CN213060260U - Coupling evaporation concentration wastewater treatment system - Google Patents
Coupling evaporation concentration wastewater treatment system Download PDFInfo
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- CN213060260U CN213060260U CN202020486803.3U CN202020486803U CN213060260U CN 213060260 U CN213060260 U CN 213060260U CN 202020486803 U CN202020486803 U CN 202020486803U CN 213060260 U CN213060260 U CN 213060260U
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Abstract
A coupling evaporation concentration wastewater treatment system comprises an evaporation concentration tower (1), a wastewater heater (2), a steam turbine condensed water system (3), a waste heat exchanger (4), a hot medium water circulating pump (5) and a booster fan (6). The coupling evaporation concentration wastewater treatment system can utilize the steam turbine drainage waste heat or condensed water low-grade heat energy, couple air or flue gas empty tower spray evaporation concentration, improve the output of the empty tower evaporation concentration tower, reduce the flow area and volume of the evaporation concentration tower and the capacity of a matched auxiliary machine, reduce the wastewater concentration energy consumption and the operation cost, reduce the occupied area and facilitate the spatial arrangement. Meanwhile, the hot water heating system can adopt a public system mode, a flexible operation mode is provided, and the boiler can still operate when being stopped. And the hot water heating has the advantages of flexible, accurate and timely adjustment and the like.
Description
Technical Field
The utility model relates to the technical field of environmental protection, in particular to concentrated effluent disposal system of coupling evaporation.
Background
The waste heat of the low-temperature flue gas discharged by the boiler is used for carrying out evaporative concentration reduction on the waste water through the evaporative concentration tower so as to reduce the subsequent treatment amount, and the method has the advantages that the running energy consumption and the cost of the evaporative concentration are lower, and the defects that the low-temperature flue gas energy quality is low, the flue gas amount required by the evaporative concentration is large relative to the high-temperature flue gas, the flow area and the volume of the evaporative concentration tower and a flue connected with the evaporative concentration tower are large, the auxiliary machine is large, the investment is increased, the energy consumption is increased, the occupied area is large, and the space is difficult to arrange. In addition, the flow area of the flue gas channel is large, the evaporation concentration tower is difficult to be connected with two or more boiler flues to form a public system, and generally only one boiler flue can be connected, but when the boiler stops operation, the evaporation concentration tower can only stop operation without a heat source. And then, the response of the flue gas system is slow when the evaporation concentration load is adjusted, and the accuracy is poor. In addition, for a power plant, only the waste heat of the exhaust gas of the boiler is utilized, and the waste heat at the side of a steam turbine is not utilized, so that the improvement of the waste heat effect is not facilitated.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide a concentrated effluent disposal system of coupling evaporation to reduce or avoid the aforementioned technical problem.
In order to solve the technical problem, the utility model provides a coupling evaporation concentration wastewater treatment system, which comprises an evaporation concentration tower 1, a wastewater heater 2, a steam turbine condensate system 3, a waste heat exchanger 4, a heat medium water circulating pump 5 and a booster fan 6;
the device comprises an evaporation concentration tower 1 and is characterized in that a spray device 1-1 and a tower pool 1-2 for storing wastewater are sequentially arranged in the evaporation concentration tower 1 from top to bottom, an evaporation gas inlet 1-3 is formed in a tower body of the evaporation concentration tower 1 between the spray device 1-1 and the tower pool 1-2, an evaporation gas outlet 1-4 is formed above the spray device 1-1, a wastewater circulating outlet 1-5 for allowing wastewater to flow out is formed in the tower pool 1-2, the tower body of the evaporation concentration tower 1 is directly or indirectly connected with an incoming wastewater inlet 1-7, and the tower pool 1-2 is directly or indirectly connected with a concentrated solution outlet 1-8;
the booster fan 6 is provided with a booster fan inlet 6-1 and a booster fan outlet 6-2; the evaporation gas inlet 1-3 is communicated with the booster fan outlet 6-2 of the booster fan 6 through a pipeline;
the steam turbine condensate system 3 comprises a first low-pressure heater 3-1, a second low-pressure heater 3-4, a condensate pump 3-2 and a condenser hot well 3-3, wherein the first low-pressure heater 3-1 is provided with a steam turbine steam extraction inlet 3-1-1, a hydrophobic outlet 3-1-2, a condensate inlet 3-1-3 and a condensate outlet 3-1-4; the condensate pump 3-2 is provided with a condensate pump inlet 3-2-1 and a condensate pump outlet 3-2-2; the condenser hot well 3-3, the condensate pump 3-2, the second low-pressure heater 3-4 and the first low-pressure heater 3-1 are sequentially communicated through a condensate pipeline;
the waste water heater 2 is provided with a waste water channel 2-5, a hot water channel 2-6, a waste water inlet 2-1, a waste water outlet 2-2, a hot water inlet 2-3 and a hot water outlet 2-4, the waste water channel 2-5 is communicated with the waste water inlet 2-1 and the waste water outlet 2-2, and the hot water channel 2-6 is communicated with the hot water inlet 2-3 and the hot water outlet 2-4;
the waste heat exchanger 4 is provided with a hot medium water outlet 4-1, a hot medium water inlet 4-2, a heating water inlet 4-3 and a heating water outlet 4-4;
a circulating pump 1-6 and the wastewater heater 2 are directly or indirectly connected in series between the spraying device 1-1 and the wastewater circulating outlet 1-5 through a wastewater circulating pipe, wherein an outlet or an inlet of the circulating pump 1-6 is directly or indirectly communicated with the wastewater inlet 2-1 or the wastewater outlet 2-2 of the wastewater heater 2;
the hot water inlet 2-3 of the waste water heater 2 is directly or indirectly communicated with the hot water outlet 4-1 of the waste heat exchanger 4 through a pipeline, the hot water outlet 2-4 of the waste water heater 2 is directly or indirectly communicated with the hot water inlet 4-2 of the waste heat exchanger 4 through a pipeline, and the hot water circulating pump 5 is connected in series on the pipeline connecting the hot water inlet 2-3 with the hot water outlet 4-1 of the waste heat exchanger 4 or the pipeline connecting the hot water inlet 4-2 with the hot water outlet 2-4;
the heating water inlet 4-3 of the waste heat exchanger 4 is directly or indirectly communicated with the drainage outlet 3-1-2 or the condensed water outlet 3-1-4 through a pipeline; preferably, the heating water inlet 4-3 of the waste heat exchanger 4 is directly or indirectly communicated with the hydrophobic outlet 3-1-2 through a pipeline.
