CN223150450U - A municipal sludge drying system - Google Patents
A municipal sludge drying systemInfo
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- CN223150450U CN223150450U CN202422714577.0U CN202422714577U CN223150450U CN 223150450 U CN223150450 U CN 223150450U CN 202422714577 U CN202422714577 U CN 202422714577U CN 223150450 U CN223150450 U CN 223150450U
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Abstract
本发明公开了一种城市污泥干化系统，包括干燥器、物料收集器、余热回收器、冷凝器、换热器和热风炉，干燥器通入高温干燥风对待处理的城市污泥干化处理，物料收集器对干化成品进行收集，物料收集器的气相出口接余热回收器，余热回收器回收气流余热得到冷凝水和低温含湿风，余热回收器的气相出口接冷凝器，冷凝器冷凝处理低温含湿风得到冷凝水和低温干燥风；冷凝器的气相出口接换热器的第一介质入口，换热器的第二介质入口接热风炉的气相出口，热风炉用于加热空气得到高温热风；低温干燥风与高温热风换热得到高温干燥风，换热器的第一介质出口接干燥器为其提供高温干燥风，由此形成循环风路，利用循环风对干燥器持续供热。
The invention discloses a municipal sludge drying system, comprising a dryer, a material collector, a waste heat recovery device, a condenser, a heat exchanger and a hot air furnace. The dryer introduces high-temperature dry air to dry the municipal sludge to be treated, the material collector collects the dried product, the gas phase outlet of the material collector is connected to the waste heat recovery device, the waste heat recovery device recovers the waste heat of the air flow to obtain condensed water and low-temperature humid air, the gas phase outlet of the waste heat recovery device is connected to the condenser, the condenser condenses and treats the low-temperature humid air to obtain condensed water and low-temperature dry air; the gas phase outlet of the condenser is connected to the first medium inlet of the heat exchanger, the second medium inlet of the heat exchanger is connected to the gas phase outlet of the hot air furnace, the hot air furnace is used to heat the air to obtain high-temperature hot air; the low-temperature dry air exchanges heat with the high-temperature hot air to obtain high-temperature dry air, the first medium outlet of the heat exchanger is connected to the dryer to provide the high-temperature dry air, thereby forming a circulating air path, and the circulating air is used to continuously supply heat to the dryer.
Description
Technical Field
The invention relates to an urban sludge drying system, and belongs to the field of sludge treatment.
Background
The urban sludge has high water content, various bacteria, viruses and parasitic organisms are parasitic by high-content organic matters, and meanwhile, the urban sludge also contains some toxic heavy metal compounds, and the difficulty of sludge drying treatment is determined by the complexity of the sludge structure.
At present, a dryer is mainly used for drying sludge, and the dryer has large treatment capacity of drying sludge, but also has large dust generation amount and pollutant discharge amount, serious environmental pollution and potential safety hazard. Meanwhile, the traditional sludge drier uses steam, kerosene and the like as heat sources, so that the energy consumption is high. Therefore, how to develop an urban sludge drying device with low energy consumption and high efficiency, which accords with the time theme of low carbon and environmental protection, becomes a research difficulty in the technical field.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an urban sludge drying system which aims at reducing energy consumption of sludge drying, saving production cost, reducing emission of toxic and harmful gases, being beneficial to environmental protection, and avoiding the risk of dust explosion caused by site dust rising due to overheat of wet sludge.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The utility model provides an urban sludge desiccation system, includes desicator, material collector, waste heat recoverer, condenser, heat exchanger and hot-blast furnace, the desicator lets in the high temperature dry wind and treats the municipal sludge desiccation of handling, material collector collects the desiccation finished product, wherein:
The gas phase outlet of the material collector is connected with the waste heat recovery device, the waste heat recovery device recovers air flow waste heat to obtain condensate water and low-temperature wet wind, the gas phase outlet of the waste heat recovery device is connected with the condenser, the low-temperature wet wind is condensed and treated by the condenser to obtain condensate water and low-temperature dry wind, the gas phase outlet of the condenser is connected with the first medium inlet of the heat exchanger, the second medium inlet of the heat exchanger is connected with the gas phase outlet of the hot blast stove, the hot blast stove is used for heating air to obtain high-temperature hot wind, the low-temperature dry wind exchanges heat with the high-temperature hot wind to obtain high-temperature dry wind, the first medium outlet of the heat exchanger is connected with the dryer to provide the high-temperature dry wind for the dryer, and therefore a circulating wind path is formed, and the circulating wind is utilized for continuously supplying heat to the dryer.
