CN219239491U

CN219239491U - Sludge treatment system

Info

Publication number: CN219239491U
Application number: CN202223570654.7U
Authority: CN
Inventors: 郝向军; 刘子龙; 郭强; 孙志强; 余利平; 都业富; 李军; 魏升; 韩利敏; 王建刚
Original assignee: Inner Mongolia Kangsheng Environmental Protection Technology Co ltd
Current assignee: Inner Mongolia Kangsheng Environmental Protection Technology Co ltd
Priority date: 2022-12-26
Filing date: 2022-12-26
Publication date: 2023-06-23
Anticipated expiration: 2032-12-26

Abstract

The utility model discloses a sludge treatment system, which comprises: a hydrothermal treatment device, a filter press, an incineration device and an anaerobic sludge bed reactor, wherein the hydrothermal treatment device comprises: the sludge after the hydrothermal treatment is sent to a filter press; the filtrate after filter pressing enters an anaerobic mud bed reactor, and the solid filter residue after filter pressing is sent into an incinerator through a screw conveyor; the incineration device comprises: the upper part of the outlet of the rotary furnace is connected with a gas combustion chamber through a first pipeline, and the gas combustion chamber is connected with the heat conduction jacket through a second pipeline. The utility model solves the problems of complex process, high running cost and poor treatment effect of the original sludge treatment system equipment.

Description

Sludge treatment system

Technical Field

The utility model belongs to the technical field of environmental protection, and particularly relates to a sludge treatment system.

Background

In recent years, as the urban process is faster and faster, the generation amount and treatment rate of urban domestic sewage are higher and higher, and the total amount of urban sewage is increased at a faster rate in spite of various methods for reducing the output of urban sewage. At present, the sludge of large-scale sludge treatment plants in cities is generally dehydrated by anaerobic digestion and dosing to reach the water content of about 80 percent, and then is transported to a sanitary landfill for landfill. 80% of the sludge still has certain flowing property, which brings inconvenience to landfill operation and has hidden trouble of secondary pollution. With the strengthening of the national final disposal management of municipal biomass waste such as sludge, municipal waste pollutants are a major issue in garbage disposal plants. Some rubbish wastes have complex components, high water content and difficult dehydration, contain high-concentration organic matters, pathogenic microorganisms, heavy metal ions and other harmful substances, are often accompanied with malodor, and can cause serious secondary pollution if not properly treated, so that ecological environment and human health are endangered.

The existing sludge cake disposal method for sludge generated by a sewage treatment plant after anaerobic digestion, hydrothermal treatment and dehydration and drying treatment has the advantages of composting, landfill and incineration, and compared with the prior art, the method has the advantages of harm reduction, decrement, harmlessness and the like, and achieves the final disposal of the sludge.

The incineration is divided into indirect incineration and direct incineration, wherein the indirect incineration needs to be mixed with other fuels (such as coal), is mostly used for transformation of thermal power plants, has smaller requirements on particles of sludge, has higher mixing degree with the coal, has limitation on the mixing proportion, and can influence the combustion performance of the coal due to higher mixing proportion; the direct combustion is an energy-saving treatment mode, namely the sludge can be directly connected into a furnace for incineration after a small amount of auxiliary fuel is added, but if the water content of the sludge is higher and the heat value is lower, a large amount of auxiliary fuel is required to be consumed for direct furnace-connection incineration, the operation cost is high, and a pretreatment procedure of the sludge is required to be added if necessary.

The mode of the existing sludge treatment system needs to consume a large amount of auxiliary fuel, has high operation cost, complicated adopted equipment and high cost, can not well utilize the generated heat energy, and designs a sludge treatment system which can fully utilize the heat energy to circulate and has good treatment effect, thus being the technical problem to be solved at present.

Disclosure of Invention

The utility model aims to provide a sludge treatment system to solve the problems of complex process and poor treatment effect of the original sludge treatment system equipment.

The technical scheme adopted by the utility model is as follows:

a sludge treatment system comprising: a hydrothermal treatment device, a filter press, an incineration device and an anaerobic sludge bed reactor, wherein,

the hydrothermal treatment apparatus includes: the sludge after the hydrothermal treatment is sent to the filter press;

the filter press is used for carrying out filter pressing on the sludge subjected to the hydrothermal treatment, wherein filter liquor after the filter pressing enters the anaerobic sludge bed reactor, and solid filter residues after the filter pressing are sent into the incineration device through a screw conveyor;

the incineration device includes: the rotary furnace, the rotary furnace outside is equipped with the heat conduction jacket that sets up with rotary furnace outer wall clearance, the export top of rotary furnace is through first gas tube connection gas combustion chamber, the gas combustion chamber passes through the second trachea connection the heat conduction jacket, the export below of rotary furnace is the discharge gate.

