CN212166999U - Energy-saving flue desulphurization unit - Google Patents
Energy-saving flue desulphurization unit Download PDFInfo
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- CN212166999U CN212166999U CN201922438763.5U CN201922438763U CN212166999U CN 212166999 U CN212166999 U CN 212166999U CN 201922438763 U CN201922438763 U CN 201922438763U CN 212166999 U CN212166999 U CN 212166999U
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Abstract
The utility model discloses an energy-saving flue desulfurization device, which comprises a storage bin, a feeder and a discharging boot which are connected in sequence; also comprises a bag-type dust collector; the bag-type dust collector is connected with an air preheater of the boiler through a first flue; a first desulfurization spraying point is arranged on a second flue between a high-temperature economizer and a low-temperature economizer of the boiler, a second desulfurization spraying point is arranged on the position, close to a bag-type dust collector, on the flue, a first distributor for powder conveying and distribution is arranged at the first desulfurization spraying point, and a second distributor for powder conveying and distribution is arranged at the second desulfurization spraying point; first distributor and second distributor all are connected through the powder outlet of sending powder pipeline with the unloading boots, and this desulphurization unit reforms transform with low costs, adsorption effect is good, adsorption efficiency is high, the desulfurizer use amount is few, and the desulfurization is with low costs.
Description
Technical Field
The utility model relates to a flue gas desulfurization equipment reason field especially relates to an energy-saving flue desulphurization unit.
Background
The existing boiler flue gas desulfurization technology generally comprises the following steps: and (3) calcium spraying dry desulfurization, semi-dry desulfurization, wet desulfurization and the like in the furnace: the dry desulphurization effect of the calcium spraying in the furnace is poor, the ultra-low emission requirement is difficult to achieve, and the method is generally taken as an auxiliary desulphurization means; the semi-dry desulfurization effect is higher than that of dry desulfurization, but the ultra-low emission requirement is difficult to achieve, the coal quality application range is narrow, and the overall cost is high; the wet desulphurization and desulfurization has high efficiency, but the cost is high, and the subsequent treatment problem of the waste water and the flue gas white elimination causes secondary pollution and needs higher cost treatment.
Chinese patent CN109499295A discloses a dry desulfurization system, which comprises: the storage device, the feeding device, the grinding device, the injection device, the reactor and the dust removal device are connected in sequence; the storage device is used for storing materials; the feeding device is used for feeding the grinding device; the grinding device is used for grinding the material output by the feeding device into ultrafine powder and outputting the ultrafine powder; the injection device is used for uniformly mixing and accelerating the superfine powder output by the grinding device and compressed air and injecting the mixture into the reactor; the reactor is used for receiving the flue gas generated by combustion so as to fully react the ultrafine powder sprayed by the spraying device with the sulfur dioxide in the flue gas to remove the sulfur dioxide in the flue gas; the dust removal device is used for removing dust in the desulfurized flue gas and outputting the flue gas reaching the standard to a chimney; the patent has the advantages of small initial investment, low operating cost and environmental protection. However, this patent also has certain drawbacks:
firstly, the patent needs to arrange a reactor, the flue gas and the desulfurizer react in the reactor, and the investment cost is slightly higher;
secondly, the desulfurization reaction of the patent is carried out in the reactor, so only one desulfurization is carried out, and in order to ensure the desulfurization effect, the dosage of the desulfurizing agent is increased, or the retention time of the flue gas in the reactor is prolonged, and the desulfurization efficiency is not high.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the problem of prior art, providing an energy-saving flue desulphurization unit that transformation cost is low, adsorption effect is good, adsorption efficiency is high, the desulfurizer use amount is few, and the desulfurization is with low costs.
In order to realize the purpose of the utility model, the technical proposal of the utility model is that:
an energy-saving flue desulfurization device comprises a storage bin, a feeder and a discharging shoe which are connected in sequence; also comprises a bag-type dust collector; the bag-type dust collector is connected with an air preheater of the boiler through a first flue; a first desulfurization spraying point is arranged on a second flue between a high-temperature economizer and a low-temperature economizer of the boiler, a second desulfurization spraying point is arranged on the first flue and close to a bag-type dust remover, a first distributor for powder conveying and distribution is arranged at the first desulfurization spraying point, and a second distributor for powder conveying and distribution is arranged at the second desulfurization spraying point; the first distributor and the second distributor are connected with a powder outlet of the blanking boot through powder conveying pipelines.
