CN207845404U - Desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load - Google Patents
Desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load Download PDFInfo
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- CN207845404U CN207845404U CN201721866560.0U CN201721866560U CN207845404U CN 207845404 U CN207845404 U CN 207845404U CN 201721866560 U CN201721866560 U CN 201721866560U CN 207845404 U CN207845404 U CN 207845404U
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Abstract
The utility model is related to the desulfurization wastewater Zero discharging systems based on waste heat reuse under a kind of running on the lower load, including economizer gas bypass subsystem and desulfurization wastewater evaporative subsystem.The economizer gas bypass subsystem includes economizer bypass flue, and exhaust gas temperature and denitration efficiency under unit running on the lower load can be improved；The desulfurization wastewater evaporative subsystem includes waste pipe, Softening box, enrichment facility, waste water preheater, gas cooler, heating agent water pump, heating agent waterpipe, waste water pump and spray nozzle, concentration decrement, preheating and atomization can be carried out to waste water, promote its evaporation efficiency.This system has the characteristics that technological process is simple, and thermal flue gas can be efficiently used under unit running on the lower load and realizes the zero-emission of waste water, while system denitration efficiency also can be improved.
Description
Technical field
The utility model is related to the desulfurization wastewater Zero discharging systems based on waste heat reuse under a kind of running on the lower load, specially
A kind of system for evaporating desulfurization wastewater using thermal flue gas under coal-burning power plant's running on the lower load, belongs to thermal power generation energy-saving and emission-reduction
Field.
Background technology
Low temperature flue evaporation technique is one of the technical way for realizing Desulphurization for Coal-fired Power Plant wastewater zero discharge, principle
It is the flue by desulfurization wastewater atomized spray between air preheater and electric precipitator, evaporates waste water using fume waste heat as heat source,
Resulting particulate matter etc. enters electric precipitator with flue gas and is captured.Since space is limited, which must be when shorter
The interior evaporation for completing waste water.Recent year coal unit is chronically at underrun state, the boiler when load reduction
Exhaust gas temperature also decreases, and causes the thermal energy of air preheater exiting flue gas to be not enough to evaporate waste water in given time, waste water
Drop is attached to flue inner wall, may lead to fouling, dust stratification, blocking and corrosion, even can influence electric precipitation when serious
The normal operation of device, desulfurization wastewater low temperature flue evaporation technique will be unable to come into operation.Improving exhaust gas temperature becomes reality
The key of desulfurization wastewater zero-emission under existing unit running on the lower load.
Another serious problems caused by performing low-load running of machine set are the decline of denitration efficiency, it is however generally that denitrating catalyst
Active reaction temperature is 320-420 DEG C, and when flue-gas temperature is too low, efficiency can be greatly reduced in SCR denitration equipment, when serious even
It is forced out of service, the discharge of nitrogen oxides will be unable to the requirement for reaching national minimum discharge.Economizer gas bypass technology is
Solve the problems, such as one of the important method of unit underload denitration, principle is the setting flue duct bypass in parallel with economizer, from province
Flue collector before coal device draws partial fume and directly imports the flue collector after economizer, due to changing for flue gas in economizer and water supply
Heat is lowered, and the temperature of SCR denitration equipment entrance flue gas gets a promotion, it is ensured that the efficiency of SCR denitration equipment.However, by
In the raising of flue-gas temperature, this method also results in the increase of boiler exhaust gas heat loss, rationally utilizes the part waste heat to improving
Unit capacity usage ratio important in inhibiting.
In conclusion under unit running on the lower load, desulfurization wastewater needs more sufficient thermal energy that could realize zero-emission；It saves
Coal device gas bypass technology also results in the raising of flue-gas temperature while improving denitration effect, increases boiler exhaust gas heat waste
It loses.If the partial heat energy is used for the evaporation of desulfurization wastewater, wastewater zero discharge not only may be implemented, can more improve unit energy profit
With rate.
Utility model content
To solve the above problems, the utility model provides the desulfurization wastewater zero based on waste heat reuse under a kind of running on the lower load
Exhaust system can be in unit for a kind of system of joint economizer gas bypass subsystem and desulfurization wastewater evaporative subsystem
The zero-emission that unit thermal flue gas realizes waste water is efficiently used under running on the lower load.Wherein, economizer gas bypass subsystem can
Promote unit underload denitration efficiency and smoke evacuation heat content；Desulfurization wastewater evaporative subsystem can pre-process waste water, concentrate and subtract
Amount and atomization etc. reduce demand of its evaporation process to thermal energy and realize zero-emission.
The purpose of this utility model is achieved through the following technical solutions：
Desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load, including be sequentially connected by flue
Boiler, economizer, SCR denitration equipment, air preheater, electric precipitator and desulfurizing tower, which is characterized in that further include economizer flue gas
Bypass subsystem and desulfurization wastewater evaporative subsystem；
Wherein, the economizer gas bypass subsystem includes economizer bypass flue；
The desulfurization wastewater evaporative subsystem includes by the sequentially connected Softening box of waste pipe, enrichment facility, waste water
Preheater, waste water pump and spray nozzle；Wherein, the Softening box connects desulfurizing tower, the atomized spray by waste pipe
Device is mounted in the flue between the air preheater and electric precipitator.