In one embodiment, the waste heat recoverer is provided with a gas phase inlet and a solid phase inlet, the gas phase inlet is connected with a gas phase outlet of the material collector, the solid phase inlet is connected with wet municipal sludge to be treated, and the wet municipal sludge is preheated in the waste heat recoverer by utilizing the waste heat of the gas flow.
In one embodiment, the municipal sludge drying system further comprises a pretreatment device, wherein the pretreatment device is connected with the solid phase outlet of the waste heat recoverer, and the preheated sludge is subjected to pretreatment of screening, extrusion and crushing.
In one embodiment, the heat exchanger is a finned tube type heat exchanger or a plate type heat exchanger, the heat exchanger conducts heat transfer through the wall surface, and two fluid media are not in direct contact, so that heat exchange is achieved between high-temperature hot air and low-temperature dry air, and circulating air is formed.
In one embodiment, the municipal sludge drying system further comprises an exhaust gas treatment device, wherein the exhaust gas treatment device is connected with the second medium outlet of the heat exchanger, and the tail gas obtained after the heat exchange of the high-temperature hot air is treated and then discharged after reaching the standard.
In one embodiment, the municipal sludge drying system is a closed negative pressure system.
The invention also provides an urban sludge drying process, which is realized by using the urban sludge drying system, and comprises the following steps:
heating air by using a hot blast stove to obtain high-temperature hot air;
Drying municipal sludge to be treated by using a dryer through high-temperature drying wind, and sending the dried sludge into a material collector;
Carrying out gas-solid separation by utilizing a material collector, collecting a dried finished product, and discharging high-temperature airflow;
Recovering the waste heat of the high-temperature air flow by using a waste heat recoverer to obtain condensed water and low-temperature wet wind;
Condensing the low-temperature wet wind by using a condenser to obtain condensed water and low-temperature dry wind;
And utilizing a heat exchanger to exchange heat between the low-temperature drying air and the high-temperature hot air to obtain high-temperature drying air and low-temperature tail gas, and sending the high-temperature drying air into the dryer to form a circulating air path to continuously supply heat to the dryer.
In one embodiment, the temperature of the high-temperature hot air is 300-350 ℃, the temperature range of the high-temperature dry air is 290-300 ℃, moisture is not contained, the temperature of the low-temperature wet air is 50-60 ℃, the moisture content is 20-30%, the temperature of the low-temperature dry air is 30-40 ℃, moisture is not contained, the water content of the municipal sludge to be treated is 70-80%, and the water content of a dried finished product is 1-10%.
In one embodiment, the waste heat recoverer is a solid-gas heat exchange device, and the wet municipal sludge to be treated is sent into the waste heat recoverer to be preheated by the high-temperature airflow and then sent into the dryer to be dried.
Compared with the prior art, the invention can fully utilize the heat in the system, effectively save energy, reduce energy consumption, reduce the emission of harmful tail gas and is suitable for popularization and use.
Drawings
FIG. 1 is a schematic diagram of the municipal sludge drying system according to the invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, the invention discloses an urban sludge drying system, which mainly comprises a dryer, a material collector, a waste heat recoverer, a condenser, a heat exchanger, a hot blast stove and the like, wherein the dryer is used for drying urban sludge to be treated by introducing high-temperature drying air, and the material collector is mainly used for collecting dried finished products. The hot blast stove is used for heating air to obtain high-temperature hot air and provides the initial heat source.
