CN216550321U

CN216550321U - Municipal sludge and agriculture and forestry garden remainder coprocessing system

Info

Publication number: CN216550321U
Application number: CN202023142258.5U
Authority: CN
Inventors: 彭江红
Original assignee: Zhangjiagang Baihe Technology Co ltd
Current assignee: Zhangjiagang Baihe Technology Co ltd
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2022-05-17
Anticipated expiration: 2030-12-23

Abstract

The utility model relates to a municipal sludge and agriculture and forestry park residue cooperative processing system which comprises a dehydration device, a particle forming machine, a cooling device and a particle bin, wherein the dehydration device is used for mixing and dehydrating municipal sludge and agriculture and forestry park residues, the cooling device is used for cooling particles prepared by the particle forming machine, the particle bin is used for storing the cooled particles, and conveying devices are respectively arranged between the dehydration device and the particle forming machine, between the particle forming machine and the cooling device and between the cooling device and the particle bin. The treatment system is adopted to mix and dehydrate the municipal sludge and the agriculture and forestry park residues, press the mixture into granular fuel, and then mix and burn the granular fuel with the fire coal, so that the problem of treatment of the municipal sludge and the agriculture and forestry park residues is fundamentally solved, the municipal sludge and the agriculture and forestry park residues are eliminated, part of fire coal is replaced, and carbon dioxide is reduced, so that the reduction, energy and harmless treatment of the municipal sludge and the agriculture and forestry park residues and the reduction of the use amount of the coal are really realized, and the treatment system has a huge market prospect.

Description

Municipal sludge and agriculture and forestry garden remainder coprocessing system

Technical Field

The utility model belongs to the technical field of solid waste treatment, and particularly relates to a system for cooperatively treating municipal sludge and residues in an agriculture and forestry garden.

Background

For municipal sludge, the most effective treatment method is incineration, including separate incineration and co-incineration.

The investment of the independent incineration device is extremely high, and simultaneously, the treatment cost is extremely high due to the high water content, the low heat value and the high ash content of the municipal sludge. Taking an urban sludge incineration device put into production at the end of 2016 years in a certain city as an example, 800 tons (with 80% of water content) of sludge are treated per day, the total investment is about 5 hundred million yuan, and the disposal cost per ton is as high as 850 yuan.

With the further deepening of the urbanization step in China, the generation amount of the municipal sludge is increased year by year, and the development of a low-cost municipal sludge disposal technology is urgent.

The existing energy and resource utilization projects of the residues in the agriculture and forestry parks in China generally have the problems of small device scale, high investment, low operating rate, poor economic benefit and the like, and the conversion rate is not high, so that secondary pollution is generated. Taking a crop straw power generation project in Jiangsu as an example, the scale of the device is 5MW (less than 1% of the scale of a domestic large-scale thermal power device), the accumulated investment is over 7000 ten thousand yuan since 2009, the operation rate is low due to the influence of the raw material supply season, and the secondary pollution is caused because the operation temperature is low, the carbon conversion rate is low, and the ash contains a large amount of carbon. At present, almost no technology is available in China to realize the pollution-free treatment of crop straws in the real sense.

Also, there are patents relating to a method and an apparatus for co-processing municipal sludge and straw, for example, chinese patent CN110240386A discloses a device and a method for co-processing straw and sludge, the method comprising: (1) crushing, drying and anaerobic pyrolysis are carried out on the straws in sequence, and cooling is carried out to obtain straw pyrolytic carbon; (2) mixing and tempering straw pyrolytic carbon and sludge, and then carrying out solid-liquid separation on the obtained mixed and tempered product; drying and dehydrating the obtained solid phase, then carrying out anaerobic pyrolysis, and cooling to obtain modified sludge pyrolytic carbon; treating the obtained liquid phase with sewage to make the liquid phase reach the discharge standard; (3) and (3) burning pyrolysis gas generated by the anaerobic pyrolysis of the dry and crushed straws to serve as energy sources for the anaerobic pyrolysis of the straws, the solid-phase drying and the solid-phase anaerobic pyrolysis, and using flue gas generated by the solid-phase drying and the anaerobic pyrolysis as the energy sources for the drying of the straws. Although the method carries out the cooperative treatment of the municipal sludge and the straw substances, the treatment method is complex, the adopted treatment device is also complex, the construction investment cost of the device is high, and the treatment cost is also high.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a low-cost, reduced, energy-saving and harmless municipal sludge and agriculture and forestry residue cooperative treatment system aiming at the defects of the prior art.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model provides an urban sludge and agriculture and forestry garden remainder cooperative processing system, is including being used for dewatering device and the particle forming machine that urban sludge and agriculture and forestry garden remainder mix the dehydration, set up between dewatering device and the particle forming machine and be used for with the material after urban sludge and agriculture and forestry garden remainder mix the dehydration to carry out the conveyor that the granulation was carried out in the particle forming machine, processing system still including be used for to carry out refrigerated cooling device and be used for storing the granule storehouse of granule after the cooling to the granule that particle forming machine prepared, set up between particle forming machine and the cooling device and be used for with the granule that the particle forming machine prepared carries to conveyor of cooling device, set up between cooling device and the granule storehouse and be used for carrying the granule after the cooling to the conveyor of granule storehouse.

