CN111087162A - Sludge drying coupling low-nitrogen combustion system - Google Patents
Sludge drying coupling low-nitrogen combustion system Download PDFInfo
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- CN111087162A CN111087162A CN202010022997.6A CN202010022997A CN111087162A CN 111087162 A CN111087162 A CN 111087162A CN 202010022997 A CN202010022997 A CN 202010022997A CN 111087162 A CN111087162 A CN 111087162A
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- Prior art keywords
- sludge
- sludge drying
- drying machine
- flue
- air
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
Abstract
The utility model provides a sludge drying coupling low-nitrogen combustion system, including combustion boiler, sludge drying machine, with dry sludge warehouse, the wet sludge warehouse that the sludge drying machine communicates, the air inlet of sludge drying machine with the flue of combustion boiler is linked together, in order with flue gas in the flue lets in the sludge drying machine to it is right with the mode of direct heat transfer sludge in the sludge drying machine dries, the gas outlet of sludge drying machine with the combustion boiler is linked together. SO arranged, SO in the flue gas2The acidic gas reacts with the moisture in the sludge to generate acidic liquid, and the acidic liquid can react with salt substances in the sludge to generate sulfate, nitrate and the like and is retained in the sludge, so that the content of the acidic gas in the tail gas of the sludge drier is reduced, and low-temperature corrosion of equipment can be prevented to a great extent; after the flue gas passes through the sludge drier, the oxygen content of the flue gas does not change greatly, and the flue gas can still be introduced into a combustion boilerTo reduce the emission of nitrogen oxides.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a sludge drying coupling low-nitrogen combustion system.
Background
The prior art has a boiler tail gas circulation system, and it draws the partial flue gas after boiler burning and purification to the air feed mouth of boiler in, become the recirculated flue gas, because the oxygen content of recirculated flue gas is less than 6%, easily makes the state that the buggy is in the oxygen deficiency burning in the furnace, and then can adjust furnace temperature to can effectively control nitrogen oxide's production, with the emission that reduces nitrogen oxide.
However, the extracted recirculated flue gas contains acidic gases, e.g., SO2、NOxAnd the acidic liquid is easy to condense and separate out after being mixed with cold air for cooling, so that the corrosion is generated on equipment such as pipelines, coal mills, combustors and the like, and the service life of the equipment is influenced.
Therefore, how to provide a solution to overcome the above-mentioned drawbacks remains a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a sludge drying coupling low-nitrogen combustion system, which can reduce acid gas in recycled flue gas to prevent low-temperature corrosion to a greater extent and can meet the technical requirements of low-nitrogen combustion while realizing rapid drying of sludge, reduction in the volume of a sludge drying machine and reduction in investment and operating cost.
In order to solve the technical problem, the invention provides a sludge drying coupling low-nitrogen combustion system which comprises a combustion boiler, a sludge drying machine, a dry sludge bin and a wet sludge bin, wherein the dry sludge bin and the wet sludge bin are communicated with the sludge drying machine, an air inlet of the sludge drying machine is communicated with a flue of the combustion boiler so as to introduce flue gas in the flue into the sludge drying machine and dry sludge in the sludge drying machine in a direct heat exchange mode, and an air outlet of the sludge drying machine is communicated with the combustion boiler.
By adopting the structure, the flue gas in the flue of the combustion boiler can be introduced into the sludge drier to be mixed with the sludge so as to carry out direct heat exchange, the heat exchange efficiency of the direct heat exchange process is high, and the direct heat exchange process can be carried outThe waste heat of the flue gas is fully utilized to dry the sludge, so that the drying treatment of the sludge is realized; SO in flue gas2The acidic gas reacts with the moisture in the sludge to generate acidic liquid, and the acidic liquid can react with salt substances in the sludge to generate sulfate, nitrate and the like, and then the acidic liquid is retained in the sludge, so that the content of the acidic gas in the tail gas of the sludge drier can be obviously reduced, and low-temperature corrosion of equipment such as pipelines, coal mills, combustors and the like can be prevented to a great extent.
Moreover, because the temperature of the flue gas is higher, compared with the normal-temperature air used as carrier gas, the temperature of the environment at the dome part of the bin cover of the sludge drier can be increased, the secondary condensation of the water evaporated from the sludge at the dome part can be effectively avoided, and the operating efficiency of the drier can be improved.