Preferably, the flue gas temperature at the first desulfurization injection point is 310 ℃ to 380 ℃; the flue gas temperature at the second desulfurization injection point is 150 ℃ to 180 ℃, most preferably the flue gas temperature at the first desulfurization injection point is 350 ℃, and most preferably the flue gas temperature at the second desulfurization injection point is 150 ℃.
Preferably, the first distributor is Y-shaped and comprises a first powder supply end and two first injection ends, the first powder supply end is connected with the powder outlet of the blanking boot, and a first spray gun is arranged at the end of the first injection end.
Preferably, the second distributor is Y-shaped and includes a second powder supply end and a second spraying end, the second powder supply end is connected to the powder outlet of the blanking boot, and a second spray gun is disposed at an end of the second spraying end.
Preferably, the front end of the storage bin is also provided with a hopper, and a vacuum feeding machine is arranged between the hopper and the storage bin; the top of the storage bin is provided with a dust remover, the storage bin is internally provided with a non-radioactive material level meter, and the bottom of the storage bin is provided with an electric gate valve.
Preferably, a manhole and an emergency exhaust valve are further arranged at the top of the storage bin.
Preferably, a buffer bin is further arranged between the bin and the feeder.
Preferably, the feeding machine is a feeding machine with adjustable feeding amount, and the adjusting range of the feeding amount of the feeding machine is 0-100%; the metering precision of the feeder is +/-0.5%; the control precision of the feeder is +/-1%.
The utility model has the advantages that:
firstly, the method comprises the following steps: the desulfurization efficiency is high and can be compared favorably with a wet process; the space flue gas flow velocity of the economizer air preheater is utilized to be slow, the mixing effect is good, and the reaction time is long; by utilizing the influence of temperature on the adsorption performance of the desulfurizer (lime), the injection points are arranged near 350 ℃ and 150 ℃, the pertinence is strong, and the adsorption effect and efficiency are ensured;
secondly, the method comprises the following steps: the engineering investment cost, the operation cost and the desulfurization cost are low; the utility model has the advantages that the structure of the original smoke exhaust pipeline is not required to be changed, a reactor is not required to be added, the occupied area is small, the system arrangement is flexible, the system is very suitable for reconstruction and new projects lacking in fields, the reconstruction cost is low, and meanwhile, the desulfurizer is less in use amount and low in desulfurization cost due to high adsorption efficiency and good adsorption effect;
thirdly, the method comprises the following steps: the utility model has simple process flow, less equipment and reduced maintenance and overhaul cost;
fourthly: the utility model has low energy consumption which is 30-50% of the wet process;
fifth, the method comprises the following steps: the utility model carries out three-time desulfurization on the flue gas, and the first time is the flue gas temperature near 350 ℃; in the process that the incompletely desulfurized flue gas enters the bag-type dust remover along with the first flue, the temperature of the flue gas is gradually reduced, when the temperature is about 150 ℃, the second desulfurization is carried out by utilizing a desulfurizing agent (lime), after the second desulfurization is finished, the flue gas reaches the bag-type dust remover, a dust cake layer on the surface of the bag-type dust remover provides an excellent acid gas reaction bed, the reaction is further carried out, the third desulfurization is finished, and the efficiency of the third desulfurization can reach more than 99%;
sixth: the utility model can effectively remove harmful gases such as acid substances, reduce the corrosivity to equipment, improve the thermal efficiency and avoid complex temperature reduction and rise;
seventh: the adaptability to the change of the boiler load is strong, the load tracking characteristic is good, and the start and the stop are convenient;
eighth: no desulfurization waste water is discharged, and the desulfurization by-product is in a dry state, so that secondary pollution is avoided, and comprehensive utilization, disposal and stacking are facilitated;
ninth: the system has less heat loss, can recover a large amount of heat energy and has obvious energy-saving effect.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
FIG. 2 is an experimental test chart of factors affecting the adsorption performance of a desulfurizing agent (lime).
