CN212559898U

CN212559898U - Sludge drying treatment recycling system

Info

Publication number: CN212559898U
Application number: CN202021087102.9U
Authority: CN
Inventors: 高益
Original assignee: Jiangsu Jinshengnuo Energy Saving And Environmental Protection Technology Co ltd
Current assignee: Jiangsu Jinshengnuo Energy Saving And Environmental Protection Technology Co ltd
Priority date: 2020-06-13
Filing date: 2020-06-13
Publication date: 2021-02-19
Anticipated expiration: 2030-06-13

Abstract

The invention discloses a sludge drying treatment recycling system, which comprises the following steps: the sludge is transferred to a closed feeding device through an inclined screw conveyor and is conveyed to a gasification reactor, the sludge and a heat exchange device are subjected to heat exchange through the gasification reactor, the sludge is subjected to thermochemical reaction through the heat exchange device, and a foam body structure is damaged; according to the invention, the sludge is conveyed to the screw conveyer in a centralized manner, the sludge is transferred to the gasification reactor through the sealed feeding device, and heat exchange treatment is carried out through the heat exchange device, so that the foam structure in the sludge is damaged, meanwhile, a thermochemical reaction can be carried out, further, moisture in the sludge is separated out in a steam form, and the gasified sludge is subjected to a dewatering effect through the arranged carbonization reactor, so that the sludge is converted into organic carbon particles, the cyclic utilization of the heat value of the sludge is realized, and the effect of removing the residual moisture in the sludge is greatly improved.

Description

Sludge drying treatment recycling system

Technical Field

The invention relates to the technical field of sludge drying treatment, in particular to a sludge drying treatment recycling system.

Background

The sludge is solid sediment produced in the process of water and sewage treatment, the purpose of sludge drying is to remove or reduce the water in the sludge, and the sludge form in the drying process is mainly divided into three stages: firstly, in the wet area, the water content of the sludge at the stage is higher and is more than 60 percent, and the sludge has good free fluidity and is easy to flow into a drying device; secondly, the water content of the sludge in the viscous zone is slightly reduced, the sludge has certain viscosity and is difficult to flow freely within the range of 40% -60%, and the viscous zone is an area which needs to be avoided in the sludge drying treatment process; thirdly, in a granular area, the water content of the sludge in the stage is reduced to be below 40 percent, the sludge is granular and is easy to be mixed with wet sludge or other substances, and the sludge moisture removal process is mainly divided into two stages: the evaporation process of the vaporization of the surface moisture of the sludge and the diffusion process of the internal moisture of the sludge, the evaporation process: the moisture on the surface of the material is vaporized, and because the water vapor pressure on the surface of the material is lower than the water vapor partial pressure in the medium (gas), the moisture is moved into the medium from the surface of the material, and the diffusion process is as follows: is a mass transfer process closely related to vaporization, when the moisture on the surface of the material is evaporated to form a material surface with a humidity lower than the internal humidity, at this time, the moisture is transferred from the inside to the surface by the driving force of heat, the two processes are continuously and alternately carried out, basically reflecting the drying mechanism, the drying is completed by two complementary and parallel processes of surface water vaporization and internal water diffusion, generally speaking, the diffusion speed of the moisture is continuously reduced along with the increase of the dryness of the sludge particles, the vaporization speed of the surface moisture is increased along with the increase of the dryness of the sludge particles, as the diffusion speed is mainly driven by the heat energy, for a thermal convection system, the drier generally adopts a parallel flow process, the heat energy supply of most processes is gradually reduced, thus causing the speed reduction when the high dryness product is dried in the latter half section, for the heat transfer system, when the surface moisture content of the sludge is reduced, the heat exchange efficiency is rapidly reduced, so that certain defects still exist when the residual moisture in the sludge is treated, and the requirements of the prior art are not met.