Further, the sludge treatment system further comprises: and the waste heat boiler is connected with the heat conduction jacket.

Further, the two heating tanks are two self-steam pipes which are used for supplying high-pressure steam in common, the two heating tanks are connected with the slurrying tank in parallel through respective feeding pipelines, and are connected with the hydrothermal reaction tank through discharging pipelines.

Further, the two heating tanks work continuously and alternately through the set program control valve.

Further, the exhaust ports at the tops of the two heating tanks are connected with the air inlet and the exhaust port of the slurrying tank through two pipelines, so that the pressure of the heating tank and the pressure of the slurrying tank are the same during working, and the feeding process is gravity self-flowing.

Further, flow regulating valves are arranged on the feeding pipeline and the discharging pipeline.

Further, a high-temperature fan is arranged on the first air pipe, a high-temperature fan is also arranged on the second air pipe, and an ignition nozzle is further arranged at the bottom of the gas combustion chamber.

Further, liquid level sensors, temperature sensors and pressure sensors are arranged in the slurrying tank, the heating tank, the hydrothermal reaction tank and the flash tank.

Compared with the prior art, the sludge treatment system provided by the utility model realizes the whole-course automatic treatment of garbage and wastes by the cooperation of the hydrothermal treatment device, the incineration device, the pyrolysis gas recycling structure on the incineration device and the waste heat boiler, has high degree of automation, and improves the working efficiency and the energy utilization rate of the whole garbage treatment system. Meanwhile, the heating function of the traditional hydrothermal reactor is transferred into the heating tank, so that the size of the stirrer in the hydrothermal reaction tank is greatly reduced, the stirring power consumption of the stirrer is reduced, the stirring intensity is improved, and the two heating tanks are used for alternately working and running, so that the working efficiency is improved, and good quality is provided for subsequent combustion.

Drawings

Fig. 1 is a schematic diagram of the construction of a sludge treatment system according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram showing a specific construction of a sludge treatment system according to an embodiment of the present utility model.

Fig. 3 is a schematic structural view of a hydrothermal treatment apparatus according to an embodiment of the present utility model.

Fig. 4 is a schematic structural view of an incineration device according to an embodiment of the present utility model.

Detailed Description

The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model. Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a manufacturer of hardware or software may refer to a component by different names. The description and claims do not take the form of an element with differences in names, but rather with differences in functions. The description hereinafter sets forth a preferred embodiment for practicing the utility model, but is not intended to limit the scope of the utility model, as the description is given for the purpose of illustrating the general principles of the utility model. The scope of the utility model is defined by the appended claims.

The utility model will now be described in further detail with reference to the drawings and to specific examples.

Referring to fig. 1 to 2, an embodiment of the present utility model discloses a sludge treatment system, comprising: the device comprises a hydrothermal treatment device a, a filter press c, an incineration device b and an anaerobic sludge bed reactor d, wherein the hydrothermal treatment device a carries out hydrothermal treatment on raw sludge conveyed from a raw material bin, the collision probability of particles such as sludge is increased through the action of high-temperature high-pressure saturated steam, the colloid structure and cell substances in biomass waste can be effectively destroyed, the mixing and heating are more sufficient, and the dewatering property and biodegradability of various biomasses in the sludge are improved. The filter press c is used for pressing and filtering the sludge subjected to the hydrothermal treatment to form solidified filter residues and liquefied filtered water, the filter residues enter the incineration device b for pyrolysis, the solid pollutants are further damaged in structure, secondary pollution is prevented, and the filtrate enters the anaerobic sludge bed reactor d for anaerobic digestion treatment.

Referring to fig. 3, the hydrothermal treatment apparatus a includes: the slurry tank 11, the heating tank 12, the hydrothermal reaction tank 13 and the flash tank 14 are connected in sequence, and the sludge after the hydrothermal treatment is sent to the filter press c.

