CN202715346U - Desulfurization system for energy-saving type coal-fired unit - Google Patents
Desulfurization system for energy-saving type coal-fired unit Download PDFInfo
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- CN202715346U CN202715346U CN 201220347503 CN201220347503U CN202715346U CN 202715346 U CN202715346 U CN 202715346U CN 201220347503 CN201220347503 CN 201220347503 CN 201220347503 U CN201220347503 U CN 201220347503U CN 202715346 U CN202715346 U CN 202715346U
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- water
- desulfurization
- mist eliminator
- filter cloth
- eliminator flushing
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Abstract
The utility model relates to the field of desulfuration of power plants, and discloses a desulfurization system for an energy-saving type coal-fired unit. The desulfurization system for the coal-fired unit comprises a desulfurization booster fan, a desulfurization absorption tower and a flue, wherein a flue gas cooler is arranged in the flue between the desulfurization booster fan and the desulfurization absorption tower; and after passing through the desulfurization booster fan, high-temperature flue gas generated by the coal-fired unit enters the flue, flows through the flue gas cooler, is cooled by the flue gas cooler, and then enters the desulfurization absorption tower for wet-type desulfurization. Because the flue gas cooler is arranged in the flue between the desulfurization booster fan and the desulfurization absorption tower, the temperature of condensation water is increased by recycled afterheat of flue gas, evaporated quantity of water in the desulfurization absorption tower is reduced, the water replenishment quantity of the absorption tower is reduced, desulfuration water is saved, and the purposes of saving energy and reducing consumption are achieved.
Description
Technical field
The utility model relates to the power plant desulfurization field, particularly a kind of energy saving coal burning generator set desulfurization system.
Background technology
Along with industrial expansion, the sulfur dioxide pollution of coal-fired power plant produces deeper and deeper harm to natural environment and human lives, and this problem is also dealt with the effective desulfurization measure of various advanced persons in numerous power plants.Flue gas desulfurization FGD(Flue gas desulfurization) be a kind of desulfurization method that coal-fired power plant mainly adopts, usually in coal-fired unit corresponding desulphurization system can be set, the former flue gas that coal combustion in the power generation process is produced passes through a series of processing of desulphurization system and is disposed to the external world.Desulphurization system is disposed to extraneous chimney after usually can being provided be used to the flue gas resistance that overcomes the FGD device booster fan that flue gas is introduced and flue gas being done further processing.
In the prior art, about 110 ℃ the former flue gas that coal-fired unit produces directly enters spray absorption tower and carries out desulfurization, clean flue gas after demister carries out gas-water separation enters in the atmosphere through chimney, demister regularly carries out the water flushing by the nozzle (each nozzle flow is 3.36T/h) on the mist eliminator flushing pipeline of thermoplastic connection, remove the drop and the dust that are captured by demister, keep the cleaning of blade surface, prevent blade fouling.There is the problem of the following aspects in the desulphurization system of existing coal-fired unit:
1.110 the former flue gas about ℃ directly enters spray type desulfurization absorption tower, its waste heat is not utilized, and is not energy-conservation, and the water in the desulfuration absorbing tower is evaporated in a large number;
2. the mist eliminator flushing pipeline of thermoplastic connection easily comes off, and has both increased washing water quantity and has destroyed the absorption tower water balance, affects again the mist eliminator flushing effect;
3. the mist eliminator flushing nozzle flow is excessive, is unfavorable for setting up the absorption tower water balance;
In addition, enter the absorption tower after the sealing water of the vacuum belt dewaterer of coal-fired unit desulphurization system and lubricated water directly drain into filtrate water box, sealing water and the lubricated water of vacuum belt dewatering bands machine are not recycled, and have also affected the absorption tower water balance.
The utility model content
The purpose of this utility model is to provide a kind of energy saving coal burning generator set desulfurization system, carries out wet type desulfurizing so that the high-temperature flue gas that coal-fired unit produces enters desulfuration absorbing tower after being lowered the temperature by gas cooler again, has reduced the evaporated quantity of water in the desulfuration absorbing tower.
