阅读说明：本技术 一种利用高温烟气处置污泥的装置及方法 (Device and method for treating sludge by using high-temperature flue gas ) 是由 吴庆龙 房凡 汪华剑 陈煜� 王洋 马翔 于 2021-09-03 设计创作，主要内容包括：本发明涉及污泥处理及处置技术领域,为一种利用高温烟气处置污泥的装置及方法。包括与锅炉连接的污泥干化设备；污泥干化设备的顶部设置有物料入口,底部通过物料出口依次连接风扇磨、炉烟风机和锅炉的污泥燃烧器,内部自上而下依次设有链条传送带和旋翼；所述链条传送带上方的污泥干化设备侧壁上设置有烟气入口；烟气入口沿链条传送带传输方向设置,所述的烟气入口与锅炉低温过热器出口烟道处的高温取烟口和省煤器入口烟道的中温取烟口连接；链条传送带包括一级链条传送带和二级链条传送带；一级链条传送带设置在二级链条传送带上方；一级链条传送带与二级链条传送带的输送方向相反,且一级链条传送带与二级链条传送带交错设置。(The invention relates to the technical field of sludge treatment and disposal, in particular to a device and a method for disposing sludge by using high-temperature flue gas. Comprises a sludge drying device connected with a boiler; the top of the sludge drying equipment is provided with a material inlet, the bottom of the sludge drying equipment is sequentially connected with a fan mill, a furnace fume fan and a sludge burner of a boiler through a material outlet, and a chain conveyor belt and a rotor wing are sequentially arranged in the sludge drying equipment from top to bottom; a flue gas inlet is formed in the side wall of the sludge drying equipment above the chain conveyor belt; the flue gas inlet is arranged along the transmission direction of the chain conveyor belt, and is connected with a high-temperature smoke taking port at the outlet flue of the boiler low-temperature superheater and a medium-temperature smoke taking port at the inlet flue of the economizer; the chain conveyor belt comprises a primary chain conveyor belt and a secondary chain conveyor belt; the primary chain conveyor belt is arranged above the secondary chain conveyor belt; the conveying direction of the first-level chain conveying belt is opposite to that of the second-level chain conveying belt, and the first-level chain conveying belt and the second-level chain conveying belt are arranged in a staggered mode.)

1. The device for treating sludge by using high-temperature flue gas is characterized by comprising a sludge drying device (1) connected with a boiler;

the top of the sludge drying equipment (1) is provided with a material inlet (7), the bottom of the sludge drying equipment is sequentially connected with a fan mill (2), a furnace smoke blower (3) and a sludge burner (4) of a boiler through a material outlet, and a chain conveyor belt and a rotor wing (10) are sequentially arranged in the sludge drying equipment from top to bottom; a flue gas inlet is formed in the side wall of the sludge drying equipment (1) above the chain conveyor belt; the flue gas inlet is arranged along the transmission direction of the chain conveyor belt, and is connected with a high-temperature smoke taking port (11) at the flue of a low-temperature boiler heat outlet of the boiler and a medium-temperature smoke taking port (12) at the inlet of the economizer.

2. The device for treating sludge by using high-temperature flue gas as claimed in claim 1, wherein the chain conveyor comprises a primary chain conveyor (5) and a secondary chain conveyor (6); the primary chain conveyor belt (5) is arranged above the secondary chain conveyor belt (6); the conveying direction of the first-stage chain conveying belt (5) is opposite to that of the second-stage chain conveying belt (6), and the first-stage chain conveying belt (5) and the second-stage chain conveying belt (6) are arranged in a staggered mode.

3. An apparatus for treating sludge with high temperature flue gas according to claim 2, wherein the flue gas inlet comprises a first flue gas inlet (8) and a second flue gas inlet (9); the first flue gas inlet (8) is arranged above the inner wall of the sludge drying equipment (1) corresponding to the input end of the primary chain conveyor belt (5); and the second flue gas inlet (9) is arranged above the inner wall of the sludge drying equipment (1) corresponding to the input end of the secondary chain conveyor belt (6).