Preferably, the heating water outlet 4-4 of the waste heat exchanger 4 is directly or indirectly connected with any point of the condenser hot well 3-3, the condensate pump inlet 3-2-1, the second low-pressure heater 3-4, the condensate pump outlet 3-2-2, the condensate inlet 3-1-3 of the first low-pressure heater 3-1, the condensate pipeline, or other systems through a pipeline.
The tower body of the evaporation concentration tower 1 is directly or indirectly connected with incoming wastewater inlets 1-7, incoming wastewater is directly input into the evaporation concentration tower 1 through an opening on the tower body of the evaporation concentration tower 1, or is input through a channel (such as a wastewater circulating pipeline, a demister flushing pipeline and the like) communicated with the inside of the evaporation concentration tower 1 or other modes, and the incoming wastewater only needs to be sent into the evaporation concentration tower 1 and finally enters the tower pool.
The column tank 1-2 is directly or indirectly connected to a concentrated solution outlet 1-8, and includes, for example, the column tank 1-2 as the concentrated solution outlet 1-8 by directly opening a hole in the column wall of the evaporation concentration column 1, or as the concentrated solution outlet 1-8 by a passage outlet communicating with the column tank 1-2 of the evaporation concentration column 1, or as the concentrated solution outlet 1-8 by an outlet of a circulation pump (1-6), or as the concentrated solution outlet 1-8 by an outlet communicating with the wastewater circulation outlet 1-5 or a wastewater circulation line, as long as the concentrated wastewater can be discharged from the evaporation concentration column 1.
Preferably, the heating water inlet 4-3 of the waste heat exchanger 4 is directly or indirectly communicated with the condensed water outlet 3-1-4 through a pipeline; the heating water outlet 4-4 of the waste heat exchanger 4 is directly or indirectly communicated with the condensate water pipeline behind (according to the flow direction of condensate water) the condenser hot well 3-3, the condensate water pump inlet 3-2-1 or the condensate water pump outlet 3-2-2 through a pipeline.
Preferably, the coupling evaporation concentration wastewater treatment system further comprises a boiler system 5A, wherein the boiler system 5A comprises a hearth 5-1, an air preheater 5-2, a dust remover 5-3, an induced draft fan 5-4, a desulfurizing tower 5-5 and a chimney 5-6 which are sequentially connected through a flue; the desulfurization tower 5-5 is provided with a flue gas inlet 5-5-1 and a flue gas outlet 5-5-2, and the evaporated gas outlet 1-4 of the evaporation concentration tower 1 is communicated with a flue between the induced draft fan 5-4 and the chimney 5-6 through a bypass flue.
Preferably, the evaporation gas outlet 1-4 of the evaporation concentration tower 1 is communicated with the flue gas inlet 5-5-1 flue of the desulfurization tower 5-5 through a bypass flue.
Preferably, the booster fan inlet 6-1 of the booster fan 6 is communicated with the outlet flue of the induced draft fan 5-4 through a bypass flue, and a communication point is positioned on the flue between the communication point of the evaporation gas outlet 1-4 and the flue of the desulfurizing tower 5-5 flue gas inlet 5-5-1 through the bypass flue and the induced draft fan 5-4.
Preferably, the waste water heater 2 is a plate heat exchanger or a tube heat exchanger or other forms of dividing wall type heat exchangers.
Preferably, the waste heat exchanger 4 is a plate heat exchanger or a tube heat exchanger or other forms of dividing wall type heat exchangers.
The dividing wall type heat exchanger is characterized in that two media flowing in the heat exchanger perform heat exchange through a heat exchange surface of the heat exchanger but are not in mixed contact.
In order to reduce the mechanical entrainment of water droplets by the boil-off gas, a demister 1-9 is preferably provided inside the evaporative concentration tower 1 between the spray device 1-1 and the boil-off gas outlet 1-4.
Preferably, a wastewater buffer water tank is arranged between the wastewater circulating outlet 1-5 and the circulating pump 1-6, and the wastewater buffer water tank is arranged outside the evaporation concentration tower 1 or is integrated with the evaporation concentration tower 1 and is arranged below the tower pool.
Optionally, the evaporation concentration tower 1 adopts an upper and lower split structure, the part above the tower pool 1-2 of the evaporation concentration tower 1 is separately arranged from the tower pool 1-2, and the upper and lower parts are communicated.
Preferably, the number of the evaporation gas inlets 1-3 is two or more, which has the advantage of balanced air distribution and can improve the evaporation concentration efficiency.
Preferably, a first spraying device is arranged at the position of the evaporation gas inlet 1-3, and the incoming wastewater is sprayed into the evaporation concentration tower 1 through the first spraying device.
Preferably, the outlet of the circulating pump 1-6 is provided with one or more branched pulse pipes 1-6-1, and the pulse pipes 1-6-1 are directly or indirectly communicated with the tower tank 1-2.
Preferably, one or more branch concentrated solution outlet ports 1-6-2 are arranged at the outlet of the circulating pump 1-6, and the one or more branch concentrated solution outlet ports 1-6-2 are used as the concentrated solution outlet ports 1-8.
