CN206846763U - A kind of modified flue gas cooling and dust pelletizing system - Google Patents
A kind of modified flue gas cooling and dust pelletizing system Download PDFInfo
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- CN206846763U CN206846763U CN201720533809.XU CN201720533809U CN206846763U CN 206846763 U CN206846763 U CN 206846763U CN 201720533809 U CN201720533809 U CN 201720533809U CN 206846763 U CN206846763 U CN 206846763U
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Abstract
It the utility model is related to a kind of modified flue gas cooling and dust pelletizing system.Existing modified flue gas cooling and dust pelletizing system are difficult to solve the problems, such as not only to have controlled flue-gas temperature but also control condensate temperature and effectively prevent component corrosion.The utility model includes low low-level (stack-gas) economizer, is characterized in：Also include circulation water-cooled valve, cooling tower, steam stop, condensate pipeline and condensate temperature measurement apparatus, low low-level (stack-gas) economizer radiating delivery port connection circulation water-cooled valve interface, circulation water-cooled valve outlet is connected by circulating water-cooled water pipeline with cooling tower water side-entrance, and cooling tower water side outlet is connected by circulating water-cooled water return pipeline and low low-level (stack-gas) economizer radiating water return outlet.Jet chimney is connected with steam stop import, and steam stop outlet is connected with low-pressure heater steam inlet, and the outlet of low-pressure heater condensate is connected with condensate pipeline.The utility model can make full use of low-quality heat, good in economic efficiency.
Description
Technical field
A kind of cooling of modified flue gas and dust pelletizing system are the utility model is related to, it is low-quality to be that one kind can either make full use of
Waste heat, the system that and can enough improves efficiency of dust collection, belongs to energy-conserving and environment-protective technical fiel.
Background technology
Low temperature electrostatic precipitation technology is carried out using for some time, the country also has considerable thermal power plant to adopt abroad
With such technology.The key of this technology is that flue-gas temperature is reduced into less than 90 DEG C, so that most of sulfur trioxide in flue gas
Sulfuric acid mist is formed, is mutually sticked with dust, and is neutralized by alkaline matter, the ratio resistance of dust can be greatly lowered, avoid anti-electricity
Dizzy phenomenon, reaches the purpose for improving efficiency of dust collection.Low temperature electric cleaner technology is typically equipped with all types of heat and handed over when in use
Parallel operation, system is set to possess the effect for saving energy consumption.The country has the utility model of patent such as Application No. 201310288968.4 special
Profit, description reduces flue-gas temperature using flue gas heat exchanger, so as to improve the system of the efficiency of low temperature electric cleaner, patent Shen
Number it please propose for 201510972237.0 a utility model patent and a kind of can regulate and control flue gas temperature immediately in unit running process
Degree so that the low low-level (stack-gas) economizer system of dust collection efficiency stability and high efficiency and anacidity corrosion risk.But these patents are in reality
In in place of Shortcomings.
Distance between low low-level (stack-gas) economizer and low temperature electric cleaner can not be long, because through too low low-level (stack-gas) economizer
Flue-gas temperature after cooling is generally below 90 DEG C, when flue gas does not arrive at dedusting electric field, the adhesion of acid mist and dust and unobvious,
If substantial amounts of acid mist touches flue, then lasting corrosiveness can be produced to pipeline.
Existing flue gas cool-down residual-heat utilization method be directly by the low-temperature condensate of unit lead to low low-level (stack-gas) economizer it
In, such condensate pipeline is under more severe working environment, once leaking, condensation water supply can be had an impact very
Maintenance shut-downs may extremely be needed.
In order to prevent that water temperature is too low in circulating water pipeline, low-temperature corrosion is produced, is one by the way of pipeline water temperature is regulated and controled
The feasible means of kind, but flow control directly is carried out in condensing water conduit, the resistance situation of whole condensate system can be produced
It is raw to influence, frequently carry out to influence the service behaviour of small pump when flow control is serious, reduce small pump service life.