For solving the problems of the technologies described above, embodiment of the present utility model provides a kind of energy saving coal burning generator set desulfurization system, comprise: desulfurization booster fan, desulfuration absorbing tower, flue are provided with gas cooler in the described flue between described desulfurization booster fan and described desulfuration absorbing tower;
The high-temperature flue gas that coal-fired unit produces enters described flue after the supercharging of described desulfurization booster fan, the described gas cooler of flowing through after described gas cooler cooling, enters described desulfuration absorbing tower again and carries out wet type desulfurizing.
The utility model embodiment in terms of existing technologies, by being provided with gas cooler in the flue between desulfurization booster fan and desulfuration absorbing tower, both utilized fume afterheat to reclaim again the raising condensing water temperature, reduced again the evaporated quantity of water in the desulfuration absorbing tower, thereby reduced the absorption tower rate of water make-up, save the desulfurization water, reached energy-saving and cost-reducing purpose.
In addition, this system also comprises vacuum belt dewaterer and the filter cloth water tank that links to each other with this vacuum belt dewaterer; Described filter cloth water tank provides sealing water and lubricated water for described vacuum belt dewaterer; The sealing water of described vacuum dehydration belt feeder and lubricated water are recycled to described filter cloth water tank.Sealing water and the lubricated water of vacuum belt dewaterer are recycled to the filter cloth water tank, and reuse the water consumption that can reduce the vacuum dehydration belt feeder, save the desulfurization water, improve the isorrheic broken ring of desulphurization system that causes because setting up gas cooler.
In addition, this system also comprises demister, the mist eliminator flushing pipeline, is connected on this mist eliminator flushing pipeline the valve that is used for the control mist eliminator flushing time, mist eliminator flushing nozzle; Described mist eliminator flushing nozzle is connected on the mist eliminator flushing pipeline, is positioned at upside and the downside of described demister; By valve control washing time, washing time is modified to 1.0min/120min by 1.5min/120min, thereby shortens each washing time, reduce the water consumption of each flushing demister, guarantee the washing time of demister.
In addition, the diameter of described mist eliminator flushing nozzle is less than default thresholding, diameter by flooding nozzle is set to less than default thresholding, the flushing flow rate of control mist eliminator flushing nozzle is per hour 1.62 tons, thereby by reducing the flushing flow rate of demister, reduce the water consumption of flushing demister, guarantee developing result and the washing time of demister, be conducive to set up the absorption tower water balance.
In addition, the ducted connected mode that respectively forms pipeline of described mist eliminator flushing is that plastic bolt fixedly adds the Plastic Welding connection.Be changed to plastic bolt by the connected mode with the mist eliminator flushing pipeline by the thermoplastic connection and fixedly add Plastic Welding, the absorption tower water balance of greatly having avoided causing because of the mist eliminator flushing shedding destroys, and has guaranteed again the developing result of demister simultaneously.
In addition, this system also comprises the filter cloth water tank, is connected to the filter cloth inlet controller of cistern on the described filter cloth water tank, and it adopts radar type liquid-level gauge, realizes automatic water supplement and cuts off the water by two position control water intaking valve.The filter cloth inlet controller of cistern is controlled described filter cloth water tank water intake mode with liquid level, has avoided the filter cloth water tank overflow, has saved the desulphurization system water, is conducive to set up the absorption tower water balance.
Description of drawings
Fig. 1 is the schematic diagram according to the energy saving coal burning generator set desulfurization system of the first embodiment of the present utility model;
Fig. 2 is the sealing water of vacuum belt dewaterer in the existing coal-fired unit desulphurization system and the schematic diagram that lubricated water enters filtrate water box;
Fig. 3 is according to the sealing water of vacuum belt dewaterer in the energy saving coal burning generator set desulfurization system of the second embodiment of the present utility model and the schematic diagram that lubricated water enters the filter cloth water tank.
The specific embodiment
For making the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing embodiment of the present utility model is explained in detail.Yet, persons of ordinary skill in the art may appreciate that in the utility model embodiment, in order to make the reader understand the application better many ins and outs have been proposed.But, even without these ins and outs with based on many variations and the modification of following embodiment, also can realize each claim of the application technical scheme required for protection.