The invention connects the gas phase outlet of the material collector with the waste heat recoverer, and uses the waste heat recoverer to recover the waste heat of the air flow discharged by the material collector, and the condensate water and the low-temperature wet air are obtained through treatment. The invention connects the gas phase outlet of the waste heat recoverer with the condenser, and uses the condenser to condense and treat the low-temperature wet wind to obtain condensed water and low-temperature dry wind. The invention uses high-temperature hot air as a second medium and uses low-temperature dry air as a first medium, and the low-temperature dry air exchanges heat with the high-temperature hot air to obtain high-temperature dry air. The first medium outlet of the heat exchanger is connected with the dryer to provide high-temperature drying wind for the dryer, so that a circulating wind path is formed, and the circulating wind is utilized to continuously supply heat to the dryer.
In the embodiment of the invention, the waste heat recoverer is provided with a gas phase inlet and a solid phase inlet, the gas phase inlet is connected with a gas phase outlet of the material collector, the solid phase inlet is connected with wet municipal sludge to be treated, and the wet municipal sludge is preheated in the waste heat recoverer by utilizing the waste heat of the gas flow.
Further, one side of the waste heat recoverer is provided with a solid phase inlet for feeding wet municipal sludge, the other side of the waste heat recoverer is provided with a gas phase inlet for inputting high-temperature air flow discharged by the material collector, the middle upper part of the waste heat recoverer is provided with a gas phase outlet for discharging low-temperature wet air, the bottom of the waste heat recoverer is provided with a solid phase outlet and a liquid phase outlet for discharging preheated sludge and condensed water respectively, and the waste heat recoverer recovers heat in a high-temperature drying process of the dryer as a heat source of the preheating process, so that the heat utilization rate is improved, the difficulty of the drying process is reduced, and the cost of drying treatment of wet sludge is reduced. The waste heat recoverer can be specifically selected as a flue gas waste heat recoverer, and a heat exchange element is made of a nonmetallic material, so that heat carried by flue gas is recycled, and the flue gas waste heat recoverer has the advantages of high efficiency and low energy consumption.
In the embodiment of the invention, the condenser is used for condensing low-temperature wet wind, low-temperature dry wind is obtained after dehydration, and condensed water is discharged from a condensed water outlet. In the invention, the high-temperature air flow discharged by the material collector has the condition of temperature reduction in the process of passing through the waste heat recoverer and the condenser, and in the two stages, part of water vapor is liquefied and condensed into water, and the generated condensed wastewater is sent to a wastewater treatment device for purification treatment.
In the embodiment of the invention, the municipal sludge drying system further comprises a pretreatment device, wherein the pretreatment device is connected with the solid phase outlet of the waste heat recoverer, and the preheated sludge is subjected to pretreatment such as screening, extrusion, crushing and the like, so that the volume of the sludge is reduced, the heated surface is smoother, the heated area is larger, the content of active substances in the sludge is reduced, the stability and durability of the sludge are improved, and the cost and risk of the sludge in subsequent treatment and disposal can be greatly reduced.
In the embodiment of the invention, the heat exchanger is a conventional heat exchanger such as a finned tube type heat exchanger or a plate type heat exchanger, and the heat exchanger conducts heat transfer through the wall surface and ensures that two fluid media are not in direct contact, so that heat exchange is realized between high-temperature hot air and low-temperature dry air, and circulating air is formed. This circulated air carries out drying treatment to the mud in the follow-up desicator, and circulated wind can recycle repeatedly, has avoided the waste of heat energy, and harmful gaseous material can not be discharged simultaneously, has reduced environmental pollution, owing to contactless, can not continue to produce polluting waste gas moreover, does not have any pollutant emission in the desiccation in-process, comparatively environmental protection and energy saving.