Existing flue-gas-cooling system relies solely on low low-level (stack-gas) economizer, and when condensed water, can not to fully absorb flue gas excessive
During heat, flue-gas temperature off-design value can be caused, so as to reduce the efficiency of low temperature electric dust collector.
Power plant aut omation, intelligentized management mode have been popularized at present, and flue gas cooling and dust pelletizing system are also required to
Realize unattended operation maintenance mode.
Present existing technology does not propose good solution to the above situation.
Utility model content
The purpose of this utility model is can effectively solve a system present in existing flue gas cooling and dust pelletizing system
Row problem：First, by low low-level (stack-gas) economizer and low temperature electric cleaner against arrangement, acid mist is to system as far as possible in reduction flue gas
Corrosion；Second, control the temperature of flue gas by the way of indirect heat exchange, corrosive pipeline is reduced in low low-level (stack-gas) economizer to cold
The influence of condensate system；Third, during regulation circulating water temperature, only resistance change occurs for intercycle heat exchange pipeline system, to machine
The condensate system non-resistance of group influences, and ensures small pump stable operation；Fourth, when flue gas heat is excessive and condensate system without
Method takes away heat in time, and flue-gas temperature can gradually rise, install additional supplement cooling system after can to disperse unnecessary heat in time,
Flue-gas temperature is controlled to ensure the efficiency of dust collection of system below setting value；Fifth, intelligent control system is used, monitoring in real time,
Control in advance, improve the control accuracy of system, reduce the workload of attendant.Modified flue gas provided by the utility model is cold
But and dust pelletizing system can efficiently control flue-gas temperature, avoid condensate system from directly by the threat corroded, improving moisturizing
The working condition of pump, possibility of the flue gas to corrosive pipeline is reduced, increase the Automated condtrol precision of system, the system of improving is removed
The functional reliability of system is added while dirt efficiency.
The technical scheme in the invention for solving the above technical problem is：The modified flue gas cools down and dust pelletizing system bag
Low low-level (stack-gas) economizer is included, its design feature is：Also include middle low-temperature flue gas pipeline, smoke temperature measurement device, equipment connection
Pipeline, low temperature electric cleaner, low-temperature flue gas discharge line, recirculated water water pipeline, water circulating pump, low-pressure heater, circulation
Water bypass interlocking regulating valve, recirculated water backwater motor-driven valve, recirculated water return water temperature measurement apparatus, recirculated water water return pipeline, circulation
It is water-cooled valve, circulation water-cooled water pipeline, cooling tower, circulation water-cooled water return pipeline, jet chimney, steam stop, solidifying
Waterpipe and condensate temperature measurement apparatus, the middle low-temperature flue gas pipeline are connected with the gas approach of low low-level (stack-gas) economizer, institute
State low low-level (stack-gas) economizer to be connected with the gas approach of low temperature electric cleaner by equipment connecting line, the smoke temperature measurement
Device is arranged on equipment connecting line, and the exhanst gas outlet of the low temperature electric cleaner is connected with low-temperature flue gas discharge line；
The circulating water outlet of the low low-level (stack-gas) economizer is connected by the import of recirculated water water pipeline and water circulating pump, the recirculated water
The outlet of pump and the circulating water intake of low-pressure heater connect, the circulating-water bypass way outlet and circulating-water bypass of the low-pressure heater
The import connection of road interlocking regulating valve, the circulating water outlet of the low-pressure heater connect with the import of recirculated water backwater motor-driven valve
Connect, the outlet of the recirculated water bypass interlocking regulating valve and the outlet of recirculated water backwater motor-driven valve connect with recirculated water water return pipeline
Connect, the recirculated water return water temperature measurement apparatus is arranged on recirculated water water return pipeline, and the recirculated water water return pipeline is connected to
The circulating water intake of low low-level (stack-gas) economizer；The import of the water circulating pump connection circulation water-cooled valve, the circulation water-cooled valve
Outlet by circulate water-cooled water pipeline and cooling tower water side-entrance connect, the water side outlet of the cooling tower is by following
Ring water-cooled water return pipeline is connected with the radiating water return outlet of low low-level (stack-gas) economizer；The import of the jet chimney and steam stop
Connection, the outlet of the steam stop and the steam inlet of low-pressure heater connect, the condensate outlet of the low-pressure heater
It is connected with condensate pipeline, the condensate temperature measurement apparatus is arranged at the temperature measuring point of low-pressure heater.