Preferably, the waste water heater 2 is provided with two or more waste water inlets 2-1 and two or more waste water outlets 2-2, the circulating pumps 1-6 are provided with two or more circulating pumps 1-6, the two or more circulating pumps 1-6 are respectively and independently connected with the waste water heater 2 (same), namely the two or more circulating pumps 1-6 are respectively and independently communicated with the waste water inlet 2-1 or the waste water outlet 2-2 of the waste water heater 2 directly or indirectly through the outlets or inlets thereof.
Further, the hot water passage 2-6 of the waste water heater 2 is a passage, and the hot water flowing through the waste water heater 2 heats waste water pumped by two or more circulating pumps 1-6 at the same time.
The utility model provides a pair of concentrated effluent disposal system of coupling evaporation can utilize the hydrophobic waste heat of steam turbine or the low-grade heat energy of condensate water, and coupling air or flue gas empty tower spray evaporative concentration can improve the output of empty tower evaporative concentration tower, reduces the through flow area and the volume of evaporative concentration tower and the capacity of supporting auxiliary engine, reduces concentrated energy consumption of waste water and running cost, reduces area, makes things convenient for the spatial arrangement. The exhaust waste heat and the drainage waste heat of the steam turbine system can be fully utilized, and the heat efficiency of the steam turbine and the heat efficiency of the whole plant can be improved. And the waste heat of the boiler exhaust smoke can be coupled and utilized, the waste heat utilization means is enriched, and the energy-saving effect is provided. Meanwhile, the hot water heating system can adopt a public system mode, a flexible operation mode can be provided, and the boiler can still operate when being stopped. In addition, the hot water heating has the advantages of flexible, accurate and timely adjustment and the like.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the coupling evaporation concentration wastewater treatment system of the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of the coupling evaporation concentration wastewater treatment system of the present invention;
FIG. 3 is a schematic structural diagram of another embodiment of the coupling evaporation concentration wastewater treatment system of the present invention;
FIG. 4 is a schematic structural diagram of another embodiment of the coupling evaporation concentration wastewater treatment system of the present invention;
FIG. 5 is a schematic structural diagram of another embodiment of the coupling evaporation concentration wastewater treatment system of the present invention;
FIG. 6 is a schematic structural diagram of another embodiment of the coupling evaporation concentration wastewater treatment system of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings. Wherein like parts are given like reference numerals. The following examples are intended to illustrate the present invention and are not intended to limit the scope of the present invention.
FIG. 1 is a schematic structural diagram of an embodiment of the coupling evaporation concentration wastewater treatment system of the present invention. As shown in fig. 1, the coupling evaporation concentration wastewater treatment system of the embodiment includes an evaporation concentration tower 1, a wastewater heater 2, a turbine condensate system 3, a waste heat exchanger 4, a hot water circulating pump 5, and a booster fan 6. The device comprises an evaporation concentration tower, and is characterized in that 1 part in the evaporation concentration tower is sequentially provided with a spray device 1-1 and a tower pool 1-2 used for storing wastewater from top to bottom, the tower body of the evaporation concentration tower 1 is arranged on the spray device 1-1 and an evaporation gas inlet 1-3 is arranged between the tower pools 1-2, an evaporation gas outlet 1-4 is arranged above the spray device 1-1, the tower pool 1-2 is provided with a wastewater circulating outlet 1-5 for wastewater to flow out, the tower body of the evaporation concentration tower 1 is directly or indirectly connected with an incoming wastewater inlet 1-7, and the tower pool 1-2 is directly or indirectly connected with a concentrated liquid outlet 1-8.
The booster fan 6 is provided with a booster fan inlet 6-1 and a booster fan outlet 6-2; the evaporation gas inlet 1-3 is communicated with the booster fan outlet 6-2 of the booster fan 6 through a pipeline.
The steam turbine condensate system 3 comprises a first low-pressure heater 3-1, a second low-pressure heater 3-4, a condensate pump 3-2 and a condenser hot well 3-3, wherein the first low-pressure heater 3-1 is provided with a steam turbine steam extraction inlet 3-1-1, a hydrophobic outlet 3-1-2, a condensate inlet 3-1-3 and a condensate outlet 3-1-4; the condensate pump 3-2 is provided with a condensate pump inlet 3-2-1 and a condensate pump outlet 3-2-2; the condenser hot well 3-3, the condensate pump 3-2, the second low-pressure heater 3-4 and the first low-pressure heater 3-1 are sequentially communicated through a condensate pipeline.
The waste water heater is provided with a waste water channel 2-5, a hot water channel 2-6, a waste water inlet 2-1, a waste water outlet 2-2, a hot water inlet 2-3 and a hot water outlet 2-4, the waste water channel 2-5 is communicated with the waste water inlet 2-1 and the waste water outlet 2-2, and the hot water channel 2-6 is communicated with the hot water inlet 2-3 and the hot water outlet 2-4.
The waste heat exchanger 4 is provided with a hot medium water outlet 4-1, a hot medium water inlet 4-2, a heating water inlet 4-3 and a heating water outlet 4-4.
A circulating pump 1-6 and the wastewater heater 2 are directly or indirectly connected in series between the spraying device 1-1 and the wastewater circulating outlet 1-5 through a wastewater circulating pipe, wherein an outlet or an inlet of the circulating pump 1-6 is directly or indirectly communicated with the wastewater inlet 2-1 or the wastewater outlet 2-2 of the wastewater heater 2.
The hot water inlet 2-3 of the waste water heater 2 is directly or indirectly communicated with the hot water outlet 4-1 of the waste heat exchanger 4 through a pipeline, the hot water outlet 2-4 of the waste water heater 2 is directly or indirectly communicated with the hot water inlet 4-2 of the waste heat exchanger 4 through a pipeline, and the hot water circulating pump 5 is connected in series on the pipeline connected with the hot water inlet 2-3 or the pipeline connected with the hot water outlet 2-4 and the hot water outlet 4-2.
