CN212581552U - Desulfurization wastewater treatment system of power plant - Google Patents
Desulfurization wastewater treatment system of power plant Download PDFInfo
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- CN212581552U CN212581552U CN202021676352.6U CN202021676352U CN212581552U CN 212581552 U CN212581552 U CN 212581552U CN 202021676352 U CN202021676352 U CN 202021676352U CN 212581552 U CN212581552 U CN 212581552U
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Abstract
The utility model discloses a desulfurization effluent disposal system of power plant, desulfurization effluent disposal system of power plant includes boiler and evaporation plant, the boiler has the flue, the flue is equipped with the flue ash bucket, evaporation plant is including mixing chamber, cyclone and establish the waste water atomizing nozzle that is used for spraying waste water in to mixing chamber in the mixing chamber, mixing chamber has evaporation chamber flue gas entry, flying dust entry and mixture export, cyclone has the mixture entry, exhanst gas export and cyclone ash bucket, evaporation chamber flue gas entry and flue intercommunication so that the flue gas in the flue passes through in the evaporation chamber flue gas entry gets into mixing chamber, flying dust entry and flue ash bucket intercommunication so that the flying dust in the flue ash bucket passes through the flying dust entry and supply with mixing chamber in, mixing chamber's mixture export links to each other with cyclone's mixture entry. The utility model discloses a flow of power plant's desulfurization effluent disposal system treatment waste water is big, can prevent the jam and the corruption of flue.
Description
Technical Field
The utility model relates to a waste water treatment technical field specifically, relates to a desulfurization effluent disposal system of power plant.
Background
Along with the improvement of environmental protection standards, the requirement of the thermal power plant on the wastewater discharge is increasingly strict, and the wastewater discharged from the main machine side of the power plant is collected and sent to the desulfurization absorption tower for reuse. However, in the operation process of wet desulphurization, because chloride ions and heavy metal impurities contained in the fire coal enter a desulphurization system along with flue gas, and the content of the chloride ions in the slurry is higher and higher along with the circulation operation of the desulphurization slurry, the chemical reaction activity and the pH value of the slurry are influenced, and the desulphurization system equipment is corroded and damaged, so that a part of desulphurization wastewater needs to be discharged at a small flow rate regularly or discontinuously for controlling the concentration of the chloride ions in the system.
The wastewater discharged from the wet desulphurization island contains more suspended substances, metal ions, chloride ions, fluoride ions and other components, so that the suspended substances, the metal ions, the chloride ions, the fluoride ions and the like need to be treated, otherwise serious pollution accidents can be caused. In the related technology, firstly, the waste water needs to be subjected to 'triple box' process treatment, solid particles are separated out through neutralization, flocculation, precipitation, clarification and other modes, then the high-concentration salt-containing waste water is subjected to evaporation concentration, in order to reduce the pollution to the environment and reduce the cost for treating the waste water, the related technology provides that the finally concentrated waste water is sprayed into a boiler flue, and then a dust remover is utilized to capture the residual crystal salt after the waste water is evaporated from the flue gas.
SUMMERY OF THE UTILITY MODEL
The present invention is made based on the discovery and recognition by the inventors of the following facts and problems:
aiming at spraying concentrated waste water into a boiler flue through an atomizing nozzle, the related technology mainly provides that the waste water is sprayed into the flue for evaporation, evaporated water vapor and residual crystal salt after evaporation are diffused into flue gas, and then the flue gas enters a dust remover for dust removal.
The inventor finds and realizes through research that the problem that the atomization effect of the waste water is influenced by pipeline blockage, nozzle crystallization and the like when the waste water with high salt concentration is sprayed into the flue, and the actual operation effect is not good. In addition, the waste water sprayed into the flue needs a longer evaporation stroke, and the actual flue trend and structure are difficult to meet the requirements of the evaporation stroke, so that the actual effect is poor or the operation is difficult, and even the normal operation of the main heat system and the equipment side of the generator set is influenced. Moreover, the salt and the fly ash which are crystallized out enter a dust remover for dust removal, so that the problem of corrosion is easily caused.
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the embodiment of the utility model provides a desulfurization wastewater treatment system of power plant that waste water evaporation ability is strong, and the flow of handling waste water is big, still can prevent that waste water evaporation from forming the crystallized salt and taking place to harden and cause the jam and the corruption of flue.