4. The apparatus for treating sludge with high temperature flue gas according to claim 3, wherein the first flue gas inlet (8) is connected with the high temperature flue gas taking port (11) and the medium temperature flue gas taking port (12) of the boiler flue through pipelines.

5. The apparatus for treating sludge with high temperature flue gas according to claim 3, wherein the second flue gas inlet (9) is connected with the high temperature flue gas taking port (11) and the medium temperature flue gas taking port (12) of the boiler flue through pipelines.

6. The device for treating sludge by using high-temperature flue gas according to claim 1, wherein the rotary wing (10) is in a cylindrical shape, and a plurality of rotary rods are uniformly distributed on the rotary wing; one end of the rotor wing (10) is connected with the motor, and the other end of the rotor wing is just opposite to a material outlet of the sludge drying equipment (1).

7. The device for treating sludge by using high-temperature flue gas as claimed in claim 1, wherein the outlets of the high-temperature flue gas taking port (11) and the medium-temperature flue gas taking port (12) are provided with control valves, and the control valves are connected with the flue gas inlets through a confluence pipeline.

8. The device for treating sludge by using high-temperature flue gas as claimed in claim 6, wherein a control valve is arranged on the pipeline of the confluence pipeline connected with the flue gas inlet.

9. A method for treating sludge by using high-temperature flue gas, which is characterized by comprising the following steps based on the device of any one of the claims 1-8:

firstly, a furnace smoke fan (3) is used for taking high-temperature smoke and medium-temperature smoke from a high-temperature smoke taking port (11) and a medium-temperature smoke taking port (12) of a boiler respectively, and the two kinds of smoke are mixed and then are sent into a sludge drying device (1) through a smoke inlet; meanwhile, the sludge is sent into the sludge drying equipment (1) through a material inlet (7);

secondly, the sludge entering the sludge drying device (1) falls on the chain conveyor belt firstly, the sludge moves forwards along with the primary chain conveyor belt (5) and is dried by hot flue gas entering from a flue gas inlet, the dried sludge falls on the rotor wing (10) from the secondary chain conveyor belt (6), and is crushed by the rotor wing (10) and is thrown upwards, so that the water in the sludge is further evaporated to dryness to form small-particle dry sludge;

and finally, carrying the small-particle dry sludge into the fan mill (2) by the flue gas, crushing the small-particle dry sludge into fine powder in the fan mill (2), carrying the fine powder of the sludge into a sludge combustor (4) arranged on a boiler hearth by the flue gas, and finally finishing combustion treatment of the fine powder of the sludge in the high-temperature hearth.

10. The method for treating sludge by using high temperature flue gas as claimed in claim 9,

the sludge firstly falls on the primary chain conveyor belt (5), moves forwards along with the primary chain conveyor belt (5) and is dried by hot flue gas entering from the first flue gas inlet (8); then falls into a secondary chain conveyor belt (6) from the primary chain conveyor belt (5), and is dried by hot flue gas entering from a second flue gas inlet (9) while moving forwards along with the secondary chain conveyor belt (6); finally, the sludge falls on the rotor wing (10) from the secondary chain conveyor belt (6), and the sludge is crushed by the rotor wing (10) and is thrown upwards;

the control valves are used for respectively controlling the extraction amount of the high-temperature flue gas and the medium-temperature flue gas and adjusting the temperature of the mixed flue gas entering the flue gas inlet.

Technical Field

The invention relates to the technical field of sludge treatment and disposal, in particular to a device and a method for disposing sludge by using high-temperature flue gas.

Background

In recent years, the urbanization level of China is continuously improved, the sludge yield is greatly increased, and the annual output of municipal sludge in China reaches 6000 to 9000 ten thousand tons in 2020 by data statistics. The sludge contains harmful substances such as pathogenic microorganisms, parasites, heavy metals and the like. If the sludge is unreasonably treated, underground water, soil and the like can be polluted, and the health of human beings is seriously harmed, so the sludge treatment mode becomes the focus of industrial attention.