According to some implementation aspects of the utility model, the processing system further comprises a smashing device for smashing the residues of the agriculture and forestry park, and a conveying device for feeding the residues of the agriculture and forestry park smashed by the smashing device into the dewatering device is arranged between the smashing device and the dewatering device.

Further, the processing system further comprises a first raw material bin for storing the municipal sludge and a second raw material bin for storing the agricultural and forestry residues, a conveying device for conveying the municipal sludge into the dewatering device is arranged between the first raw material bin and the dewatering device, and a conveying device for conveying the agricultural and forestry residues into the crushing device is arranged between the second raw material bin and the crushing device.

Further preferably, the conveying devices arranged between the first raw material bin and the dewatering device, between the dewatering device and the particle forming machine, and between the cooling device and the particle bin are screw conveyors, and the conveying devices arranged between the second raw material bin and the crushing device, and between the particle forming machine and the cooling device are conveyor belts.

According to some embodiments of the utility model, the pellet former is a ring die former.

According to some embodiments of the utility model, the treatment system further comprises a drain connected to the dewatering device for draining wastewater, the dewatering device being an indirect dryer.

According to some embodiments of the utility model, the cooling device comprises a cooling bin for containing the pellets prepared by the pellet forming machine and a blower for blowing air into the cooling bin.

According to some implementation aspects of the utility model, the processing system further comprises a coal burning bin for storing the fire coal, a reactor for burning the mixture of the fire coal and the particles, a flue gas processing device connected with the reactor through a flue gas pipeline, and a recovery bin for recovering ash in the reactor, wherein a conveying belt for conveying the fire coal into the reactor is arranged between the coal burning bin and the reactor, and the particles in the particle bin are conveyed to the conveying belt through the conveying device to be mixed with the fire coal and then conveyed together into the reactor for burning.

Further, the reactor is a circulating fluidized bed reactor.

Further, the particles in the particle bin are conveyed by a screw conveyor to be mixed with the fire coal on the conveyor belt.

Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

the treatment system is adopted to mix and dehydrate the municipal sludge and the agriculture and forestry garden residues, press the mixture into the granular fuel, and then mix and burn the granular fuel with the fire coal, so that the problem of treatment of the municipal sludge and the agriculture and forestry garden residues is fundamentally solved, the municipal sludge and the agriculture and forestry garden residues are eliminated, part of the fire coal is replaced, and carbon dioxide is reduced, so that the reduction, energy and harmless treatment of the municipal sludge and the agriculture and forestry garden residues and the reduction of the use amount of the coal are really realized. Most cities in China have the problem of disposing urban sludge and garden residues, and the method has a huge market prospect.

The treatment system is adopted to carry out cooperative treatment on the municipal sludge and the residues of the agriculture and forestry gardens, so that the investment cost of device construction is low, and the treatment cost is also low.

Drawings

FIG. 1 is a schematic structural diagram of a system for co-processing municipal sludge and agricultural and forestry residues according to an embodiment of the present invention;

in the figure: 1. a first raw material bin; 2. a second raw material bin; 3. a crushing device; 4. a dewatering device; 5. a particle forming machine; 6. a particle bin; 7. a coal burning bin; 8. a cooling device; 9. a reactor; 10. a flue gas treatment device; 11. a recovery bin; 12. a flue gas duct; 13. and a water discharge pipe.

