CN209537028U - A kind of thermal power plant end high-salinity wastewater zero-emission processing system - Google Patents
A kind of thermal power plant end high-salinity wastewater zero-emission processing system Download PDFInfo
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- CN209537028U CN209537028U CN201821229350.5U CN201821229350U CN209537028U CN 209537028 U CN209537028 U CN 209537028U CN 201821229350 U CN201821229350 U CN 201821229350U CN 209537028 U CN209537028 U CN 209537028U
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Abstract
The utility model relates to a kind of thermal power plant end high-salinity wastewater zero-emission processing systems, are used for large-scale power station end high-salinity wastewater zero-emission.The utility model includes low-temperature flue gas pipeline, high-temperature flue gas pipeline, air preheater, gas cooler, deduster, desulfurizing tower and air-introduced machine；Vacuum pump extracts the vapor in cryogenic vaporizer and forms vacuum, the heat of flue gas heat-exchange unit supply is absorbed into the end high-salt wastewater of cryogenic vaporizer at this time, and it is concentrated by evaporation under the conditions of low-temp low-pressure, the vapor of generation passes through steam-water separation, gas after separation enters desulfurizing tower, and the water after separation weighs as desulphurization system moisturizing maintenance level；Waste water after concentration sprays into air preheater import flue again or exhaust pass is flashed, and is finally reached the purpose of end high-salinity wastewater zero-emission.The utility model is able to achieve the end thermal power plant Quan Chang high-salinity wastewater zero-emission, and can not influence air preheater inlet flue gas temperature and boiler efficiency, without the risk of air preheater blocking.
Description
Technical field
The utility model relates to a kind of thermal power plant end high-salinity wastewater zero-emission processing systems, with high salt for thermal power plant end
Wastewater zero discharge processing.
Background technique
China's national situation is still based on thermal power generation at present, and sewerage, the stone that thermal power plant has recirculated water to generate
Desulfurization wastewater, the reverse osmosis sewage etc. that lime stone-gypsum wet desulphurization system generates, containing many poisonous and hazardous in these sewage
Substance, carrying out processing can be only achieved emission request.Since waste water quality is many kinds of, water is of different sizes, is handling this
It is relatively difficult when a little waste water, and the generally existing system complex of these methods, take up a large area, the problems such as operating cost is high.
High-salt wastewater processing technique in end used at present mainly include the following types:
The first is that chemical agent-feeding treatment is carried out to end high-salt wastewater, waste water is precipitated, is filtered, is neutralized, is flocculated,
Infiltration, evaporation, crystallization use the treatment process such as three header devices.Such as application No. is the patents of invention of 201711106836.X
Application, disclose a kind of desulfurization wastewater Zero discharging system, in this system desulfurization wastewater by chemicals addition control, plate compression, softening,
It precipitates, filter, permeating, evaporating a series of processing, finally obtaining clear water and high-purity sodium salt.This process is to wastewater treatment
Completely, the recycled water and high-purity salt of available cleaning, but take up a large area, investment cost and operating cost are all very
It is high.
Second of processing at the beginning of for end high-salt wastewater is carried out dosing is introduced directly into boiler height without chemical treatment
In warm flue, waste water is evaporated using high-temperature flue gas.Such as application No. is 201710942060.9 patent of invention Shens
Please, a kind of Desulphurization for Coal-fired Power Plant wastewater zero discharge system and method are disclosed, the method pre-processes desulfurization wastewater by dosing
After be re-introduced into air preheater before be evaporated, due to desulfurization wastewater spray into position be air preheater gas approach, in this way
It can be lowered into the smoke temperature of air preheater, eventually reduced boiler efficiency, moreover, the crystal salt for evaporating generation also increases
The risk for having added air preheater to block.For another example application No. is 201710058803.6 application for a patent for invention, one kind is disclosed
FGD wastewater zero discharge system, this system preheat desulfurization wastewater using low-temperature flue gas, are concentrated, and high-temperature flue gas is then utilized
Waste water after concentration is evaporated.Although the method also achieves wastewater zero discharge, but the waste water benefit after the concentration of this system
It is evaporated with the flue gas before air preheater entrance, finally can also reduce boiler efficiency, increase air preheater blocking
Risk, and limited in operation by low-temperature flue gas temperature, when low-temperature flue gas temperature is lower than 100 DEG C, it may be difficult to desulfurization
Waste water is concentrated.