The heating water inlet 4-3 of the waste heat exchanger 4 is directly or indirectly communicated with the drainage outlet 3-1-2 through a pipeline.
The waste heat exchanger 4 is used for collecting the heat of the drain waste heat or the condensed water from the steam turbine condensed water system 3, heating the heat medium water, and further heating the waste water by using the heat medium water and the waste water heater 2. Meanwhile, the function of isolating the waste water heater from the steam turbine condensate system is also achieved, so that the steam turbine condensate system is prevented from being polluted by leakage of the waste water heater.
The working process is as follows:
incoming wastewater enters the tower pool 1-2 in the evaporation concentration tower 1 through the incoming wastewater inlet 1-7, flows into the spraying device 1-1 through the wastewater inlet 2-1 of the wastewater heater 2, the wastewater channel 2-5 and the wastewater outlet 2-2 under the driving of the circulating pump 1-6, and is atomized by the spraying device 1-1 and then sprayed into the evaporation concentration tower 1 and flows downwards under the action of gravity; the evaporation gas (air or flue gas) from the booster fan 6 enters the evaporation concentration tower 1 through the evaporation gas inlet 1-3 and flows upwards through the spraying device 1-1, the evaporation gas and the wastewater perform countercurrent heat exchange in the evaporation concentration tower 1, the wastewater is partially evaporated and mixed into the evaporation gas, the humidity of the evaporation gas is increased and carries part of water vapor to flow out of the evaporation concentration tower 1 through the evaporation gas outlet 1-4, and the wastewater is concentrated and reduced due to partial evaporation and falls into the tower pool 1-2 downwards. Under the drive of the circulating pump 1-6, the wastewater is circularly evaporated for multiple times, the concentration of the wastewater is higher and lower, and the wastewater is discharged out of the evaporation concentration tower 1 through the concentrated solution outlet 1-8 when reaching a certain concentration and enters a wastewater tail end treatment system until zero emission.
Meanwhile, the water drained from the drain outlet 3-1-2 of the first low-pressure heater 3-1 of the steam turbine condensate system 3, namely the heating water, enters the waste heat exchanger 4 through the heating water inlet 4-3 and heats the heating medium water, the temperature of the heating water is reduced after heat exchange with the heating medium water, and the heating water flows out of the waste heat exchanger 4 through the heating water outlet 4-4; the hot medium water heated by the heated water flows through the hot water inlet 2-3 and the hot water channel 2-6 of the waste water heater 2 under the drive of the hot medium water circulating pump 5, the waste water flowing through the waste water channel 2-5 is heated, the hot medium water heats the waste water and cools the waste water, flows through the hot water outlet 2-4, flows through the hot medium water inlet 4-2, flows back to the waste heat exchanger 4, and circulates under the drive of the hot medium water circulating pump 5. The waste water flowing through the waste water heater 2 is heated and then sprayed into the evaporation concentration tower 1 through the spraying device 1-1, and exchanges heat with the evaporation gas, and the temperature of the evaporation gas is also increased after the waste water is heated, so that the saturation humidity of the evaporation gas is increased, the moisture carrying capacity of the evaporation concentration tower is improved, and the output of the evaporation concentration tower is improved.
The hydrophobic direction of the heated water flowing out of the heated water outlet 4-4 of the waste heat exchanger 4, i.e. the first low-pressure heater 3-1, can be one of the following ways:
(1) and the heating water outlet 4-4 of the waste heat exchanger 4 is directly or indirectly communicated with the condenser hot well 3-3 through a pipeline. The drained water of the first low-pressure heater 3-1 is subjected to heat exchange and temperature reduction through the waste heat exchanger 4, so that the vacuum of a condenser can be improved and the thermal efficiency of a steam turbine can be improved under the condition that the cooling capacity of the steam turbine condenser is certain, and the thermal efficiency of the whole plant can be further improved by utilizing the drained water waste heat of the first low-pressure heater 3-1;
(2) and the heating water outlet 4-4 of the waste heat exchanger 4 is directly or indirectly communicated with the condensate pump inlet 3-2-1 through a pipeline. Because the drainage of the first low-pressure heater 3-1 is subjected to heat exchange and temperature reduction through the waste heat exchanger 4, the temperature of condensed water at the outlet of the condensed water pump 3-2 can be reduced, according to the working principle of a turbine regenerative system, the steam extraction of the second pressurizing heater 3-4 and the turbine of the first low-pressure heater 3-1 are increased to different degrees, the steam exhaust amount of the turbine can be reduced, the loss of a cold end can be reduced, the vacuum of the condenser can be improved, and the efficiency of the turbine can be improved. In order to ensure the load of the steam turbine, the steam entering the steam turbine is increased, which is equivalent to improving the acting proportion of the high-pressure section of the steam turbine and improving the efficiency of the steam turbine. In addition, the utilization of the drain waste heat of the first low-pressure heater 3-1 can further improve the thermal efficiency of the whole plant;