Preferably, cooling tower described in the utility model is closed circulation cooling tower.
Preferably, water circulating pump described in the utility model is frequency conversion water circulating pump.
Preferably, recirculated water bypass interlocking regulating valve described in the utility model, recirculated water backwater motor-driven valve, steam cut-off
Valve is controlled by recirculated water return water temperature measurement apparatus, and corresponding closure or openness operation is carried out according to return water temperature.
Preferably, circulation water-cooled valve described in the utility model is controlled by smoke temperature measurement device, according to flue gas temperature
Spend parameter and carry out closure or openness operation.
Preferably, equipment connecting line described in the utility model is extremely short so that low low-level (stack-gas) economizer and low low temperature electric remove
Dirt device nestles up arrangement.
A kind of modified flue gas cooling and dust removal method, its feature are：Cool down and remove using described modified flue gas
The operating procedure of dirt system, the modified flue gas cooling and dust removal method is as follows：
（1）Under design point, flue gas caused by Thermal generation unit reaches low low-level (stack-gas) economizer after cooling layer by layer,
Cooled down by recirculated water, now recirculated water backwater motor-driven valve open, and recirculated water bypass interlocking regulating valve, steam stop and
Circulate water-cooled valve to close, supplement cooling system does not work, and steam concurrent heating system does not work, and flue gas reaches design after heat exchange
Low temperature electric cleaner is directly discharged into after temperature and carries out dedusting, is finally discharged by low-temperature flue gas discharge line；
（2）When the heat entrained by flue gas is excessive, and the condensed water in low-pressure heater can not take away heat in time, flue gas
Temperature measuring equipment can detect flue-gas temperature in real time, when flue-gas temperature exceedes setting value, open circulation water-cooled valve, remaining
Valve keeps constant, and the aperture of water-cooled valve is circulated by adjusting, and gradually reduces flue-gas temperature to reasonable level；Work as flue-gas temperature
Drop to and circulation water-cooled valve is then closed below design load, remaining valve keeps constant；
（3）When flue gas carry shortage of heat, when condensed water can not be heated into design load, can cause circulating water temperature by
Gradually reduce, while the exit water temperature of low-pressure heater also can not be up to standard, it is now real-time according to recirculated water return water temperature measurement apparatus
The temperature of measurement, the aperture that interlocking regulating valve and recirculated water backwater motor-driven valve are bypassed to recirculated water is adjusted, by reasonable distribution
Siphunculus road and the flow of water return pipeline, most always cause recirculated water return water temperature exceedes to design minimum limitation；Simultaneously close off recirculated water
Radiate valve, opens steam stop, and the data measured according to condensate temperature measurement apparatus determine valve opening, ensure that low pressure adds
Hot device exit water temperature is up to standard.
Preferably, the utility model flue gas enters low low-level (stack-gas) economizer, subsequently enter low temperature electric cleaner heel row and go out
Form flue gas cool-down dedusting passage；Recirculated water enters low-pressure heater by being discharged in low low-level (stack-gas) economizer, by water circulating pump, with
Interlocking regulating valve is bypassed by recirculated water afterwards and recirculated water backwater motor-driven valve returns to low low-level (stack-gas) economizer and forms recirculated water suction heat release
Passage；Recirculated water by circulating water-cooled valve enters cooling tower after being come out from water circulating pump, is then returned to low low-level (stack-gas) economizer
Form recirculated water supplement heat dissipation channel；Steam enters low-pressure heater by steam stop, subsequently becomes condensate and discharges to be formed
Steam concurrent heating passage.
