CN211146501U - Sludge spray drying and incineration synergistic desulfurization device - Google Patents
Sludge spray drying and incineration synergistic desulfurization device Download PDFInfo
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- CN211146501U CN211146501U CN201921801513.7U CN201921801513U CN211146501U CN 211146501 U CN211146501 U CN 211146501U CN 201921801513 U CN201921801513 U CN 201921801513U CN 211146501 U CN211146501 U CN 211146501U
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Abstract
The utility model provides a mud spraying mummification burns desulfurated device in coordination, include: the sludge mixing device comprises a first sludge storage tank, a plunger pump, a sludge filter, a sludge mixing machine, a second sludge storage tank and a lime storage bin, wherein the first sludge storage tank, the plunger pump, the sludge filter, the sludge mixing machine and the second sludge storage tank are sequentially connected; the spray drying tower comprises an air compressor, a spray drying tower, a cyclone dust collector, a chain conveyor, a rotary kiln, a secondary combustion chamber and an air distribution system which are sequentially connected with a discharge port of the chain conveyor, and a primary combustor and a secondary combustor which are respectively connected with the rotary kiln and the secondary combustion chamber, wherein the top of the spray drying tower is respectively connected with a second sludge storage tank, the air compressor and the air distribution system, and the bottom and the lower part of the spray drying tower are respectively connected with the chain conveyor and the cyclone dust collector; the device comprises a bag-type dust collector, an induced draft fan, a wet desulphurization tower and a chimney which are connected in sequence; and the ash residue tank is connected with the slag discharge port of the rotary kiln. The device can realize semi-dry desulfurization of the flue gas while drying the sludge, realize dry desulfurization in the furnace while burning the sludge, and avoid the resynthesis of dioxin in the flue gas.
Description
Technical Field
The utility model relates to a sludge drying burns technical field, especially relates to a sludge spray drying burns desulfurization in coordination device.
Background
The sludge incineration flue gas is discharged, and the atmospheric pollutants such as sulfur dioxide and the like need to be removed. The commonly used methods for removing sulfides in flue gas include wet desulfurization, semi-dry desulfurization, in-furnace desulfurization and the like.
During semi-dry desulfurization, atomized water needs to be sprayed into a semi-dry desulfurization tower, and the function of the atomized water is to increase the chemical reaction contact area of sulfur dioxide and lime powder in flue gas and accelerate the reaction speed; and meanwhile, the water spraying amount is required to be controlled well, no liquid water appears, and the tower wall is ensured not to be stained with water vapor. The conventional semi-dry desulfurization has the following problems: firstly, the size control of the water spray volume is not accurate enough, can not adapt to the change of flue gas state in the desulfurizing tower, causes the water spray too much easily and leads to the scale deposit of desulfurizing tower inner wall and produce sewage, perhaps water spray too little leads to the desulfurization insufficient. Secondly, flue gas in the desulfurizing tower forms higher ascending velocity after passing through the venturi tube, high-concentration dust formed by mixing the flue gas and suspended particles of slaked lime for desulfurization erodes the spray gun at a very high speed (20-30 m/s), and the head and the nozzle part of the spray gun are easy to wear.
The principle of the circulating fluidized bed boiler is that fuel and limestone powder as absorbent are simultaneously fed into a combustion chamber, air flow makes fuel particles, the limestone powder and ash be intensively disturbed in the circulating fluidized bed and fill the combustion chamber, the limestone powder is cracked into calcium oxide in the combustion chamber, and the calcium oxide and sulfur dioxide are combined into calcium sulfate.
The traditional sludge drying unit and the traditional desulfurization unit are independent, and if the synergy can be realized, the configuration of equipment can be reduced, the occupied area is reduced, and the engineering investment is reduced.