(3) and the heating water outlet 4-4 of the waste heat exchanger 4 is directly or indirectly communicated with the second low-pressure heater 3-4 through a pipeline. Namely, the hydrophobic water of the first low-pressure heater 3-1 enters the next-stage low-pressure heater, namely the second low-pressure heater 3-4, and the second low-pressure heater 3-4 heats the passing condensed water. Because the drainage of the first low-pressure heater 3-1 is subjected to heat exchange and temperature reduction through the waste heat exchanger 4, the outlet condensate temperature of the second low-pressure heater 3-4 can be reduced to some extent, according to the working principle of a turbine regenerative system, the steam extraction of the second low-pressure heater 3-4 and the steam turbine of the first low-pressure heater 3-1 are increased to different degrees, the steam discharge of the steam turbine can be reduced, the loss of a cold end can be reduced, the vacuum of the steam condenser can be improved, and the efficiency of the steam turbine can be improved. In order to ensure the load of the steam turbine, the steam entering the steam turbine is increased, which is equivalent to improving the acting proportion of the high-pressure section of the steam turbine and improving the efficiency of the steam turbine. In addition, the utilization of the drain waste heat of the first low-pressure heater 3-1 can further improve the thermal efficiency of the whole plant;
(4) and the heating water outlet 4-4 of the waste heat exchanger 4 is communicated with a condensed water pipeline of the condensed water pump outlet 3-2-2 through a pipeline. This approach requires the provision of a drain pump. Namely, the hydrophobic water of the first low-pressure heater 3-1 enters the condensed water pipeline of the condensed water pump outlet 3-2-2 under the driving of the hydrophobic pump. Because the drainage of the first low-pressure heater 3-1 is subjected to heat exchange and temperature reduction through the waste heat exchanger 4, the outlet condensate temperature of the second low-pressure heater 3-4 can be reduced to some extent, according to the working principle of a turbine regenerative system, the steam extraction of the second low-pressure heater 3-4 and the steam turbine of the first low-pressure heater 3-1 are increased to different degrees, the steam discharge of the steam turbine can be reduced, the loss of a cold end can be reduced, the vacuum of the steam condenser can be improved, and the efficiency of the steam turbine can be improved. In order to ensure the load of the steam turbine, the steam entering the steam turbine is increased, which is equivalent to improving the acting proportion of the high-pressure section of the steam turbine and improving the efficiency of the steam turbine. In addition, the utilization of the drain waste heat of the first low-pressure heater 3-1 can further improve the thermal efficiency of the whole plant;
(5) the heating water outlet 4-4 of the waste heat exchanger 4 is directly or indirectly communicated with the condensed water inlet 3-1-3 of the first low-pressure heater 3-1 through a pipeline. This approach requires the provision of a drain pump. Namely, the hydrophobic water of the first low-pressure heater 3-1 enters the condensed water inlet 3-1-3 of the first low-pressure heater 3-1 under the driving of the hydrophobic pump. Because the drainage of the first low-pressure heater 3-1 is subjected to heat exchange and temperature reduction through the waste heat exchanger 4, the temperature of outlet condensate water of the first low-pressure heater 3-4 is reduced to some extent, according to the working principle of a turbine regenerative system, the steam extraction of a turbine of the first low-pressure heater 3-1 is increased to some extent, the steam discharge quantity of the turbine is reduced, the loss of a cold end is reduced, the vacuum of a condenser is improved, and the efficiency of the turbine is improved. In order to ensure the load of the steam turbine, the steam entering the steam turbine is increased, which is equivalent to improving the acting proportion of the high-pressure section of the steam turbine and improving the efficiency of the steam turbine. In addition, the utilization of the drain waste heat of the first low-pressure heater 3-1 can further improve the thermal efficiency of the whole plant;
(6) and the heating water outlet 4-4 of the waste heat exchanger 4 is connected with other systems through a pipeline.
In any case, since the waste heat of the water-repellent of the first low pressure heater 3-1 is used, the thermal efficiency of the steam turbine and the thermal efficiency of the whole plant are improved.
Fig. 2 differs from fig. 1 in that the heating water inlet 4-3 of the waste heat exchanger 4 is directly or indirectly communicated with the condensed water outlet 3-1-4 through a pipeline. Steam extracted by a steam turbine enters the first low-pressure heater 3-1 through the steam extraction inlet 3-1-1 of the steam turbine to heat the condensed water, and then flows out of the low-pressure heater 3-1 through the drainage outlet 3-1-2. And the condensed water from the condenser hot well 3-3 enters the low-pressure heater 3-1 through the condensed water inlet 3-1-3 under the driving of the condensed water pump 3-2, is heated and then flows out of the low-pressure heater 3-1 through the condensed water outlet 3-1-4. Part of the condensed water from the condensed water outlet 3-1-4 of the first low-pressure heater 3-1, that is, heated water enters the waste heat exchanger 4 through the heated water inlet 4-3 and heats the hot medium water, and the heated water and the hot medium water exchange heat, then the temperature is reduced and the heated water flows out of the waste heat exchanger 4 through the heated water outlet 4-4. The hot medium water heated by the heated water flows through the hot water inlet 2-3 and the hot water channel 2-6 of the waste water heater 2 under the drive of the hot medium water circulating pump 5, the waste water flowing through the waste water channel 2-5 is heated, the hot medium water heats the waste water and cools the waste water, flows through the hot water outlet 2-4, flows through the hot medium water inlet 4-2, flows back to the waste heat exchanger 4, and circulates under the drive of the hot medium water circulating pump 5. The waste water flowing through the waste water heater 2 is heated and then sprayed into the evaporation concentration tower 1 through the spraying device 1-1, and exchanges heat with the evaporation gas, and the temperature of the evaporation gas is also increased after the waste water is heated, so that the saturation humidity of the evaporation gas is increased, the moisture carrying capacity of the evaporation concentration tower is improved, and the output of the evaporation concentration tower is improved.
