CN218672190U - Sludge spray drying incineration treatment system - Google Patents

Abstract

The utility model belongs to the technical field of sludge treatment deals with, a sludge spray mummification incineration disposal system is related to, including burning the device, air heater, the drying tower, the flue gas purification unit, tail gas processing unit and wet sludge storage tank, air heater establishes between burning device and drying tower, be equipped with the flue gas passageway and the air duct of indirect heat transfer among the air heater, the exhanst gas outlet who burns the device is connected to the one end of flue gas passageway, the flue gas purification unit is connected to the other end, the air-blower is connected to air duct's one end, the air inlet of drying tower is connected to the other end, still be equipped with the mud jet that links to each other with wet sludge storage tank on the drying tower, the gas outlet that links to each other with tail gas processing unit and the discharge gate that links to each other with the feed inlet that burns the device. The utility model discloses can guarantee that the flue gas temperature who gets into flue gas purification system maintains above the acid dew point, prevents the low temperature corrosion to the high temperature flue gas that the sludge incineration produced does not with mud direct contact, the risk that CO, VOCs exceeded standard emission in avoiding the flue gas.

Description

Sludge spray drying incineration treatment system

Technical Field

The utility model belongs to the technical field of sludge treatment deals with, a sludge spray mummification incineration disposal system is related to.

Background

Sludge incineration is the most direct and effective reduction sludge disposal mode and is divided into independent incineration and synergistic mixed incineration. According to relevant requirements, the water content of the treated sludge of the sewage treatment plant is generally controlled to be about 80%, and the heat value is very low and is generally a negative value. Therefore, when in incineration, the sludge needs to be dried firstly, and the incineration can be ensured to be carried out smoothly only by increasing the heat value to a certain degree. The existing drying incineration process is mainly divided into two types: indirect drying, fluidized bed incineration, direct drying and rotary kiln incineration. The direct drying includes spray drying, drying in a kiln, and the like. The spray drying technology is applied to the industries of food, medicine, chemical industry and the like at the earliest time, is applied to sludge drying at present, and has the advantages of high drying efficiency, simple production process, less environmental pollution and the like.

Chinese patent with publication number CN200710070060 discloses a sludge drying and incinerating treatment method and an integrated device. The process route is as follows: the wet sludge enters a spray drying tower after being pretreated,spray drying is carried out by using high-temperature flue gas generated by burning in a rotary kiln, the dried sludge is sent into the rotary kiln to be burned, and slag generated by burning is sent into a slag storage tank through a fan; and a tail gas outlet of the spray drying tower is sequentially connected with the dust remover, the fan, the tail gas treatment device, the dehumidification tower and the chimney. The existing sludge drying and incinerating system mainly has the following defects: 1) The spray drying tower is directly connected with the rotary kiln, and mutual interference causes poor operation stability of the whole system, such as increase of moisture content of wet sludge, insufficient drying heat, increase of moisture content of dry sludge, reduction of heat value of sludge entering a furnace, and reduction of burning temperature of the rotary kiln; 2) The sludge is a heat-sensitive substance, the high-temperature flue gas entering a spray drying tower needs to be controlled not to exceed 600 ℃, the high-temperature flue gas generated by burning the rotary kiln is not lower than 850 ℃, and a large amount of ambient cold air needs to be supplemented before entering the spray drying tower, so that the flue gas amount is greatly increased, and the load of subsequent flue gas purification equipment and the heat loss of exhaust smoke are increased; 3) High-temperature flue gas directly contacts with sludge, a small amount of VOCs is separated out in the sludge drying process, the VOCs are treated by an ozone oxidation device in the prior art to be discharged up to the standard, the equipment investment and the operation cost are increased, meanwhile, the risk of ozone pollution exists, and secondly, if the heat in a spray drying tower exceeds the heat absorption capacity of wet sludge due to special conditions, such as blockage of a sludge nozzle, the dried sludge is heated to be incompletely oxidized to generate CO, and a subsequent flue gas purification system has no capacity of treating CO, so that the risk of excessive discharge of CO exists; 4) The flue gas generated by sludge incineration contains a large amount of SO _x And the moisture content in the flue gas is greatly improved after spray drying, and the temperature of the flue gas at the outlet of the drying tower is 70-80 ℃ which is far lower than the acid dew point of the flue gas, so that the subsequent flue gas purification equipment is seriously corroded at low temperature.