The existing sludge treatment and disposal technologies, such as sludge composting agriculture, landfill, sea filling, incineration and the like, are difficult to solve the sludge problem well, and can not meet the requirements of sludge disposal on reduction, harmlessness and reclamation. The existing boiler is used for blending combustion to treat sludge, so that harmless treatment of the sludge can be realized, the existing typical technical route is that a rotary drum type drier is used, steel balls are arranged in a rotary drum to realize drying and crushing of the sludge, and the crushed sludge can be sent into the boiler for combustion treatment. But the heat exchange efficiency of the rotary drum type drying machine is lower, the volume of the rotary drum is huge when a large amount of sludge is treated, the drying machine is easily damaged due to the arrangement of the steel balls in the rotary drum, and the workload of overhauling and maintaining the drying machine is larger.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a device and a method for treating sludge by using high-temperature flue gas, which have the advantages of simple structure, reasonable design, safety and reliability, and can effectively increase the effective heat exchange area and reduce the occupied area of equipment.

The invention is realized by the following technical scheme:

a device for treating sludge by using high-temperature flue gas comprises a sludge drying device connected with a boiler;

the top of the sludge drying equipment is provided with a material inlet, the bottom of the sludge drying equipment is sequentially connected with a fan mill, a flue gas blower and a sludge burner of a boiler through a material outlet, and a chain conveyor belt and a rotor wing are sequentially arranged in the sludge drying equipment from top to bottom; a flue gas inlet is formed in the side wall of the sludge drying equipment above the chain conveyor belt; the flue gas inlet is arranged along the transmission direction of the chain conveyor belt, and is connected with a high-temperature smoke taking port at the outlet flue of the boiler low-temperature superheater and a medium-temperature smoke taking port at the inlet flue of the economizer.

Further, the chain conveyor belt comprises a primary chain conveyor belt and a secondary chain conveyor belt; the primary chain conveyor belt is arranged above the secondary chain conveyor belt; the conveying direction of the primary chain conveying belt is opposite to that of the secondary chain conveying belt, and the primary chain conveying belt and the secondary chain conveying belt are arranged in a staggered mode.

Further, the flue gas inlet comprises a first flue gas inlet and a second flue gas inlet; the first flue gas inlet is arranged above the inner wall of the sludge drying equipment corresponding to the input end of the primary chain conveyor belt; and the second flue gas inlet is arranged above the inner wall of the sludge drying equipment corresponding to the input end of the secondary chain conveyor belt.

Still further, the first flue gas inlet is connected with a high-temperature flue gas taking port and a medium-temperature flue gas taking port of a boiler flue through pipelines.

And furthermore, the second flue gas inlet is connected with a high-temperature flue gas taking port and a medium-temperature flue gas taking port of a boiler flue through pipelines.

Furthermore, the rotor wing is in a cylindrical shape, and a plurality of rotary rods are uniformly distributed on the rotor wing; the motor is connected to the one end of rotor, and the other end is just to the material export of sludge drying equipment.

Furthermore, the outlets of the high-temperature smoke taking port and the medium-temperature smoke taking port are respectively provided with a control valve which is connected with the smoke inlet through a converging pipeline.

Furthermore, a control valve is arranged on a pipeline connecting the converging pipeline and the flue gas inlet.