The hydrophobic direction of the heated water flowing out of the heated water outlet 4-4 of the waste heat exchanger 4, i.e. the first low-pressure heater 3-1, can be one of the following ways:
(1) and the heating water outlet 4-4 of the waste heat exchanger 4 is directly or indirectly communicated with the condenser hot well 3-3 or the condensate pump inlet 3-2-1 through a pipeline. In order to maintain the outlet condensate temperature of the condensate outlet 3-1-4 of the first low pressure heater 3-1 and the condensate flow rate entering the turbine system (the total amount of condensate flowing through the first low pressure heater 3-1 minus the flow rate of heating water entering the waste heat exchanger 4) substantially constant, thereby keeping the turbine load constant, it is necessary to increase the flow rate and increase the steam extraction of the turbine by the condensate pump 3-2. The low-pressure heater 3-1 is equivalent to an additional turbine exhaust waste heat exchanger and a circulation loop which take the extracted steam increased by the turbine as a heating medium, take the condensate flow increased by the first low-pressure heater 3-1, namely heating water, as a heated medium and take the condensate pump 3-2 as a driving circulation pump, namely a parasitic waste heat exchanger circulation loop. According to the operating principle of a turbine regenerative system, low-pressure steam extraction of each stage of the turbine is increased in different degrees, the steam discharge capacity of the turbine is reduced, the loss of a cold end is reduced, the vacuum of a condenser is improved, and the efficiency of the turbine is improved. In order to ensure the load of the steam turbine, the steam entering the steam turbine is increased, which is equivalent to improving the acting proportion of the high-pressure section of the steam turbine and improving the efficiency of the steam turbine. In addition, the utilization of the drain waste heat of the first low-pressure heater 3-1 can further improve the thermal efficiency of the whole plant;
(2) the heating water outlet 4-4 of the waste heat exchanger 4 is directly or indirectly communicated with a condensed water pipeline behind (according to the flow direction of condensed water) the condensed water pump outlet 3-2-2 through a pipeline. And the condensed water pipeline behind the outlet 3-2-2 of the condensed water pump comprises a condensed water pipeline from the outlet 3-2-2 of the condensed water pump to the deaerator. In this way, a heating water circulating pump (not shown) is required to be added to ensure that the heating water from the heating water outlet 4-4 can be pumped into the condensate pipeline behind the condensate pump outlet 3-2-2. The low-pressure heater through which heating water flows is provided with an additional turbine exhaust waste heat exchanger and a circulation loop, wherein the additional turbine exhaust waste heat exchanger takes extracted steam increased by a turbine as a heating medium, heating water as a heated medium and a heating water circulating pump as a driving circulating pump, and the circulation loop is a parasitic waste heat exchanger circulation loop. According to the working principle of a turbine regenerative system, because the flow of heated media flowing through the inside of each stage of low-pressure heater for heating water is increased, the low-pressure extraction steam of each stage of turbine also can be increased in different degrees, the steam discharge of the turbine can be reduced, the loss of a cold end can be reduced, the vacuum of a condenser can be improved, and the efficiency of the turbine can be improved. In order to keep the load of the steam turbine unchanged, the steam entering the steam turbine is increased, which is equivalent to improving the work ratio of the high-pressure section of the steam turbine and improving the efficiency of the steam turbine. In addition, the utilization of the drain waste heat of the first low-pressure heater 3-1 can further improve the thermal efficiency of the whole plant;
(3) and the heating water outlet 4-4 of the waste heat exchanger 4 is connected with other systems through a pipeline.
In any form, the low-grade heat energy of the condensed water of the first low-pressure heater 3-1 is utilized to improve the heat efficiency of the steam turbine and the heat efficiency of the whole plant due to the fact that the steam extraction proportion of the low-pressure section of the steam turbine is increased.
The steam turbine condensate system 3 may be a unit system unit associated with the boiler system 5A, or may be another unit.
FIG. 3 is a schematic structural diagram of another embodiment of the coupling evaporation concentration wastewater treatment system of the present invention. As shown in fig. 3, on the basis of the coupled evaporative concentration wastewater treatment system shown in fig. 1, the coupled evaporative concentration wastewater treatment system further comprises a boiler system 5A, wherein the boiler system 5A comprises a hearth 5-1, an air preheater 5-2, a dust remover 5-3, an induced draft fan 5-4, a desulfurizing tower 5-5 and a chimney 5-6 which are sequentially connected through a flue; the desulfurizing tower 5-5 is provided with a flue gas inlet 5-5-1 and a flue gas outlet 5-5-2. And the evaporation gas outlet 1-4 of the evaporation concentration tower 1 is communicated with a flue between the induced draft fan 5-4 and the chimney 5-6 through a bypass flue. Therefore, the evaporation gas with increased humidity after the waste water is evaporated can be discharged into the chimneys 5-6 through the evaporation gas outlets 1-4 and the flues so as to avoid the influence of the evaporation gas on the local environment. When the boiler is stopped, the suction effect of the chimneys 5-6 can be used to increase the output of the evaporative concentration tower 1. In this embodiment, the evaporation gas outlet 1-4 of the evaporation concentration tower 1 is communicated with the flue gas inlet 5-5-1 flue of the desulfurization tower 5-5 through a bypass flue. Therefore, when the evaporation gas is flue gas, the flue gas can be desulfurized by the desulfurizing tower 5-5 and then discharged into the chimney 5-6.
FIG. 4 is a schematic structural diagram of another embodiment of the coupling evaporation concentration wastewater treatment system of the present invention. As shown in fig. 4, the booster fan inlet 6-1 of the booster fan 6 is communicated with the outlet flue of the induced draft fan 5-4 through a bypass flue, and a communication point is located on the flue between the communication point of the evaporation gas outlet 1-4 with the inlet flue of the desulfurization tower 5-5 through the bypass flue and the induced draft fan 5-4. Therefore, the waste water can be evaporated by utilizing the flue gas after the draught fan 5-4, and the output of the evaporation concentration tower can be further improved due to the fact that the flue gas temperature is high and the evaporation capacity is high. In this case, the evaporation gas outlet 1-4 of the evaporation concentration tower 1 must be communicated with the flue gas inlet 5-5-1 flue of the desulfurization tower 5-5 through a bypass flue so as to ensure that the flue gas enters the chimney 5-6 after being desulfurized.