The utility model compared with prior art, has advantages below and effect：（1）Low low-level (stack-gas) economizer and low low temperature electric
Deduster is against arrangement, it is possible to prevente effectively from corrosion of the acid mist to pipeline；（2）By the way of indirect heat exchange, low low temperature is avoided
Influence of the corrosion that may be present to condensate system in economizer；（3）When carrying out circulating water temperature regulation, it is cold that unit is not influenceed
The resistance situation of condensate system, ensure small pump stable operation；（4）Supplement cooling system can disperse unnecessary heat in time,
The reliability of raising system；（5）Intelligentized control system, monitor in real time, improve the intelligent level of system；（6）Structure
Reasonable in design, design is unique, operates steadily, good reliability.
Brief description of the drawings
Fig. 1 is the structural representation of the cooling of modified flue gas and dust pelletizing system in the utility model embodiment.
In figure：1st, middle low-temperature flue gas pipeline；2nd, low low-level (stack-gas) economizer；3rd, smoke temperature measurement device；4th, equipment connecting tube
Road；5th, low temperature electric cleaner；6th, low-temperature flue gas discharge line；7th, recirculated water water pipeline；8th, water circulating pump；9th, low-pressure heating
Device；10th, recirculated water bypass interlocking regulating valve；11st, recirculated water backwater motor-driven valve；12nd, recirculated water return water temperature measurement apparatus；13、
Recirculated water water return pipeline；14th, water-cooled valve is circulated；15th, water-cooled water pipeline is circulated；16th, cooling tower；17th, water-cooled is circulated
Water return pipeline；18th, jet chimney；19th, steam stop；20th, condensate pipeline；21st, condensate temperature measurement apparatus.
Embodiment
Below in conjunction with the accompanying drawings and the utility model is described in further detail by embodiment, and following examples are pair
It is of the present utility model explanation and the utility model is not limited to following examples.
Embodiment.
Referring to Fig. 1, the cooling of modified flue gas in the present embodiment and dust pelletizing system include middle low-temperature flue gas pipeline 1, low
Warm economizer 2, smoke temperature measurement device 3, equipment connecting line 4, low temperature electric cleaner 5, low-temperature flue gas discharge line 6,
Recirculated water water pipeline 7, water circulating pump 8, low-pressure heater 9, recirculated water bypass interlocking regulating valve 10, recirculated water backwater motor-driven valve
11st, recirculated water return water temperature measurement apparatus 12, recirculated water water return pipeline 13, circulation water-cooled valve 14, circulation water-cooled flow pipe
Road 15, cooling tower 16, circulation water-cooled water return pipeline 17, jet chimney 18, steam stop 19, condensate pipeline 20 and condensed water
Temperature measuring equipment 21, wherein, water circulating pump 8 can be frequency conversion water circulating pump, and cooling tower 16 can be closed circulation cooling tower.
Middle low-temperature flue gas pipeline 1 in the present embodiment is connected with the gas approach of low low-level (stack-gas) economizer 2, low low-level (stack-gas) economizer
2 are connected by equipment connecting line 4 with the gas approach of low temperature electric cleaner 5, and smoke temperature measurement device 3 is arranged on equipment
On connecting line 4, the exhanst gas outlet of low temperature electric cleaner 5 is connected with low-temperature flue gas discharge line 6.
The circulating water outlet of low low-level (stack-gas) economizer 2 entering by recirculated water water pipeline 7 and water circulating pump 8 in the present embodiment
Mouth connection, the outlet of water circulating pump 8 are connected with the circulating water intake of low-pressure heater 9, and the recirculated water of low-pressure heater 9 bypasses out
The import that mouth bypasses interlocking regulating valve 10 with recirculated water is connected, and the circulating water outlet and recirculated water backwater of low-pressure heater 9 are electronic
The import connection of valve 11, the outlet of recirculated water bypass interlocking regulating valve 10 and the outlet of recirculated water backwater motor-driven valve 11 are all connected to
Recirculated water water return pipeline 13, recirculated water return water temperature measurement apparatus 12 are arranged on recirculated water water return pipeline 13, recirculated water backwater
Pipeline 13 is connected to the circulating water intake of low low-level (stack-gas) economizer 2.
