CN114314716A - High-efficient wall adhesion-preventing desulfurization waste water drying treatment system - Google Patents
High-efficient wall adhesion-preventing desulfurization waste water drying treatment system Download PDFInfo
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- CN114314716A CN114314716A CN202111644847.XA CN202111644847A CN114314716A CN 114314716 A CN114314716 A CN 114314716A CN 202111644847 A CN202111644847 A CN 202111644847A CN 114314716 A CN114314716 A CN 114314716A
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Abstract
The invention provides a high-efficiency wall-sticking-preventing desulfurization wastewater drying treatment system. Comprises a desulfurization waste water storage system, a heating system, a water temperature controller, a drying tower, a high-temperature flue gas channel and a dust remover. The desulfurization waste water storage system is used for storing desulfurization waste water; the inlet of the heating system is the original concentrated desulfurization wastewater, and the outlet is the heated desulfurization wastewater; the water temperature controller is connected with an outlet heat source of the heating system; the inlet at the upper part of the drying tower is connected with a high-temperature flue gas flue, and the outlet at the lower part of the drying tower is connected with the inlet of a boiler dust collector. The invention provides a high-efficiency anti-sticking wall desulfurization wastewater drying treatment system, which is used for heating desulfurization wastewater to a critical temperature range and then spraying the desulfurization wastewater into a drying tower. The time of the evaporation and gasification of the desulfurization waste water is shortened, the rapid and complete evaporation and drying of the desulfurization waste water are ensured, the wall of the drying tower cannot be stained, and the stable operation of the power plant desulfurization waste water drying system is ensured.
Description
Technical Field
The invention relates to the field of high-temperature flue gas drying treatment of desulfurization wastewater, in particular to a high-efficiency wall-sticking-preventing desulfurization wastewater drying treatment system.
Background
The wet desulphurization technology is widely applied to the flue gas treatment of coal-fired boilers, most of the desulfurizer is limestone or lime, but the technology can generate a large amount of desulphurization wastewater in the operation process, the desulphurization wastewater treatment system put into the existing power plant can not effectively treat the water quality and the water quantity, the treated water can not reach the recycling standard, and the desulphurization wastewater with large pollution can not be used everywhere. The treated discharge can not meet the requirements of resource utilization and ecological protection at the present stage in China.
At present, the desulfurization wastewater treatment process is mainly concentrated and then solidified, and the most common and most economical solidification treatment is spray drying of a bypass flue. The bypass flue spray drying method is simple in system, low in running cost due to the utilization of denitrated flue gas and promising in zero-emission solidification method of wastewater. However, the drying towers of several desulfurization wastewater drying and curing systems in the current market have the problems of incomplete drying, ash accumulation in ash hoppers and wall sticking of tower walls, so that the stable operation of the drying system is influenced.
Therefore, a high-temperature flue gas evaporation and desulfurization wastewater treatment system which can be quickly dried, evaporated and thoroughly dried in a drying tower and does not cause wall adhesion and bottom ash deposition on the tower wall is needed.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a high-efficiency anti-sticking wall desulfurization wastewater drying treatment system.
In order to achieve the purpose, the invention adopts the following technical scheme: a high-efficiency anti-sticking wall desulfurization wastewater drying treatment system comprises a desulfurization wastewater storage system, a heating system, a water temperature controller, a drying tower, a high-temperature flue gas channel and a dust remover; the water temperature controller is connected with the heating system; an upper inlet of the drying tower is connected with the high-temperature flue gas flue, and a lower outlet of the drying tower is connected with an inlet of the dust remover; the flue gas in the high-temperature flue gas flue is from dust-containing hot flue gas after the denitration device; the ash-containing flue gas in the dust remover is the ash-containing flue gas after the high-temperature flue gas is dried.
Preferably, the heating system consists of a steam coil heating device and a first pump; the water temperature controller is respectively connected with the steam coil heating device and the heating source.
Preferably, the heating system consists of an electric heating device and a second pump.
Preferably, the heating system consists of a heat exchanger device; the heat exchanger device is connected with the drying tower; the heating heat source of the heat exchanger device is steam. .