The first embodiment of the present utility model relates to a kind of energy saving coal burning generator set desulfurization system, comprises desulfurization booster fan, desulfuration absorbing tower, flue, and has additional gas cooler in the flue between desulfurization booster fan and desulfuration absorbing tower, as shown in Figure 1.It should be noted that Fig. 1 only is schematic diagram, in actual applications, this gas cooler is the whole flue of all standing up and down.The high-temperature flue gas that coal-fired unit produces enters flue after the supercharging of desulfurization booster fan, the gas cooler of flowing through by after the cooling, enters desulfuration absorbing tower again and carries out wet type desulfurizing in gas cooler.
After setting up gas cooler in the flue between desulfurization booster fan and desulfuration absorbing tower, evaporated quantity of water reduces about 50% in the absorption tower.Specifically, about about 127 ℃ flue gas newly-increased gas cooler of after the booster fan supercharging, flowing through first under average load (75% load) operating mode, flue gas is cooled to about 80 ℃ by the condensate water in the heat-transfer pipe, enter again the desulfuration absorbing tower wet type desulfurizing, in this process, owing to improved condensing water temperature, thereby improved the operating efficiency of coal-fired unit, reached energy-saving and cost-reducing purpose; And before not setting up gas cooler, flue gas about 127 ℃ is directly to enter the absorption tower to carry out desulfurization, the flue gas temperature difference about 47 ℃ can make evaporated quantity of water reduction about 50% in the absorption tower, the absorption tower rate of water make-up is corresponding minimizing about about 50% also, thereby there is larger gap in original desulphurization system water balance before the gas cooler with not setting up, it will directly affect the rinsing quality (reducing the mist eliminator flushing number of times) of demister, cause that the demister differential pressure raises, even above design load, finally may cause the demister fouling even cave in, if the demister fragment sucks in the slurry circulating pump, may cause the slurry circulating pump impeller to break; Simultaneously power consumption of booster fan etc. also there is certain impact.
In terms of existing technologies, present embodiment is by arranging gas cooler in the flue between desulfurization booster fan and desulfuration absorbing tower, both utilized fume afterheat to reclaim again the raising condensing water temperature, reduced again the evaporated quantity of water in the desulfuration absorbing tower, thereby reduced the absorption tower rate of water make-up, save the desulfurization water, reached energy-saving and cost-reducing purpose.
The second embodiment of the present utility model relates to a kind of energy saving coal burning generator set desulfurization system, the second embodiment makes further improvements on the basis of the first embodiment, its improvements mainly are: in the second embodiment, the desulphurization system of coal-fired unit some technological improvements have been done, keep new water balance by reducing the absorption tower rate of water make-up, guarantee the water balance of desulphurization system, guarantee that desulphurization system can normally move.
For instance, by original desulphurization system water balance, with unit average load 380MW, 114 ℃ of booster fan entrance mean temperatures are example, every FGD evaporation capacity is reduced to 700 tons/day by original 1405 tons/day, add 110 tons/day of wastewater discharges, every total water consumption of FGD is 810 tons/day, for guaranteeing that the total rate of water make-up of every FGD of desulphurization system water balance is 810 tons/day.Reject filter cloth washing water, vacuum belt machine is lubricated with the lime stone of sealing water, slurry circulating pump cooling water and 50% mend slurry (50% usefulness fresh water (FW) with slurry, 50% is used the filtrate water with slurry) totally 430 tons/day must water, supplying every FGD mist eliminator flushing water is 380 tons/day.Every FGD mist eliminator flushing water yield is 63 tons/time, can only wash every day 6 times, well below the rinsing requirement (stipulating 12 times/days of every days) of demister regulation.
For above-mentioned case, the concrete measure that can take is as follows:
1. sealing water and the lubricated water with described vacuum belt dewaterer is recycled to the filter cloth water tank, and reuses.That is to say that desulphurization system also comprises vacuum belt dewaterer and the filter cloth water tank that links to each other with this vacuum belt dewaterer; This filter cloth water tank provides sealing water and lubricated water for vacuum belt dewaterer, and the sealing water of vacuum belt dewaterer and lubricated water are recycled to the filter cloth water tank.