The interface of the connection circulation water-cooled of water circulating pump 8 valve 14 in the present embodiment, the outlet of circulation water-cooled valve 14 leads to
Cross circulation water-cooled water pipeline 15 to be connected with the water side-entrance of cooling tower 16, the water side outlet of cooling tower 16 is dissipated by recirculated water
Hot water return pipeline 17 is connected with the radiating water return outlet of low low-level (stack-gas) economizer 2.
Jet chimney 18 in the present embodiment is connected with the import of steam stop 19, the outlet of steam stop 19 with it is low
The steam inlet connection of heater 9 is pressed, the condensate outlet of low-pressure heater 9 is connected with condensate pipeline 20, condensate temperature measurement
Device 21 is installed at the temperature measuring point of low-pressure heater 9.
The cooling of modified flue gas and dust pelletizing system in the present embodiment are included with lower channel：Flue gas enters low low-level (stack-gas) economizer
2, subsequently enter discharge after low temperature electric cleaner 5 and form flue gas cool-down dedusting passage；Recirculated water in low low-level (stack-gas) economizer 2 by arranging
Go out, low-pressure heater 9 is entered by water circulating pump 8, interlocking regulating valve 10 and recirculated water backwater electricity are then bypassed by recirculated water
Dynamic valve 11 returns to low low-level (stack-gas) economizer 2 and forms recirculated water suction heat releasing passage；Recirculated water out passes through circulation afterwards from water circulating pump 8
Water-cooled valve 14 enters cooling tower 16, is then returned to low low-level (stack-gas) economizer 2 and forms recirculated water supplement heat dissipation channel；Steam passes through steaming
Vapour stop valve 19 enters low-pressure heater 9, subsequently becomes condensate and discharges to form steam concurrent heating passage.
The operating procedure of the cooling of modified flue gas and dust pelletizing system in the present embodiment is as follows.
（1）Under design point, flue gas caused by Thermal generation unit reaches low low-level (stack-gas) economizer after cooling layer by layer
2, cooled down by recirculated water, now recirculated water backwater motor-driven valve 11 is opened, and recirculated water bypass interlocking regulating valve 10, steam are cut
Only valve 19 and circulation water-cooled valve 14 are closed, and supplement cooling system does not work, and steam concurrent heating system does not work, and flue gas is by heat exchange
After reach and low temperature electric cleaner 5 is directly discharged into after design temperature carries out dedusting, finally discharged by low-temperature flue gas discharge line.
（2）When the heat entrained by flue gas is excessive, and the condensed water in low-pressure heater 9 can not take away heat in time, cigarette
Gas temperature measuring equipment 3 can detect flue-gas temperature in real time, when flue-gas temperature exceedes setting value, open circulation water-cooled valve
14, remaining valve keeps constant, by adjusting the aperture of circulation water-cooled valve 14, gradually reduces flue-gas temperature to reasonable level；
Circulation water-cooled valve 14 is then closed when flue-gas temperature drops to below design load, remaining valve keeps constant.
（3）When flue gas carry shortage of heat, when condensed water can not be heated into design load, can cause circulating water temperature by
Gradually reduce, while the exit water temperature of low-pressure heater 9 also can not be up to standard, it is now real according to recirculated water return water temperature measurement apparatus 12
When the temperature that measures, the aperture that interlocking regulating valve 10 and recirculated water backwater motor-driven valve 11 are bypassed to recirculated water is adjusted, rationally
The flow of bypass line and water return pipeline is distributed, most always causes recirculated water return water temperature exceedes to design minimum limitation；Simultaneously close off
Water-cooled valve 14 is circulated, opens steam stop 19, the data measured according to condensate temperature measurement apparatus 21 determine that valve is opened
Degree, ensure that the exit water temperature of low-pressure heater 9 is up to standard.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to the utility model structure example explanation.