FIG. 5 is a schematic structural diagram of another embodiment of the coupling evaporation concentration wastewater treatment system of the present invention. As shown in FIG. 5, one or more branched pulse pipes 1-6-1 are arranged at the outlet of the circulating pump 1-6, and the pulse pipes 1-6-1 are directly or indirectly communicated with the tower tank 1-2. The device aims to divide part of the waste water at the outlet of the circulating pump 1-6 to be pumped into the tower tank 1-2 and blow the waste water in the tower tank 1-2 so as to reduce the precipitation, has the advantages of ensuring the normal operation of the circulating pump, replacing a stirrer or a pulsating water pump, saving the investment and improving the operation reliability.
One or more branch concentrated solution discharge ports 1-6-2 are arranged at the outlet of the circulating pump 1-6, and the one or more branch concentrated solution discharge ports 1-6-2 are used as the concentrated solution outlet 1-8.
FIG. 6 is a schematic structural diagram of another embodiment of the coupling evaporation concentration wastewater treatment system of the present invention. As shown in fig. 6, the waste water heater 2 is provided with two or more waste water inlets 2-1 and two or more waste water outlets 2-2, the circulating pumps 1-6 are provided with two or more circulating pumps 1-6, and the two or more circulating pumps 1-6 are respectively and independently connected in series with the same waste water heater 2, i.e. the two or more circulating pumps 1-6 are respectively and independently communicated with the waste water inlet 2-1 or the waste water outlet 2-2 of the waste water heater 2 through the outlets or inlets thereof. Its advantages are low cost and less occupied space. Furthermore, the hot water channel 2-6 of the waste water heater 2 is a channel, that is, the hot water flowing through the waste water heater 2 simultaneously heats the pumped waste water of the two circulating pumps 1-6, so that the heat exchange capability can be improved, the heat exchange area can be reduced, the system reliability can be improved, and the construction cost can be reduced.
A demister 1-9 is arranged between the spray device 1-1 and the outlet of the evaporation gas outlet 1-4 in the evaporation concentration tower 1.
In addition, a wastewater buffer tank can be arranged between the wastewater circulating outlet 1-5 and the circulating pump 1-6, and the wastewater buffer tank can be arranged outside the evaporation concentration tower 1 or integrated with the evaporation concentration tower 1 and arranged below the tower pool.
The concentration tower 1 can adopt an upper and lower split structure, and the part above the tower pool 1-2 of the evaporation concentration tower 1 and the tower pool 1-2 are separately arranged and the upper part and the lower part are communicated.
The evaporation gas inlets 1-3 can be two or more, which has the advantages of balanced air distribution and improved evaporation concentration efficiency.
The heating water outlet 4-4 of the waste heat exchanger 4 can be communicated with other low-pressure heaters or condensed water pipelines or a condenser hot well through a pipeline, and the specific scheme can be determined according to the actual condition of a steam turbine system.
A first spraying device is arranged at the position of the evaporation gas inlet 1-3, and incoming wastewater enters the evaporation concentration tower 1 through the first spraying device. Because the incoming material wastewater concentration is low, the first spraying device can adopt a nozzle with smaller atomization granularity, and meanwhile, because the temperature of the evaporation gas at the evaporation gas inlet 1-3 is high, the evaporation efficiency can be improved.
Claims (14)
1. A coupling evaporation concentration wastewater treatment system is characterized by comprising an evaporation concentration tower (1), a wastewater heater (2), a steam turbine condensate system (3), a waste heat exchanger (4), a heat medium water circulating pump (5) and a booster fan (6);
the device comprises an evaporation concentration tower (1), wherein a spray device (1-1) and a tower pool (1-2) for storing wastewater are sequentially arranged in the evaporation concentration tower (1) from top to bottom, an evaporation gas inlet (1-3) is formed in a tower body of the evaporation concentration tower (1) between the spray device (1-1) and the tower pool (1-2), an evaporation gas outlet (1-4) is formed above the spray device (1-1), a wastewater circulating outlet (1-5) for flowing out wastewater is formed in the tower pool (1-2), the tower body of the evaporation concentration tower (1) is directly or indirectly connected with an incoming wastewater inlet (1-7), and the tower pool (1-2) is directly or indirectly connected with a concentrated solution outlet (1-8);
the booster fan (6) is provided with a booster fan inlet (6-1) and a booster fan outlet (6-2); the evaporation gas inlet (1-3) is communicated with the booster fan outlet (6-2) of the booster fan (6) through a pipeline;
the steam turbine condensate water system (3) comprises a first low-pressure heater (3-1), a second low-pressure heater (3-4), a condensate pump (3-2) and a condenser hot well (3-3), wherein the first low-pressure heater (3-1) is provided with a steam turbine steam extraction inlet (3-1-1), a hydrophobic outlet (3-1-2), a condensate water inlet (3-1-3) and a condensate water outlet (3-1-4); the condensate pump (3-2) is provided with a condensate pump inlet (3-2-1) and a condensate pump outlet (3-2-2); the condenser hot well (3-3), the condensate pump (3-2), the second low-pressure heater (3-4) and the first low-pressure heater (3-1) are sequentially communicated through a condensate pipeline;
the waste water heater (2) is provided with a waste water channel (2-5), a hot water channel (2-6), a waste water inlet (2-1), a waste water outlet (2-2), a hot water inlet (2-3) and a hot water outlet (2-4), the waste water channel (2-5) is communicated with the waste water inlet (2-1) and the waste water outlet (2-2), and the hot water channel (2-6) is communicated with the hot water inlet (2-3) and the hot water outlet (2-4);
the waste heat exchanger (4) is provided with a hot medium water outlet (4-1), a hot medium water inlet (4-2), a heating water inlet (4-3) and a heating water outlet (4-4);
a circulating pump (1-6) and the wastewater heater (2) are directly or indirectly connected in series between the spraying device (1-1) and the wastewater circulating outlet (1-5) through a wastewater circulating pipe, wherein the outlet or the inlet of the circulating pump (1-6) is directly or indirectly communicated with the wastewater inlet (2-1) or the wastewater outlet (2-2) of the wastewater heater (2);
the hot water inlet (2-3) of the waste water heater (2) is directly or indirectly communicated with the hot water outlet (4-1) of the waste heat exchanger (4) through a pipeline, the hot water outlet (2-4) of the waste water heater (2) is directly or indirectly communicated with the hot water inlet (4-2) of the waste heat exchanger (4) through a pipeline, and the hot water circulating pump (5) is connected in series on the pipeline connecting the hot water outlet (4-1) of the waste heat exchanger (4) with the hot water inlet (2-3) or the pipeline connecting the hot water inlet (4-2) with the hot water outlet (2-4);
the heating water inlet (4-3) of the waste heat exchanger (4) is directly or indirectly communicated with the drainage outlet (3-1-2) or the condensed water outlet (3-1-4) through a pipeline.
