CN109485117A - A kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system and method - Google Patents
A kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system and method Download PDFInfo
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- CN109485117A CN109485117A CN201811626874.2A CN201811626874A CN109485117A CN 109485117 A CN109485117 A CN 109485117A CN 201811626874 A CN201811626874 A CN 201811626874A CN 109485117 A CN109485117 A CN 109485117A
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- China
- Prior art keywords
- flue
- bypass
- desulfurization wastewater
- bypass flue
- evaporating column
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The present invention relates to a kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system and methods.The system comprises pass through the sequentially connected economizer of flue collector, SCR denitration device, air preheater, deduster, desulfurizing tower, bypass flue A, bypass flue B and conditioning tank, wherein: the bypass flue A is communicated with the flue collector before the air preheater and before the deduster respectively, evaporating column is set on the bypass flue A, the evaporation tower bottom is equipped with removing ash pipeline, the evaporating column inner tip is equipped with flue gas flow guide system and rotary atomizer, and the flue gas flow guide system is communicated with the bypass flue；The bypass flue B respectively with before the economizer flue collector and the bypass flue A be connected.The conditioning tank is connected with the desulfurizing tower and rotary atomizer respectively.The present invention can enter the flow and temperature of evaporation tower flue gas according to unit load flexible modulation, realize the zero-emission of desulfurization wastewater full load.
Description
Technical field
The present invention relates to a kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system and method, which utilizes height
Warm fume afterheat evaporates desulfurization wastewater, can realize the zero-emission of waste water according to the flow and temperature of unit load flexible modulation flue gas
It puts, belongs to thermal power generation energy-saving and emission-reduction field.
Background technique
The flue gas desulphurization system in thermal power plant can generate desulfurization wastewater, this waste water suspension and salt in the process of running
Content is high, and content of beary metal is also often higher than national emission standard, if direct emission can cause receiving water body seriously to pollute.
In recent years, country is increasingly stringent to the control of industrial wastewater discharge, and the zero-emission of desulfurization wastewater receives height in the industry
Pay attention to.In many zero-discharge technologies, high-temperature flue bypass evaporation technique process flow is simple, and investment is low with operating cost, at
In order to realize one of the major technique of heat-engine plant desulfurized wastewater zero discharge.The evaporating column in parallel with air preheater is arranged in the technology, from
Flue collector before air preheater draws high-temperature flue gas and enters tower body, and waste water is introduced to the rotary atomizer of tower top, and use is high-speed rotating
Waste water is atomized as fine droplet by mode, is evaporated waste water using the waste heat that flue gas carries, the solid matter of generation is finally with cigarette
Gas returns to flue collector and is captured by deduster.For unit under normal duty, the flue-gas temperature before air preheater may be up to 320 DEG C or more,
A small amount of flue gas, which only need to be extracted, so that waste water is evaporated rapidly in evaporating column.However, when unit load is lower, before air preheater
Flue-gas temperature can drop to 250-300 DEG C, and in evaporation process, the salt crust that partial moisture can be precipitated is wrapped up, it is difficult to steam in tower
It is dry, no small risk can be brought to the normal operation of follow-up equipment.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system and side
Method, the system using high-temperature flue gas waste heat evaporate desulfurization wastewater, can flexible modulation flue gas flow and temperature, realize the zero of waste water
Discharge.
In order to achieve the above object, the specific technical solution that the present invention uses is:
A kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system, including with the sequentially connected province's coal of flue collector
Device, SCR denitration device, air preheater and deduster and desulfurizing tower further include bypass flue A, bypass flue B and conditioning tank, in which:
The entrance of the bypass flue A connects the flue collector between the SCR denitration device and air preheater, the bypass cigarette
The outlet of road A connects the flue collector between the air preheater and deduster, and the bypass flue A is equipped with evaporating column；The steaming
The inner tip for sending out tower is equipped with flue gas flow guide system and rotary atomizer, the flue gas flow guide system and the bypass flue A phase
Logical, the bottom sides of the evaporating column are equipped with exhanst gas outlet, and the exhanst gas outlet is communicated with the bypass flue A；The evaporation
Removing ash pipeline is connected immediately below the bottom of tower；
The entrance of the bypass flue B connects the flue collector before the economizer, the outlet connection of the bypass flue B
The bypass flue A；
The entrance of the conditioning tank connects desulfurizing tower by desulfurization wastewater pipeline, and the outlet of the conditioning tank is useless by desulfurization
Waterpipe connects the rotary atomizer.