Further, the flue collector before the entrance connection economizer entrance of the economizer bypass flue, junction is equipped with
The bypass flue baffle of adjustable aperture, the outlet of the economizer bypass flue connect the flue collector after economizer exit.
Further, gas cooler is installed, the flue gas is cold in the flue between the electric precipitator and desulfurizing tower
But device is connected by heating agent waterpipe with waste water preheater, and the waste water preheater is installed between enrichment facility and waste water pump
On waste pipe.
Further, the heating agent waterpipe is equipped with heating agent water pump.
Further, the enrichment facility uses principle of reverse osmosis, and desulfurization wastewater is filtered into high-concentration waste water and clear water.
Further, the enrichment facility is additionally provided with fresh water pipeline.
The beneficial effects of the utility model are：
1. improving the temperature of flue gas between air preheater and electric precipitator, it is insufficient to solve flue-gas temperature under running on the lower load
Caused waste water evaporates incomplete problem, realizes the zero-emission of desulfurization wastewater.
2. being preheated to waste water using the waste heat of flue gas between electric precipitator and desulfurizing tower, removed using air preheater and electricity
The waste heat of flue gas is evaporated waste water between dirt device, improves system capacity utilization rate.
3. improving the temperature of SCR denitration equipment importation flue gas, it is ensured that the denitration efficiency of unit in low- load conditions.
4. waste water evaporation increases smoke moisture, is conducive to the reunion of wherein flue dust, reduces the discharge of fine particle.
5. improving air preheater entrance flue gas temperature, it is too low caused to alleviate air preheater cold junction temperature under running on the lower load
The problems such as fouling and blocking.
6. the concentration of waste water can generating unit distinguish water, saved water resource.
Description of the drawings
Fig. 1 is the structure of the desulfurization wastewater Zero discharging system based on waste heat reuse under running on the lower load described in the utility model
Schematic diagram；
Wherein, 1- boilers, 2- economizers, 3-SCR denitration devices, 4- air preheaters, 5- electric precipitators, 6- desulfurizing towers, 7- are soft
Change case, 8- enrichment facilities, 9- waste water preheaters, 10- gas coolers, 11- heating agent water pumps, 12- waste water pumps, 13- atomized sprays
Device, 14- waste pipes, 15- fresh water pipelines, 16- flue collectors, 17- economizer bypass flues, 18- bypass flue baffles, 19- give
Waterpipe, 20- heating agent waterpipes.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only explaining this
Utility model is not used to limit the utility model.
As shown in Figure 1, the desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load, including pass through cigarette
The sequentially connected boiler 1 in road, economizer 2, SCR denitration equipment 3, air preheater 4, electric precipitator 5 and desulfurizing tower 6, further include province's coal
Device gas bypass subsystem and desulfurization wastewater evaporative subsystem；
Wherein, the economizer gas bypass subsystem includes economizer bypass flue 17；The economizer bypass flue
Flue collector 16 before 17 entrance connection 2 entrance of economizer, junction is equipped with the bypass flue baffle 18 of adjustable aperture, described
Flue collector 16 behind outlet connection economizer 2 outlet of economizer bypass flue 17.
The desulfurization wastewater evaporative subsystem include by 14 sequentially connected Softening box 7 of waste pipe, enrichment facility 8,
Waste water preheater 9, waste water pump 12 and spray nozzle 13；Wherein, the Softening box 7 connects desulfurizing tower by waste pipe 14
6, the spray nozzle 13 is mounted in the flue between the air preheater 4 and electric precipitator 5.The electric precipitator 5 and de-
Gas cooler 10 is installed, the gas cooler 10 is pre- by heating agent waterpipe 20 and waste water in the flue between sulphur tower 6
Hot device 9 is connected, and the waste water preheater 9 is installed on the waste pipe 14 between enrichment facility 8 and waste water pump 12.The heating agent
Waterpipe 20 is equipped with heating agent water pump 11.
The enrichment facility 8 uses principle of reverse osmosis, and desulfurization wastewater is filtered into high-concentration waste water and clear water.
The enrichment facility 8 is additionally provided with fresh water pipeline 15.
Desulfurization wastewater zero under running on the lower load is realized using the desulfurization wastewater Zero discharging system based on waste heat reuse
The method of discharge, includes the following steps：
Step 1, when unit load reduces, bypass flue baffle 18 is opened, is controlled by economizer by adjusting its aperture
The flow of 17 flue gas of road flue, partial fume enter the flue collector 16 after economizer 2 exports and master through economizer bypass flue 17
Flue gas mixes, and since the partial fume has neither part nor lot in the heat exchange of economizer 2, can carry 3 input gas temperature of SCR denitration equipment
320 DEG C or more are risen to, SCR denitration device efficiency is promoted to 80-90%；Meanwhile 4 exit gas temperature of air preheater improves 5-20
DEG C, provide more sufficient heat source for desulfurization wastewater evaporation.