In addition, because the oxygen content of the flue gas is lower, usually only 3% -5%, far lower than the air, basically there is no explosion risk, can improve the air-carrying capacity by a wide margin, make the partial pressure of the vapor in the drier reduce, help the rapid drying of the mud, compare with conventional drier, the heat transfer area when reaching the same heat transfer effect can reduce about 15% -20%, the weight of the whole apparatus, the volume can reduce about 12% -17%, and then can facilitate transportation and installation, and help to reduce the operation energy consumption of the apparatus, the economy of the apparatus operation can be higher.
After the flue gas passes through the sludge drier, the oxygen content of the flue gas is not changed greatly, and the flue gas can still play the effects of reducing the temperature of a hearth and reducing the emission of nitrogen oxides by introducing the part of the flue gas into a combustion boiler.
Optionally, the system further comprises a tail gas treatment device, wherein the tail gas treatment device is arranged between the gas outlet and the combustion boiler.
Optionally, the tail gas treatment equipment comprises a dust removal device and a dehumidification device.
Optionally, the dust removing device is a dry dust removing device, and an ash hopper of the dry dust removing device is connected with the dry sludge bin.
Optionally, an air preheater is arranged in the flue, and the connection position of the air inlet and the flue is located at the downstream of the air preheater.
Optionally, the temperature of the flue gas introduced into the sludge drier is 120-130 ℃; and/or the amount of the flue gas introduced into the sludge drier is 1.2 to 1.6 times of the evaporation amount of the water in the sludge.
Optionally, the system further comprises a coal feeding device, an air inlet of the coal feeding device is connected with a main air pipe, an outlet of the air preheater and an air outlet of the air preheater are both connected with the main air pipe, and an air outlet of the coal feeding device is connected with a burner of the combustion boiler.
Optionally, the air supply system further comprises an air supply device, and the air supply device is connected with the inlet of the air preheater and the main air pipe.
Optionally, the system further comprises indirect heat exchange equipment, wherein the indirect heat exchange equipment is connected with the sludge drying machine to dry the sludge in the sludge drying machine in an indirect heat exchange mode.
Optionally, indirect heat transfer equipment includes steam jar and header tank, the steam jar be used for to sludge drying machine lets in steam, the header tank is used for collecting water after the steam condensation.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a sludge drying coupled low-nitrogen combustion system provided by the invention.
The reference numerals in fig. 1 are explained as follows:
1 combustion boiler, 11 burner;
2, a sludge drier, a 21 dry sludge bin and a 22 wet sludge bin;
3 tail gas treatment equipment, 31 dust removal devices, 32 dehumidification devices and 321 sewage tanks;
4, an air preheater;
5, coal feeding equipment;
6, air supply equipment;
7 indirect heat exchange equipment, 71 steam cylinders and 72 water collecting tanks.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a sludge drying coupled low-nitrogen combustion system provided in the present invention.
As shown in figure 1, the invention provides a sludge drying coupling low-nitrogen combustion system, which comprises a combustion boiler 1 and a sludge drying machine 2, wherein the sludge drying machine 2 is also communicated with a dry sludge bin 21 and a wet sludge bin 22, an air inlet of the sludge drying machine 2 is communicated with a flue of the combustion boiler 1 so as to introduce flue gas in the flue into the sludge drying machine 2 and dry sludge in the sludge drying machine 2 in a direct heat exchange manner, and an air outlet of the sludge drying machine 2 is communicated with the combustion boiler 1.
By adopting the structure, the flue gas in the flue of the combustion boiler 1 can be introduced into the sludge drier 2 to be mixed with the sludge for direct heat exchange, the heat exchange efficiency of the direct heat exchange process is high, the waste heat of the flue gas can be fully utilized to dry the sludge, and the drying treatment of the sludge is further realized; SO in flue gas2The acidic gas reacts with the moisture in the sludge to generate acidic liquid, and the acidic liquid reacts with salt substances in the sludge to generate sulfate, nitrate and the like, and then the acidic liquid is retained in the sludge, so that the content of the acidic gas in the tail gas of the sludge drier 2 can be obviously reduced, and low-temperature corrosion of pipelines, coal mills, combustors and other equipment can be prevented to a greater extent.