Further, the inlet connection of the bypass flue A is equipped with the bypass flue baffle A for adjusting aperture,
The inlet connection of the bypass flue B is equipped with the bypass flue baffle B for adjusting aperture.
Further, the tie point of the outlet of the bypass flue B and bypass flue A, which are located on bypass flue A, bypasses cigarette
Between road baffle A and flue gas flow guide system.
The evaporation of full load desulfurization wastewater flue is realized based on thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system
Method, comprising the following steps:
Step 1, the desulfurization wastewater that desulfurizing tower generates enters conditioning tank through desulfurization wastewater pipeline；
Step 2, the desulfurization wastewater of the outlet of regulating reservoir enters rotary atomizer through desulfurization wastewater pipeline, through high speed rotation
Atomization is that the waste water drop that partial size is 20-80 μm enters evaporating column；
Step 3, when unit load is in 60%THA and 60%THA or more, opening and adjusting bypass flue baffle A, sky are pre-
Part high-temperature flue gas before device in flue collector enters flue gas flow guide system through bypass flue A, is formed described in the entrance of spiral flue gas stream
Evaporating column；
When unit operating load is reduced to 60%THA or less, bypass flue baffle A and bypass flue baffle are opened simultaneously
B makes the part high-temperature flue gas before economizer import bypass flue A through bypass flue B；Due to the high temperature before the economizer
Flue-gas temperature adjusts the aperture of bypass flue baffle A and bypass flue baffle B, makes the temperature for converging rear flue gas at 350 DEG C or more
Stablize at 320 DEG C or more；Flue gas after converging enters the flue gas flow guide system, forms spiral flue gas stream and enters the evaporation
Tower；
Step 4, the spiral flue gas stream and the waste water drop are sufficiently mixed heat exchange, waste water drop in the evaporating column
It is discharged by solid particulate matter a part of rapid evaporation, generation through the removing ash pipeline of the evaporation tower bottom, another part is with cigarette
Gas is discharged from the exhanst gas outlet of evaporating column bottom end side, returns to the flue collector after the air preheater, is finally removed by described
Dirt device captures.
Further, raising or desulfurization wastewater of the unit operating load at 60% and 60% or more, with operating load
The reduction of flow reduces the aperture of bypass flue baffle A, reduces the exhaust gas volumn for entering bypass flue A by flue collector before air preheater,
Reduce the hot fume consumption of waste water evaporation；With the reduction of operating load or the reduction of desulfurization wastewater flow, increase bypass cigarette
The aperture of road baffle A improves the exhaust gas volumn for entering bypass flue A by flue collector before air preheater, it is ensured that the evaporating completely of waste water.
The invention has the benefit that
1. the present invention can enter the flue gas flow and temperature of evaporating column according to unit load flexible modulation, desulfurization wastewater is realized
The zero-emission of full load.
2. present invention process process is simple, it is not required to soften waste water and be concentrated, fume afterheat realization can be efficiently used
The zero-emission of desulfurization wastewater.
Detailed description of the invention
Fig. 1 is a kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system structural schematic diagram of the present invention；
Wherein, 1- economizer, 2-SCR denitrification apparatus, 3- air preheater, 4- deduster, 5- desulfurizing tower, 6- bypass flue A, 7-
Bypass flue baffle A, 8- evaporating column, 9- rotary atomizer, 10- flue gas flow guide system, 11- conditioning tank, 12- desulfurization wastewater pipe
Road, 13- flue collector, 14- removing ash pipeline, 15- bypass flue B, 16- bypass flue baffle B.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.
A kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system, as shown in Figure 1, including successively connecting with flue collector
Economizer 1, SCR denitration device 2, air preheater 3 and the deduster 4 and desulfurizing tower 5 connect, further includes bypass flue A6, bypass flue
B15 and conditioning tank 11, in which:
The entrance of the bypass flue A6 connects the flue collector between the SCR denitration device 2 and air preheater 3, the side
The outlet of road flue A6 connects the flue collector between the air preheater 3 and deduster 4, and the bypass flue A6 is equipped with evaporating column
8；The inner tip of the evaporating column 8 is equipped with flue gas flow guide system 10 and rotary atomizer 9, the flue gas flow guide system 10 and institute
It states bypass flue A6 to communicate, the bottom sides of the evaporating column 8 are equipped with exhanst gas outlet, the exhanst gas outlet and the bypass flue
A6 is communicated；Removing ash pipeline 14 is connected immediately below the bottom of the evaporating column 8.