On the other hand, in the traditional sludge drying incineration, an independent device for quenching flue gas to avoid dioxin synthesis, such as a quenching tower, is required to be arranged on the incinerated flue gas.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide a device for sludge spray drying incineration and desulfurization, which can realize semidry desulfurization of flue gas while sludge drying, dry desulfurization in a furnace while sludge incineration, and rapid cooling of high-temperature flue gas after contact with wet sludge in a drying tower, thereby avoiding the resynthesis of dioxin in the flue gas; the spray-dried sludge has small particles and is burnt thoroughly in the rotary kiln. The device can realize sludge drying and incineration and ultralow pollutant emission.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides a pair of mud spraying mummification burns desulfurated device in coordination, a serial communication port, include:
the sludge storage and pretreatment unit comprises a first sludge storage tank, a plunger pump, a sludge filter, a sludge mixing machine and a second sludge storage tank which are sequentially connected, and a lime storage bin connected with the sludge mixing machine;
the sludge spray drying incineration coordinated desulfurization unit comprises an air compressor, a spray drying tower, a cyclone dust collector, a chain conveyor, a rotary kiln, a secondary combustion chamber and an air distribution system which are sequentially connected with a discharge port of the chain conveyor, and a primary combustor and a secondary combustor which are respectively connected with the rotary kiln and the secondary combustion chamber; a sludge atomization nozzle is arranged at the top in the spray drying tower, and is connected with a sludge outlet of the second sludge storage tank through a screw pump and connected with the air compressor; the spray drying tower is provided with a flue gas inlet connected with an air distribution system air outlet, a dry sludge discharge port connected with a chain conveyor feed inlet and a tail gas outlet connected with a cyclone dust collector feed inlet at the top, the bottom and the lower part respectively, and the cyclone dust collector is provided with an air outlet and a dry sludge outlet connected with the chain conveyor feed inlet;
the flue gas purification unit comprises a bag-type dust remover, an induced draft fan, a wet desulphurization tower and a chimney which are connected in sequence; the air inlet of the bag-type dust collector is connected with the air outlet of the cyclone dust collector;
and the ash slag tank is connected with the slag discharge port of the rotary kiln.
And further, an activated carbon injection fan connected with the powdered activated carbon storage tank is arranged between the cyclone dust collector and the bag-type dust collector.
Further, an ozone generator is arranged between the bag-type dust collector and the induced draft fan.
The utility model discloses a characteristics and beneficial effect:
the utility model discloses integrated sludge drying and semi-dry desulfurization, sludge incineration and dry desulfurization, flue gas rapid cooling avoid dioxin resynthesis, tail gas cyclone dust removal, sack dust removal, activated carbon adsorption, ozone deodorization, wet flue gas desulfurization to equal integratively, sludge drying and semi-dry desulfurization are in coordination, need not extra semi-dry desulfurization equipment, and the direct mummification of sludge has the thermal efficiency height, and flue gas purification treatment is effectual, can realize advantages such as ultralow emission.
Drawings
FIG. 1 is a schematic structural diagram of a device for sludge spray drying incineration and desulfurization in cooperation according to the present embodiment.
Detailed Description
The technical solution of the present invention will be further described in detail through the following embodiments and the accompanying drawings.
As shown in fig. 1, the apparatus for sludge spray drying incineration and collaborative desulfurization in this embodiment includes a sludge storage pretreatment unit, a sludge spray drying collaborative semi-dry desulfurization unit, a sludge incineration collaborative dry desulfurization unit, a flue gas purification system, a slag discharge unit, and the like. Wherein the content of the first and second substances,
i, sludge storage pretreatment unit: the sludge treatment device comprises a first sludge storage tank 1, a plunger pump 2, a sludge filter 3, a sludge mixing machine 5, a second sludge storage tank 6 and a lime storage bin 4 connected with the sludge mixing machine 5 which are sequentially connected.
The sludge filter 3 is used for removing impurities such as sand with larger particle size in the wet sludge so as to reduce the abrasion of a stator and a rotor of the follow-up sludge screw pump 7 and the sludge atomizing nozzle 9. Wet sludge and slaked lime quantitatively given from a lime storage bin 4 are mixed according to the calcium-sulfur ratio of 1.2-1.5: 1, the mixture is fully and uniformly mixed by a sludge conditioner 5, then the mixture enters a second sludge storage tank 6, the mixture is sent into a sludge atomizing nozzle 9 at the middle upper part of a subsequent spray drying tower 10 from the second sludge storage tank 6 by a screw pump 7 for atomization, the mixture is dried by contacting with high-temperature flue gas, the flue gas and the wet sludge are directly contacted, and the direct drying is realized, and the heat efficiency is high.