Moreover, because the temperature of the flue gas is higher, compared with the normal-temperature air used as carrier gas, the environment temperature at the dome part of the bin cover of the sludge drier 2 can be improved, the secondary condensation of the moisture evaporated from the sludge at the dome part can be effectively avoided, and the operation efficiency of the drier can be improved.
In addition, the conventional direct sludge drying process is limited by the risk of explosion inside the drying machine because air is introduced as a drying carrier gas, and the drying speed is slow because too much air as the carrier gas cannot be introduced. The oxygen content of the flue gas is lower, usually only 3% -5%, far lower than the air, basically, there is no explosion risk, can improve the air-carrying capacity by a wide margin, make the partial pressure of water vapor in the drier reduce, is favorable to the rapid drying of mud, compare with conventional drier, the heat transfer area when reaching the same heat transfer effect can reduce about 15% -20%, the weight of the whole apparatus, the volume can reduce about 12% -17%, and then can facilitate transportation and installation, and is favorable to reducing the operation energy consumption of the apparatus, the economy of the apparatus operation can be higher.
After the flue gas passes through the sludge drier 2, the oxygen content of the flue gas does not change greatly, and when the part of the gas is sent into a coal feeder 5 in the following to dry and transport pulverized coal and send the pulverized coal into the combustion boiler 1, the effects of reducing the temperature of a hearth and reducing the emission of nitrogen oxides can be still achieved, so that the characteristics of tail gas discharged by the sludge drier 2 are comprehensively considered, and the part of the tail gas is better utilized.
In addition, in the prior art, one treatment method for the dried sludge is to introduce the dried sludge into the combustion boiler 1 for combustion, but because the heat value of the sludge is low, combustion delay is caused when the sludge is mixed into the combustion boiler 1 for combustion, so that the problem of increase of the emission amount of nitrogen oxides is caused. Therefore, the sludge drying coupled low-nitrogen combustion system provided by the invention can better solve the problems so as to eliminate hidden troubles caused by sludge co-combustion as far as possible, and thus, the sludge co-combustion technology can be better popularized and used.
Further, the tail gas treatment device 3 can be further included, and the tail gas treatment device 3 can be arranged between the gas outlet of the sludge drying machine 2 and the combustion boiler 1 so as to treat the tail gas of the sludge drying machine 2.
The above-mentioned off-gas treatment apparatus 3 may include a dust removing device 31 and a dehumidifying device 32.
The dust removal device 31 is used for removing dust in the tail gas, can improve the purity of gas entering the combustion boiler, and can avoid the problems of dust deposition and coking on a water-cooled wall of the boiler to a greater extent. The dust removing device 31 can be a dry dust removing device or a wet dust removing device, and can be selected according to actual needs; in the case of a dry dust collector, as shown in fig. 1, the dust hopper may be connected to a dry sludge bin 21 to reduce the number of dust collecting bins.
The dehumidifier 32 may be a condenser or a device such as a labyrinth demister, and a sewage tank 321 may be connected to a lower end thereof to discharge and collect the wastewater in the dehumidifier 32 in time.
It should be noted that when the dust removing device 31 is a wet dust removing device, it can be connected to the sewage tank 321 of the dehumidifying device 32, which in turn can reduce the number of sewage collecting tanks.
In fact, the temperature of the flue gas in the flue is relatively high, and if the flue gas is directly introduced into the sludge drying machine 2, organic matters in the sludge can be damaged, so that the heat value of the sludge is influenced, and the subsequent treatment of the sludge is not facilitated.
Therefore, the air preheater 4 can be arranged in the flue, the structure of the air preheater 4 can refer to the prior art, and is not limited herein, and the connecting position of the air inlet and the flue can be located at the downstream of the air preheater 4, so that the temperature of the flue gas introduced into the sludge drier 2 can be reduced. Specifically, the temperature of the flue gas introduced into the sludge drying machine 2 can be controlled to be 120-130 ℃, so that the drying efficiency of the flue gas on the sludge can be ensured, and meanwhile, the damage to sludge organic matters can be avoided to a greater extent.
It can be known that the air preheater 4 is a conventional device in a flue gas treatment system, that is, the sludge drying coupled low-nitrogen combustion system provided by the invention is not added with too many devices actually, and the existing devices are organically combined, so that the implementation cost of the system can be lower, and the system is more convenient to popularize and use.
