 501, and the discharge port 14 of the solid-liquid separation device 4 discharges solid salt generated by processing concentrated brine.
The present embodiment can treat the strong brine to be treated into clear liquid and solid salt by arranging the solid-liquid separation device 4.
Fig. 3 is a schematic structural diagram of an apparatus according to a second embodiment of the present invention.
The difference from the second embodiment is that in this embodiment, the wastewater inlet pipe 10 is communicated with the liquid inlet 17N of the N-th stage flash evaporator 30N, and the brine to be treated enters the N-th stage flash evaporator 30N through the wastewater inlet pipe 10 and sequentially passes through N +1 flash evaporators to be flashed step by step. It should be noted that after the strong brine after flash evaporation step by step is processed by the solid-liquid separation device 4, the generated clear liquid flows into the liquid inlet 201 of the first-stage condenser 501 through the first water outlet 13, after the clear liquid is heated step by the condenser group 3, the clear liquid is heated again by the heater 2, and the heated clear liquid and the strong brine entering from the wastewater inlet pipe 10 are mixed and flow into the flash evaporator group again.
In the embodiment of the application, compared with the first embodiment and the second embodiment, the concentrated brine to be treated does not directly enter the condenser group 3 to be heated but enters the flash evaporator for flash evaporation, so that the risk of scaling of the condenser is reduced, and the working reliability of the equipment is ensured.
In other embodiments, the thermal power plant wastewater treatment system further comprises a wastewater tank. The waste water tank comprises a second water inlet, a second water outlet, a liquid return port and a suspension liquid outlet. Wherein, the second water inlet communicates with the liquid outlet of flash evaporator group, and the second water outlet communicates with the liquid inlet of condenser group, and the turbid liquid export communicates with first water inlet, returns liquid mouth and first water outlet intercommunication.
Fig. 4 is a schematic structural diagram of an apparatus according to a third embodiment of the present invention.
The difference from the above embodiment is that in this embodiment, the thermal power plant wastewater treatment system further includes a wastewater tank 25, and the wastewater tank 25 is provided with a second water inlet 251, a second water outlet 252, a liquid return port 253, and a suspension outlet 254.
The second water inlet 251 of the waste water tank 25 is communicated with the liquid outlet 180 of the 0 th stage flash evaporator 300, and the strong brine after flash evaporation in the 0 th stage flash evaporator 300 enters the waste water tank 25 through the liquid outlet 180 and is settled in the waste water tank 25. Wherein, the suspension outlet 254 is communicated with the first water inlet of the solid-liquid separation device 4, and the suspension at the bottom of the wastewater tank 25 flows out through the suspension outlet 254 and enters the solid-liquid separation device 4. The first water outlet 13 of the solid-liquid separation device 4 is communicated with the liquid return port 253 of the waste water tank 25, clear liquid generated by the solid-liquid separation device 4 returns to the waste water tank 25 through the liquid return port 253, and salt generated by the waste water tank 25 is discharged through the discharge port 14. The second water outlet 252 of the waste water tank 25 communicates with the inlet 201 of the first stage condenser 501.
In the embodiment, the wastewater tank 25 is additionally arranged in the thermal power plant wastewater treatment system, so that the sewage treatment capacity of the solid-liquid separation device 4 can be effectively reduced, and the operation and investment cost of the thermal power plant wastewater treatment system is reduced.
In some embodiments, the thermal power plant wastewater treatment system further comprises a pretreatment device. The liquid inlet of the pretreatment device is communicated with the wastewater inlet pipe, the liquid outlet of the pretreatment device is communicated with the liquid inlet of the condenser group, and the pretreatment device is used for pretreating wastewater to be treated. Wherein the pretreatment comprises one or more of dosing, physical sedimentation, electrodialysis, reverse osmosis, forward osmosis, ultrafiltration and nanofiltration.
Fig. 6 is a schematic structural diagram of an apparatus according to a fourth embodiment of the present invention.
The difference between the above embodiments is that in the present embodiment, the thermal power plant wastewater treatment system further includes a pretreatment device 26, and the strong brine to be treated first enters the pretreatment device 26 through the wastewater inlet pipe 10, and then enters the condenser group 3 to be gradually heated after being pretreated by the pretreatment device 26. Wherein the pre-treatment device 26 comprises a liquid outlet 261, and the liquid outlet 261 of the pre-treatment device 26 is communicated with the liquid inlet 201 of the first-stage condenser 501.
The pretreatment device 26 may be one or more combinations of conventional water treatment processes such as physical settling, dosing, electrodialysis, reverse osmosis, forward osmosis, ultrafiltration, nanofiltration, and the like.
Furthermore, N condensers are integrated in the cavity, and the condensers are arranged at intervals. Wherein, separate through the baffle between the condenser of different stages, strong brine and steam condensate flow in proper order between the condenser of each stage. And/or N +1 flash evaporators are integrated in the cavity, and the flash evaporators are arranged at intervals. Wherein, the flash evaporators of different stages are separated by a clapboard, and the strong brine flows between the flash evaporators of different stages in sequence.
Furthermore, the waste water comprises strong brine, desulfurization waste water, cooling tower circulating water drainage, process drainage, boiler drainage, sewage discharged from chemical water plants and the like.