The equivalence changes or simple change that all construction, feature and the principle described according to the utility model patent design are done, are wrapped
Include in the protection domain of the utility model patent.The utility model person of ordinary skill in the field can be to described
Specific embodiment is made various modifications or supplement or substituted using similar mode, without departing from knot of the present utility model
Structure surmounts scope defined in the claims, all should belong to the scope of protection of the utility model.
Claims (3)
1. a kind of modified flue gas cooling and dust pelletizing system, including low low-level (stack-gas) economizer, it is characterised in that：Also include middle low temperature cigarette
Feed channel, smoke temperature measurement device, equipment connecting line, low temperature electric cleaner, low-temperature flue gas discharge line, recirculated water are sent
Waterpipe, water circulating pump, low-pressure heater, recirculated water bypass interlocking regulating valve, recirculated water backwater motor-driven valve, recirculated water backwater temperature
Measurement apparatus, recirculated water water return pipeline, circulation water-cooled valve, circulation water-cooled water pipeline, cooling tower, circulation water-cooled is spent to return
Waterpipe, jet chimney, steam stop, condensate pipeline and condensate temperature measurement apparatus, the middle low-temperature flue gas pipeline with
The gas approach connection of low low-level (stack-gas) economizer, the low low-level (stack-gas) economizer pass through equipment connecting line and low temperature electric cleaner
Gas approach is connected, and the smoke temperature measurement device is arranged on equipment connecting line, the cigarette of the low temperature electric cleaner
Gas outlet is connected with low-temperature flue gas discharge line；The circulating water outlet of the low low-level (stack-gas) economizer by recirculated water water pipeline with
The import connection of water circulating pump, the outlet of the water circulating pump and the circulating water intake of low-pressure heater connect, and the low pressure adds
The import that the circulating-water bypass way outlet of hot device bypasses interlocking regulating valve with recirculated water is connected, and the recirculated water of the low-pressure heater goes out
Mouth is connected with the import of recirculated water backwater motor-driven valve, and the outlet of the recirculated water bypass interlocking regulating valve and recirculated water backwater are electronic
The outlet of valve is connected with recirculated water water return pipeline, and the recirculated water return water temperature measurement apparatus is arranged on recirculated water water return pipeline
On, the recirculated water water return pipeline is connected to the circulating water intake of low low-level (stack-gas) economizer；The water circulating pump connection recirculated water dissipates
The import of thermal valve, water side-entrance of the outlet for circulating water-cooled valve by circulating water-cooled water pipeline and cooling tower connect
Connect, the water side outlet of the cooling tower is connected by circulating water-cooled water return pipeline with the radiating water return outlet of low low-level (stack-gas) economizer；
The import connection of the jet chimney and steam stop, the outlet of the steam stop and the steam inlet of low-pressure heater
Connection, the condensate outlet of the low-pressure heater are connected with condensate pipeline, and the condensate temperature measurement apparatus is arranged on low pressure
At the temperature measuring point of heater.
2. modified flue gas cooling according to claim 1 and dust pelletizing system, it is characterised in that：The cooling tower is enclosed
Circulating cooling tower.
3. modified flue gas cooling according to claim 1 and dust pelletizing system, it is characterised in that：The water circulating pump is change
Frequency water circulating pump.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720533809.XU CN206846763U (en) | 2017-05-15 | 2017-05-15 | A kind of modified flue gas cooling and dust pelletizing system |
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| CN201720533809.XU CN206846763U (en) | 2017-05-15 | 2017-05-15 | A kind of modified flue gas cooling and dust pelletizing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107036114A (en) * | 2017-05-15 | 2017-08-11 | 华电电力科学研究院 | A kind of modified flue gas cooling and dust pelletizing system and method |
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2017
- 2017-05-15 CN CN201720533809.XU patent/CN206846763U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107036114A (en) * | 2017-05-15 | 2017-08-11 | 华电电力科学研究院 | A kind of modified flue gas cooling and dust pelletizing system and method |
| CN107036114B (en) * | 2017-05-15 | 2023-09-15 | 华电电力科学研究院有限公司 | Improved flue gas cooling and dedusting system and method |
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