Disclosure of Invention

In order to achieve the purpose, the invention adopts a technical scheme that: the sludge drying treatment recycling system comprises the following steps: s1, firstly, conveying sludge of a sewage treatment plant to a treatment base through a transport vehicle, weighing and metering the sludge through a wagon balance, and then pouring the sludge into a storage bin; s2, fixedly installing a push rod valve gate, an inclination angle screw conveyor and a horizontal screw conveyor at the bottom of the storage bin, opening the push rod valve gate to enable sludge to fall into the horizontal screw conveyor, and conveying the sludge to the inclination angle screw conveyor through the horizontal screw conveyor; s3, transferring the sludge to a closed feeding device through an inclined-angle screw conveyor and conveying the sludge to a gasification reactor, carrying out heat exchange on the sludge and a heat exchange device through the gasification reactor, carrying out thermochemical reaction on the sludge through the heat exchange device, destroying a foam body structure, and separating water in the sludge into steam from the sludge; s4, conveying the sludge reacted by the gasification reactor into a carbonization reactor for continuous reaction to reduce the water content of the sludge, converting the sludge into organic carbon particles, and conveying the organic carbon particles into a boiler hopper through a screw conveyor to enter a hearth through a boiler feeding device for high-temperature combustion; s5, conveying the slag generated by high-temperature combustion of the boiler into a large-inclination-angle belt conveyor through a scraper conveyor, storing the slag in a slag bin, and after the bin is full, driving a transport vehicle to the position below the bin to enable the slag to fall into the transport vehicle after a bin door is opened to realize outward brick production; s6, subsequently, loading the auxiliary fuel into an auxiliary fuel hopper through a loader, conveying the auxiliary fuel into a boiler hopper through a belt conveyor, mixing the auxiliary fuel with organic carbon particles, and feeding the mixture into a hearth for high-temperature combustion; s7, then, burning the organic carbon and the auxiliary fuel in the boiler at high temperature to enable the generated heat to be recycled through the sludge gasification and carbonization treatment time limit of the circulating pump; and S8, finally, discharging water vapor generated in the drying, sludge gasification and carbonization processes of the organic carbon from the equipment through an induced draft fan, and simultaneously performing spraying, cooling, alkali washing, oxidation and demisting treatment and standard discharge through an exhaust funnel.

The screw conveyor is fixedly connected with a material switching device through bolts, the material switching device is in electric signal connection with an organic carbon storage outward transportation system, and the screw conveyor and the belt conveyor are used as outward transportation devices of redundant organic carbon.

Wherein, the water for spraying and cooling is water in a sewage treatment plant, and the sewage treatment plant is used as a treatment base of wastewater.

The sludge drying treatment recycling system is used for treating 100T/d of sludge production line, and the occupied area is five to six mu.

Wherein, the feed bin is buried formula feed bin, and the single check storage capacity of feed bin is 30 cubic meters, and the feed bin is equipped with four altogether, the feed bin is used for the transfer storage device of mud, and the push rod valve gate is electronic slide valve, and the push rod valve gate is equipped with four altogether, horizontal screw conveyer specifically is horizontal shaftless screw conveyer, and horizontal screw conveyer is equipped with two altogether, inclination screw conveyer is equipped with two altogether.

The closed feeding device is specifically closed conveying equipment, the conveying capacity of the closed feeding device is 5t/h, the treatment capacity of the gasification reactor is 5t/h, and the treatment capacity of the carbonization reactor is 5 t/h.

The conveying capacity of the large-inclination-angle belt conveyor is 2t/h, the large-inclination-angle belt conveyor is used as a lifting conveying device of materials, the conveying capacity of the spiral conveyor is 2t/h, and the material switching device is used as a switching device of organic carbon and a hopper bin.

The boiler also comprises a first air preheater and a second air preheater, wherein the first air preheater and the second air preheater are used as devices for exchanging heat between boiler tail gas and gasification and carbonization inlet gas.

The proposal is that the sludge is intensively conveyed to the screw conveyer, the sludge is transferred to the gasification reactor through the sealed feeding device and is subjected to heat exchange treatment through the heat exchange device, so that the bubble body structure in the sludge is damaged and simultaneously the thermochemical reaction can be carried out, further separating the water in the sludge in the form of steam, leading the gasified sludge to further implement the dewatering effect through the arranged carbonization reactor, thereby converting the sludge into organic carbon particles to realize the cyclic utilization of the heat value of the sludge, further greatly improving the effect of removing the residual water in the sludge, simultaneously, the organic carbon particles and the auxiliary fuel are conveyed into the boiler through the screw conveyer to be burnt at high temperature, so that the active organic carbon particles and the auxiliary fuel are obtained and can be used as production raw materials of cement, concrete and insulating bricks, and the effect of effectively utilizing sludge resources is realized.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

In the following, reference will be made to various embodiments of the invention. However, embodiments may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will fully convey the scope of the invention to those skilled in the art. In other instances, well-known functions or constructions may not be described or shown in detail to avoid obscuring the subject matter of the present disclosure.