According to the utility model discloses a desulfurization effluent disposal system of power plant that embodiment provided includes: the boiler is provided with a flue, and the flue is provided with a flue ash bucket; the evaporation device comprises a mixing chamber, a cyclone evaporator and a wastewater atomization nozzle which is arranged in the mixing chamber and used for spraying wastewater into the mixing chamber, the mixing chamber is provided with an evaporation chamber flue gas inlet, a fly ash inlet and a mixture outlet, the cyclone evaporator is provided with a mixture inlet, a flue gas outlet and a cyclone evaporator ash bucket, the evaporation chamber flue gas inlet is communicated with the flue so that flue gas in the flue can enter the mixing chamber through the evaporation chamber flue gas inlet, the fly ash inlet is communicated with the flue ash bucket so that fly ash in the flue ash bucket can be supplied into the mixing chamber through the fly ash inlet, and the mixture outlet of the mixing chamber is connected with the mixture inlet of the cyclone evaporator.
According to the utility model discloses desulfurization effluent disposal system of power plant has following beneficial effect at least:
1. utilize high temperature hot flue gas to evaporate waste water, the evaporation capacity is strong, and the flow of handling waste water is big, can satisfy the processing demand of thermal power plant's waste water.
2. The high specific heat characteristic of the high-temperature fly ash is utilized, and the high-temperature fly ash and the high-temperature flue gas jointly provide a heat source for waste water evaporation, so that the flow of bypass flue gas can be reduced, the sizes of a flue system and a cyclone evaporator are reduced, and the investment cost is reduced.
3. By utilizing the cyclone evaporator, the flue gas rotates inside, so that the evaporation residence time of waste water droplets is prolonged, and the waste water can be completely evaporated.
4. The high-temperature fly ash is introduced into the mixing chamber, the fly ash concentration in the flue gas in the mixing chamber is improved, salt evaporated and crystallized from the waste water is dispersed into the high-temperature fly ash, the aggregation of toxic crystallized salt is prevented, and the fly ash can rub and flush the adhesive adhered to the wall surfaces of the waste water atomizing nozzle and the cyclone evaporator, so that the blockage and the difficulty in ash removal are prevented.
5. Flue gas with high fly ash concentration enters the cyclone evaporator, crystal salt and fly ash in the wastewater are uniformly mixed by utilizing the cyclone separation rotation effect and are collected in the bottom ash bucket of the cyclone evaporator, so that the phenomenon that the crystal salt formed by the evaporation of the wastewater is hardened and corrodes the flue of subsequent equipment is prevented.
In some embodiments, the desulfurization wastewater treatment system further comprises a dust remover, and the inlet of the dust remover is communicated with the tail flue gas outlet of the flue and the flue gas outlet of the cyclone evaporator.
In some embodiments, an economizer is disposed in the flue, and the flue ash hopper is an economizer ash hopper located below the economizer.
In some embodiments, an outlet of the economizer hopper is connected to an economizer hopper pump, and an outlet of the economizer hopper pump is connected to a fly ash inlet of the mixing chamber.
In some embodiments, the desulfurization wastewater treatment system further comprises an air preheater, the flue comprises a steering chamber and a tail flue connected with the steering chamber, the economizer is arranged in the steering chamber, a tail flue gas outlet of the tail flue is connected with a flue gas inlet of the air preheater, and a flue gas outlet of the air preheater is connected with an inlet of the dust remover.
In some embodiments, the flue gas inlet of the evaporation cavity of the mixing chamber is communicated with the tail flue through a bypass inlet flue gas pipeline, and the flue gas outlet of the cyclone evaporator is connected with the inlet of the dust remover through a bypass flue gas outlet pipeline.
In some embodiments, the flue gas inlet of the evaporation cavity of the mixing chamber is communicated with the diversion chamber through a bypass inlet flue gas pipeline, and the flue gas outlet of the cyclone evaporator is communicated with the tail flue through a bypass flue gas outlet pipeline.
In some embodiments, the fly ash inlet of the mixing chamber is in communication with the flue via a fly ash conduit, and a fly ash diffuser is disposed within the mixing chamber and connected to the fly ash conduit for diffusing the fly ash.
Drawings
FIG. 1 is a schematic view of a desulfurization waste water treatment system according to one embodiment of the present invention.
FIG. 2 is a schematic view of a desulfurization waste water treatment system according to another embodiment of the present invention.
Fig. 3 is a schematic diagram of a flue evaporation device according to an embodiment of the present invention.
Reference numerals:
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
As shown in fig. 1-3, the desulfurization wastewater treatment system of power plant according to the embodiment of the present invention includes: a boiler 1 and an evaporation plant 11.