A method for treating sludge by using high-temperature flue gas comprises the following steps:

firstly, a furnace smoke fan is used for taking high-temperature smoke and medium-temperature smoke from a high-temperature smoke taking port and a medium-temperature smoke taking port of a boiler respectively, and the two kinds of smoke are mixed and then are sent into sludge drying equipment through a smoke inlet; meanwhile, the sludge is sent into a sludge drying device through a material inlet;

secondly, the sludge entering the sludge drying device falls on the chain conveyor belt firstly, the sludge moves forwards along with the primary chain conveyor belt and is dried by hot flue gas entering from a flue gas inlet, and the dried sludge falls on the rotor wing from the secondary chain conveyor belt, is crushed by the rotor wing and is thrown upwards, so that the water in the sludge is further evaporated to dryness to form small-particle dry sludge;

and finally, carrying the small-particle dry sludge into the fan mill by the flue gas, crushing the small-particle dry sludge into fine powder in the fan mill, carrying the fine powder of the sludge into a sludge burner arranged on a boiler hearth by the flue gas, and finally finishing combustion treatment of the fine powder of the sludge in the high-temperature hearth.

Further, the sludge firstly falls on the primary chain conveyor belt and moves forwards along with the primary chain conveyor belt, and is dried by hot flue gas entering from the first flue gas inlet; then falls into a secondary chain conveyor belt from the primary chain conveyor belt, and moves forwards along with the secondary chain conveyor belt and is dried by hot flue gas entering from a second flue gas inlet; finally, the sludge falls on the rotor wing from the secondary chain conveyor belt, and is crushed by the rotor wing and is thrown upwards;

the control valves are used for respectively controlling the extraction amount of the high-temperature flue gas and the medium-temperature flue gas and adjusting the temperature of the mixed flue gas entering the flue gas inlet.

Compared with the prior art, the invention has the following beneficial technical effects:

according to the device, the chain conveyor belt is arranged in the sludge drying equipment, so that the retention time and the effective heat exchange area of the sludge in the drying equipment are increased, the sludge moisture evaporation efficiency is increased, the space utilization rate of the sludge drying equipment is increased, the occupied area of the equipment is effectively reduced, and the sludge can be prevented from being hardened and blocked in the drying process; the high-temperature and medium-temperature flue gas of the boiler is mixed through the flue gas inlet and then is sent into the sludge drying equipment to dry the sludge, so that the efficiency is high and the reliability is high; meanwhile, the rotor and the fan mill are arranged, so that the sludge is crushed in two stages, the sludge is crushed into fine powder which can be subjected to suspension combustion in the pulverized coal boiler, the sludge can be carried by flue gas and directly sent into the boiler for combustion treatment, the dry sludge transportation process is avoided, and secondary pollution is avoided.

Furthermore, the chain conveyor belt adopted by the device is a two-stage chain conveyor belt which is arranged in an up-and-down staggered manner, so that the sludge sequentially passes through the primary chain conveyor belt and the secondary chain conveyor belt, and the retention time and the effective heat exchange area of the sludge in the drying equipment can be further increased.

Furthermore, the two flue gas inlets are arranged at different positions, and the dried flue gas is sent into the sludge drying equipment in a grading manner, so that the flow of the flue gas sent into the sludge drying equipment from the first flue gas inlet can be reduced, the flow rate of the flue gas is reduced, and the heat exchange between the flue gas and sludge on the primary chain conveyor belt is more sufficient; high-temperature flue gas is supplemented at the second flue gas inlet, the flue gas temperature at the secondary chain conveyor belt is improved, and the drying effect of sludge on the secondary chain conveyor belt is enhanced.

Furthermore, the device of the invention adopts the control valves to respectively control the extraction amount of the high-temperature flue gas and the medium-temperature flue gas of the boiler, thereby controlling the temperature of the mixed flue gas; meanwhile, the amount of mixed flue gas entering the first flue gas inlet and the amount of mixed flue gas entering the second flue gas inlet can be controlled through the control valves respectively, the method is flexible and reliable, and the treatment effect can be ensured.