Be recycled to the filter cloth water tank by sealing water and lubricated water with vacuum belt dewaterer, and reuse the water consumption that can reduce vacuum belt dewaterer, save the desulfurization water, improve the isorrheic broken ring of desulphurization system that causes because setting up gas cooler.For above-mentioned case, about 8 tons/hour of the sealing water of vacuum belt dewaterer and lubricated water, move calculating in 12 hours every day by dewatering system, about 48 tons of unit water yield, about about 96 tons of two unit water yields now enter filtrate water box (as shown in Figure 2), because it is clear water, its system reform can be recycled to filter cloth water tank (as shown in Figure 3), can increase about 96 tons of the mist eliminator flushing water yields every day.That is to say, can reduce about 96 tons of moisturizing every day.
2. demister first order upside and each valve washing time of second level downside are modified to 1.0min/120min by 1.5min/120min; By shortening each washing time, reduce the water consumption of each flushing demister, thereby guarantee the washing time of demister.Specifically, desulphurization system comprises demister, mist eliminator flushing pipeline, is connected to the valve that is used for the control mist eliminator flushing time on this mist eliminator flushing pipeline, mist eliminator flushing nozzle; The mist eliminator flushing nozzle is connected on the mist eliminator flushing pipeline, is positioned at upside and the downside of demister; Present demister is divided into two-stage, every one-level is evenly equipped with the mist eliminator flushing nozzle in both sides up and down, by the every interval of the valve of first order upside and second level downside was opened in 120 minutes, flushing water flow to mist eliminator flushing nozzles spray flushing demister by the mist eliminator flushing pipeline and closed afterwards in 1 minute, realizes above-mentioned washing time is modified to 1.0min/120min by 1.5min/120min.
3. the mist eliminator flushing nozzle is set to less than default thresholding, and the diameter by flooding nozzle is set to less than default thresholding, and the flushing flow rate of control mist eliminator flushing nozzle is per hour 1.62 tons.Specifically, with demister first order upside and second level downside totally 422 mist eliminator flushing nozzles change smallmouth into by large mouth, make flushing flow rate be changed to 1.62T/h by 3.36T/h, by reducing the flushing flow rate of demister, reduce the water consumption of flushing demister, thereby guarantee developing result and the washing time of demister, be conducive to set up the absorption tower water balance.For above-mentioned case, the mist eliminator flushing flow is down to about 35 tons/time by 63 tons/time.Through the flushing flow rate adjustment, the mist eliminator flushing number of times can reach 13 times/days, has satisfied simultaneously the requirement of mist eliminator flushing quality and number of times.
The 3rd embodiment of the present utility model relates to a kind of energy saving coal burning generator set desulfurization system, the 3rd embodiment makes further improvements on the basis of the first embodiment, its improvements mainly are: in the 3rd embodiment, change the connected mode that respectively forms pipeline in the mist eliminator flushing pipeline into plastic bolt and fixedly add the Plastic Welding connection.
Because the mist eliminator flushing pipeline that thermoplastic connects easily comes off, both increase washing water quantity and destroyed the absorption tower water balance, affect again the mist eliminator flushing effect, therefore, the connected mode of mist eliminator flushing pipeline connected by thermoplastic be changed to plastic bolt and fixedly add Plastic Welding, the absorption tower water balance of greatly having avoided causing because of the mist eliminator flushing shedding destroys, and has guaranteed again the developing result of demister simultaneously.
In addition, because float-ball type control is adopted in existing filter cloth cistern water level control, the vavuum pump backwater is just in time aimed at ball-cock assembly, cause the filter cloth water tank that overflow phenomena is often arranged, therefore suggestion improves control filter cloth water tank water intake mode and avoids the filter cloth water tank overflow, specifically, the filter cloth inlet controller of cistern that is connected on the filter cloth water tank can be set adopt radar type liquid-level gauge, realize automatic water supplement and cut off the water by two position control water intaking valve, avoid the filter cloth water tank overflow, thereby save the desulphurization system water, be conducive to set up the absorption tower water balance.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above are to realize specific embodiment of the utility model, and in actual applications, can do various changes to it in the form and details, and do not depart from spirit and scope of the present utility model.