Utility model content
The purpose of the utility model is to overcome the above deficiencies in the existing technologies, and it is reasonable to provide a kind of design
Thermal power plant's end high-salinity wastewater zero-emission processing system.
The technical scheme in the invention for solving the above technical problem is: a kind of thermal power plant end high-salinity wastewater zero-emission
Processing system, including low-temperature flue gas pipeline, high-temperature flue gas pipeline, air preheater, gas cooler, deduster, desulfurizing tower and
Air-introduced machine；It is characterized in that, the air preheater, gas cooler and deduster are sequentially arranged along the flow direction of flue gas
On high-temperature flue gas pipeline, one end of deduster is connected to high-temperature flue gas pipeline, the other end and low-temperature flue gas of the deduster
Pipeline connection, the deduster, air-introduced machine and desulfurizing tower are sequentially arranged on low-temperature flue gas pipeline along the flow direction of flue gas；
The desulfurizing tower is connected to by desulfurization wastewater pipeline with cryogenic vaporizer, and waste water pump is equipped on the desulfurization wastewater pipeline and is given up
Water spray head, the waste water spray head are located at the inside of cryogenic vaporizer；High-salt wastewater introduces pipe and is connected to desulfurization wastewater pipeline；
The cryogenic vaporizer is connected to by concentrated water pipeline with high-temperature flue gas pipeline, and concentrated water pump is equipped on the concentrated water pipeline, described
Concentrated water pipe arrangement has No.1 concentrated water branch pipe and No. two concentrated water branch pipes, distinguishes on the No.1 concentrated water branch pipe and No. two concentrated water branch pipes
No.1 valve and No. two valves are installed, are also separately installed with No.1 concentrated water on the No.1 concentrated water branch pipe and No. two concentrated water branch pipes
Spray head and No. two concentrated water spray heads, the No.1 concentrated water spray head and No. two concentrated water spray heads are respectively positioned on high-temperature flue gas pipeline
It is interior；Compressed air pipe is connected to concentrated water pipeline；The low-temperature flue gas pipeline is connected by No.1 bypass flue and flue gas heat-exchange unit
It is logical, low-temperature flue gas bypass pump is installed, the low-temperature flue gas bypass pump has the function for adjusting flow on the No.1 bypass flue
Energy；The inside of cryogenic vaporizer is arranged in the flue gas heat-exchange unit, and the flue gas heat-exchange unit is located at the lower section of waste water spray head, institute
It states flue gas heat-exchange unit and also passes through No. two bypass flues and be connected to low-temperature flue gas pipeline；The cryogenic vaporizer by steam-water pipe with
Steam-water separator is connected to, and is equipped with vacuum pump on the steam-water pipe, vacuum pump can control the hydrone in cryogenic vaporizer
Pressure, so that high-salt wastewater can gasify at a lower temperature；The steam-water separator passes through exhaust piping and low-temperature flue gas
Pipeline connection, separation waterpipe are connected to steam-water separator.
Furthermore, the steam-water pipe is mounted on the top of cryogenic vaporizer.
Furthermore, the exhaust piping is mounted on the top of steam-water separator, and the separation waterpipe is mounted on vapour
The junction of the lower part of separator, the exhaust piping and low-temperature flue gas pipeline is located on the gas approach of air-introduced machine.
Furthermore, the No.1 concentrated water branch pipe and No. two concentrated water branch pipes are connected to air with high-temperature flue gas pipeline respectively
On the inlet flue duct and exhaust pass of preheater, the interface of the concentrated water pipeline and compressed air pipe is located at the outlet of concentrated water pump
On pipeline.
Furthermore, the interface of the No.1 bypass flue and low-temperature flue gas pipeline is located at the exhaust pass of deduster
On, the interface of No. two bypass flues and low-temperature flue gas pipeline is located on the gas approach of air-introduced machine.