2. The coupled evaporative concentration wastewater treatment system according to claim 1, wherein the heating water outlet (4-4) of the waste heat exchanger (4) is connected to the condenser hot well (3-3), or the condensate pump inlet (3-2-1), or the second low pressure heater (3-4), or the condensate pump outlet (3-2-2), or the condensate inlet (3-1-3) of the first low pressure heater (3-1), or any point of the condensate pipeline, or other systems through a pipeline.
3. The coupling evaporation concentration wastewater treatment system according to claim 1, further comprising a boiler system (5A), wherein the boiler system (5A) comprises a hearth (5-1), an air preheater (5-2), a dust remover (5-3), an induced draft fan (5-4), a desulfurizing tower (5-5) and a chimney (5-6) which are sequentially connected through a flue; desulfurizing tower (5-5) are provided with flue gas inlet (5-5-1) and exhanst gas outlet (5-5-2), evaporative concentration tower (1) evaporative gas export (1-4) through the bypass flue with draught fan (5-4) extremely flue intercommunication between chimney (5-6).
4. The coupling evaporative concentration wastewater treatment system according to claim 3, wherein the evaporative gas outlet (1-4) of the evaporative concentration tower (1) is communicated with the flue gas inlet (5-5-1) flue of the desulfurization tower (5-5) through a bypass flue, the booster fan inlet (6-1) of the booster fan (6) is communicated with the outlet flue of the induced draft fan (5-4) through a bypass flue, and the communication point is located on the flue between the evaporative gas outlet (1-4) and the flue gas inlet (5-5-1) flue of the desulfurization tower (5-5) through a bypass flue and the induced draft fan (5-4).
5. The coupled evaporative concentration wastewater treatment system as set forth in any of claims 1 to 4, wherein the wastewater heater (2) and the waste heat exchanger (4) are each independently a plate heat exchanger, a tube heat exchanger, or other forms of dividing wall heat exchangers.
6. The coupled evaporative concentration wastewater treatment system according to any of claims 1 to 4, wherein a demister (1-9) is provided inside the evaporative concentration tower (1) between the spray device (1-1) and the evaporative gas outlet (1-4).
7. The coupled evaporative concentration wastewater treatment system according to any of claims 1 to 4, wherein a wastewater buffer tank is provided between the wastewater circulation outlet (1-5) and the circulation pump (1-6), and the wastewater buffer tank is provided outside the evaporative concentration tower (1) or is integrated with the evaporative concentration tower (1) and is provided below the tower pool.
8. The coupled evaporative concentration wastewater treatment system as set forth in any one of claims 1 to 4, wherein a first spraying device is provided at the evaporative gas inlet (1-3), and the incoming wastewater is sprayed into the evaporative concentration tower (1) through the first spraying device.
9. The coupling evaporation concentration wastewater treatment system according to any one of claims 1 to 4, wherein the evaporation concentration tower (1) adopts a split structure, the part above the tower pool (1-2) of the evaporation concentration tower (1) is separated from the tower pool (1-2), and the upper part and the lower part are communicated.
10. The coupled evaporative concentration wastewater treatment system as set forth in any one of claims 1 to 4, wherein the number of the evaporative gas inlets (1-3) is two or more.
11. The coupled evaporative concentration wastewater treatment system as set forth in any of claims 1 to 4, wherein the outlet of the circulation pump (1-6) is provided with one or more branched pulse pipes (1-6-1), and the pulse pipes (1-6-1) are directly or indirectly communicated with the tower (1-2).
12. The coupled evaporative concentration wastewater treatment system according to any of claims 1 to 4, wherein one or more branch concentrated solution discharge ports (1-6-2) are provided at the outlet of the circulation pump (1-6), and the one or more branch concentrated solution discharge ports (1-6-2) are used as the concentrated solution outlet (1-8).
13. The coupled evaporative concentration wastewater treatment system according to any one of claims 1 to 4, wherein the wastewater heater (2) is provided with two or more wastewater inlets (2-1) and two or more wastewater outlets (2-2), the circulating pumps (1-6) are provided with two or more circulating pumps (1-6), and the two or more circulating pumps (1-6) are respectively and independently connected in series with the same wastewater heater (2), i.e. the two or more circulating pumps (1-6) are respectively and independently communicated with the wastewater inlets (2-1) or the wastewater outlets (2-2) of the same wastewater heater (2) through the outlets or inlets thereof.
14. The coupled evaporative concentration wastewater treatment system as set forth in claim 13, wherein the hot water passage (2-6) of the wastewater heater (2) is a passage, and the hot water flowing through the wastewater heater (2) heats the wastewater pumped by two or more circulating pumps (1-6) at the same time.
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| CN202020486803.3U CN213060260U (en) | 2020-04-03 | 2020-04-03 | Coupling evaporation concentration wastewater treatment system |
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