Claims (6)
1. energy saving coal burning generator set desulfurization system comprises: desulfurization booster fan, desulfuration absorbing tower, flue, it is characterized in that, and be provided with gas cooler in the described flue between described desulfurization booster fan and described desulfuration absorbing tower;
The high-temperature flue gas that coal-fired unit produces enters described flue after the supercharging of described desulfurization booster fan, the described gas cooler of flowing through after described gas cooler cooling, enters described desulfuration absorbing tower again and carries out wet type desulfurizing.
2. energy saving coal burning generator set desulfurization according to claim 1 system is characterized in that this system also comprises vacuum belt dewaterer and the filter cloth water tank that links to each other with this vacuum belt dewaterer;
Described filter cloth water tank provides sealing water and lubricated water for described vacuum belt dewaterer;
The sealing water of described vacuum belt dewaterer and lubricated water are recycled to described filter cloth water tank.
3. energy saving coal burning generator set desulfurization according to claim 1 system, it is characterized in that, this system also comprises demister, mist eliminator flushing pipeline, is connected to the valve that is used for the control mist eliminator flushing time on this mist eliminator flushing pipeline, mist eliminator flushing nozzle;
Described mist eliminator flushing nozzle is connected on the mist eliminator flushing pipeline, is positioned at upside and the downside of described demister.
4. energy saving coal burning generator set desulfurization according to claim 3 system is characterized in that the diameter of described mist eliminator flushing nozzle is less than default thresholding.
5. according to claim 3 or 4 described energy saving coal burning generator set desulfurization systems, it is characterized in that the ducted connected mode that respectively forms pipeline of described mist eliminator flushing is that plastic bolt fixedly adds Plastic Welding and connects.
6. energy saving coal burning generator set desulfurization according to claim 1 system is characterized in that this system also comprises the filter cloth water tank, is connected to the filter cloth inlet controller of cistern on the described filter cloth water tank;
Described filter cloth inlet controller of cistern adopts radar type liquid-level gauge, realizes automatic water supplement and cuts off the water by two position control water intaking valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220347503 CN202715346U (en) | 2012-07-17 | 2012-07-17 | Desulfurization system for energy-saving type coal-fired unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220347503 CN202715346U (en) | 2012-07-17 | 2012-07-17 | Desulfurization system for energy-saving type coal-fired unit |
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| CN202715346U true CN202715346U (en) | 2013-02-06 |
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| CN 201220347503 Expired - Fee Related CN202715346U (en) | 2012-07-17 | 2012-07-17 | Desulfurization system for energy-saving type coal-fired unit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104689696A (en) * | 2015-02-03 | 2015-06-10 | 北京理工大学 | Environment-friendly energy-saving system for recycling and reusing flue gas |
| CN106310908A (en) * | 2016-11-01 | 2017-01-11 | 北镇市青岩节能设备制造有限公司 | Cyclonic water film dust collector with vacuum automatic water supply device |
| CN108499335A (en) * | 2018-06-08 | 2018-09-07 | 大唐环境产业集团股份有限公司 | A kind of string tower desulphurization system for rinsing demister using recycling filtrate water |
| CN108844090A (en) * | 2018-06-26 | 2018-11-20 | 中国能源建设集团广东省电力设计研究院有限公司 | Energy-saving wet flue gas air inducing equipment and method |
-
2012
- 2012-07-17 CN CN 201220347503 patent/CN202715346U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104689696A (en) * | 2015-02-03 | 2015-06-10 | 北京理工大学 | Environment-friendly energy-saving system for recycling and reusing flue gas |
| CN106310908A (en) * | 2016-11-01 | 2017-01-11 | 北镇市青岩节能设备制造有限公司 | Cyclonic water film dust collector with vacuum automatic water supply device |
| CN108499335A (en) * | 2018-06-08 | 2018-09-07 | 大唐环境产业集团股份有限公司 | A kind of string tower desulphurization system for rinsing demister using recycling filtrate water |
| CN108844090A (en) * | 2018-06-26 | 2018-11-20 | 中国能源建设集团广东省电力设计研究院有限公司 | Energy-saving wet flue gas air inducing equipment and method |
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Granted publication date: 20130206 Termination date: 20210717 |