A kind of working method of thermal power plant end high-salinity wastewater zero-emission processing system as described above, which is characterized in that
The working method is as follows: it is with high salt useless that the desulfurization wastewater and high-salt wastewater that desulfurizing tower generates introduce each equipment end that pipe introduces
Water is squeezed into waste water spray head by desulfurization wastewater pipeline by waste water pump jointly and is sprayed into cryogenic vaporizer, and cryogenic vaporizer is sprayed into
In waste water absorb the heat of flue gas heat-exchange unit release, temperature rises to 65 DEG C or more；Vacuum pump controls the interior of cryogenic vaporizer
Pressure is at low-pressure state, and the high-salt wastewater sprayed at this time evaporates in a low pressure environment generates vapor and condensed water；Its
In, condensed water flows into concentrated water pump by concentrated water pipeline, and the compressed air being then sent into compressed air pipe mixes；Work as condensed water
Amount it is larger when, open No. two valves, be passed through condensed water in No. two concentrated water spray heads by No. two concentrated water branch pipes and spray into sky
The gas approach of air preheater is flashed, and the crystal salt of generation is removed when passing through deduster with flue gas；When the amount of condensed water
When smaller, No.1 valve is opened, be passed through condensed water in No.1 concentrated water spray head by No.1 concentrated water branch pipe and sprays into air is pre-
The exhaust pass of hot device is flashed, and the crystal salt of generation is removed when passing through deduster with flue gas；It in this way can be according to concentration
Water inventory selection sprays into the flue of suitable smoke temperature, it is ensured that condensed water flashes completely；High-salt wastewater evaporates production in cryogenic vaporizer
Raw vapor then passes through steam-water pipe and is sent into steam-water separator by vacuum pump, and vapor is separated into useless in steam-water separator
Gas and cleaner water, exhaust gas enter the inlet flue gas pipeline of air-introduced machine by exhaust piping, and cleaner water is introduced into desulfurization
Tower is recycled as moisturizing；Low-temperature flue gas in low-temperature flue gas pipeline is pumped into No.1 bypass flue by low-temperature flue gas bypass
Flue gas heat-exchange unit discharges heat to cryogenic vaporizer, the gas approach of air-introduced machine is then entered by No. two bypass flues；According to
The temperature requirements of cryogenic vaporizer adjust the control of low-temperature flue gas bypass pump and flow into the flue gas flow of cryogenic vaporizer, and adjust useless
Water pump controls high-salt wastewater flow, guarantees suitable waste strength, avoids the high-salt wastewater in cryogenic vaporizer from crystallizing, together
When flue gas heat-exchange unit using heat pipe plate enamel technology, not only ensure that heat exchange efficiency but also met requirement for anticorrosion.
More specifically, the interior pressure of vacuum pump control cryogenic vaporizer is in 0.025MPa.
The utility model compared with prior art, has the following advantages that and effect: the utility model can be realized thermal power plant
The end Quan Chang high-salinity wastewater zero-emission, and the inlet flue gas temperature of air preheater is not influenced, boiler efficiency is not influenced, without air
The risk of preheater blocking；Meanwhile by providing environment under low pressure, realizes and evaporate high-salt wastewater under cryogenic conditions, not by low temperature
Flue-gas temperature is not less than 100 DEG C of limitation, or even can evaporate high-salt wastewater without using flue gas.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model embodiment.
In figure: desulfurization wastewater pipeline 1, steam-water pipe 2, exhaust piping 3, separation waterpipe 4, No.1 bypass flue 5, two
Bypass flue 6, concentrated water pipeline 7, compressed air pipe 8, low-temperature flue gas pipeline 9, high-temperature flue gas pipeline 10, high-salt wastewater introduce pipe
11, air preheater 21, gas cooler 22, deduster 23, desulfurizing tower 24, cryogenic vaporizer 25, steam-water separator 26, waste water
Spray head 27, No.1 concentrated water spray head 28, flue gas heat-exchange unit 29, waste water pump 31, vacuum pump 32, concentrated water pump by 33, low-temperature flue gas
Road pumps 34, air-introduced machine 35,71, No. two concentrated water branch pipes 72 of No.1 concentrated water branch pipe, the concentrated water of valve 74, two of No.1 valve 73, two
Spray head 281.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is pair
The explanation of the utility model and the utility model is not limited to following embodiment.