The boiler 1 has a flue provided with a flue ash hopper 4. The evaporation device 11 includes a mixing chamber 17, a cyclone evaporator 19, and a waste water atomizing nozzle 29 provided in the mixing chamber 17 for spraying waste water into the mixing chamber 17. The mixing chamber 17 has an evaporation chamber flue gas inlet 1701, a fly ash inlet 1702 and a mixture outlet 1703. The cyclonic evaporator 19 has a mixture inlet 18, a cyclonic evaporator flue gas outlet 1901 and a cyclonic evaporator hopper 1902. The evaporation cavity flue gas inlet 1701 is communicated with the flue so that flue gas in the flue enters the mixing chamber 17 through the evaporation cavity flue gas inlet 1701, the fly ash inlet 1702 is communicated with the flue ash bucket 4 so that fly ash in the flue ash bucket 4 is supplied into the mixing chamber 17 through the fly ash inlet 1702, the mixture outlet 1703 of the mixing chamber 17 is connected with the mixture inlet 18 of the cyclone evaporator 19, waste water is atomized into small-particle-size droplets after passing through the waste water atomizing nozzle 29 and is mixed with the flue gas and the fly ash in the mixing chamber 17 to form a mixture, and the mixture enters the mixture inlet 18 of the cyclone evaporator 19 through the mixture outlet 1703 and finally enters the cyclone evaporator 19 for rotary evaporation and precipitate separation.
According to the utility model discloses a desulfurization effluent disposal system of power plant that embodiment provided has following beneficial effect at least:
1. utilize high temperature hot flue gas to evaporate waste water, the evaporation capacity is strong, and the flow of handling waste water is big, can satisfy the processing demand of thermal power plant's waste water.
2. The high specific heat characteristic of the high-temperature fly ash is utilized, and the high-temperature fly ash and the high-temperature flue gas jointly provide a heat source for waste water evaporation, so that the flow of bypass flue gas can be reduced, the sizes of a flue system and a cyclone evaporator are reduced, and the investment cost is reduced.
3. By utilizing the cyclone evaporator, the flue gas rotates inside, so that the evaporation residence time of waste water droplets is prolonged, and the waste water can be completely evaporated.
4. The high-temperature fly ash is introduced into the mixing chamber, the fly ash concentration in the flue gas in the mixing chamber is improved, salt evaporated and crystallized from the waste water is dispersed into the high-temperature fly ash, the aggregation of toxic crystallized salt is prevented, and the fly ash can rub and flush the adhesive adhered to the wall surfaces of the waste water atomizing nozzle and the cyclone evaporator, so that the blockage and the difficulty in ash removal are prevented.
5. Flue gas with high fly ash concentration is sent to a cyclone evaporator, the cyclone separation rotation effect is utilized to uniformly mix crystallized salt and fly ash in the wastewater, and the flue gas is collected to a bottom ash bucket of the cyclone evaporator, so that the phenomenon that the crystallized salt formed by the evaporation of the wastewater is hardened and corrodes a flue of subsequent equipment is prevented.
In some embodiments, the desulfurization wastewater treatment system further comprises a dust separator 14, and the inlet of the dust separator 14 is in communication with the flue tail flue gas outlet of the flue and the cyclone evaporator flue gas outlet 1901. The dust remover 14 removes dust and purifies the final flue gas, so that the pollution of the flue gas to the environment is reduced.
As shown in fig. 1 and 2, the outlet of the dust collector 14 is connected with an induced draft fan 15. The draught fan 15 is used for distributing and adjusting the flow of flue gas in the mixing chamber 17, waste water is evaporated, suction devices such as auxiliary fans do not need to be arranged, the arrangement of a flue gas system is simplified, and the manufacturing cost of equipment is reduced.
In some embodiments, an economizer 3 is provided in the flue, and the flue ash hopper 4 is an economizer ash hopper located below the economizer 3. The direction of the flue gas is changed after the flue gas flows through the coal economizer 3, the flue gas flows horizontally from vertical direction to downward direction, and a coal economizer ash bucket is arranged at the bottom of a flue at the outlet of the coal economizer 3 by utilizing the change of the flowing direction of the flue gas, so that large-particle fly ash in the flue gas is separated and enters the flue ash bucket 4.
In some embodiments, an economizer hopper pump 5 is connected to the outlet of the economizer hopper, and the outlet of the economizer hopper pump 5 is connected to the fly ash inlet 1702 of the mixing chamber 17. The high-temperature fly ash is introduced into the mixing chamber 17, the fly ash concentration in the flue gas in the mixing chamber 17 is improved, the salt evaporated and crystallized from the waste water is dispersed into the high-temperature fly ash, the aggregation of the toxic crystallized salt is prevented, and the fly ash can rub and wash the adhesive bonded on the wall surfaces of the waste water atomizing nozzle 29 and the cyclone evaporator 19, so that the blockage and the difficulty in ash removal are prevented.