In the figure: 1 is a storage bin, 1.1 is a dust remover, 1.2 is a non-radioactive level gauge, 1.3 is an electric gate valve, 1.4 is a manhole, 2 is a feeder, 3 is a blanking shoe, 4 is a bag-type dust remover, 5 is a first flue, 5.1 is a first desulfurization spray point, 5.2 is a second desulfurization spray point, 6 is a first distributor, 6.1 is a first powder supply end, 6.2 is a first spray end, 6.3 is a first spray gun, 7 is a second distributor, 7.1 is a second powder supply end, 7.2 is a second spray end, 7.3 is a second spray gun, 8 is a hopper, 9 is a vacuum feeder, 10 is a buffer bin, 11 is a ton bag, 12 is an electric block, 13 is a fan, 14 is a powder supply pipe, 15 is a boiler, 15.1 is a high-temperature economizer, 15.2 is a low-temperature economizer, 15.3 is an empty preheater, 16 is a second flue.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
Example 1:
an energy-saving flue desulfurization device comprises a storage bin 1, a feeder 2 and a discharging shoe 3 which are connected in sequence; also comprises a bag-type dust collector 4; the bag-type dust collector 4 is connected with an air preheater 15.3 of the boiler 15 through a first flue 5; a first desulfurization injection point 5.1 is arranged on a second flue 16 between a high-temperature economizer 15.1 and a low-temperature economizer 15.2 of the boiler 15, a second desulfurization injection point 5.2 is arranged on the first flue 5 at a position close to the bag-type dust collector 4, a first distributor 6 for powder conveying and distribution is arranged at the first desulfurization injection point 5.1, and a second distributor 7 for powder conveying and distribution is arranged at the second desulfurization injection point 5.2; the first distributor 6 and the second distributor 7 are both connected with the powder outlet of the blanking boot 3 through a powder feeding pipeline 14.
Preferably, the flue gas temperature at the first desulfurization injection point 5.1 is 310 ℃ to 380 ℃; the flue gas temperature at the second desulfurization injection point 5.2 is 150 ℃ to 180 ℃, most preferably the flue gas temperature at the first desulfurization injection point 5.1 is 350 ℃, and most preferably the flue gas temperature at the second desulfurization injection point 5.2 is 150 ℃.
Preferably, the first distributor 6 is Y-shaped, and includes one first powder supply end 6.1 and two first injection ends 6.2, the first powder supply end 6.1 is connected to the powder outlet of the discharging shoe 3, and the end of the first injection end 6.2 is provided with a first spray gun 6.3.
Preferably, the second distributor 7 is Y-shaped and includes a second powder supply end 7.1 and a second spraying end 7.2, the second powder supply end 7.1 is connected to the powder outlet of the blanking shoe 3, and a second spray gun 7.3 is disposed at an end of the second spraying end 7.2.
Preferably, the front end of the storage bin 1 is also provided with a hopper 8, and a vacuum feeding machine 9 is arranged between the hopper 8 and the storage bin 1; the top of the storage bin 1 is provided with a dust remover 1.1, the storage bin 1 is internally provided with a non-radioactive material level meter 1.2, and the bottom of the storage bin 1 is provided with an electric gate valve 1.3.
Preferably, a manhole 1.4 and an emergency exhaust valve are further arranged at the top of the storage bin 1.
Preferably, a buffer bin 10 is further arranged between the bin 1 and the feeder 2.
Preferably, the feeding machine 2 is a feeding machine with adjustable feeding amount, and the adjusting range of the feeding amount of the feeding machine 2 is 0-100%; the metering precision of the feeder 2 is +/-0.5%; the control precision of the feeder 2 is +/-1%.
The basis of the utility model is the experimental test chart of the factors influencing the adsorption performance of the desulfurizer (lime) shown in the attached figure 2, the air humidity at the position A is dry; the curve B, the curve C and the curve D respectively correspond to the influence of the temperature on the adsorption performance of the desulfurizer (lime) when the air humidity is 5%, the air humidity is 15% and the air humidity is 25%; as can be seen from the figure, the adsorption performance of the desulfurizing agent (lime) reaches the best at the temperature of 150 ℃ and 350 ℃; arranging thermometers on the first flue 5 and the second flue 16, and testing the temperature of the flue gas in the first flue 5 and the second flue 16; the desulfurization spraying points are arranged near the flue gas temperature of 150 ℃ and near 350 ℃, so that the adsorption performance of the desulfurizer (lime) reaches the best, and therefore, the utility model has strong pertinence, good adsorption effect, high efficiency, low engineering investment cost, operation cost and desulfurization cost; need not to change the structure of original exhaust pipe, also need not to add and put reactor etc. area is little, and the system layout is nimble, is fit for very much reforming transform and the new project that the place is in short supply, reforms transform with low costsly, simultaneously because absorption efficiency is high, adsorption effect is good therefore the desulfurizer use amount is few, and the desulfurization is with low costs.