Embodiment.
Referring to Fig. 1, a kind of thermal power plant end high-salinity wastewater zero-emission processing system, including low-temperature flue gas pipeline 9, high temperature cigarette
Feed channel 10, air preheater 21, gas cooler 22, deduster 23, desulfurizing tower 24 and air-introduced machine 35；Air preheater 21,
Gas cooler 22 and deduster 23 are sequentially arranged on high-temperature flue gas pipeline 10 along the flow direction of flue gas, deduster 23
One end is connected to high-temperature flue gas pipeline 10, and the other end of deduster 23 is connected to low-temperature flue gas pipeline 9, deduster 23, air-introduced machine
35 and desulfurizing tower 24 be sequentially arranged on low-temperature flue gas pipeline 9 along the flow direction of flue gas；Desulfurizing tower 24 passes through desulfurization wastewater
Pipeline 1 is connected to cryogenic vaporizer 25, and waste water pump 31 and waste water spray head 27, waste water spray are equipped on desulfurization wastewater pipeline 1
First 27 are located at the inside of cryogenic vaporizer 25；High-salt wastewater introduces pipe 11 and is connected to desulfurization wastewater pipeline 1；Cryogenic vaporizer 25 is logical
Overrich waterpipe 7 is connected to high-temperature flue gas pipeline 10, concentrated water pump 33 is equipped on concentrated water pipeline 7, concentrated water pipeline 7 is disposed with No.1
No.1 valve is separately installed on concentrated water branch pipe 71 and No. two concentrated water branch pipes 72, No.1 concentrated water branch pipe 71 and No. two concentrated water branch pipes 72
73 and No. two valves 74,28 He of No.1 concentrated water spray head is also separately installed on No.1 concentrated water branch pipe 71 and No. two concentrated water branch pipes 72
No. two concentrated water spray heads 281, No.1 concentrated water spray head 28 and No. two concentrated water spray heads 281 are respectively positioned in high-temperature flue gas pipeline 10；
Compressed air pipe 8 is connected to concentrated water pipeline 7；Low-temperature flue gas pipeline 9 is connected by No.1 bypass flue 5 and flue gas heat-exchange unit 29
It is logical, low-temperature flue gas bypass pump 34 is installed, flue gas heat-exchange unit 29 is arranged in cryogenic vaporizer 25 on No.1 bypass flue 5
Portion, flue gas heat-exchange unit 29 are located at the lower section of waste water spray head 27, and flue gas heat-exchange unit 29 also passes through No. two bypass flues 6 and low temperature cigarette
Feed channel 9 is connected to；Cryogenic vaporizer 25 is connected to by steam-water pipe 2 with steam-water separator 26, is equipped with vacuum on steam-water pipe 2
Pump 32；Steam-water separator 26 is connected to by exhaust piping 3 with low-temperature flue gas pipeline 9, and separation waterpipe 4 and steam-water separator 26 connect
It is logical.
In the present embodiment, steam-water pipe 2 is mounted on the top of cryogenic vaporizer 25.
In the present embodiment, exhaust piping 3 is mounted on the top of steam-water separator 26, and separation waterpipe 4 is mounted on carbonated drink point
The junction of lower part from device 26, exhaust piping 3 and low-temperature flue gas pipeline 9 is located on the gas approach of air-introduced machine 35.
In the present embodiment, No.1 concentrated water branch pipe 71 and No. two concentrated water branch pipes 72 are connected to sky with high-temperature flue gas pipeline 10 respectively
On the inlet flue duct and exhaust pass of air preheater 21, the interface of concentrated water pipeline 7 and compressed air pipe 8 is located at concentrated water pump 33
On outlet conduit.