The first embodiment is as follows:

in this embodiment, the method includes the following steps:

firstly, conveying sludge of a sewage treatment plant to a treatment base through a transport vehicle, weighing and metering the sludge by weighbridge, then pouring the sludge into a storage bin, fixedly installing a push rod valve gate, an inclination angle screw conveyor and a horizontal screw conveyor at the bottom of the storage bin, enabling the sludge to fall into the horizontal screw conveyor by opening the push rod valve gate, transmitting the sludge to the inclination angle screw conveyor through the transmission of the horizontal screw conveyor, then transmitting the sludge to a closed feeding device through the inclination angle screw conveyor and transmitting the sludge to a gasification reactor, carrying out heat exchange on the sludge and a heat exchange device through the gasification reactor, carrying out thermochemical reaction on the sludge through the heat exchange device, destroying a bubble body structure, changing water in the sludge into vapor, separating the vapor from the sludge, then, conveying the sludge reacted by the gasification reactor into a carbonization reactor for continuous reaction, and reducing the moisture content of the sludge, converting sludge into organic carbon particles, conveying the organic carbon particles into a boiler hopper through a screw conveyor, conveying the organic carbon particles into a boiler feeding device through a boiler for high-temperature combustion, conveying slag generated by the high-temperature combustion of the boiler into a large-inclination-angle belt conveyor through a scraper conveyor, conveying the slag into a slag bin for storage, driving a transport vehicle to the bin after the bin is full to enable the slag to fall into the transport vehicle after a bin door is opened to realize outward transportation and brick making, loading auxiliary fuel into an auxiliary fuel hopper through a loader, conveying the auxiliary fuel into the boiler hopper through a belt conveyor to be mixed with the organic carbon particles, conveying the mixture into a hearth for high-temperature combustion, and then, combusting the organic carbon and the auxiliary fuel in the boiler at a high temperature to enable the generated heat to be recycled through a sludge gasification and carbonization time limit of a circulating pump, and finally, drying the organic carbon through an induced draft fan, and drying the organic carbon in the boiler, The device comprises a spiral conveyer, a material switching device, an organic carbon storage outward transportation system, a belt conveyer, a sludge drying treatment recycling system, a storage bin, a push rod valve gate, an underground storage bin, a transfer storage device and an electric gate valve, wherein water vapor generated in the sludge gasification and carbonization processes is discharged from the device, is subjected to spraying, cooling, alkali washing, oxidation and demisting treatment and is discharged after reaching the standard through an exhaust funnel, the spiral conveyer is fixedly connected with the material switching device through bolts, the material switching device is electrically connected with the organic carbon storage outward transportation system, the spiral conveyer and the belt conveyer are used as the outward transportation device of redundant organic carbon, the water for spraying and cooling is water in the sewage treatment plant, the sewage treatment plant is used as a treatment base of wastewater, the sludge drying treatment recycling system treats 100T/d sludge production lines with the floor area of five to six mu, the storage bin is a buried storage bin, the single-grid storage capacity of the storage, and push rod valve floodgate is equipped with four altogether, horizontal screw conveyer specifically is horizontal shaftless screw conveyer, and horizontal screw conveyer is equipped with two altogether, inclination screw conveyer is equipped with two altogether, airtight feed arrangement specifically is closed conveying equipment, and airtight feed arrangement's transmission capacity is 5t/h, gasification reactor's handling capacity is 5t/h, carbonization reactor's handling capacity is 5t/h, large inclination belt conveyer's transmission capacity is 2t/h, large inclination belt conveyer is used for the promotion conveyor as the material, screw conveyer's transmission capacity is 2t/h, material auto-change over device is used for as the auto-change over device of organic carbon and hopper feed bin, the boiler still includes first air preheater and second air preheater, first air preheater and second air preheater are used for as boiler tail gas and gasification, and the air preheater, A device for carbonizing and air-intake heat exchange.