Preferably, the heating system consists of a concentrated water tank, a third pump and a steam heating ejector; the concentrated water tank is connected with the inlet end of the third pump; the steam heating ejector is connected with the outlet port end of the third pump; the steam heating ejector is connected with the drying tower.
Compared with the prior art, the invention has the beneficial effects that:
(1) the desulfurization waste water is heated to a critical gasification temperature range in advance before entering a drying tower for evaporation and drying, and is rapidly dried and evaporated by contacting with high-temperature flue gas in a negative pressure drying tower, so that the evaporation and gasification time of the desulfurization waste water in the drying tower is reduced, the waste water is prevented from sticking a wall structure in the drying tower, the drying efficiency is high, and the tower wall of the drying tower is not sticky.
(2) The high-temperature flue gas evaporation treatment system after critical heating of desulfurization waste water is simple, effectively avoids the drying tower to stick the wall scale deposit, and no mechanical operation equipment need frequent maintenance in the drying tower simultaneously, has solved waste water zero release drying system's the operation degree of difficulty.
(3) The heating device in the high-efficiency anti-sticking wall desulfurization wastewater drying treatment system is small and occupies no land. The method can be used for a newly-built zero-discharge wastewater project, and can also be easily modified in the existing zero-discharge wastewater project, so that the problems of wall sticking and scaling of the drying tower and the like are solved.
Drawings
FIG. 1 is a diagram of a high-temperature flue gas evaporation treatment system after critical heating of desulfurization wastewater;
FIG. 2 is a diagram of a high-temperature flue gas evaporation treatment system after desulfurization wastewater is heated by a steam coil;
FIG. 3 is a diagram of a system for evaporating and treating high-temperature flue gas after desulfurization wastewater is electrically heated;
FIG. 4 is a diagram of a high-temperature flue gas evaporation treatment system after desulfurization wastewater is heated by a heat exchanger device;
FIG. 5 is a diagram of a high-temperature flue gas evaporation treatment system after desulfurization wastewater is heated by a steam jet heater.
In the figure: 1-a desulfurization waste water storage system; 2-a heating system; 3-water temperature controller; 4-a drying tower; 5-high temperature flue gas channel; 6-a dust remover; 7-steam coil heating device; 81-pump number one; 82-pump number two; 83-pump number three; 9-an electric heating device; 10-a heat exchanger device; 11-a concentrated water tank; 12-steam injection heater.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1, the invention provides a high-efficiency anti-sticking wall desulfurization wastewater drying treatment system, which comprises a desulfurization wastewater storage system 1, a heating system 2, a water temperature controller 3, a drying tower 4, a high-temperature flue gas channel 5 and a dust remover 6; the water temperature controller 3 is connected with the heating system 2; an upper inlet of the drying tower 4 is connected with the high-temperature flue gas duct 5, and a lower outlet of the drying tower 4 is connected with an inlet of a dust remover 6; the flue gas in the high-temperature flue gas channel 5 is from dust-containing hot flue gas after the denitration device; the ash-containing flue gas in the dust remover 6 is the ash-containing flue gas after the high-temperature flue gas is dried.
The desulfurization wastewater is heated to a critical gasification temperature range of the desulfurization wastewater by a heating system. The water temperature controller 3 is utilized to ensure that the wastewater is heated and controlled within the wastewater critical gasification temperature range, reduce the evaporation and gasification time of the wastewater in the drying tower, ensure the rapid drying and evaporation of the wastewater in the drying tower, avoid the wastewater from sticking a wall structure in the drying tower and ensure the long-time stable operation of the drying system. And (3) spraying the wastewater heated to the critical gasification temperature range into a drying tower, quickly evaporating and drying by high-temperature flue gas, finally introducing ash/ash-containing flue gas into electric precipitation, and introducing the evaporated water into a subsequent system along with the flue gas.
Because salt and ash content are completely dry in the high-efficient anti-sticking wall desulfurization wastewater drying treatment system drying tower, no ash can be accumulated at the bottom of the tower, and the drying system runs stably.