The amount of the flue gas introduced into the sludge drier 2 can be 1.2 to 1.6 times of the water evaporation amount of the sludge, wherein the flue gas amount and the water evaporation amount refer to the amount in unit time. It can be understood that the above proportional relationship is not absolute, and actually has a relationship with flue gas temperature, sludge water content, sludge addition amount, and the like, and in specific practice, a person skilled in the art can adjust the proportional relationship according to actual conditions to meet actual sludge drying requirements as a target.
In the prior art, the flue gas at the outlet of the air preheater 4 is a low-quality heat source, which can be used as a low-temperature economizer conventionally only, and the heat utilization rate is less than 10%.
The upper reaches of combustion boiler 1 can be equipped with coal feeding equipment 5, coal feeding equipment 5 specifically can be coal pulverizer etc. for combustion boiler 1 provides the buggy, coal feeding equipment 5's air intake can be connected with the total tuber pipe, the export of air preheater 4, sludge drying machine 2's gas outlet all can link to each other with the total tuber pipe, sludge drying machine 2 exhaust tail gas is because the temperature is lower (about 45 ℃), mix the back with the gas of air preheater 4 export, can adjust the temperature of the gas that gets into coal feeding equipment 5, in order to satisfy the dry demand of buggy.
The combustion boiler 1 may further include an air supply device 6, the air supply device 6 may specifically be a fan or the like for providing cold air, the air supply device 6 may be connected to an inlet of the air preheater 4 to provide air required by the air preheater 4, and meanwhile, the air supply device 6 may be further connected to a main air duct to provide cold air into the main air duct to adjust the temperature of the gas entering the coal supply device 5, and an air outlet of the coal supply device 5 may be connected to the burner 11 of the combustion boiler 1.
Because the tail gas of the sludge drying machine 2 is converged, a certain amount of air with lower temperature is actually provided, so that the air quantity provided by the air supply equipment 6 to the main air pipe can be reduced, namely, the total amount of cold air can be reduced, and because the total amount of cold air is reduced, the air supply equipment 6 can adopt a low-power fan, and the cost of the equipment can be reduced.
Similar to the components of the flue gas entering the sludge drier 2, the oxygen content in the tail gas of the sludge drier 2 is lower, and after the tail gas is mixed with the hot air exhausted by the air preheater 4 and the cold air provided by the air supply device 6, the oxygen content of the air entering the coal supply device 5 is still lower than the oxygen content in the air, about 14-17%, so that the operation safety of the coal supply device 5 can be improved, the oxygen content of a main combustion area of a boiler can be reduced, pulverized coal is combusted in a reducing atmosphere, the generation of nitrogen oxides can be inhibited, and the aim of low-nitrogen combustion is finally fulfilled.
Further, indirect heat exchange equipment 7 can be further included, and the indirect heat exchange equipment 7 can be connected with the sludge drying machine 2 so as to dry the sludge in the sludge drying machine 2 in an indirect heat exchange mode. This indirect heat exchange equipment 7 cooperates the aforesaid flue gas that directly mixes with mud, can carry out the drying to mud better.
Specifically, indirect heat exchange equipment 7 can include steam cylinder 71 and header tank 72, and steam cylinder 71 is used for letting in steam to sludge drying machine 2, and steam and the mud in sludge drying machine 2 carry out indirect heat transfer after, can condense to water, and release latent heat, and this part latent heat can transmit the mud in sludge drying machine 2 through heat-conducting mode, to heat the mud and heat up, and impel the moisture evaporation, and header tank 72 can be used to collect the water after the steam condensation, so that the cyclic utilization of water resource.
The sludge drying coupled low-nitrogen combustion system provided by the invention is a totally-enclosed system, tail gas discharged by the sludge drying machine 2 directly enters the combustion boiler 1 after passing through the tail gas treatment equipment 3 and the coal supply equipment 5, so that the leakage of organic odor factors can be avoided to a greater extent, and the environmental health around the equipment can be ensured.