Therefore, a new sludge drying and incinerating system is urgently needed to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the utility model is to provide a sludge spray mummification incineration disposal system, through setting up the air heater between incineration device and the drying tower, divide sludge spray mummification and sludge incineration into two independent and mutual synergistic systems, utilize the high temperature flue gas that sludge incineration produced and the indirect heat transfer of air obtain high temperature air in air heater, carry out sludge spray mummification, then send into the rotary kiln behind the sludge mummification and burn, form synergistic closed loop each other, and the flue gas after the air heater heat transfer then sends into flue gas purification system and handles the back and discharge, flue gas temperature accessible control heat transfer volume is adjusted, thereby ensured that the flue gas temperature who gets into flue gas purification system maintains above the acid dew point, and the high temperature flue gas that sludge incineration produced does not with mud direct contact, CO has been avoided, the risk that VOCs exceeds standard and discharges.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a sludge spray mummification incineration disposal system, is including burning device, air heater, drying tower, gas cleaning unit, tail gas processing unit and wet sludge storage tank, and air heater establishes between burning device and drying tower, be equipped with indirect heat transfer's flue gas passageway and air duct among the air heater, the exhanst gas outlet who burns the device is connected to the one end of flue gas passageway, and the other end is connected the gas cleaning unit, the air-blower is connected to air duct's one end, and the air inlet of drying tower is connected to the other end, still be equipped with the mud jet that links to each other with wet sludge storage tank on the drying tower, the gas outlet that links to each other with tail gas processing unit and the discharge gate that links to each other with the feed inlet that burns the device.

Further, in the drying tower, a discharge hole is formed in the bottom of the drying tower, an air outlet is formed in the lower portion of the drying tower, a sludge injection hole is formed in the upper portion of the drying tower, and an air inlet is formed in the top of the drying tower.

Further, an air heater is arranged between the air preheater and the drying tower.

Further, the flue gas purification unit includes dry desulfurization device, dust collector, draught fan, wet deacidification device and the chimney that arranges in proper order along the flue gas flow direction.

Furthermore, the ash outlets of the dust removal device and the dry desulphurization device are both connected with an ash flying bin.

Further, the dry desulfurization device is a tower-type dry desulfurizer or a flue-type dry desulfurizer, the dust removal device is a first bag-type dust remover, and the wet deacidification device is an alkali liquor spray tower.

Further, the tail gas treatment unit comprises a material collecting device and a condenser, wherein the air inlet of the material collecting device is connected with the air outlet of the drying tower, and the air outlet of the material collecting device is connected with the air inlet of the condenser.

Furthermore, the air outlet of the condenser is divided into three paths, the first path is connected with the air channel of the air preheater, the second path is connected with the air inlet of the incineration device, and the third path is connected with the external deodorization equipment.

Further, the material collecting device is a second bag-type dust collector, and an ash outlet of the second bag-type dust collector is connected with a feed inlet of the incineration device.

Furthermore, the burning device comprises a rotary kiln burning furnace and a secondary combustion chamber, an air outlet of the rotary kiln burning furnace is connected with an air inlet of the secondary combustion chamber, an air outlet of the secondary combustion chamber is a flue gas outlet of the burning device, and a feeding hole of the rotary kiln burning furnace is a feeding hole of the burning device.

The beneficial effects of the utility model reside in that:

1. the utility model discloses a set up the air heater between burning device and drying tower, burn sludge spray mummification and sludge and divide into two independent and mutual synergistic systems, utilize the high temperature flue gas that sludge incineration produced and the indirect heat transfer of air obtain high temperature air in air heater, carry out sludge spray mummification, then burn in sending into the rotary kiln behind the sludge mummification, form synergistic closed loop each other, and the flue gas after the air heater heat transfer then sends into the gas cleaning system and handles the back and discharge, flue gas temperature accessible control heat transfer volume is adjusted, thereby ensured the flue gas temperature who gets into gas cleaning system and maintain above the acid dew point, low temperature corrosion has been avoided, extension gas cleaning equipment life, and the high temperature flue gas that sludge incineration produced does not with mud direct contact, CO has been avoided, the risk that VOCs exceeds standard and discharges.