Detailed Description

The utility model is further described below with reference to the drawings of the specification:

the municipal sludge and agriculture and forestry residue cooperative processing system shown in fig. 1 comprises a first raw material bin 1 for storing municipal sludge, a second raw material bin 2 for storing agriculture and forestry residues, a crushing device 3 for crushing the agriculture and forestry residues, a dehydration device 4 for mixing and dehydrating the municipal sludge and the crushed agriculture and forestry residues, a particle forming machine 5 for granulating the materials after mixing and dehydrating the municipal sludge and the agriculture and forestry residues, a cooling device 8 for cooling particles prepared by the particle forming machine 5, and a particle bin 6 for storing the cooled particles, wherein a screw conveyor for conveying the municipal sludge into the dehydration device 4 is arranged between the first raw material bin 1 and the dehydration device 4, a conveyor belt for conveying the agriculture and forestry residues to the crushing device 3 is arranged between the second raw material bin 2 and the crushing device 3, a conveying device used for conveying agriculture and forestry residues crushed by the crushing device 3 to the dewatering device 4 and mixing and dewatering municipal sludge is arranged between the crushing device 3 and the dewatering device 4, a screw conveyor used for conveying the dewatered materials to the particle forming machine 5 for granulation is arranged between the dewatering device 4 and the particle forming machine 5, a conveying belt used for conveying the particles to the cooling device 8 for cooling is arranged between the particle forming machine 5 and the cooling device 8, and a screw conveyor used for conveying the cooled particles to the particle bin 6 is arranged between the cooling device 8 and the particle bin 6.

In this example, the dehydration device 4 is a jacketed indirect dryer, and the dehydration device 4 is connected with a drain pipe 13 for discharging wastewater. The pellet forming machine 5 is a ring die forming machine.

In this example, the cooling device 8 includes a cooling chamber for accommodating the pellets prepared by the pellet forming machine 5 and a blower for blowing air into the cooling chamber to cool the pellets, and the pellets prepared by the pellet forming machine 5 start to be cooled while passing through the conveyor belt, and the conveyor belt is conveyed into the cooling chamber and is blown by the blower to further cool the pellets.

The treatment system also comprises a coal burning bin 7 for storing coal, a reactor 9 for carrying out combustion reaction on the mixture of the coal and particles, a flue gas treatment device 10 connected with the reactor 9 through a flue gas pipeline 12 and a recovery bin 11 for recovering ash in the reactor 9, wherein the reactor 9 is a circulating fluidized bed reactor, a conveying belt for conveying the coal in the coal burning bin 7 to the reactor 9 is arranged between the coal burning bin 7 and the reactor 9, the particles in the particle bin 6 are conveyed to the conveying belt through a screw conveyor to be mixed with the coal, and then are conveyed to the reactor 9 together with the coal for carrying out combustion reaction.

The municipal sludge and the agriculture and forestry residue are subjected to cooperative treatment by adopting the treatment system, the municipal sludge and the crushed agriculture and forestry residue are pressed into granular fuel, the agriculture and forestry residue can remove water in the municipal sludge, the heat value of the mixed material can be increased, the mixture improves the forming characteristic, and the granular fuel changes the fuel characteristic of the municipal sludge; then, the high temperature (more than or equal to 850 ℃) of the coal-fired circulating fluidized bed is utilized to lead the toxic and harmful substances in the municipal sludge to be completely oxidized and decomposed and the heavy metals in the ionic state to be converted into the oxidation state, and simultaneously, the high-temperature incineration of the residues in the agriculture and forestry parks is reduced to the maximum extent, the feeding ratio of the coal-fired to the particles is 9:1, and the total proportion of the particle fuel blended incineration is about 10 percent, so that the existing coal-fired circulating fluidized bed boiler reactor does not need to be reformed, and the investment for constructing a separate incineration device is greatly saved. The flue gas generated after combustion is efficiently treated by a post-treatment device of a large-scale coal-fired thermal power plant, ash is processed into building bricks, and heavy metals are reasonably cured.

By adopting the municipal sludge and agriculture and forestry garden residue synergistic treatment technology, the municipal sludge and agriculture and forestry garden residue are consumed, part of fire coal is replaced, and carbon dioxide is reduced, so that the reduction, energy regeneration and harmless treatment of the municipal sludge and agriculture and forestry garden residue and the reduction of the use amount of coal are really realized, and most cities in China have the problem of treatment of the municipal sludge and the agriculture and forestry garden residue.

Taking industrial co-combustion of urban sludge and agriculture and forestry remainder granular fuel of certain Liaoning enterprises as an example, 10 tons of urban sludge, agriculture and forestry remainder granular fuel and 90 tons of fire coal are used together, the co-combustion proportion is 10%, the used furnace type is a circulating fluidized bed with 75 tons/hour, and the co-combustion duration is about 11 hours. In the blending combustion process, the coal-fired circulating fluidized bed runs completely normally.

A third party, a certain environment detection company, respectively extracts flue gas, fly ash and coal ash samples before and after blending combustion, and detects toxic and harmful substances such as dioxin in the flue gas, heavy metal and dioxin in the fly ash and heavy metal in the coal ash.