In the embodiment of the invention, the municipal sludge drying system further comprises an exhaust gas treatment device, wherein the exhaust gas treatment device is connected with the second medium outlet of the heat exchanger, and the exhaust gas obtained after the heat exchange of the high-temperature hot air is treated and then discharged after reaching the standard.
In the embodiment of the invention, the municipal sludge drying system is a closed negative pressure system. The negative pressure comes from the system fan, and the system fan can be generally arranged between the material collector and the waste heat recoverer, so that under the negative pressure pneumatic conveying system, materials and dust can not fly outwards, the environment protection and safety of a drying environment are guaranteed, and the adoption of the closed negative pressure system has the advantages of good air tightness, simple system and reliable operation, and can effectively prevent dust and odor from leaking into the surrounding environment in the drying sludge feeding process, so that the pollution safety risk is caused.
The sludge drying system forms a closed sludge drying environment and a circulating air path to cooperate, so that the odor components of the sludge are prevented from being dissipated into the external environment in the sludge drying process, the corrosion of the sludge harmful substances to the machine is also prevented, and the service life of the drying system is prolonged.
According to the system, the municipal sludge drying process comprises the following steps:
Heating air by using a hot blast stove to obtain high-temperature hot air in the range of 300-350 ℃, and introducing the high-temperature hot air into a heat exchanger instead of directly introducing the high-temperature hot air into a dryer;
Drying municipal sludge to be treated by using a dryer through high-temperature drying wind which does not contain moisture at 290-300 ℃, taking away the moisture in wet sludge by the high-temperature drying wind to achieve the aim of full drying, and sending the dried sludge into a material collector, wherein the original municipal sludge contains 70-80% of water;
Carrying out gas-solid separation by utilizing a material collector, collecting a dried finished product, realizing gas-solid separation, and discharging high-temperature air flow to the next stage, wherein the water content of the dried finished product is 1% -10%;
The waste heat of the high-temperature air flow is recovered by a waste heat recoverer to obtain condensed water and low-temperature wet wind with the temperature of about 50-60 ℃, wherein the low-temperature wet wind approximately contains 20-30% of water;
Condensing the low-temperature wet wind by using a condenser to obtain condensed water and low-temperature drying wind at about 30-40 ℃, wherein the low-temperature drying wind does not contain moisture after the condensation treatment;
And the heat exchanger is utilized to enable the low-temperature drying air and the high-temperature hot air to fully exchange heat, so that high-temperature drying air and low-temperature tail gas are obtained, the high-temperature drying air is sent into the dryer to supply heat for a drying link, and a circulating air path can be formed to continuously supply heat for the dryer.
In the system shown in fig. 1, the optimized drying process and its principle can be described as:
The method is characterized in that wet municipal sludge is put into a waste heat recoverer for preheating, the preheated sludge is discharged from a solid phase outlet of the waste heat recoverer and enters a pretreatment process, the air permeability of the sludge is increased in the pretreatment process, so that the drying effect of the sludge in the dryer is more uniform, high-temperature drying air exchanges heat with the wet sludge, the waste heat of high-temperature air flow is recovered by the waste heat recoverer, the heat of the waste heat recoverer can be reused for drying the sludge, the heat of the waste heat recoverer in the drying process can be fully utilized, saturated heat steam in the waste heat recoverer is reduced in temperature, condensed water is condensed, the condensed water can be discharged from a water outlet of the waste heat recoverer, low-temperature wet air is discharged from an air outlet of the waste heat recoverer and enters a condenser, condensed water is obtained due to the temperature reduction, low-temperature wet air is output after the condensation treatment of the condenser, the low-temperature drying air exchanges heat with high-temperature hot air heated by a heat source in a heat exchanger to obtain high-temperature drying air, and the high-temperature drying air is input into the dryer to form a closed loop of circulating air.