2. The utility model discloses well two subsystems of sludge spray mummification and sludge incineration are relatively independent, flue gas temperature among the flue gas purification unit accessible air heater regulation entering flue gas purification unit, simultaneously can carry out independent the regulation to the temperature that is used for the mummification of sludge spray's high-temperature air through air heater cooperation air heater, thereby entire system's steady operation has been guaranteed, and entire system carries out high temperature flue gas waste heat recovery owing to the mode that adopts indirect heat transfer, thereby avoided sneaking into a large amount of cold wind for satisfying spray mummification temperature requirement and reducing flue gas temperature, the flue gas volume that gets into the flue gas purification unit has been reduced, calculate according to the balance, the utility model provides a flue gas volume that the sludge incineration system need purify only has 40% of prior art technology, has reduced flue gas purification equipment investment and operation load.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and/or combinations particularly pointed out in the appended claims.

Drawings

For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic structural diagram of a sludge spray drying incineration treatment system in an embodiment.

Reference numerals: the system comprises a rotary kiln incinerator 1, a secondary combustion chamber 2, a sludge feeding device 3, a combustor 4, a denitration device 5, a slag extractor 6, a slag bin 7, an air preheater 8, a dry desulfurization device 9, a dust removal device 10, an induced draft fan 11, a fly ash bin 12, a wet deacidification device 13, a chimney 14, an air blower 15, an air heater 16, a drying tower 17, a material collecting device 18, a condenser 19, a wet sludge storage tank 20 and a screw pump 21.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "back", etc., indicating directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limiting the present invention, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

Please refer to fig. 1, which is a sludge spray drying incineration treatment system, comprising an incineration device, an air preheater 8, a drying tower 17, a flue gas purification unit, a tail gas treatment unit and a wet sludge storage tank 20, wherein the air preheater 8 is arranged between the incineration device and the drying tower 17, a flue gas channel and an air channel for indirect heat exchange are arranged in the air preheater 8, one end of the flue gas channel is connected with a flue gas outlet of the incineration device, the other end of the flue gas channel is connected with the flue gas purification unit, one end of the air channel is connected with an air blower 15, the other end of the air channel is connected with an air inlet of the drying tower 17, and the drying tower 17 is further provided with a sludge jet orifice connected with the wet sludge storage tank 20, an air outlet connected with the tail gas treatment unit and a discharge port connected with a feed inlet of the incineration device.

The incinerator comprises a rotary kiln incinerator 1 and a secondary combustion chamber 2, wherein an air outlet of the rotary kiln incinerator 1 is connected with an air inlet of the secondary combustion chamber 2, an air outlet of the secondary combustion chamber 2 is a smoke outlet of the incinerator, a feed inlet of the rotary kiln incinerator 1 is a feed inlet of the incinerator, an air inlet of the incinerator is composed of a primary air inlet and a secondary air inlet, the primary air inlet is formed in one end, close to the feed inlet of the rotary kiln incinerator 1, the secondary air inlet is formed in the lower portion of the secondary combustion chamber 2, a slag discharging port is formed in the tail portion of the rotary kiln incinerator 1 and the bottom of the secondary combustion chamber 2 and is connected with a slag discharging machine 6, and the slag discharging machine 6 is connected with a slag bin 7, so that slag formed after complete combustion in the incinerator is fed into the slag bin 7.

In this embodiment, air heater 8 with still be equipped with air heater 16 between the drying tower 17, the flue gas purification unit includes dry process desulphurization unit 9, dust collector 10, draught fan 11, wet process deacidification device 13 and chimney 14 that follow the flue gas flow direction and arrange in proper order, dry process desulphurization unit 9 is tower or flue formula dry process desulfurizer, and dust collector 10 is first sack cleaner, and wet process deacidification device 13 is the alkali lye spray column, and fly ash storehouse 12 is all connected to dust collector 10 and dry process desulphurization unit 9's ash outlet, and fly ash in the fly ash storehouse 12 is handled as the danger waste.

In this embodiment, the tail gas processing unit includes a material collecting device 18 and a condenser 19, an air inlet of the material collecting device 18 is connected to an air outlet of the drying tower 17, an air outlet of the material collecting device 18 is connected to an air inlet of the condenser 19, an air outlet of the condenser 19 is divided into three paths, the first path is connected to an air channel of the air preheater 8, the second path is connected to an air inlet of the incineration device, and the third path is connected to an external deodorization device; the second path of the air outlet of the condenser 19 is connected with the primary air inlet and the secondary air inlet respectively.