The drying tower after the high-efficient anti-sticking wall desulfurization waste water drying treatment system handles is difficult to the characteristics of deposition non-sticking wall, and hot flue gas adopts the dusty flue gas behind the denitrification facility, need not to adopt the hot overgrate air of boiler, can not exert an influence to boiler efficiency.
Because salt and ash content in the high-efficient anti-sticking wall desulfurization waste water drying treatment system drying tower are completely dry, salt, dust after the drying are in with hot flue gas fully contact state always, increase flue gas dwell contact time, until getting into the boiler dust remover, bring into inside salt etc. of dust remover along with the flue gas and also can fully mix with the fly ash of dust remover, can not cause the silo pump to carry and lead to fly ash to contain the inhomogeneous phenomenon of salt.
As shown in fig. 2, preferably, the heating system 2 is composed of a steam coil heating device 7 and a first pump 81; the water temperature controller 3 is respectively connected with the steam coil heating device 7 and the heating source.
The heating system 2 only needs to provide a path of steam heat source, is simple and highly reliable, has easy adjustment of heating speed, and can adjust in real time according to the amount of waste water and the steam temperature, thereby ensuring that the heated waste water is in a critical gasification temperature range.
As shown in fig. 3, the heating system 2 preferably comprises an electric heater 9 and a second pump 82.
Electric heater unit 9 sets up on desulfurization waste water pipeline, carries drying system's desulfurization waste water temperature through quantitative control, only heats the desulfurization waste water of carrying to the drying tower in, has reduced the heat demand.
As shown in fig. 4, preferably, the heating system 2 is a heat exchanger device 10; the heat exchanger device 10 is connected with the drying tower 4; the heating heat source of the heat exchanger device 10 is steam.
The heat exchanger heating can avoid the heat source and take off waste water direct contact, and the heat source form can adjust according to actual conditions, and the flexibility is better, and the operation is maintained comparatively portably.
As shown in fig. 5, preferably, the heating system 2 is composed of a concentrated water tank 11, a third pump 83 and a steam heating ejector 12; the concentrated water tank 11 is connected with the inlet end of the third pump 83; the steam heating ejector 12 is connected with the outlet port end of the third pump 83; the steam heating ejector 12 is connected to the drying tower 4.
The steam heating ejector 12 is arranged on the desulfurization waste water conveying pipeline, and the desulfurization waste water and the steam are directly mixed and heated in the steam ejection heater, so that the heat loss is reduced, and the heating efficiency is higher.
Preferably, the ash/ash-containing flue gas at the outlet of the drying tower 4 can be sent to the inlet flue of the dust remover 6 and the ash conveying system of the dust remover 6 respectively through the smoke dust separation facility, and can also be directly sent to the inlet flue of the dust remover 6 through the flue.
The outlet of the drying tower 4 can respectively send the flue gas and the ash content to an inlet flue of a dust remover and an ash conveying system of the dust remover through a smoke dust separation system, and can also directly send the dust-containing flue gas to the inlet flue of a dust remover of a boiler through a flue; when the outlet flue gas of the drying tower is used for pneumatically conveying ash, an ash hopper is not designed at the bottom of the drying tower, and a bin pump is not arranged for transferring and conveying, so that the equipment operation faults of the drying tower system are reduced, and the operation cost is reduced.
The method comprises the following specific implementation steps:
the utility model provides a high-efficient anti-sticking wall desulfurization waste water drying process system, includes dense water tank 11, No. three pump 83, steam heating sprayer 12, water temperature controller 3, drying tower 4 along liquid flow direction in proper order. Wherein the concentrated water tank 11 is connected with a third pump 83, the concentrated water tank is sent into a steam heating ejector 12 through the third pump 83 and then sprayed into the drying tower 4 through a spray gun, the inlet of the drying tower 4 is welded with a dust-containing hot flue gas flue led behind a denitration device, the drying tower 4 is internally provided with a flow guide device and a flow equalizing device, the outlet of the drying tower 4 is connected with a dead-angle-free large-radius wear-resistant elbow flange and is connected with the inlet of a dust remover through the flue.