II, sludge spray drying incineration synergistic desulfurization unit: the device comprises an air compressor 8, a spray drying tower 10, a cyclone dust collector 12, a chain conveyor 13, a rotary kiln 14, a secondary combustion chamber 16 and an air distribution system 11 which are sequentially connected with a discharge hole of the chain conveyor 13, and a primary combustor 15 and a secondary combustor 17 which are respectively connected with the rotary kiln 14 and the secondary combustion chamber 16; a sludge atomization nozzle 9 is arranged at the upper middle part in the spray drying tower 10, and is connected with a sludge outlet of the second sludge storage tank 6 through a screw pump 7 and is connected with an air compressor 8; the top, the bottom and the lower part of the spray drying tower 10 are respectively provided with a flue gas inlet connected with an air outlet of the air distribution system 11, a dry sludge discharge port connected with a feed inlet of the chain conveyor 13 and a tail gas outlet connected with a feed inlet of the cyclone dust collector 12, and the cyclone dust collector 12 is provided with an air outlet and a dry sludge outlet connected with a feed inlet of the chain conveyor 13. Wherein the content of the first and second substances,
wet sludge containing lime in a second sludge storage tank 6 is sent into a sludge atomizing spray head 9 at the middle upper part of a spray drying tower 10 through a screw pump 7, meanwhile, compressed air is sent into the sludge atomizing spray head 9 through an air compressor 8 to realize atomization, wet sludge liquid drops of 300-500 microns are formed and sprayed upwards to be in countercurrent contact with high-temperature flue gas flowing downwards from the top of the tower, finally, the wet sludge liquid drops are settled to the bottom of the spray drying tower 10 due to the gravity of gas carrying and dry sludge particles, the wet sludge liquid drops are discharged from a tail gas outlet at the lower part of the tower and a dry sludge discharge port at the bottom of the tower respectively, the discharged tail gas is introduced into a cyclone dust collector 12 to collect dry sludge in the tail gas, the discharge port at the bottom of the cyclone dust collector 12 is connected with a feed port of a chain conveyor 13, the dry sludge discharged from the bottom of the tower. After the water in the sludge liquid drops contacts with the high-temperature flue gas, the water is quickly evaporated and dried, the water content of dried sludge particles is 20% -30%, lime in the sludge liquid drops contacts with the high-temperature flue gas, acid gases such as sulfur dioxide in the flue gas react with the lime to generate calcium sulfate and the like, and the atomization effect of wet sludge containing the lime is good, so that the desulfurization reaction is sufficient, and the synergistic semidry desulfurization is realized while the sludge is dried.
And then, the dried sludge conveyed by the discharge port of the chain conveyor 13 is conveyed into the rotary kiln 14 through the kiln head of the rotary kiln 14 to be incinerated, the part with insufficient heat of the incinerated sludge in the rotary kiln 14 is supplemented by a primary combustor 15, a secondary combustor 17 maintains the temperature of a secondary combustion chamber 16 to be more than or equal to 850 ℃, the incineration of dioxin-like substances is ensured, and meanwhile, the retention time of flue gas in the secondary combustion chamber 16 is more than 2 seconds. High-temperature flue gas at the outlet of the secondary combustion chamber 16 enters air through a flue and is mixed into partial air through an air distribution system 11, so that the temperature is adjusted (the temperature is controlled to be 550-580 ℃) and then enters an air inlet at the top of a spray drying tower 9, the high-temperature flue gas (550-580 ℃) of the spray drying tower 10 is contacted with wet sludge, the temperature is reduced to be below 200 ℃ within 0.3-1 second and is reduced to be 110-130 ℃ to the lower part of the tower, so that the rapid cooling of the flue gas is realized, and the secondary synthesis of dioxin (the secondary synthesis temperature interval is 250-550 ℃) is avoided; besides, the air temperature regulation function added by the air distribution system 11 has the following two functions: firstly, when the sludge with high salt concentration is dried, if the temperature of the flue gas is too high and is higher than the melting point of partial inorganic matters, the molten inorganic matters are cooled and then adhered to the tower wall of the drying tower; secondly, the moisture carrying capacity of the flue gas in unit volume is limited by the saturated moisture content of the gas, and partial air is added to improve the moisture carrying capacity of the flue gas. The fuel used for the primary burner 15 and the secondary burner 17 may be diesel or natural gas, etc. As lime and wet sludge are mixed according to the calcium-sulfur ratio of 1.2-1.5, most of the lime reacts with the lime through the reaction of acid gas in the spray drying tower 10 to generate calcium sulfate, and a small amount of the remaining lime still remains in dry sludge particles and enters the rotary kiln 14 together for incineration, because the rotary kiln 14 is provided with a lifting plate (not shown in the figure), dry sludge powder and the remaining lime powder pass through the lifting plate along with the rotation of the rotary kiln 14 and are lifted in the space of a kiln body, and the lime is fully contacted with flue gas generated by incineration to carry out in-furnace desulfurization, thereby realizing the synergy of sludge incineration and in-furnace dry desulfurization.