Specifically, in the drying tower 17, the discharge port is arranged at the bottom of the drying tower 17, the air outlet is arranged at the lower part of the drying tower 17, the sludge injection port is arranged at the upper part of the drying tower 17, and the air inlet is arranged at the top of the drying tower 17; the rotary kiln burns burning furnace 1 and goes up the one end that is close to the air inlet and the middle part of second combustion chamber 2 all is equipped with combustor 4 to be equipped with denitration nozzle (SNCR or PNCR) in the upper portion of second combustion chamber 2 and carry out the flue gas denitration, and rotary kiln burns burning furnace 1's feed inlet department and is equipped with sludge feeding device 3, sludge feeding device 3 comprises feeder hopper and screw conveyer, and the feeder hopper is as doing mud storage container, and the lateral wall sets up the rapping apparatus, prevents to appear bridging phenomenon, and lower joint screw conveyer carries mud to incineration device, guarantees stable feed, maintains the normal operating of system of burning.

In this embodiment, the sludge spray drying incineration treatment system is divided into a drying system and an incineration system, and the two systems are relatively independent and cooperate with each other to share one air preheater 8.

The drying system comprises a wet sludge storage tank 20, a screw pump 21, a blower 15, an air preheater 8, an air heater 16, a drying tower 17, a second bag-type dust remover and a condenser 19; the operation flow of the drying system is as follows: the sludge in the wet sludge storage tank 20 is conveyed to the drying tower 17 by a screw pump 21 and atomized under the action of compressed air; the drying air is sent into an air preheater 8 by a blower 15 to indirectly exchange heat with high-temperature flue gas generated by incineration, and then the air temperature is further regulated by an air heater 16 (an electric heating or fuel burner) (not more than 600 ℃) and then the drying air is sent into a drying tower 17 to dry wet sludge; most of the dried sludge is collected from the bottom of the drying tower 17, and a small part of the dried sludge brought out by the tail gas of the drying tower 17 is collected by a second bag-type dust remover, discharged from a discharge port of the second bag-type dust remover and uniformly sent to an incineration device; the tail gas of the drying tower 17 absorbing moisture of the wet sludge is dedusted by the second bag-type dust remover and cooled and dehydrated by the condenser 19 to be divided into three paths, the first path is sent into the incineration device to be used as primary air and secondary air for incinerating the sludge, the second path is mixed with fresh air in the air blower 15 and then sent to an air channel in the air preheater 8 for heat exchange, the third path is connected with external deodorization equipment to be used as an emergency standby branch, and the three paths are provided with shut-off valves so as to control the on-off of the pipelines.

The incineration system comprises a sludge feeding device 3, a rotary kiln incinerator 1, a secondary combustion chamber 2, a denitration device 5, a combustor 4, a slag extractor 6, an air preheater 8, a dry desulfurization device 9, a first bag-type dust remover, an induced draft fan 11, an alkali liquor spray tower and a chimney 14.

Operation of an incineration system: the dried sludge is stably sent into a rotary kiln for incineration (the combustion temperature is 850 ℃) by a sludge feeding device 3; the sludge incineration tail gas enters a secondary combustion chamber 2 for secondary combustion, the combustion temperature is maintained to be more than or equal to 850 ℃, the retention time of the flue gas in the secondary combustion chamber 2 is ensured to be more than or equal to 2s, the thorough incineration of dioxin is ensured, and meanwhile, a denitration nozzle (SNCR or PNCR) is arranged in the upper area of the secondary combustion chamber 2 for flue gas denitration; the incinerated ash is discharged from the tail part of the rotary kiln incinerator 1 and a slag discharge port at the bottom of the secondary combustion chamber 2 and is sent to a slag bin 7 through a slag discharging machine 6 for storage; flue gas discharged from the secondary combustion chamber 2 enters an air preheater 8 to exchange heat with air used for a drying tower 17 (the temperature of outlet flue gas is more than or equal to 150 ℃, and the acid dew point of the flue gas is higher than that of the flue gas), the flue gas is sent into a flue gas purification unit, the flue gas is deacidified by slaked lime by a dry desulphurization device, the flue gas is dedusted by activated carbon introduced into a flue gas pipeline by a first bag-type dust remover in a matching manner, and is discharged from a chimney 14 after being dedusted and demisted by the activated carbon introduced into an alkali liquor spray tower, wherein an induced draft fan 11 is used as a power source for flowing of the flue gas.