The slurrying tank 11 may be positioned at a higher elevation than the warming tank 12 so that the waste may gravity flow into the warming tank 12 using a pressure differential or be pumped into the warming tank 12. The heating tanks 12 are two self-steam pipes which are arranged in parallel and positioned at the same height and are used for providing high-temperature and high-pressure steam from the outside, the two heating tanks 12 are connected with the slurrying tank 11 through respective feeding pipelines in a parallel mode and connected with the hydrothermal reaction tank 13 through discharging pipelines, wherein flow control valves 16 are respectively arranged on the feeding pipelines and the discharging pipelines to control the feeding speed and the discharging speed so as to maintain the balance of the system, and check valves are also arranged on the feeding pipes and the discharging pipes to prevent the heating tanks 12 from flowing backwards to the slurrying tank 11 under the high-pressure working condition and prevent the steam or waste sludge in the hydrothermal reaction tank 13 from flowing backwards to the heating tanks 12. On the one hand, the effect of setting up the intensification jar 12 alone mainly lies in reducing the volume and the volume of hydrothermal reaction jar 13, and traditional hydrothermal reaction jar 13 collection hydrothermal intensification and hydrothermal reaction are in an organic whole, therefore the agitator size of hydrothermal reaction jar 13 is big, and the installed power is big, and stirring intensity is not high, in this embodiment, with the whole or most heating function transfer of hydrothermal reactor to in the intensification jar 12, reduced the agitator size in the hydrothermal reaction jar 13 greatly, reduced the stirring power consumption of agitator, improved stirring intensity. The self-steam with higher pressure enters the two heating tanks 12 from the self-steam pipe, and under the action of the stirrer, the slurry and the steam in the two heating tanks 12 are quickly mixed and absorbed, and are heated to the required reaction temperature; the heated material (mainly sludge) is then fed in turn to the hydrothermal reaction tank 13 by means of pumping. Because the two heating tanks 12 are arranged in the embodiment, each heating tank 12 is provided with a program control valve, the feeding and discharging of the two heating tanks 12 are independently designed pipelines, and each pipeline communicated with the slurrying tank 11 and the hydrothermal tank is provided with a discharging valve, so that the working can be started alternately according to a preset program, the feeding and discharging can be performed sequentially, the continuous supply of a steam source can be realized, and the treatment efficiency is improved.

In the hydrothermal reaction tank 13, saturated self-steam from the outside at high temperature and high pressure can be introduced into the tank from the lower part, and the saturated self-steam is fully mixed with the raw materials in the tank and stays for a period of time, so that the raw materials fully react, and basically the cell structures of all biomasses are destroyed after the treatment of the hydrothermal reaction tank 13, thereby realizing the effective sterilization. The hydrothermally treated feedstock will be pumped to flash tank 14 where it is flashed in a rapid reduced pressure and temperature manner that results in a reduced temperature feedstock and further destruction of cellular structures in some microorganisms during the pressure release process. The flash tank 14 is provided with a relief valve.

In this embodiment, liquid level sensors, temperature sensors and pressure sensors are also disposed in the slurrying tank 11, the heating tank 12, the hydrothermal reaction tank 13 and the flash tank 14 to detect the liquid level, temperature and pressure in different stages.

The waste after flash evaporation treatment is conveyed into a filter press c through a screw feeder, the waste is subjected to filter pressing through the filter press c, the water content of solid waste is reduced through the filter pressing, wherein the filter liquor after filter pressing enters an anaerobic sludge bed reactor d from an outlet at the bottom of the filter press c so as to carry out subsequent environmental protection treatment on waste water, and the solid filter residues after filter pressing are conveyed into an incinerator b through the screw feeder.