In some embodiments, the desulfurization wastewater treatment system further comprises an air preheater 12, the flue comprises a turning chamber 2 and a tail flue 8 connected with the turning chamber 2, the economizer 3 is arranged in the turning chamber 2, a tail flue gas outlet of the tail flue 8 is connected with a flue gas inlet of the air preheater 12, a flue gas outlet of the air preheater 12 is connected with an inlet of a dust remover 14, and the dust remover 14 removes dust and purifies the flue gas discharged by the air preheater 12, so that the emission standard is reached, and the pollution of the flue gas to the environment is reduced.
In some embodiments, the evaporation chamber flue gas inlet 1701 of the mixing chamber 17 communicates with the back pass 8 via a bypass inlet flue gas duct 16, and the cyclone evaporator flue gas outlet 1901 is connected to the inlet of the precipitator 14 via a bypass flue gas outlet duct 13. The medium-temperature flue gas is extracted from the tail flue 8 and is combined with high-temperature fly ash to provide a heat source for evaporating wastewater, so that the problems of low-temperature corrosion and blockage caused by the fact that the temperature of the flue gas is lower than the acid dew point can be solved, and the flue gas is mixed with the flue gas at the flue outlet of the air preheater 12 and then enters the dust remover 14, so that the subsequent operation of the dust remover 14 is not influenced.
In some embodiments, the evaporation chamber flue gas inlet 1701 of the mixing chamber 17 communicates with the turn-around chamber 2 through a bypass inlet flue gas duct 16, and the cyclone evaporator flue gas outlet 1901 communicates with the back pass 8 through a bypass flue gas outlet duct 13. High-temperature flue gas is extracted from the steering chamber 2 and used for evaporating waste water, the high-temperature flue gas after the waste water is evaporated is cooled, then enters the smoke inlet of the air preheater 12 after passing through the cyclone evaporator 19, the heat of the part of flue gas is recovered by the air preheater 12, the flow of the flue gas in the mixing chamber 17 is small due to the evaporation mode at higher temperature, and the dual advantages of simultaneously meeting the requirement of controlling the emission of NOx and not increasing the exhaust temperature of the boiler 1 are achieved.
In some embodiments, the fly ash inlet 1702 of the mixing chamber 17 communicates with the flue via the fly ash conduit 6, and a fly ash diffuser 25 is provided in the mixing chamber 17 and connected to the fly ash conduit 6 for diffusing the fly ash. The fly ash diffuser 25 makes fly ash more uniformly filled in the mixing chamber 17, so that the fly ash and the waste water droplets are more uniformly mixed, and the waste water treatment effect is improved.
In some embodiments, a bypass flue shutoff valve 9 for controlling the operation or shutoff of the bypass inlet flue gas pipeline 16 and a bypass flue regulating valve 10 for regulating the flow of flue gas entering the bypass inlet flue gas pipeline 16 are also connected in series on the bypass inlet flue gas pipeline 16. The bypass flue shutoff valve 9 can prevent the flue gas from leaking when the evaporation device 11 is not in operation; the bypass flue regulating valve 10 can regulate the flue gas flow entering the bypass inlet flue gas pipeline 16, and during operation, the flue gas flow is regulated in the same direction according to the waste water flow sprayed into the evaporation device 11, namely, when the waste water flow is increased, the opening degree of the bypass flue regulating valve 10 is increased, and vice versa.
In some embodiments, a fly ash shutoff valve 23 for controlling the opening or closing of the fly ash pipeline 6 and a fly ash regulating valve 24 for regulating the flow of fly ash into the mixing chamber 17 are also connected in series on the fly ash pipeline 6. When the evaporation apparatus 11 is not operating, the fly ash shutoff valve 23 is closed to prevent leakage of fly ash. The fly ash regulating valve 24 can be used to regulate the flow of fly ash into the bypass flue, and when the flow of wastewater injected into the bypass flue increases, the opening of the fly ash regulating valve 24 is correspondingly increased to increase the flow of fly ash into the bypass flue, and vice versa.