In the present embodiment, the interface of No.1 bypass flue 5 and low-temperature flue gas pipeline 9 is located at the exhaust pass of deduster 23
On, the interface of No. two bypass flues 6 and low-temperature flue gas pipeline 9 is located on the gas approach of air-introduced machine 35.
The working method of above-mentioned thermal power plant's end high-salinity wastewater zero-emission processing system is as follows: desulfurizing tower 24 generates de-
Sulphur waste water and high-salt wastewater introduce each equipment end high-salt wastewater that pipe 11 introduces and pass through desulfurization wastewater by waste water pump 31 jointly
Pipeline 1 is squeezed into waste water spray head 27 and is sprayed into cryogenic vaporizer 25, and the waste water sprayed into cryogenic vaporizer 25 absorbs flue gas and changes
The heat that hot device 29 discharges, temperature rise to 65 DEG C or more；The interior pressure that vacuum pump 32 controls cryogenic vaporizer 25 exists
0.025MPa, the high-salt wastewater sprayed at this time evaporates in a low pressure environment generates vapor and condensed water；Wherein, condensed water is passed through
Concentrated water pipeline 7 flows into concentrated water pump 33, and the compressed air being then sent into compressed air pipe 8 mixes；When the amount of condensed water is larger
When, No. two valves 74 are opened, condensed water is made to be passed through in No. two concentrated water spray heads 281 by No. two concentrated water branch pipes 72 and spray into air
The gas approach of preheater 21 is flashed, and the crystal salt of generation is removed when passing through deduster 23 with flue gas；When condensed water
When measuring smaller, No.1 valve 73 is opened, condensed water is made to be passed through in No.1 concentrated water spray head 28 and spray by No.1 concentrated water branch pipe 71
The exhaust pass for entering air preheater 21 is flashed, and the crystal salt of generation is removed when passing through deduster 23 with flue gas；It is with high salt
The vapor that waste water evaporates generation in cryogenic vaporizer 25 then passes through steam-water pipe 2 and is sent into steam-water separator by vacuum pump 32
26, vapor is separated into exhaust gas and cleaner water in steam-water separator 26, and exhaust gas enters air-introduced machine by exhaust piping 3
35 inlet flue gas pipeline, cleaner water are introduced into desulfurizing tower 24 and recycle as moisturizing；Low temperature in low-temperature flue gas pipeline 9
Flue gas is sent into flue gas heat-exchange unit 29 by low-temperature flue gas bypass pump 34 in No.1 bypass flue 5, discharges heat to cryogenic vaporizer
25, the gas approach of air-introduced machine 35 is then entered by No. two bypass flues 6；According to the temperature requirements of cryogenic vaporizer 25, adjust
It saves the control of low-temperature flue gas bypass pump 34 and flows into the flue gas flow of cryogenic vaporizer 25, and adjust waste water pump 31 and control high-salt wastewater stream
Amount, guarantees suitable waste strength, the high-salt wastewater in cryogenic vaporizer 25 is avoided to crystallize, while flue gas heat-exchange unit 29 is adopted
Enamel technology is plated with heat pipe, heat exchange efficiency had not only been ensure that but also had met requirement for anticorrosion.
Although the utility model is disclosed as above with embodiment, its protection scope being not intended to limit the utility model,
Any technical staff for being familiar with this technology, it is made in the conception and scope for not departing from the utility model to change and retouch,
It all should belong to the protection range of the utility model.