The detection result shows that: the dioxin content in the flue gas before and after the mixed burning is very small and has little change, and the dioxin content before the mixed burning is about 0.0098(SD =0.0022) ng.TEQ/Nm³After the addition of the raw material, the content of dioxin was about 0.0130(SD =0.0060) ng³This data is only one tenth of the EU, iOne fiftieth of the national standard. The concentration of the heavy metals and toxic and harmful substances in the fly ash and the coal ash is reduced after the fly ash and the coal ash are mixed and burnt. For example, the total chromium content in the coal ash is 0.05 mg/L before blending combustion and is reduced to less than 0.03 mg/L after blending combustion; the arsenic content is 0.425 mg/L before blending and is reduced to 0.352mg/L after blending, which is reduced by about 20 percent. Practice shows that the municipal sludge and the agriculture and forestry residue granular fuel are completely mixed and burnt in the coal-fired circulating fluidized bed, and the process route is safe and reliable.

The above-mentioned embodiments are provided only for illustrating the technical idea and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and to implement the present invention, and not to limit the protection scope of the present invention by this, and all equivalent changes or modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.

Claims

1. The utility model provides a municipal sludge and agriculture and forestry garden remainder cooperative processing system which characterized in that: the processing system comprises a dehydration device and a particle forming machine, wherein the dehydration device is used for mixing and dehydrating municipal sludge and agricultural and forestry residues, a conveying device is arranged between the dehydration device and the particle forming machine and is used for conveying materials obtained after mixing and dehydrating the municipal sludge and the agricultural and forestry residues into the particle forming machine for granulation, the processing system also comprises a cooling device and a particle bin, the cooling device is used for cooling particles prepared by the particle forming machine, the particle bin is used for storing the cooled particles, a conveying device is arranged between the particle forming machine and the cooling device and is used for conveying the particles prepared by the particle forming machine to the cooling device, and a conveying device is arranged between the cooling device and the particle bin and is used for conveying the cooled particles to the particle bin;

the treatment system also comprises a coal burning bin for storing the fire coal, a reactor for burning the mixture of the fire coal and the particles, a flue gas treatment device connected with the reactor through a flue gas pipeline, and a recovery bin for recovering ash in the reactor, wherein a conveying belt for conveying the fire coal to the reactor is arranged between the coal burning bin and the reactor, and the particles in the particle bin are conveyed to the conveying belt through the conveying device to be mixed with the fire coal and then conveyed to the reactor together for burning.

2. The municipal sludge and agriculture and forestry residue co-processing system according to claim 1, wherein: the processing system further comprises a smashing device used for smashing the agricultural and forestry residue, and a conveying device used for feeding the agricultural and forestry residue smashed by the smashing device into the dewatering device is arranged between the smashing device and the dewatering device.

3. The municipal sludge and agriculture and forestry residue co-processing system according to claim 2, wherein: the treatment system further comprises a first raw material bin for storing the urban sludge and a second raw material bin for storing the agricultural and forestry residues, a conveying device for conveying the urban sludge into the dewatering device is arranged between the first raw material bin and the dewatering device, and a conveying device for conveying the agricultural and forestry residues into the crushing device is arranged between the second raw material bin and the crushing device.

4. The municipal sludge and agriculture and forestry residue co-processing system according to claim 3, wherein: the conveying devices arranged between the first raw material bin and the dewatering device, between the dewatering device and the particle forming machine and between the cooling device and the particle bin are respectively screw conveyors, and the conveying devices arranged between the second raw material bin and the crushing device and between the particle forming machine and the cooling device are respectively conveying belts.

5. The municipal sludge and agriculture and forestry residue co-processing system according to claim 1, wherein: the particle forming machine is a ring die forming machine.

6. The municipal sludge and agriculture and forestry residue co-processing system according to claim 1, wherein: the treatment system also comprises a drain pipe which is connected with the dewatering device and is used for discharging the waste water, and the dewatering device is an indirect drier.

7. The municipal sludge and agriculture and forestry residue co-processing system according to claim 1, wherein: the cooling device comprises a cooling bin for containing the granules prepared by the granule forming machine and a blower for blowing air into the cooling bin.

8. The municipal sludge and agriculture and forestry residue co-processing system according to claim 1, wherein: the reactor is a circulating fluidized bed.

9. The municipal sludge and agriculture and forestry residue co-processing system according to claim 1, wherein: and the particles in the particle bin are conveyed to the conveying belt through the screw conveyor to be mixed with the fire coal on the conveying belt, and then are conveyed to the reactor together for combustion.