In some embodiments, the desulfurization wastewater treatment system further comprises a wastewater pipeline 26, an outlet of the wastewater pipeline 26 is communicated with a wastewater atomization nozzle 29 in the mixing chamber 17, and a wastewater shutoff valve 27 for controlling the opening or closing of the wastewater pipeline 26 and a wastewater regulating valve 28 for regulating the flow of wastewater into the cyclone evaporator 19 are connected in series on the wastewater pipeline 26. And the waste water regulating valve 28, the bypass flue regulating valve 10 and the fly ash regulating valve 24 are regulated simultaneously, the regulating directions of the three regulating valves are consistent, when the regulating directions are regulated to be large, the waste water evaporation output of the bypass flue can be increased, and when the regulating directions are regulated to be small, the waste water evaporation output of the bypass flue can be reduced.
In some embodiments, a denitration device 7 is further disposed in the tail flue 8. The denitration device 7 can remove nitrogen oxides in the flue gas, so that the emission standard is met, and the pollution of the flue gas to the environment is prevented.
Preferably, denitrification facility 7 is SCR denitrification facility, the utility model provides a denitrification facility 7 is not limited to this, still can be the denitrification facility in other embodiments.
Some specific exemplary power plant desulfurization wastewater treatment systems according to the present invention will be described with reference to fig. 1, which may be divided into a high temperature flue gas bypass and a medium temperature flue gas bypass according to the different positions of the bypass inlet flue gas line 16 access.
The desulfurization waste water treatment system of the power plant shown in fig. 1 is a high-temperature flue gas bypass, and as shown in fig. 1 and fig. 3, the desulfurization waste water treatment system of the power plant specifically comprises a boiler 1 and an evaporation device 11.
The boiler 1 has a flue provided with a flue ash hopper 4. The flue comprises a steering chamber 2 and a tail flue 8 connected with the steering chamber 2, a coal economizer 3 is arranged in the steering chamber 2, a flue ash hopper 4 is an economizer ash hopper positioned below the coal economizer 3, and the outlet of the economizer ash hopper is connected with an economizer ash hopper bin pump 5.
The evaporation device 11 comprises a mixing chamber 17, a cyclone evaporator 19 and a waste water atomizing nozzle 29 provided in the mixing chamber 17 for spraying waste water into the mixing chamber 17, the waste water atomizing nozzle 29 being provided between the mixture outlet 1703 of the mixing chamber 17 and the mixture inlet 18 of the cyclone evaporator 19. The waste water atomizing nozzle 29 is connected to the waste water line 26, and a waste water shut-off valve 27 for controlling the opening or closing of the waste water line 26 and a waste water regulating valve 28 for regulating the flow of waste water into the cyclone evaporator 19 are connected in series to the waste water line 26.
The mixing chamber 17 is provided with an evaporation cavity flue gas inlet 1701, a fly ash inlet 1702 and a mixture outlet 1703, the evaporation cavity flue gas inlet 1701 is communicated with the diversion chamber 2 through a bypass inlet flue gas pipeline 16, a bypass flue shutoff valve 9 for controlling the operation or the cutoff of the bypass inlet flue gas pipeline 16 and a bypass flue regulating valve 10 for regulating the flow of flue gas entering the bypass inlet flue gas pipeline 16 are further connected in series on the bypass inlet flue gas pipeline 16, and a cyclone evaporator flue gas outlet 1901 is communicated with the tail flue gas channel 8 through a bypass flue gas outlet pipeline 13. The fly ash inlet 1702 is connected with the outlet of the economizer hopper pump 5 through a fly ash pipeline 6, and the fly ash pipeline 6 is also connected in series with a fly ash shutoff valve 23 for controlling the opening or closing of the fly ash pipeline 6 and a fly ash regulating valve 24 for regulating the flow of fly ash entering the mixing cavity 17.
The cyclone evaporator 19 has a mixture inlet 18, a cyclone evaporator flue gas outlet 1901 and a cyclone evaporator 19 hopper, the evaporation chamber flue gas inlet 1701 communicating with the flue so that flue gas in the flue enters the mixing chamber 17 through the evaporation chamber flue gas inlet 1701, the fly ash inlet 1702 communicating with the flue hopper 4 so that fly ash in the flue hopper 4 is fed into the mixing chamber 17 through the fly ash inlet 1702, the mixture outlet 1703 of the mixing chamber 17 being connected to the mixture inlet 18 of the cyclone evaporator 19.
The desulfurization wastewater treatment system further comprises a dust remover 14, and an inlet of the dust remover 14 is communicated with a tail flue gas outlet of the flue and a flue gas outlet 1901 of the cyclone evaporator.
The desulfurization wastewater treatment system also comprises an air preheater 12, wherein a tail flue gas outlet of the tail flue 8 is connected with a flue gas inlet of the air preheater 12, and a flue gas outlet of the air preheater 12 is connected with an inlet of a dust remover 14.