III-flue gas purification unit: comprises a bag-type dust collector 19, a draught fan 21, a wet desulphurization tower 22 and a chimney 23 which are connected in sequence; the air inlet of the bag-type dust collector 19 is connected with the air outlet of the cyclone dust collector 12, harmful gases in the flue gas discharged from the cyclone dust collector 12 are removed by the flue gas purification unit, and the obtained purified flue gas is discharged into the atmosphere through a chimney 23. An activated carbon injection fan 25 connected with a powdered activated carbon storage tank 24 is arranged at the connecting pipeline of the cyclone dust collector 12 and the bag-type dust collector 19 and is used for introducing activated carbon and adsorbing harmful gases such as dioxin in flue gas; an ozone generator 20 is arranged at the connecting pipeline of the bag-type dust collector 19 and the induced draft fan 21, and odor substances in the smoke are removed through ozone oxidation; the wet desulfurization tower 22 further reduces the concentration of sulfur dioxide in the flue gas, achieving ultra-low emission of sulfur dioxide.
IV-slag tapping unit: the incineration ash is discharged from the lower end of the tail part of the rotary kiln 14, cooled and pneumatically conveyed to an ash tank 18.
The working process of the device is as follows:
when the device operates, the sludge flow of the embodiment is that wet sludge with the water content of 78-83% in a first sludge storage tank 1 is conveyed by a plunger pump 2, enters a sludge filter 3 (the filter aperture is smaller than 20mm), large-particle impurities in the wet sludge are removed, and then enters a sludge conditioner 5, meanwhile, slaked lime powder in a lime storage bin 4 quantitatively enters the sludge conditioner 5, the wet sludge and the slaked lime powder are uniformly mixed in the sludge conditioner, and then enter a second sludge storage tank 6, and then enter a sludge atomizing nozzle 9 of a spray drying tower 10 through a screw pump 7, compressed air provided by an air compressor 8 is atomized in the sludge atomizing nozzle 9, atomized wet sludge liquid drops are in countercurrent contact with high-temperature flue gas in the spray drying tower 10, and dried sludge particles with the particle size of 300-500 μm (the water content is 20-30%) are obtained. In the process that slaked lime contained in atomized sludge liquid drops contacts with high-temperature flue gas, the slaked lime reacts with acid gases such as sulfur dioxide and hydrogen chloride in the flue gas, and the removal of the acid gases such as sulfur dioxide is realized. The dried sludge is discharged to a chain conveyor 13 from the bottom of the spray drying tower 10, and part of dry sludge particles remaining in the flue gas are separated by a cyclone dust collector 12 and then discharged to the chain conveyor 13. The chain conveyor 13 conveys the dry sludge particles to the rotary kiln for incineration 14, resulting in incineration ash, which is conveyed to an ash tank 18.
In the embodiment, the high-temperature gas flow for sludge drying and the flue gas flow for sludge incineration are that the primary combustor 15 (at 900-950 ℃) provides high-temperature flue gas for the rotary kiln 14 to further dry sludge. Flue gas (the incineration temperature is 800-850 ℃) generated by sludge incineration in the rotary kiln 14 enters a secondary combustion chamber 16 (the temperature is more than or equal to 850 ℃, the retention time is more than 2 seconds), the temperature of the flue gas in the secondary combustion chamber 16 is maintained by high-temperature flue gas generated by a secondary combustor 17 (the temperature is 900-950 ℃), the flue gas at the outlet of the secondary combustion chamber 16 enters an air distribution system 11, the temperature of the mixed gas is 550-580 ℃ after the mixed gas is mixed with normal-temperature air, the mixed gas enters a spray drying tower 10 for sludge drying, the temperature of the mixed gas is reduced after the mixed gas is contacted with wet sludge, and tail gas (the temperature is 110-130 ℃) at the tail gas outlet of the spray drying tower 10 sequentially passes through a cyclone dust collector 12, a bag dust collector 19, an induced. Activated carbon powder is sprayed in front of the bag-type dust remover 19, and ozone is added into tail gas after bag-type dust removal.