The entrance of the bypass flue B15 connects the flue collector before the economizer 1, and the bypass flue B15's goes out
Mouth connects the bypass flue A6；
The entrance of the conditioning tank 11 connects desulfurizing tower 5 by desulfurization wastewater pipeline 12, and the outlet of the conditioning tank 11 is logical
It crosses desulfurization wastewater pipeline 12 and connects the rotary atomizer 9.
The inlet connection of the bypass flue A6 is equipped with the bypass flue baffle A7 for adjusting aperture, the bypass
The inlet connection of flue B15 is equipped with the bypass flue baffle B16 for adjusting aperture.
The outlet of the bypass flue B15 and the tie point of bypass flue A6 are located at bypass flue baffle on bypass flue A6
Between A7 and flue gas flow guide system 10.
Full load desulfurization wastewater flue is realized based on thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system
The method of evaporation, comprising the following steps:
Step 1, the desulfurization wastewater that the desulfurizing tower 5 generates enters the conditioning tank 11 through the desulfurization wastewater pipeline 12,
Conditioning tank 11 plays buffering and stablizes wastewater flow.
Step 2, the waste water that the conditioning tank 11 exports enters the rotary atomizer 9 through the desulfurization wastewater pipeline 12,
It is that the drop that partial size is 20-80 μm enters evaporating column through high speed rotation atomization.
Step 3, when unit load is in 60%THA and 60%THA or more, open and adjust the bypass flue baffle
A7, the part high-temperature flue gas before the air preheater 3 in flue collector enter the flue gas flow guide system 10 through the bypass flue A6,
It forms spiral flue gas stream and enters the evaporating column 8.
When unit operating load is reduced to 60%THA or less, bypass flue baffle A7 and bypass flue gear are opened simultaneously
Plate B16 makes the part high-temperature flue gas before economizer 1 import bypass flue A6 through the bypass flue B15；Due to province's coal
The aperture of bypass flue baffle A7 and bypass flue baffle B16 is adjusted at 350 DEG C or more in high-temperature flue-gas before device 1,
Stablize the temperature for converging rear flue gas at 320 DEG C or more.High-temperature flue gas after converging enters the flue gas flow guide system 10, is formed
Spiral flue gas stream enters the evaporating column 8.
Step 4, the spiral flue gas stream and the waste water drop are sufficiently mixed heat exchange, exhausted water in the evaporating column 8
Drop is discharged by rapid evaporation, solid particulate matter a part of generation through the removing ash pipeline 14 of 8 bottom of evaporating column, another part
It is discharged with flue gas from the 8 bottom end side of evaporating column, the flue collector after the air preheater 3 is returned to, finally by the deduster 4
It captures.
Further, when unit operating load is 60% and 60% or more, as the raising or desulfurization of operating load are useless
The reduction of water flow reduces the aperture of bypass flue baffle A7, reduces the cigarette for entering bypass flue A6 by flue collector before air preheater 3
Tolerance reduces the hot fume consumption of waste water evaporation；With the reduction of operating load or the reduction of desulfurization wastewater flow, increase other
The aperture of road damper A7 improves and enters the exhaust gas volumn of bypass flue A6 by flue collector before air preheater 3, it is ensured that waste water it is complete
Evaporation.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system, including with the sequentially connected economizer of flue collector
(1), SCR denitration device (2), air preheater (3), deduster (4) and desulfurizing tower (5), which is characterized in that further include bypass flue A
(6), bypass flue B (15) and conditioning tank (11), in which:
The entrance of the bypass flue A (6) connects the flue collector between the SCR denitration device (2) and air preheater (3), described
The outlet of bypass flue A (6) connects the flue collector between the air preheater (3) and deduster (4), on the bypass flue A (6)
Equipped with evaporating column (8)；The inner tip of the evaporating column (8) is equipped with flue gas flow guide system (10) and rotary atomizer (9), described
Flue gas flow guide system (10) is communicated with the bypass flue A (6), and the bottom sides of the evaporating column (8) are equipped with exhanst gas outlet, institute
Exhanst gas outlet is stated to communicate with the bypass flue A (6)；Removing ash pipeline (14) are connected immediately below the bottom of the evaporating column (8)；
The entrance of the bypass flue B (15) connects the flue collector before the economizer (1), the bypass flue B (15)
Outlet connects the bypass flue A (6)；
The entrance of the conditioning tank (11) is gone out by desulfurization wastewater pipeline (12) connection desulfurizing tower (5), the conditioning tank (11)
Mouth connects the rotary atomizer (9) by desulfurization wastewater pipeline (12).
2. thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system according to claim 1, which is characterized in that described
The inlet connection of bypass flue A (6) is equipped with bypass flue baffle A (7), the bypass flue B for adjusting aperture
(15) inlet connection is equipped with the bypass flue baffle B (16) for adjusting aperture.
3. thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system according to claim 2, which is characterized in that described
The outlet of bypass flue B (15) and the tie point of bypass flue A (6) be located on bypass flue A (6) bypass flue baffle A (7) and
Between flue gas flow guide system (10).
4. realizing the side of full load desulfurization wastewater flue evaporation based on thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system
Method, which comprises the following steps:
Step 1, the desulfurization wastewater that desulfurizing tower (5) generates enters conditioning tank (11) through desulfurization wastewater pipeline (12)；
Step 2, the desulfurization wastewater of conditioning tank (11) outlet enters rotary atomizer 9 through desulfurization wastewater pipeline (12), through height
Fast rotary-atomizing is that the waste water drop that partial size is 20-80 μm enters evaporating column (8)；
Step 3, it when unit operating load is 60% and 60% or more, opens and adjusts bypass flue baffle A (7), air preheater
(3) the part high-temperature flue gas before in flue collector enters flue gas flow guide system (10) through bypass flue A (6), forms spiral flue gas stream
Into the evaporating column (8)；
When unit operating load is reduced to 60% or less, bypass flue baffle A (7) and bypass flue baffle B are opened simultaneously
(16), so that the part high-temperature flue gas before economizer (1) is imported bypass flue A (6) through bypass flue B (15), adjust bypass cigarette
The aperture of road baffle A (7) and bypass flue baffle B (16) stablize the temperature for converging rear flue gas at 320 DEG C or more；After converging
Flue gas enter the flue gas flow guide system (10), formed spiral flue gas stream enter the evaporating column (8)；
Step 4, the spiral flue gas stream and the waste water drop are sufficiently mixed heat exchange, waste water drop in the evaporating column (8)
It is discharged by solid particulate matter a part of rapid evaporation, generation through the removing ash pipeline (14) of the evaporating column (8) bottom, another portion
Divide and be discharged with flue gas from the exhanst gas outlet of the evaporating column (8) bottom end side, returns to the flue collector after the air preheater (3),
Finally captured by the deduster (4).
5. the method according to claim 4 for realizing the evaporation of full load desulfurization wastewater flue, which is characterized in that unit operation
Load, with the raising of operating load or the reduction of desulfurization wastewater flow, reduces bypass flue gear at 60% and 60% or more
The aperture of plate A (7) reduces the exhaust gas volumn for entering (6) bypass flue A by flue collector before air preheater (3), reduces the heat of waste water evaporation
Flue gas consumption；With the reduction of operating load or the reduction of desulfurization wastewater flow, increase the aperture of bypass flue baffle A (7),
Improve the exhaust gas volumn for entering (6) bypass flue A by flue collector before air preheater (3), it is ensured that the evaporating completely of waste water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811626874.2A CN109485117A (en) | 2018-12-28 | 2018-12-28 | A kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system and method |
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|---|---|---|---|
| CN201811626874.2A CN109485117A (en) | 2018-12-28 | 2018-12-28 | A kind of thermal power plant's full load desulfurization wastewater flue duct bypass vapo(u)rization system and method |
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| CN109485117A true CN109485117A (en) | 2019-03-19 |
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| CN112413623A (en) * | 2020-11-25 | 2021-02-26 | 安化华晟生物能源有限责任公司 | Flue smoke discharging system |
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