In the above embodiments, the high temperature heat source may be hot water, steam, or other various forms of heat sources.
In the above embodiment, the heat supply network water in the heat supply network pipeline may also be water to be heated, such as boiler make-up water, domestic water, etc.
The utility model has been described above with reference to embodiments thereof. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The scope of the utility model is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the utility model, and these alternatives and modifications are intended to fall within the scope of the utility model.
Claims (10)
1. A thermal power plant wastewater treatment system, comprising:
the heat pump comprises a first heat source inlet, a first heat source outlet communicated with the first heat source inlet, a second heat source outlet communicated with the second heat source inlet, a first heat source outlet communicated with the second heat source inlet, a second heat source outlet communicated with the second heat source outlet, a heat pump body and a heat pump body, wherein the heat pump body is provided with a first heat source inlet and a second heat source outlet;
A liquid inlet of the flash evaporator group is communicated with the wastewater inlet pipe, and a steam outlet of the flash evaporator group is communicated with the first heat source inlet;
the heater comprises a third heat source inlet and a third heat source outlet communicated with the third heat source inlet, the third heat source inlet is communicated with the second heat source inlet, and the third heat source outlet is communicated with the second heat source outlet;
wherein, the inlet of flash vessel group with the liquid outlet intercommunication of heater, the heater be used for by the waste water of the inlet inflow of heater heats, flash vessel group configuration is passed through the steam that steam outlet provided is right the heat supply network pipeline of heat pump heats.
2. The thermal power plant wastewater treatment system of claim 1, further comprising:
and the liquid inlet of the condenser group is communicated with the wastewater inlet pipe, and the liquid outlet of the condenser group is communicated with the liquid inlet of the heater.
3. The thermal power plant wastewater treatment system according to claim 2,
the condenser group comprises N condensers which are composed of a 1 st-stage condenser and a 2 nd-stage condenser … …, the condensers from the 1 st-stage condenser to the Nth-stage condenser are sequentially communicated, a liquid inlet of the condenser from the 1 st-stage condenser is communicated with a wastewater inlet pipe, and a liquid outlet of the condenser from the Nth-stage condenser is communicated with a liquid inlet of the heater;
The flash evaporator group comprises N +1 flash evaporators which are composed of a 0 th-stage flash evaporator, a 1 st-stage flash evaporator and a … … nth-stage flash evaporator, the flash evaporators from the nth stage to the 0 th stage are sequentially communicated, a liquid inlet of the nth-stage flash evaporator is communicated with a liquid outlet of the heater, and a liquid outlet of the 0 th-stage flash evaporator is used for discharging wastewater;
wherein N > 1.
4. The thermal power plant wastewater treatment system according to claim 3,
steam outlets corresponding to the N flash evaporators are communicated with steam inlets corresponding to the N condensers in a one-to-one correspondence manner;
and steam outlets corresponding to the flash evaporators from the Nth stage to the 1 st stage are correspondingly communicated with steam inlets corresponding to the condensers from the Nth stage to the 1 st stage, and a steam outlet of the flash evaporator from the 0 th stage is communicated with a first heat source inlet.
5. The thermal power plant wastewater treatment system according to claim 3,
condensed water inlets are formed in the 1 st-M th-stage condensers respectively, and condensed water outlets are formed in the N condensers respectively;
m is more than or equal to 1 and less than N, a condensed water inlet of the M-1 level condenser is communicated with a condensed water outlet of the M level condenser, and a condensed water outlet of the 1 level condenser is communicated with the first heat source outlet.
6. The thermal power plant wastewater treatment system of claim 2, further comprising:
solid-liquid separation equipment, including first water export, first water inlet and discharge gate, first water inlet with the liquid outlet intercommunication of flash evaporator group, first water export with the inlet intercommunication of condenser group, the discharge gate is used for discharging solid matter solid-liquid separation equipment.
7. The thermal power plant wastewater treatment system according to claim 6,
the wastewater inlet pipe is communicated with a liquid inlet of the flash evaporator group.
8. The thermal power plant wastewater treatment system of claim 6, further comprising:
the waste water tank comprises a second water inlet, a second water outlet, a liquid return port and a suspension liquid outlet;
wherein, the second water inlet with the liquid outlet intercommunication of flash evaporator group, the second water export with the inlet intercommunication of condenser group, the turbid liquid export with first water inlet intercommunication, return the liquid mouth with first water outlet intercommunication.
9. The thermal power plant wastewater treatment system of claim 2, further comprising:
the liquid inlet of the pretreatment device is communicated with the wastewater inlet pipe, the liquid outlet of the pretreatment device is communicated with the liquid inlet of the condenser group, and the pretreatment device is used for pretreating wastewater to be treated;
Wherein the pretreatment comprises one or more of dosing, physical sedimentation, electrodialysis, reverse osmosis, forward osmosis, ultrafiltration and nanofiltration.
10. The thermal power plant wastewater treatment system according to claim 1,
the power plant wastewater comprises strong brine, desulfurization wastewater, cooling tower circulating water drainage, process drainage or boiler drainage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121122994.6U CN216946290U (en) | 2021-05-24 | 2021-05-24 | Waste water treatment system of steam power plant |
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| CN202121122994.6U CN216946290U (en) | 2021-05-24 | 2021-05-24 | Waste water treatment system of steam power plant |
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