Claims (5)
1. a kind of thermal power plant end high-salinity wastewater zero-emission processing system, including low-temperature flue gas pipeline (9), high-temperature flue gas pipeline
(10), air preheater (21), gas cooler (22), deduster (23), desulfurizing tower (24) and air-introduced machine (35)；Its feature exists
In the air preheater (21), gas cooler (22) and deduster (23) are sequentially arranged in along the flow direction of flue gas
On high-temperature flue gas pipeline (10), one end of deduster (23) is connected to high-temperature flue gas pipeline (10), the deduster (23) it is another
One end is connected to low-temperature flue gas pipeline (9), the deduster (23), air-introduced machine (35) and desulfurizing tower (24) along flue gas flowing
Direction is sequentially arranged on low-temperature flue gas pipeline (9)；The desulfurizing tower (24) passes through desulfurization wastewater pipeline (1) and cryogenic vaporizer
(25) it is connected to, waste water pump (31) and waste water spray head (27), the waste water spray head is installed on the desulfurization wastewater pipeline (1)
(27) it is located at the inside of cryogenic vaporizer (25)；High-salt wastewater introduces pipe (11) and is connected to desulfurization wastewater pipeline (1)；The low temperature
Evaporator (25) is connected to by concentrated water pipeline (7) with high-temperature flue gas pipeline (10), and concentrated water pump is equipped on the concentrated water pipeline (7)
(33), the concentrated water pipeline (7) is disposed with No.1 concentrated water branch pipe (71) and No. two concentrated water branch pipes (72), the No.1 concentrated water branch pipe
(71) and on No. two concentrated water branch pipes (72) No.1 valve (73) and No. two valves (74), the No.1 concentrated water branch pipe are separately installed with
(71) and on No. two concentrated water branch pipes (72) it is also separately installed with No.1 concentrated water spray head (28) and No. two concentrated water spray heads (281),
The No.1 concentrated water spray head (28) and No. two concentrated water spray heads (281) are respectively positioned in high-temperature flue gas pipeline (10)；Compressed air
Pipeline (8) is connected to concentrated water pipeline (7)；The low-temperature flue gas pipeline (9) passes through No.1 bypass flue (5) and flue gas heat-exchange unit
(29) it is connected to, is equipped with low-temperature flue gas bypass pump (34) on the No.1 bypass flue (5), flue gas heat-exchange unit (29) setting
In the inside of cryogenic vaporizer (25), the flue gas heat-exchange unit (29) is located at the lower section of waste water spray head (27), and the flue gas changes
Hot device (29) is also connected to by No. two bypass flues (6) with low-temperature flue gas pipeline (9)；The cryogenic vaporizer (25) passes through carbonated drink
Pipeline (2) is connected to steam-water separator (26), is equipped with vacuum pump (32) on the steam-water pipe (2)；The steam-water separator
(26) it is connected to by exhaust piping (3) with low-temperature flue gas pipeline (9), separation waterpipe (4) is connected to steam-water separator (26).
2. thermal power plant end high-salinity wastewater zero-emission processing system according to claim 1, which is characterized in that the carbonated drink
Pipeline (2) is mounted on the top of cryogenic vaporizer (25).
3. thermal power plant end high-salinity wastewater zero-emission processing system according to claim 1, which is characterized in that the exhaust gas
Pipeline (3) is mounted on the top of steam-water separator (26), and the separation waterpipe (4) is mounted under steam-water separator (26)
Portion, the exhaust piping (3) and the junction of low-temperature flue gas pipeline (9) are located on the gas approach of air-introduced machine (35).
4. thermal power plant end high-salinity wastewater zero-emission processing system according to claim 1, which is characterized in that the No.1
Concentrated water branch pipe (71) and No. two concentrated water branch pipes (72) be connected to respectively with high-temperature flue gas pipeline (10) air preheater (21) into
On mouth flue and exhaust pass, the interface of the concentrated water pipeline (7) and compressed air pipe (8) is located at the outlet of concentrated water pump (33)
On pipeline.
5. thermal power plant end high-salinity wastewater zero-emission processing system according to claim 1, which is characterized in that the No.1
Bypass flue (5) and the interface of low-temperature flue gas pipeline (9) are located on the exhaust pass of deduster (23), No. two bypass flues
(6) it is located on the gas approach of air-introduced machine (35) with the interface of low-temperature flue gas pipeline (9).
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| CN109133237A (en) * | 2018-08-01 | 2019-01-04 | 华电电力科学研究院有限公司 | A kind of thermal power plant end high-salinity wastewater zero-emission processing system and its working method |
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| CN109133237A (en) * | 2018-08-01 | 2019-01-04 | 华电电力科学研究院有限公司 | A kind of thermal power plant end high-salinity wastewater zero-emission processing system and its working method |
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