Example two:

in this embodiment, the method includes the following steps:

sludge of a sewage treatment plant is transported to the location of a project by a vehicle, weighed and measured by a wagon balance and poured into a storage bin, a push rod gate valve and a horizontal spiral conveyor are arranged at the bottom of the storage bin, the gate valve is opened, the sludge falls into the horizontal spiral conveyor, is conveyed into the inclined spiral conveyor, then enters a gasification reactor through a closed feeding device, and in the gasification reactor, the sludge and a heat exchange device exchange heat, the sludge undergoes a thermochemical reaction, a foam body structure is damaged, and water in the sludge is changed into vapor to be separated from the sludge; the sludge after gasification reaction falls into a carbonization reactor for continuous reaction, the water content of the sludge is further reduced, the sludge is converted into organic carbon particles, then the organic carbon particles enter a boiler hopper through a screw conveyor, the organic carbon particles enter a hearth through a boiler feeding device for high-temperature combustion, slag generated by high-temperature combustion is conveyed into a large-inclination-angle belt conveyor through a scraper conveyor and then enters a slag bin for storage, after the bin is full, a transport vehicle is driven to the lower part of the bin, a bin door is opened, the slag falls into a car hopper of the transport vehicle and is transported out for brick making, auxiliary fuel is loaded into an auxiliary fuel hopper through a loader and is conveyed into the boiler hopper through the belt conveyor to be mixed with the organic carbon particles to enter the hearth for high-temperature combustion, an organic carbon storage and transportation system is designed in the process, when a single device fails to be overhauled, the boiler hopper cannot load the continuously produced organic carbon particles, the material switching device is started, the organic carbon conveyed by the screw conveyor enters the organic carbon storage bin through belt conveying, redundant organic carbon is transported and disposed, the organic carbon and auxiliary fuel are combusted at high temperature in the boiler, the generated heat is treated through sludge gasification and carbonization of the circulating pump, the cyclic utilization of the sludge heat value is realized, water vapor is generated in the organic carbon drying process and the sludge gasification and carbonization processes, the water vapor is discharged from the equipment through the draught fan, then the water vapor is discharged after reaching the standard through the spraying, cooling, alkali washing, oxidation and demisting processes and the exhaust funnel, the water used for tail gas spraying, washing, cooling, dedusting and deodorization can be recycled in the sewage treatment plant, the wastewater is discharged into the sewage treatment plant to be treated and discharged after reaching the standard, the complete equipment is provided with an independent system, the occupied area is small, the occupied area of a 100T/d sludge treatment production line is 5-6 mu, and the technology is suitable for sludge dispersion, complete equipment with different treatment scales can be selected, designed, manufactured and installed according to the sludge yield or the scale of a sludge centralized treatment field, and the sludge treatment process is not influenced by external environments such as temperature, climate and the like;

the flue gas of incinerator is mainly dust particles, water vapor and inorganic acid gas, the treatment adopts the main method of cyclone separation and alkaline water spraying washing treatment process, the waste heat of boiler waste heat flue gas is utilized, the temperature is reduced to below 100 ℃, most of the smoke dust is separated from the gas after entering cyclone separator, then the smoke dust enters into desulfurizing and dust-removing tower, the tower is internally provided with atomizing spray head, the spraying water (alkaline solution) is pressurized by spraying pump and sprayed out in atomizing state, and is mixed with the flue gas entering into the tower, the acid gas and alkaline agent in the flue gas are reacted into inorganic salt, the residual dust in the flue gas is wet and settled and enters into the spraying water, the water vapor is cooled into water, the flue gas after spraying and washing has moisture content, acid gas content and dust content reduced, the temperature is reduced to about 45 ℃, then the flue gas enters into low temperature plasma for demisting and whitening, enters into exhaust port for reaching the standard and discharging, the organic carbon is dried and gasified and, a small part of peculiar smell gas, the temperature of the gas before entering the tail gas treatment system is about 100 ℃, the gas is conveyed by a draught fan and enters a Venturi treatment device, the Venturi changes the convection velocity of the spray water and the gas through the change of the pipe diameter, the high-speed convection mass transfer of the spray water, the medicament and the gas is realized, the temperature of the treated gas is reduced to about 60 ℃, then the gas enters a chemical washing tower for washing, a filler and a demisting layer are distributed in the chemical washing tower, the gas and the reagent solution fully react in the chemical washing tower to reduce the odor and the temperature of the gas, the temperature of the tail gas is reduced to below 45 ℃ after the chemical washing treatment, then the mixture is mixed with boiler tail gas and enters a low-temperature plasma tower for deodorization and demisting treatment, the mixture enters a ventilator for emission and is simply discharged, and the tail gas treated by the processes meets the index discharge specified in the control standard for municipal solid waste incineration pollutants.