The embodiment of the invention is not limited to the specific structures of the combustion boiler 1, the sludge drier 2 and other equipment, and in the implementation, a person skilled in the art can select the equipment according to the actual needs. Further, each gas line may be provided with a wind power driving device such as a fan, an air volume monitoring device, an air volume adjusting device, an air temperature monitoring device, and the like as needed, which are conventional in the art and are not limited in detail herein.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (10)
1. The utility model provides a low nitrogen combustion system of sludge drying coupling, includes combustion boiler (1), its characterized in that, still include sludge drying machine (2) and with dry sludge warehouse (21), wet sludge warehouse (22) that sludge drying machine (2) are linked together, the air inlet of sludge drying machine (2) with the flue of combustion boiler (1) is linked together, in order with flue gas in the flue lets in sludge drying machine (2) to it is right with the mode of direct heat transfer sludge in sludge drying machine (2) dries, the gas outlet of sludge drying machine (2) with combustion boiler (1) is linked together.
2. The sludge drying coupled low-nitrogen combustion system according to claim 1, further comprising a tail gas treatment device (3), wherein the tail gas treatment device (3) is arranged between the gas outlet and the combustion boiler (1).
3. The sludge drying coupled low-nitrogen combustion system according to claim 2, wherein the tail gas treatment device (3) comprises a dust removal device (31) and a dehumidification device (32).
4. The sludge drying coupled low-nitrogen combustion system as claimed in claim 3, wherein the dust removing device (31) is a dry dust removing device, and an ash bucket of the dry dust removing device is connected with the dry sludge bin (21).
5. The sludge drying coupled low-nitrogen combustion system according to any one of claims 1 to 4, wherein an air preheater (4) is arranged in the flue, and the connection position of the air inlet and the flue is located at the downstream of the air preheater (4).
6. The sludge drying coupled low-nitrogen combustion system as claimed in claim 5, wherein the temperature of the flue gas introduced into the sludge drying machine (2) is 120-130 ℃; and/or the presence of a gas in the gas,
the amount of the flue gas introduced into the sludge drier (2) is 1.2 to 1.6 times of the evaporation amount of the water in the sludge.
7. The sludge drying coupling low-nitrogen combustion system according to claim 5, further comprising a coal feeding device (5), wherein an air inlet of the coal feeding device (5) is connected with a main air pipe, an outlet of the air preheater (4) and an air outlet of the air preheater are both connected with the main air pipe, and an air outlet of the coal feeding device (5) is connected with a burner (11) of the combustion boiler (1).
8. The sludge drying coupled low-nitrogen combustion system according to claim 7, further comprising an air supply device (6), wherein the air supply device (6) is connected with an inlet of the air preheater (4) and the main air pipe.
9. The sludge drying coupled low-nitrogen combustion system according to claim 5, further comprising an indirect heat exchange device (7), wherein the indirect heat exchange device (7) is connected with the sludge drying machine (2) to dry the sludge in the sludge drying machine (2) in an indirect heat exchange manner.
10. The sludge drying coupled low-nitrogen combustion system according to claim 9, wherein the indirect heat exchange device (7) comprises a steam cylinder (71) and a water collection tank (72), the steam cylinder (71) is used for introducing steam into the sludge drying machine (2), and the water collection tank (72) is used for collecting water after the steam is condensed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010022997.6A CN111087162A (en) | 2020-01-09 | 2020-01-09 | Sludge drying coupling low-nitrogen combustion system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010022997.6A CN111087162A (en) | 2020-01-09 | 2020-01-09 | Sludge drying coupling low-nitrogen combustion system |
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| CN111087162A true CN111087162A (en) | 2020-05-01 |
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| CN202010022997.6A Pending CN111087162A (en) | 2020-01-09 | 2020-01-09 | Sludge drying coupling low-nitrogen combustion system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112880382A (en) * | 2021-02-01 | 2021-06-01 | 大唐环境产业集团股份有限公司 | Sludge steam drying system utilizing recycled flue gas |
| CN113666604A (en) * | 2021-09-14 | 2021-11-19 | 西安热工研究院有限公司 | System for drying sludge by using waste heat of boiler |
-
2020
- 2020-01-09 CN CN202010022997.6A patent/CN111087162A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112880382A (en) * | 2021-02-01 | 2021-06-01 | 大唐环境产业集团股份有限公司 | Sludge steam drying system utilizing recycled flue gas |
| CN113666604A (en) * | 2021-09-14 | 2021-11-19 | 西安热工研究院有限公司 | System for drying sludge by using waste heat of boiler |
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