According to the method, high-temperature flue gas is extracted from a boiler to a sludge drying device according to the characteristic of high moisture content of sludge, a chain conveyor belt is arranged in the sludge drying device to increase the retention time and the effective heat exchange area of the sludge in the drying device, a rotor wing is arranged in the drying device to primarily crush semi-dry sludge so as to further release internal moisture of the sludge, a fan mill is arranged behind the drying device to crush the sludge into fine powder which can be combusted by the boiler, and the sludge powder is carried by the flue gas and sent back to the boiler for internal combustion treatment.

Drawings

Fig. 1 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.

In the figure: 1. the system comprises sludge drying equipment, a fan mill, a furnace smoke blower, a sludge burner, a primary chain conveyor belt, a secondary chain conveyor belt, a material inlet, a first smoke inlet, a second smoke inlet, a rotor wing, a high-temperature smoke outlet and a middle-temperature smoke outlet, wherein the fan mill is 2, the furnace smoke blower is 3, the sludge burner is 4, the primary chain conveyor belt is 5, the secondary chain conveyor belt is 6, the material inlet is 7, the first smoke inlet is 8, the second smoke inlet is 9, the rotor wing is 10, the high-temperature smoke outlet is 11, and the middle-temperature smoke outlet is 12.

Detailed Description

The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.

The invention relates to a device for treating sludge by using high-temperature flue gas, which comprises a sludge drying device 1, a fan mill 2, a furnace flue gas blower 3, a sludge burner 4, a primary chain conveyor belt 5, a secondary chain conveyor belt 6, a material inlet 7, a first flue gas inlet 8, a second flue gas inlet 9, a rotor wing 10, a high-temperature flue gas taking port 11 and a medium-temperature flue gas taking port 12, wherein the fan mill 2 is arranged at the top of the furnace flue gas blower;

the material inlet 7 is arranged at the top of the sludge drying equipment 1; a material outlet at the bottom of the sludge drying equipment 1 is sequentially connected with a fan mill 2, a furnace smoke blower 3 and a sludge burner 4 of a boiler; the rotor wing 10 is a columnar body, a plurality of rotary rods are uniformly distributed on the rotor wing 10, the rotor wing 10 is arranged in the bottom of the sludge drying equipment 1, one end of the rotor wing is connected with a motor, and the other end of the rotor wing is opposite to the material outlet; the primary chain conveyor belt 5 and the secondary chain conveyor belt 6 are arranged in the sludge drying equipment 1 above the rotor wing 10 in a staggered manner from top to bottom in sequence; a first flue gas inlet 8 is formed in the position, close to the upper part of the inner wall of the sludge drying device 1, of the input end of the primary chain conveyor belt 5, and a second flue gas inlet 9 is formed in the position, close to the upper part of the inner wall of the sludge drying device 1, of the input end of the secondary chain conveyor belt 6; the high-temperature smoke taking port 11 and the medium-temperature smoke taking port 12 are arranged on flues at the outlet of the boiler low-temperature superheater and the inlet of the economizer, are respectively provided with a control valve, and are respectively connected with the first smoke inlet 8 and the second smoke inlet 9 through a converging pipeline;

wherein, the first flue gas inlet 8 and the second flue gas inlet 9 are respectively provided with a control valve on the pipeline connected with the converging pipeline.

In the practical application process, the specific implementation steps are as follows:

1) high-temperature flue gas is extracted from a high-temperature flue gas taking port 11 of the boiler by a flue gas blower 3, medium-temperature flue gas is extracted from a medium-temperature flue gas taking port 12 of the boiler, the high-temperature flue gas and the medium-temperature flue gas are mixed into mixed flue gas serving as a drying medium of sludge, and the mixed flue gas is sent into the sludge drying equipment 1 through a first flue gas inlet 8 and a second flue gas inlet 9 on the sludge drying equipment; the temperature of the mixed flue gas can be adjusted by adjusting the use amount of the high-temperature flue gas and the medium-temperature flue gas;