In the several embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

Claims

1. A sludge drying treatment recycling system is characterized by comprising the following steps:

s1, firstly, conveying sludge of a sewage treatment plant to a treatment base through a transport vehicle, weighing and metering the sludge through a wagon balance, and then pouring the sludge into a storage bin;

s2, fixedly installing a push rod valve gate, an inclination angle screw conveyor and a horizontal screw conveyor at the bottom of the storage bin, opening the push rod valve gate to enable sludge to fall into the horizontal screw conveyor, and conveying the sludge to the inclination angle screw conveyor through the horizontal screw conveyor;

s3, transferring the sludge to a closed feeding device through an inclined-angle screw conveyor and conveying the sludge to a gasification reactor, carrying out heat exchange on the sludge and a heat exchange device through the gasification reactor, carrying out thermochemical reaction on the sludge through the heat exchange device, destroying a foam body structure, and separating water in the sludge into steam from the sludge;

s4, conveying the sludge reacted by the gasification reactor into a carbonization reactor for continuous reaction to reduce the water content of the sludge, converting the sludge into organic carbon particles, and conveying the organic carbon particles into a boiler hopper through a screw conveyor to enter a hearth through a boiler feeding device for high-temperature combustion;

s5, conveying the slag generated by high-temperature combustion of the boiler into a large-inclination-angle belt conveyor through a scraper conveyor, storing the slag in a slag bin, and after the bin is full, driving a transport vehicle to the position below the bin to enable the slag to fall into the transport vehicle after a bin door is opened to realize outward brick production;

s6, subsequently, loading the auxiliary fuel into an auxiliary fuel hopper through a loader, conveying the auxiliary fuel into a boiler hopper through a belt conveyor, mixing the auxiliary fuel with organic carbon particles, and feeding the mixture into a hearth for high-temperature combustion;

s7, then, burning the organic carbon and the auxiliary fuel in the boiler at high temperature to enable the generated heat to be recycled through the sludge gasification and carbonization treatment time limit of the circulating pump;

and S8, finally, discharging water vapor generated in the drying, sludge gasification and carbonization processes of the organic carbon from the equipment through an induced draft fan, and simultaneously performing spraying, cooling, alkali washing, oxidation and demisting treatment and standard discharge through an exhaust funnel.

2. The system of claim 1, further comprising:

an organic carbon storage and outward transport system;

the screw conveyer is fixedly connected with a material switching device through bolts, the material switching device is in electric signal connection with an organic carbon storage outward transportation system, and the screw conveyer and the belt conveyer are used as outward transportation devices of redundant organic carbon.

3. The system of claim 1, wherein the water for spraying and cooling is water in a sewage treatment plant, and the sewage treatment plant is used as a treatment base for wastewater.

4. The system of claim 1, wherein the sludge drying treatment recycling system occupies a floor area of five to six acres for 100T/d sludge production line.

5. The sludge drying treatment recycling system of claim 1, wherein the bin is a buried bin, the storage capacity of the bin is 30 cubic meters per unit, the bin is provided with four storage units, the bin is used for the transfer storage device of sludge, the push rod valve gate is an electric gate valve, the push rod valve gate is provided with four storage units, the horizontal screw conveyor is specifically a horizontal shaftless screw conveyor, the number of the horizontal screw conveyors is two, and the number of the inclined screw conveyors is two.

6. The system of claim 1, wherein the closed feeding device is a closed conveying device, the conveying capacity of the closed feeding device is 5t/h, the treatment capacity of the gasification reactor is 5t/h, and the treatment capacity of the carbonization reactor is 5 t/h.

7. The sludge drying treatment recycling system of claim 2, wherein the conveying capacity of the belt conveyor with the large inclination angle is 2t/h, the belt conveyor with the large inclination angle is used as a lifting conveying device for materials, the conveying capacity of the screw conveyor is 2t/h, and the material switching device is used as a switching device for organic carbon and a hopper bin.

8. The system of claim 1, wherein the boiler further comprises a first air preheater and a second air preheater, and the first air preheater and the second air preheater are used as devices for exchanging heat between boiler tail gas and gasification and carbonization inlet gas.