The concentrated water tank 11 is the desulfurized wastewater concentrated by 5 times. The concentrated water tank 11 is connected with a third pump 83, the wastewater is sent into the steam jet heater through the high pressure of the third pump 83 to be mixed with high-temperature steam, the parameter of the high-temperature steam is 260-300 ℃, and the pressure is 0.4-1 MPa. The temperature of the heated desulfurization wastewater reaches a gasification critical interval when the temperature reaches normal pressure in a high-pressure pipeline environment, the temperature of the desulfurization wastewater is stably controlled by using a water temperature controller 3 and is sprayed into a drying tower 4 through a spray gun, the flow velocity of flue gas in the drying tower 4 is 1.2-1.4 m/S, and the retention time of the wastewater after contact with high-temperature flue gas is not less than 5S. The flue gas and the desulfurization wastewater flow downstream, the relative pressure in the drying tower 4 is-1500 to-2000 Pa, the wastewater at the critical gasification temperature is concentrated and enters the negative pressure drying tower 4 to be quickly gasified in a very short time, the drying efficiency is very high, the desulfurization wastewater is completely dried by the high-temperature flue gas, the inner wall of the tower body is not adhered to the wall, no dust is accumulated at the bottom of the tower body, and the operation is stable and effective.
When the high-efficiency anti-sticking wall desulfurization wastewater drying treatment system operates, a baffle door on a bypass flue connected with a flue behind a denitration device (in front of an air preheater) and a baffle door of a pneumatic ash conveying pipeline connected with an inlet of a dust remover are opened, the opening of the inlet baffle is adjusted according to the smoke temperature to control the smoke flow and the smoke temperature of outlet smoke, the smoke enters a drying tower and then fully contacts and exchanges heat with atomized desulfurization wastewater, the smoke is rapidly and completely evaporated and dried, the salinity and dust in the dust-containing smoke reaching the retention time are always in a full contact state with hot smoke until the smoke enters an electric dust remover, and the particulate matters are captured and collected in the dust remover and discharged along with fly ash.
Compared with the drying tower and method for preventing the desulfurization wastewater from being adhered to the wall and the desulfurization wastewater treatment system in patent CN 111320223A, the invention aims to solve the problem of wall adhesion of the drying tower, a tangential air inlet pipeline is additionally arranged on the wall of the drying tower, the system is complex, two vertical air flows collide to destroy a gas flow field in the original tower, the requirement on a system for adjusting the air volume of the system is high, and the operation is complicated; with the comparison utility model patent CN 2409467Y "spray dryer's sticky wall device of forced air cooling", this utility model discloses a glutinous wall problem of solving the desicator presss from both sides the cover in drying chamber outsourcing, is equipped with spiral duct in pressing from both sides the cover, and drying tower wall structure is complicated, tower self volume, weight increase, and the intermediate layer has the deposition risk.
The drying tower used in the patent is an empty tower, and the wall of the tower does not need to be additionally provided with an airflow pipeline and equipment.
Compared with the system for treating the desulfurization wastewater by coupling the low-temperature flue gas with the dry slag waste heat and the construction method thereof in the patent CN 113277585B, in order to avoid the problems of spray gun blockage and slag well wall sticking caused by too high solid content in the desulfurization wastewater, the desulfurization wastewater is subjected to conditioning and pre-settling treatment before entering an atomizing pump and a spray gun, the system is complex, and the pre-settled sludge is the concentrated conditioned sludge and can not be returned to an absorption tower, only sludge is discharged outside, and zero discharge in the true sense is not realized.
The technique used in this patent does not require the pretreatment of the SS of the desulfurization waste water/desulfurization waste water concentrate.
Compared with the patent CN 110759407A of two-stage energy-saving drying system with zero emission of desulfurization wastewater, the invention adopts a filter to remove dust from hot flue gas of a drying tower before the hot flue gas enters the drying tower so as to prevent the problem of wall sticking of the drying tower, thereby reducing the dust content of the flue gas. Not only the flue gas system is complicated, the resistance increases, and the filter still has one set of defeated grey system. The overall system is cumbersome.