The desulfurization wastewater treatment system of the power plant shown in the attached figure 2 is a medium-temperature flue gas bypass, and the difference between the medium-temperature flue gas bypass and the high-temperature flue gas bypass is the difference of the access positions of a bypass inlet flue gas pipeline 16.
As shown in fig. 2, the evaporation chamber flue gas inlet 1701 of the mixing chamber 17 is connected to the back pass 8 via a bypass inlet flue gas line 16, and the cyclone evaporator flue gas outlet 1901 is connected to the inlet of the dust separator 14 via a bypass flue gas outlet line 13.
The operation of some specific exemplary power plant desulfurization wastewater treatment systems according to the present invention will be described with reference to fig. 1 to 3.
The flow direction of flue gas in a flue in a boiler 1 changes through a steering chamber 2, the flue gas changes from horizontal flow to downward flow, the direction of the flue gas changes after flowing through an economizer 3, the flue gas changes from vertical downward flow to horizontal flow, the flow direction of the flue gas changes, an economizer ash bucket is arranged at the bottom of the flue at the outlet of the economizer 3 to separate large-particle fly ash in the flue gas and enter the economizer ash bucket, an economizer ash bucket bin pump 5 is arranged at the lower part of the economizer ash bucket, and high-temperature fly ash collected by the economizer ash bucket is sent into an ash bin by a positive pressure pneumatic conveying device. In addition, a branch pipe is connected from the outlet of the economizer hopper pump 5 and is used as a fly ash pipeline 6, fly ash passes through a fly ash shutoff valve 23 and a fly ash regulating valve 24 in sequence and then is conveyed into a mixing chamber 17 in the evaporation device 11, and the fly ash is dispersed in the mixing chamber 17 through a fly ash diffuser 25.
When the power plant desulfurization wastewater treatment system operates by adopting a high-temperature flue gas bypass, high-temperature flue gas is extracted from the part of the steering chamber 2, enters the mixing chamber 17 after passing through the bypass flue shutoff valve 9 and the bypass flue regulating valve 10, and the wastewater is evaporated by utilizing the heat energy of high-temperature fly ash and the flue gas.
The waste water enters the mixing chamber 17 after sequentially passing through the waste water shut-off valve 27, the waste water regulating valve 28 and the waste water atomizing nozzle 29, the waste water atomizing nozzle 29 atomizes the waste water into liquid drops with small particle sizes, the liquid drops enter the cyclone evaporator 19 to be rotated and evaporated along with the smoke, wherein the waste water atomizing nozzle 29 is arranged at a smoke introducing port of the cyclone evaporator 19, and after the waste water is sprayed, the waste water immediately enters a cylinder of the cyclone evaporator 19 along with high-temperature smoke and fly ash to be rotated and evaporated and separated from educts.
The bottom of the cyclone evaporator 19 is provided with a conical cyclone evaporator ash bucket 1902, the bottom of the cyclone evaporator ash bucket 1902 is connected with a cyclone evaporator ash bucket bin pump 20, the fly ash collected by the cyclone evaporator 19 and solid separated from the wastewater are uniformly mixed to form mixed fly ash 22, and the mixed fly ash is conveyed into an ash storehouse through a cyclone evaporator ash bucket pneumatic conveying pipeline 21, so that the fly ash concentration of a bypass flue gas outlet is reduced, and the corrosion and the abrasion to a subsequent flue and equipment are reduced.
The cyclone evaporator 19 can fully evaporate the atomized droplets of the wastewater, the separated solid particles are uniformly distributed in the mixed fly ash 22, the high-concentration fly ash not only provides energy for the evaporation of the atomized droplets of the wastewater, but also provides rotary friction power for the cyclone evaporator 19, and a viscous product and fly ash formed in the evaporation process are rubbed and washed, so that the problem of blockage is avoided.
Flue gas from the cyclone evaporator 19 enters the bypass flue gas outlet pipeline 13 through the cyclone evaporator flue gas outlet 1901 and returns to the tail flue 8 to be mixed with flue gas from the outlet of the denitration device 7, and the mixed flue gas enters the air heat exchanger 12 for heat exchange and then enters the dust remover 14 for dust removal.
As shown in fig. 1, when the power plant desulfurization wastewater treatment system operates by using a medium-temperature flue gas bypass, the evaporation cavity flue gas inlet 1701 of the mixing chamber 17 is communicated with the tail flue 8 through a bypass inlet flue gas pipeline 16, and the cyclone evaporator flue gas outlet 1901 is connected with the inlet of the dust remover 14 through a bypass flue gas outlet pipeline 13. The medium temperature flue gas is extracted from the tail flue 8, passes through the bypass flue shutoff valve 9 and the bypass flue regulating valve 10, enters the flue evaporation device 11, and evaporates the waste water by using the heat energy of the medium temperature fly ash and the flue gas.