In conclusion, the invention has a plurality of advantages and use values, has great improvement on structure and function, has obvious progress in technology and has good practical value.
The above examples are not intended to be exhaustive of the preferred forms of the invention, and the invention is capable of numerous forms.
The present invention is not limited in any way by the foregoing preferred embodiments, and the present invention has been disclosed in the foregoing preferred embodiments, but is not limited thereto, and any person skilled in the art will appreciate that the present invention can be embodied in the form of a program for use in the present invention without departing from the scope of the appended claims, any simple modification, equivalent variation and modification of the above embodiments according to the technical principles of the present invention still fall within the scope of the technical proposal of the present invention, although any minor variation or modification of the above embodiments can be made by utilizing the technical matters disclosed above to make equivalent changes.
Claims (6)
1. The utility model provides an urban sludge desiccation system, includes desicator, material collector, waste heat recoverer, condenser, heat exchanger and hot-blast furnace, the desicator lets in the high temperature dry wind and treats the municipal sludge desiccation of handling, material collector collects its characterized in that to the desiccation finished product:
The gas phase outlet of the material collector is connected with the waste heat recovery device, the waste heat recovery device recovers air flow waste heat to obtain condensate water and low-temperature wet wind, the gas phase outlet of the waste heat recovery device is connected with the condenser, the low-temperature wet wind is condensed and treated by the condenser to obtain condensate water and low-temperature dry wind, the gas phase outlet of the condenser is connected with the first medium inlet of the heat exchanger, the second medium inlet of the heat exchanger is connected with the gas phase outlet of the hot blast stove, the hot blast stove is used for heating air to obtain high-temperature hot wind, the low-temperature dry wind exchanges heat with the high-temperature hot wind to obtain high-temperature dry wind, the first medium outlet of the heat exchanger is connected with the dryer to provide the high-temperature dry wind for the dryer, and therefore a circulating wind path is formed, and the circulating wind is utilized for continuously supplying heat to the dryer.
2. The municipal sludge drying system of claim 1, wherein:
The waste heat recoverer is provided with a gas phase inlet and a solid phase inlet, the gas phase inlet is connected with a gas phase outlet of the material collector, the solid phase inlet is connected with wet municipal sludge to be treated, and the wet municipal sludge is preheated in the waste heat recoverer by utilizing the waste heat of the air flow.
3. The municipal sludge drying system of claim 2, wherein:
The municipal sludge drying system also comprises a pretreatment device, wherein the pretreatment device is connected with a solid phase outlet of the waste heat recoverer, and the preheated sludge is subjected to pretreatment of screening, extrusion and crushing.
4. The municipal sludge drying system of claim 1, wherein:
The heat exchanger is a finned tube type heat exchanger or a plate type heat exchanger, the heat exchanger conducts heat transfer through the wall surface, and two fluid media are not in direct contact, so that heat exchange is achieved between high-temperature hot air and low-temperature dry air, and circulating air is formed.
5. The municipal sludge drying system of claim 1, wherein:
The municipal sludge drying system further comprises an exhaust gas treatment device, wherein the exhaust gas treatment device is connected with a second medium outlet of the heat exchanger, and the tail gas obtained after high-temperature hot air heat exchange is treated and then discharged after reaching standards.
6. The municipal sludge drying system according to any one of claims 1 to 5, wherein:
The municipal sludge drying system is a closed negative pressure system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202422714577.0U CN223150450U (en) | 2024-11-07 | 2024-11-07 | A municipal sludge drying system |
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| CN202422714577.0U CN223150450U (en) | 2024-11-07 | 2024-11-07 | A municipal sludge drying system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119285196A (en) * | 2024-11-07 | 2025-01-10 | 北京中科领向环保研究院有限公司西安分公司 | A municipal sludge drying system and process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119285196A (en) * | 2024-11-07 | 2025-01-10 | 北京中科领向环保研究院有限公司西安分公司 | A municipal sludge drying system and process |
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