The technique that this patent used, the hot flue gas system of drying usefulness is simple, need not to carry out dust removal to hot flue gas and handles.
To sum up, high-efficient anti-sticking wall desulfurization waste water drying process system is simple, effectively avoids the drying tower to glue the wall scale deposit, and no mechanical operation equipment need frequent maintenance in the drying tower simultaneously, has solved waste water zero release drying system's the operation degree of difficulty.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (5)
1. The utility model provides a high-efficient anti-sticking wall desulfurization waste water drying process system which characterized in that: the drying treatment system comprises a desulfurization wastewater storage system (1), a heating system (2), a water temperature controller (3), a drying tower (4), a high-temperature flue gas channel (5) and a dust remover (6); the water temperature controller (3) is connected with the heating system (2); an upper inlet of the drying tower (4) is connected with the high-temperature flue gas flue (5), and a lower outlet of the drying tower is connected with an inlet of a dust remover (6); the flue gas in the high-temperature flue gas flue (5) is from dust-containing hot flue gas after the denitration device; the ash-containing flue gas in the dust remover (6) is the ash-containing flue gas after the high-temperature flue gas is dried.
2. The high-efficiency anti-sticking wall desulfurization wastewater drying treatment system of claim 1, characterized in that: the heating system (2) consists of a steam coil heating device (7) and a first pump (81); the water temperature controller (3) is respectively connected with the steam coil heating device (7) and the heating source.
3. The high-efficiency anti-sticking wall desulfurization wastewater drying treatment system of claim 1, characterized in that: the heating system (2) consists of an electric heating device (9) and a second pump (82).
4. The high-efficiency anti-sticking wall desulfurization wastewater drying treatment system of claim 1, characterized in that: the heating system (2) consists of a heat exchanger device (10); the heat exchanger device (10) is connected to the drying tower (4).
5. The high-efficiency anti-sticking wall desulfurization wastewater drying treatment system of claim 1, characterized in that: the heating system (2) consists of a concentrated water tank (11), a third pump (83) and a steam heating ejector (12); the concentrated water tank (11) is connected with the inlet end of the third pump (83); the steam heating ejector (12) is connected with the outlet end of the third pump (83); the steam heating ejector (12) is connected with the drying tower (4).
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Citations (5)
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| US20130248121A1 (en) * | 2011-03-24 | 2013-09-26 | Mitsubishi Heavy Industries, Ltd. | Spray-drying device for dehydrated filtrate from desulfurization wastewater, air pollution control system and flue gas treatment method |
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| CN112607945A (en) * | 2020-12-16 | 2021-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Desulfurization wastewater zero-discharge system and method based on high-temperature and low-temperature flue gas coupling treatment |
| CN112777663A (en) * | 2019-11-11 | 2021-05-11 | 广东红海湾发电有限公司 | High chlorine waste water zero release processing system of thermal power factory |
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2021
- 2021-12-29 CN CN202111644847.XA patent/CN114314716A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130248121A1 (en) * | 2011-03-24 | 2013-09-26 | Mitsubishi Heavy Industries, Ltd. | Spray-drying device for dehydrated filtrate from desulfurization wastewater, air pollution control system and flue gas treatment method |
| CN106495385A (en) * | 2016-12-01 | 2017-03-15 | 莫比森(北京)石油天然气技术开发有限公司 | A kind of supercritical oxidation method for processing waste water |
| CN208200434U (en) * | 2018-03-21 | 2018-12-07 | 张建东 | A kind of Waste water concentrating liquid stream crystallizing and drying system of flue gas direct emission |
| CN112777663A (en) * | 2019-11-11 | 2021-05-11 | 广东红海湾发电有限公司 | High chlorine waste water zero release processing system of thermal power factory |
| CN112607945A (en) * | 2020-12-16 | 2021-04-06 | 中国华能集团清洁能源技术研究院有限公司 | Desulfurization wastewater zero-discharge system and method based on high-temperature and low-temperature flue gas coupling treatment |
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