Flue gas from the cyclone evaporator 19 enters the bypass flue gas outlet pipeline 13 through the cyclone evaporator flue gas outlet 1901 and returns to the tail flue 8 to be mixed with flue gas from the outlet of the denitration device 7, and the mixed flue gas enters the internal air heat exchanger 12 for heat exchange and then enters the dust remover 14 for dust removal.
The flue gas from the cyclone evaporator 19 enters the bypass flue gas outlet pipeline 13 through the cyclone evaporator flue gas outlet 1901 and returns to the flue at the flue outlet of the air preheater 12 to be mixed with the low-temperature flue gas at the flue outlet of the air preheater 12, and then enters the dust remover 14 for dust removal.
The utility model discloses an evaporation plant desulfurization waste water treatment's of power plant evaporation plant 11 includes mixing chamber 17, cyclone 19 and establish the waste water atomizing nozzle 29 that is used for spraying waste water in mixing chamber 17, mixing chamber 17 has the evaporation chamber flue gas entry 1701 that is used for supplying the flue gas in the boiler 1 flue to the evaporation intracavity, a fly ash entry 1702 that is used for supplying the fly ash in boiler 1 flue ash bucket 4 to the evaporation intracavity and a mixture export 1703 that is used for discharging flue gas and fly ash mixture from the evaporation intracavity, cyclone 19 has mixture entry 18, cyclone 1901 and cyclone 19 ash bucket, cyclone 19's mixture entry 18 links to each other with mixing chamber 17's mixture export 1703.
According to the utility model discloses an evaporation plant of power plant's desulfurization waste water treatment has following beneficial effect at least:
1. by utilizing the cyclone evaporator, the flue gas rotates inside, so that the evaporation residence time of waste water droplets is prolonged, and the waste water can be completely evaporated.
2. The high-temperature fly ash is introduced into the mixing chamber, the fly ash concentration in the flue gas in the mixing chamber is improved, salt evaporated and crystallized from the waste water is dispersed into the high-temperature fly ash, the aggregation of toxic crystallized salt is prevented, and the fly ash can rub and flush the adhesive adhered to the wall surfaces of the waste water atomizing nozzle and the cyclone evaporator, so that the blockage and the difficulty in ash removal are prevented.
In some embodiments, a fly ash diffuser 25 for diffusing fly ash is also provided within the evaporation chamber. The fly ash diffuser 25 makes fly ash more uniformly filled in the mixing chamber, so that the fly ash and waste water droplets are more uniformly mixed, and the waste water treatment effect is improved.
According to the utility model discloses a desulfurization waste water treatment method of power plant includes:
the flue gas in the flue of the boiler 1 and the fly ash in the flue dust hopper 4 are fed into the mixing chamber 17.
The waste water is injected into the mixing chamber 17 to form a mixture of waste water, flue gas and fly ash.
And performing cyclone evaporation separation on the mixture to obtain solid matters separated out from the fly ash and the wastewater and smoke after evaporation separation.
According to the utility model discloses a desulfurization waste water treatment method of power plant has following beneficial effect at least:
1. utilize high temperature hot flue gas to evaporate waste water, the evaporation capacity is strong, and the flow of handling waste water is big, can satisfy the processing demand of thermal power plant's waste water.
2. The high specific heat characteristic of the high-temperature fly ash is utilized, and the high-temperature fly ash and the high-temperature flue gas jointly provide a heat source for waste water evaporation, so that the flow of bypass flue gas can be reduced, the sizes of a flue system and a cyclone evaporator are reduced, and the investment cost is reduced.
3. By utilizing the cyclone evaporator, the flue gas rotates inside, so that the evaporation residence time of waste water droplets is prolonged, and the waste water can be completely evaporated.
4. The high-temperature fly ash is introduced into the mixing chamber, the fly ash concentration in the flue gas in the mixing chamber is improved, salt evaporated and crystallized from the waste water is dispersed into the high-temperature fly ash, the aggregation of toxic crystallized salt is prevented, and the fly ash can rub and flush the adhesive adhered to the wall surfaces of the waste water atomizing nozzle and the cyclone evaporator, so that the blockage and the difficulty in ash removal are prevented.