2) the sludge enters the sludge drying device 1 through the material inlet 7 and firstly falls on the primary chain conveyor belt 5, the sludge moves forwards along with the primary chain conveyor belt 5, and the mixed flue gas entering from the first flue gas inlet 8 dries the sludge on the primary chain conveyor belt 5; the primary chain conveyor belt 5 can increase the retention time and the effective heat exchange area of the sludge in the sludge drying equipment 1, and the mixed flue gas in the first flue gas inlet 8 can increase the sludge moisture evaporation efficiency, so that the sludge is prevented from being hardened and agglomerated in the drying process;

3) the sludge on the primary chain conveyor belt 5 falls onto the secondary chain conveyor belt 6 again, and then moves forwards along with the secondary chain conveyor belt 6, and the mixed flue gas entering from the second flue gas inlet 9 is used for continuously drying the sludge; when the sludge on the primary chain conveyor belt 5 falls, the sludge turns over and falls onto the secondary chain conveyor belt 6, the secondary chain conveyor belt 6 can increase the retention time and the effective heat exchange area of the sludge in the sludge drying equipment 1 again, and the mixed flue gas in the second flue gas inlet 9 can increase the sludge moisture evaporation efficiency again;

4) the sludge on the secondary chain conveyor belt 6 finally falls on the rotor wing 10, the sludge is impacted and crushed into small particles by the plurality of rotary rods through the rotation of the rotor wing 10, the sludge particles are thrown upwards, and the small sludge particles are dispersed above the rotor wing 10, so that the effective heat exchange area can be increased, and the sludge is further dried by smoke;

5) the dried sludge small particles are carried by the flue gas and enter the fan mill 2 under the suction action of the fan mill 2 and the furnace smoke fan 3, the dried sludge in the fan mill 2 is crushed into fine powder, the fine sludge powder is carried by the flue gas and is sent into a sludge burner 4 arranged on a boiler furnace, and the fine sludge powder enters the furnace for incineration through the sludge burner 4.

Based on any one of the devices, the invention also provides a method for treating sludge by using high-temperature flue gas, which comprises the following steps,

firstly, a furnace smoke fan 3 is used for taking high-temperature smoke and medium-temperature smoke from a high-temperature smoke taking port 11 and a medium-temperature smoke taking port 12 of a boiler respectively, and the two kinds of smoke are mixed and then are sent into a sludge drying device 1 through a smoke inlet; meanwhile, the sludge is sent into the sludge drying equipment 1 through a material inlet 7;

secondly, the sludge entering the sludge drying device 1 falls on the chain conveyor belt firstly, the sludge moves forwards along with the primary chain conveyor belt 5 and is dried by hot flue gas entering from a flue gas inlet, the dried sludge falls on the rotor wing 10 from the secondary chain conveyor belt 6, and is crushed and thrown upwards by the rotor wing 10, so that the water in the sludge is further evaporated to dryness to form small-particle dry sludge;

and finally, carrying the small-particle dry sludge into the fan mill 2 by the flue gas, crushing the small-particle dry sludge into fine powder in the fan mill 2, carrying the fine powder of the sludge into a sludge burner 4 arranged on a boiler hearth by the flue gas, and finally finishing combustion treatment of the fine powder of the sludge in the high-temperature hearth.

Wherein the content of the first and second substances,

the sludge firstly falls on the primary chain conveyor belt 5 and moves forwards along with the primary chain conveyor belt 5, and is dried by hot flue gas entering from the first flue gas inlet 8; then falls into a secondary chain conveyor belt 6 from the primary chain conveyor belt 5, and is dried by hot flue gas entering from a second flue gas inlet 9 while continuously moving forwards along with the secondary chain conveyor belt 6; finally, the sludge falls on the rotor wing 10 from the secondary chain conveyor belt 6, and the sludge is crushed by the rotor wing 10 and is thrown upwards;

the control valves are used for respectively controlling the extraction amount of the flue gas in the high-temperature flue gas taking port 11 and the middle-temperature flue gas taking port 12 and adjusting the temperature of the mixed flue gas entering the flue gas inlet.