Through the incinerator, the damage of high temperature to solid pollutants can be realized, secondary pollution is effectively controlled, the solid materials can be crushed by the arranged crusher before entering the incinerator, and the crushed materials are sent into the rotary kiln 21 of the incinerator b by the screw conveyor. Referring to fig. 4, in the present embodiment, the incineration device b includes: the rotary furnace 21, wherein one end of the rotary furnace 21 is a material inlet, the other end is a material outlet, and a discharging nozzle is arranged below the outlet. The outside of the rotary furnace 21 is provided with a heat conducting jacket 22 which is arranged in a gap with the outer wall of the rotary furnace 21, the heat conducting jacket 22 is hollow and cylindrical, the heat conducting jacket 22 is wound back to the rotary furnace 21, the upper part of an outlet of the rotary furnace 21 is connected with a gas combustion chamber 23 through a first gas pipe, a high-temperature fan 24 is arranged on the first gas pipe so as to introduce fuel gas of some biomass (mainly pyrolysis gas converted from organic matters, pyrolysis oil and the like) formed by pyrolysis into the combustion chamber 23, the bottom of the gas combustion chamber 23 is also provided with an ignition nozzle, an external auxiliary blower is matched to supply air into the gas combustion chamber 23, the combusted gas is continuously heated again in the gap formed by the rotary furnace 21 and the heat conducting jacket 22, the gas combustion chamber is connected with the heat conducting jacket 22 through a second gas pipe, and the second gas pipe is also provided with the high-temperature fan 24 so as to introduce hot gas generated after combustion into the heat conducting jacket 22, thereby greatly saving energy sources and improving sustainable recycling of energy sources.

An air outlet is further formed in one side of the heat conducting jacket 22 of the rotary furnace 21, the air outlet is connected with an air inlet of the waste heat boiler e so as to transfer part of redundant heat energy waste gas into the waste heat boiler e, and the working principle of the waste heat boiler is that fuel oil, fuel gas and fire coal are combusted to generate high-temperature smoke to release heat, the high-temperature smoke enters a hearth, then enters a waste heat recovery device of a front smoke box, then enters a smoke tube, finally enters a waste heat recovery device in a flue of a rear smoke box, and the high-temperature smoke is changed into low-temperature smoke to be discharged into the atmosphere through a chimney. The waste heat boiler e greatly improves the utilization rate of heat released by fuel combustion, so the boiler is quite energy-saving. Through the design of the waste heat boiler e, the utilization rate of energy sources is further improved.

Compared with the prior art, the sludge treatment system provided by the embodiment of the application well combines and cooperates the hydrothermal treatment device a, the filter press c, the incineration device b, the gas recycling structure on the incineration device b, the waste heat boiler e and the like, so that the whole-course automatic treatment of garbage and waste is realized, the automation degree is high, the working efficiency and the energy utilization rate of the system are improved, meanwhile, the heating function of the traditional hydrothermal reactor is transferred to the heating tank, the size of the stirrer in the hydrothermal reaction tank is greatly reduced, the stirring electricity consumption of the stirrer is reduced, the stirring intensity is improved, and the two heating tanks are used for alternately working and running, so that the working efficiency and the fault tolerance are improved.

It should be noted that the foregoing description is only a preferred embodiment of the present utility model, and is not intended to limit the scope of the utility model, and the present utility model may also be modified by material and structure of the above-mentioned various components or by substitution of technical equivalents. Therefore, all equivalent structural changes made in the specification and the illustrated content of the present utility model, or direct or indirect application to other related technical fields are included in the scope of the present utility model.

Claims

1. A sludge treatment system, comprising: a hydrothermal treatment device, a filter press, an incineration device and an anaerobic sludge bed reactor, wherein,

the incineration device includes: the rotary furnace is provided with a heat conduction jacket arranged in a clearance with the outer wall of the rotary furnace, the upper part of an outlet of the rotary furnace is connected with a gas combustion chamber through a first gas pipe, and the gas combustion chamber is connected with the heat conduction jacket through a second gas pipe.

2. The sludge treatment system of claim 1 wherein the sludge treatment system further comprises: and the waste heat boiler is connected with the heat conduction jacket.

3. The sludge treatment system of claim 2 wherein said warming tanks are two self-steaming tubes that commonly provide high pressure steam, two of said warming tanks being connected in parallel to said slurrying tank by respective feed lines and to the hydrothermal reaction tank by discharge lines.

4. A sludge treatment system as claimed in claim 3 wherein both of said warming tanks are operated continuously and alternately by programmed valves provided.

5. The sludge treatment system of claim 3 or 4 wherein flow regulating valves are provided on both the feed line and the discharge line.

6. The sludge treatment system of claim 1, wherein the high temperature fan is disposed on both the first air pipe and the second air pipe, and an ignition nozzle is further disposed at the bottom of the gas combustion chamber.

7. The sludge treatment system of claim 1 wherein the slurrying tank, the warming tank, the hydrothermal reaction tank, and the flash tank are each further provided with a liquid level sensor, a temperature sensor, and a pressure sensor.