5. Flue gas with high fly ash concentration is sent to a cyclone evaporator, the cyclone separation rotation effect is utilized to uniformly mix crystallized salt and fly ash in the wastewater, and the flue gas is collected to a bottom ash bucket of the cyclone evaporator, so that the phenomenon that the crystallized salt formed by the evaporation of the wastewater is hardened and corrodes a flue of subsequent equipment is prevented.
In some embodiments, the power plant desulfurization wastewater treatment method further comprises dedusting the flue gas after the evaporation separation and the flue gas discharged from the tail flue gas outlet of the flue.
When the power plant desulfurization wastewater treatment system operates by using the medium-temperature flue gas bypass, as shown in fig. 2, in some embodiments, the flue comprises a diversion chamber 2 and a tail flue 8, the flue ash hopper 4 is an economizer ash hopper located below an economizer 3 arranged in the diversion chamber 2, fly ash in the economizer ash hopper is introduced into a mixing chamber 17, flue gas is introduced into the mixing chamber 17 from the tail flue 8, and flue gas after evaporation and separation is mixed with flue gas discharged from a tail flue gas outlet of the flue to remove dust.
When the power plant desulfurization wastewater treatment system operates by using a high-temperature flue gas bypass, as shown in fig. 1, in some embodiments, the flue comprises a turning chamber 2 and a tail flue 8, and the flue ash hopper 4 is an economizer ash hopper located below an economizer 3 arranged in the turning chamber 2, wherein flue gas is introduced into the mixing chamber 17 from the turning chamber 2, and the flue gas subjected to evaporation separation is sent into the tail flue 8 to be mixed with the flue gas in the tail flue 8 for dust removal.
In some embodiments, flue gas exiting the tail flue gas outlet of the tail stack 8 is fed to the air preheater 12 and the flue gas exiting the air preheater 12 is dedusted.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (8)
1. A desulfurization wastewater treatment system of a power plant is characterized by comprising:
the boiler is provided with a flue, and the flue is provided with a flue ash bucket;
the evaporation device comprises a mixing chamber, a cyclone evaporator and a wastewater atomization nozzle which is arranged in the mixing chamber and used for spraying wastewater into the mixing chamber, the mixing chamber is provided with an evaporation chamber flue gas inlet, a fly ash inlet and a mixture outlet, the cyclone evaporator is provided with a mixture inlet, a flue gas outlet and a cyclone evaporator ash bucket, the evaporation chamber flue gas inlet is communicated with the flue so that flue gas in the flue can enter the mixing chamber through the evaporation chamber flue gas inlet, the fly ash inlet is communicated with the flue ash bucket so that fly ash in the flue ash bucket can be supplied into the mixing chamber through the fly ash inlet, and the mixture outlet of the mixing chamber is connected with the mixture inlet of the cyclone evaporator.
2. The power plant desulfurization wastewater treatment system of claim 1, further comprising a dust remover, wherein an inlet of the dust remover is communicated with a tail flue gas outlet of the flue and a flue gas outlet of the cyclone evaporator.
3. The power plant desulfurization wastewater treatment system of claim 2, wherein an economizer is arranged in the flue, and the flue ash hopper is an economizer ash hopper positioned below the economizer.
4. The power plant desulfurization wastewater treatment system of claim 3, wherein an outlet of the economizer hopper is connected with an economizer hopper pump, and an outlet of the economizer hopper pump is connected with a fly ash inlet of the mixing chamber.
5. The power plant desulfurization wastewater treatment system according to claim 3 or 4, characterized by further comprising an air preheater, wherein the flue comprises a diversion chamber and a tail flue connected with the diversion chamber, the economizer is arranged in the diversion chamber, a tail flue gas outlet of the tail flue is connected with a flue gas inlet of the air preheater, and a flue gas outlet of the air preheater is connected with an inlet of the dust remover.
6. The power plant desulfurization wastewater treatment system of claim 5, wherein the flue gas inlet of the evaporation cavity is communicated with the tail flue through a bypass inlet flue gas pipeline, and the flue gas outlet of the cyclone evaporator is connected with the inlet of the dust remover through a bypass flue gas outlet pipeline.
7. The power plant desulfurization wastewater treatment system of claim 5, wherein the flue gas inlet of the evaporation cavity of the mixing chamber is communicated with the diversion chamber through a bypass inlet flue gas pipeline, and the flue gas outlet of the cyclone evaporator is communicated with the tail flue through a bypass flue gas outlet pipeline.
8. The desulfurization wastewater treatment system for power plants according to any one of claims 1 to 4, characterized in that a fly ash inlet of the mixing chamber is communicated with the flue through a fly ash pipeline, and a fly ash diffuser connected with the fly ash pipeline for diffusing fly ash is arranged in the mixing chamber.
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