In the embodiment, the air preheater 8 arranged between the incineration device and the drying tower 17 divides sludge spray drying and sludge incineration into two independent and synergistic systems, high-temperature air obtained by indirectly exchanging heat between high-temperature flue gas generated by sludge incineration and air in the air preheater 8 is utilized for sludge spray drying, the sludge is dried and then sent into the rotary kiln for incineration to form a synergistic closed loop, the flue gas after heat exchange by the air preheater 8 is sent into the flue gas purification system for treatment and then is discharged, and the temperature of the flue gas entering the flue gas purification system can be effectively maintained above an acid dew point by adjusting the heat exchange amount of the air preheater 8; high-temperature flue gas generated by sludge incineration does not directly contact with sludge, so that the risk of over-standard emission of CO and VOCs is avoided; the high-temperature flue gas waste heat recovery is carried out by adopting an indirect heat exchange mode, so that the problem that a large amount of cold air is mixed to reduce the temperature of the flue gas for meeting the requirement of spray drying temperature is avoided, the amount of the flue gas entering the flue gas purification unit is reduced, according to balance calculation, the amount of the flue gas to be purified by the sludge incineration system in the embodiment is only 40% of that of the flue gas in the prior art, and the investment and the operation load of flue gas purification equipment are reduced.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (10)

1. The utility model provides a sludge spray drying incineration disposal system which characterized in that: including incineration device, air heater (8), drying tower (17), gas cleaning unit, tail gas processing unit and wet sludge storage tank (20), establish between incineration device and drying tower (17) air heater (8), be equipped with indirect heat transfer's flue gas passageway and air duct in air heater (8), the exhanst gas outlet of incineration device is connected to the one end of flue gas passageway, and the other end is connected the gas cleaning unit, air-blower (15) are connected to air duct's one end, and the air inlet of drying tower (17) is connected to the other end, still be equipped with the sludge jet who links to each other with wet sludge storage tank (20), the gas outlet that links to each other with tail gas processing unit and the discharge gate that links to each other with incineration device's feed inlet on drying tower (17).

2. The sludge spray drying incineration treatment system according to claim 1, characterized in that: in the drying tower (17), a discharge hole is formed in the bottom of the drying tower (17), an air outlet is formed in the lower portion of the drying tower (17), a sludge jet orifice is formed in the upper portion of the drying tower (17), and an air inlet is formed in the top of the drying tower (17).

3. The sludge spray drying incineration treatment system according to claim 1, characterized in that: an air heater (16) is also arranged between the air preheater (8) and the drying tower (17).

4. The sludge spray drying incineration treatment system according to claim 1, characterized in that: the flue gas purification unit comprises a dry desulfurization device (9), a dust removal device (10), an induced draft fan (11), a wet deacidification device (13) and a chimney (14) which are sequentially arranged along the flow direction of flue gas.

5. The sludge spray drying incineration disposal system of claim 4, wherein: and ash outlets of the dust removal device (10) and the dry desulfurization device (9) are connected with an ash flying bin (12).

6. The sludge spray drying incineration disposal system of claim 4, wherein: the dry desulfurization device (9) is a tower-type dry desulfurizer or a flue-type dry desulfurizer, the dust removal device (10) is a first bag-type dust remover, and the wet deacidification device (13) is an alkali liquor spray tower.

7. The sludge spray drying incineration treatment system according to claim 1, characterized in that: the tail gas treatment unit comprises a material collecting device (18) and a condenser (19), wherein the gas inlet of the material collecting device (18) is connected with the gas outlet of the drying tower (17), and the gas outlet of the material collecting device (18) is connected with the gas inlet of the condenser (19).

8. The sludge spray drying incineration disposal system of claim 7, wherein: the air outlet of the condenser (19) is divided into three paths, the first path is connected with the air channel of the air preheater (8), the second path is connected with the air inlet of the incineration device, and the third path is connected with external deodorization equipment.

9. The sludge spray drying incineration treatment system according to claim 7, characterized in that: the material collecting device (18) is a second bag-type dust remover, and an ash outlet of the second bag-type dust remover is connected with a feed inlet of the incineration device.

10. The sludge spray drying incineration treatment system according to claim 1, characterized in that: the incinerator comprises a rotary kiln incinerator body (1) and a secondary combustion chamber (2), wherein an air outlet of the rotary kiln incinerator body (1) is connected with an air inlet of the secondary combustion chamber (2), an air outlet of the secondary combustion chamber (2) is a smoke outlet of the incinerator, and a feed inlet of the rotary kiln incinerator body (1) is a feed inlet of the incinerator.

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