In addition, the utility model can realize the functions of automatic feeding and automatic spraying by matching with the PLC control system; hoisting a ton bag 11 to the upper part of a hopper 8 through an electric hoist 12, putting a desulfurizing agent (lime) into the hopper 8, and connecting a vacuum feeding machine 9, a non-radioactive level indicator 1.2, an electric gate valve 1.3, a dust collector 1.1, a feeding machine 2, a fan 13 connected with a discharging boot 3, a first spray gun 6.3, a second spray gun 7.3 and the like with a PLC control system; according to the material level information in the storage bin 1 transmitted by the non-radioactive material level meter 1.2, once the material level is lower than a set value, the PLC control system controls the vacuum feeding machine 9 to automatically feed materials; meanwhile, the PLC control system can control the electric gate valve 1.3 to automatically discharge materials into the buffer bin 10, and the buffer bin 10 can play a role in buffer scheduling, so that a desulfurizing agent (lime) is prevented from blocking a feed inlet of the feeder 2; the feeder 2 is a feeder with adjustable feeding amount, can be directly purchased from the market (such as model NTD 32-18), and can further effectively save the using amount of the desulfurizer (lime).
The described embodiments are only some, but not all embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Claims (8)
1. An energy-saving flue desulfurization device comprises a storage bin, a feeder and a discharging shoe which are connected in sequence; also comprises a bag-type dust collector; the method is characterized in that: the bag-type dust collector is connected with an air preheater of the boiler through a first flue; a first desulfurization spraying point is arranged on a second flue between a high-temperature economizer and a low-temperature economizer of the boiler, a second desulfurization spraying point is arranged on the first flue and close to a bag-type dust remover, a first distributor for powder conveying and distribution is arranged at the first desulfurization spraying point, and a second distributor for powder conveying and distribution is arranged at the second desulfurization spraying point; the first distributor and the second distributor are connected with a powder outlet of the blanking boot through powder conveying pipelines.
2. The energy-saving flue desulfurization apparatus according to claim 1, characterized in that: the flue gas temperature of the first desulfurization injection point is 310-380 ℃; the flue gas temperature of the second desulfurization spraying point is 150-180 ℃.
3. The energy-saving flue desulfurization apparatus according to claim 1, characterized in that: the first distributor is Y-shaped and comprises a first powder supply end and two first injection ends, the first powder supply end is connected with a powder outlet of the discharging boot, and a first spray gun is arranged at the end part of the first injection end.
4. The energy-saving flue desulfurization apparatus according to claim 1, characterized in that: the second distributor is Y-shaped and comprises a one-way second powder supply end and two-way second spraying ends, the second powder supply end is connected with a powder outlet of the discharging boot, and a second spray gun is arranged at the end part of the second spraying end.
5. The energy-saving flue desulfurization apparatus according to claim 1, characterized in that: the front end of the bin is also provided with a hopper, and a vacuum feeding machine is arranged between the hopper and the bin; the top of the storage bin is provided with a dust remover, the storage bin is internally provided with a non-radioactive material level meter, and the bottom of the storage bin is provided with an electric gate valve.
6. The energy-saving flue desulfurization apparatus according to claim 1 or 5, characterized in that: and the top of the storage bin is also provided with a manhole and an emergency exhaust valve.
7. The energy-saving flue desulfurization apparatus according to claim 1, characterized in that: and a buffer bin is also arranged between the stock bin and the feeder.
8. The energy-saving flue desulfurization apparatus according to claim 1 or 7, characterized in that: the feeding machine is capable of adjusting the feeding amount, and the adjusting range of the feeding amount of the feeding machine is 0-100%; the metering precision of the feeder is +/-0.5%; the control precision of the feeder is +/-1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922438763.5U CN212166999U (en) | 2019-12-30 | 2019-12-30 | Energy-saving flue desulphurization unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922438763.5U CN212166999U (en) | 2019-12-30 | 2019-12-30 | Energy-saving flue desulphurization unit |
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| CN212166999U true CN212166999U (en) | 2020-12-18 |
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| CN201922438763.5U Active CN212166999U (en) | 2019-12-30 | 2019-12-30 | Energy-saving flue desulphurization unit |
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