The utility model discloses an each single-piece equipment all is the product sold in the market.
The device for sludge spray drying incineration and synergistic desulfurization provided by the utility model is introduced in detail, and the principle and the implementation mode of the utility model are explained by applying specific examples, and the explanation of the above examples is only used for helping to understand the core idea of the utility model; meanwhile, for a person skilled in the art, there are changes to the specific embodiments and applications according to the idea of the present invention, and these changes should be included in the protection scope of the appended claims. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (4)
1. The utility model provides a device of desulfurization is in coordination burnt in sludge spray mummification, its characterized in that includes:
the sludge storage and pretreatment unit comprises a first sludge storage tank (1), a plunger pump (2), a sludge filter (3), a sludge mixing machine (5), a second sludge storage tank (6) and a lime storage bin (4) connected with the sludge mixing machine (5), wherein the first sludge storage tank, the plunger pump (2), the sludge filter (3), the sludge mixing machine and the second sludge storage tank are sequentially connected;
the sludge spray drying incineration collaborative desulfurization unit comprises an air compressor (8), a spray drying tower (10), a cyclone dust collector (12), a chain conveyor (13), a rotary kiln (14), a secondary combustion chamber (16) and an air distribution system (11) which are sequentially connected with a discharge hole of the chain conveyor (13), and a primary combustor (15) and a secondary combustor (17) which are respectively connected with the rotary kiln (14) and the secondary combustion chamber (16); a sludge atomization nozzle (9) is arranged at the top in the spray drying tower (10), and is connected with a sludge outlet of the second sludge storage tank (6) through a screw pump (7) and connected with the air compressor (8); the spray drying tower (10) is provided with a flue gas inlet connected with an air distribution system (11) air outlet, a dry sludge discharge port connected with a chain conveyor (13) feed inlet and a tail gas outlet connected with a cyclone dust collector (12) feed inlet at the top, the bottom and the lower part respectively, and the cyclone dust collector (12) is provided with an air outlet and a dry sludge outlet connected with the chain conveyor (13) feed inlet;
the flue gas purification unit comprises a bag-type dust remover (19), an induced draft fan (21), a wet desulphurization tower (22) and a chimney (23) which are connected in sequence; the air inlet of the bag-type dust collector (19) is connected with the air outlet of the cyclone dust collector (12);
and the ash slag tank (18) is connected with the slag discharge port of the rotary kiln (14).
2. A device according to claim 1, characterized in that a material lifting plate is arranged in the rotary kiln (14).
3. The device according to claim 1 or 2, characterized in that an activated carbon injection fan (25) connected to a powdered activated carbon storage tank (24) is provided between the cyclone (12) and the bag-type dust collector (19).
4. The device according to claim 1 or 2, characterized in that an ozone generator (20) is arranged between the bag-type dust collector (19) and the induced draft fan (21).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112762461A (en) * | 2020-12-30 | 2021-05-07 | 上海市政工程设计研究总院（集团）有限公司 | Sludge incineration equipment |
| CN112811781A (en) * | 2021-01-18 | 2021-05-18 | 国投信开水环境投资有限公司 | Sludge treatment system and method with combination of spray drying and pulverized coal furnace |
| CN113144877A (en) * | 2021-04-08 | 2021-07-23 | 江门市同力环保科技有限公司 | Semi-dry desulfurization and dust removal method for waste gas of sludge sintered ceramic ceramsite |
-
2019
- 2019-10-24 CN CN201921801513.7U patent/CN211146501U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112762461A (en) * | 2020-12-30 | 2021-05-07 | 上海市政工程设计研究总院（集团）有限公司 | Sludge incineration equipment |
| CN112811781A (en) * | 2021-01-18 | 2021-05-18 | 国投信开水环境投资有限公司 | Sludge treatment system and method with combination of spray drying and pulverized coal furnace |
| CN113144877A (en) * | 2021-04-08 | 2021-07-23 | 江门市同力环保科技有限公司 | Semi-dry desulfurization and dust removal method for waste gas of sludge sintered ceramic ceramsite |
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