Step 2, desulfurization wastewater enters Softening box 7, removes desulfurization wastewater hardness ions, by hardness be adjusted to 150ppm with
Under (with calcium carbonate), alleviate and prevent waste water from fouling and blocking occurring in enrichment facility 8；Desulfurization wastewater after softening enters
Enrichment facility 8 is filtered into high-concentration waste water and clear water by reverse osmosis mode, and wherein clear water is discharged by fresh water pipeline 15
It utilizes again, high-concentration waste water enters waste water preheater 9；Due to the reduction of waste water water, the heat that evaporation needs is reduced.
Step 3, high temperature heat medium water heat is absorbed into the high-concentration waste water of waste water preheater 9, temperature improves about 40-60
DEG C, it is further reduced the heat demand of its evaporation；The heat medium water that temperature reduces enters gas cooler 10 and absorbs 5 He of electric precipitator
Fume waste heat between desulfurizing tower 6 is returned to waste water preheater 9 under the action of heating agent water pump 11 and continues heat release, recycled with this；
Step 4, the desulfurization wastewater being discharged by waste water preheater 9 enters spray nozzle 13 under the action of waste water pump 12,
It is atomized the drop for about 30-60 μm of average grain diameter, is sprayed in the flue between air preheater 4 and electric precipitator 5, moisture absorption
Fume waste heat is evaporated, and the solid particulate matter of generation enters electric precipitator 5 with main flue gas and is captured, and completes wastewater zero discharge.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (6)
1. the desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load, including it is sequentially connected by flue
Boiler (1), economizer (2), SCR denitration equipment (3), air preheater (4), electric precipitator (5) and desulfurizing tower (6), which is characterized in that
Further include economizer gas bypass subsystem and desulfurization wastewater evaporative subsystem；
Wherein, the economizer gas bypass subsystem includes economizer bypass flue (17)；
The desulfurization wastewater evaporative subsystem includes by waste pipe (14) sequentially connected Softening box (7), enrichment facility
(8), waste water preheater (9), waste water pump (12) and spray nozzle (13)；Wherein, the Softening box (7) passes through waste pipe
(14) connection desulfurizing tower (6), the spray nozzle (13) are mounted on the cigarette between the air preheater (4) and electric precipitator (5)
In road.
2. the desulfurization wastewater Zero discharging system based on waste heat reuse, feature under running on the lower load according to claim 1
It is, the flue collector (16) before entrance connection economizer (2) entrance of the economizer bypass flue (17), junction is equipped with can
The bypass flue baffle (18) of aperture is adjusted, behind outlet connection economizer (2) outlet of the economizer bypass flue (17)
Flue collector (16).
3. the desulfurization wastewater Zero discharging system based on waste heat reuse, feature under running on the lower load according to claim 1
It is, gas cooler (10), the flue gas cooling is installed in the flue between the electric precipitator (5) and desulfurizing tower (6)
Device (10) is connected by heating agent waterpipe (20) with waste water preheater (9), and the waste water preheater (9) is installed on enrichment facility
(8) on the waste pipe (14) between waste water pump (12).
4. the desulfurization wastewater Zero discharging system based on waste heat reuse, feature under running on the lower load according to claim 3
It is, the heating agent waterpipe (9) is equipped with heating agent water pump (11).
5. the desulfurization wastewater Zero discharging system based on waste heat reuse, feature under running on the lower load according to claim 1
It is, the enrichment facility (8) uses principle of reverse osmosis, and desulfurization wastewater is filtered into high-concentration waste water and clear water.
6. the desulfurization wastewater Zero discharging system based on waste heat reuse, feature under running on the lower load according to claim 5
It is, the enrichment facility (8) is additionally provided with fresh water pipeline (15).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721866560.0U CN207845404U (en) | 2017-12-27 | 2017-12-27 | Desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load |
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| CN201721866560.0U CN207845404U (en) | 2017-12-27 | 2017-12-27 | Desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107973475A (en) * | 2017-12-27 | 2018-05-01 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater Zero discharging system and method based on waste heat reuse under running on the lower load |
| CN111302424A (en) * | 2020-03-27 | 2020-06-19 | 中国华能集团清洁能源技术研究院有限公司 | Low-energy-consumption desulfurization wastewater treatment system and working method thereof |
-
2017
- 2017-12-27 CN CN201721866560.0U patent/CN207845404U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107973475A (en) * | 2017-12-27 | 2018-05-01 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater Zero discharging system and method based on waste heat reuse under running on the lower load |
| CN111302424A (en) * | 2020-03-27 | 2020-06-19 | 中国华能集团清洁能源技术研究院有限公司 | Low-energy-consumption desulfurization wastewater treatment system and working method thereof |
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