CN113087358A - Energy-efficient sludge drying system - Google Patents
Energy-efficient sludge drying system Download PDFInfo
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- CN113087358A CN113087358A CN202110477416.2A CN202110477416A CN113087358A CN 113087358 A CN113087358 A CN 113087358A CN 202110477416 A CN202110477416 A CN 202110477416A CN 113087358 A CN113087358 A CN 113087358A
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- absorption tower
- heat exchanger
- circulating water
- temperature drying
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements for supplying or controlling air or other gases for drying solid materials or objects
- F26B21/40—Arrangements for supplying or controlling air or other gases for drying solid materials or objects using gases other than air
- F26B21/45—Arrangements for supplying or controlling air or other gases for drying solid materials or objects using gases other than air using steam
- F26B21/452—Arrangements for supplying or controlling air or other gases for drying solid materials or objects using gases other than air using steam characterised by the steam generating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B23/00—Heating arrangements
- F26B23/10—Heating arrangements using tubes or passages containing heated fluids, e.g. acting as radiative elements; Closed-loop systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Combustion & Propulsion (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
本发明涉及资源再利用领域，具体涉及一种高效节能污泥干化系统。其包括依次通过管线顺序连接的高温干化设备，除尘器，吸收塔，换热器，低温干化设备，其中换热器与吸收塔间设置有回路管线，低温干化设备与换热器间设置有回路管线，吸收塔废气出口连接依次连接冷凝器，锅炉；所述的吸收塔，其结构包括上端设置乏汽出口(5)，内部设置有喷淋层(6)，喷淋层(6)下方设置有填料层(7)，填料层(7)下方的一侧设置乏汽进口(8)。该系统不仅能够将高温烘干阶段产生的废热充分利用，还能够利用各种生活废热，例如冬季取暖、楼堂馆所的热水供给等废热循环水，充分的进行废热循环利用，节省各种成本和资源。
The invention relates to the field of resource reuse, in particular to a high-efficiency and energy-saving sludge drying system. It includes a high temperature drying equipment, a dust collector, an absorption tower, a heat exchanger, and a low temperature drying equipment sequentially connected by pipelines, wherein a loop pipeline is arranged between the heat exchanger and the absorption tower, and the low temperature drying equipment and the heat exchanger are arranged. A loop pipeline is provided, and the exhaust gas outlet of the absorption tower is connected to the condenser and the boiler in turn; the structure of the absorption tower includes a spent steam outlet (5) arranged at the upper end, and a spray layer (6) is arranged inside, and the spray layer (6) A packing layer (7) is arranged below the packing layer (7), and a depleted steam inlet (8) is arranged on one side below the packing layer (7). The system can not only make full use of the waste heat generated in the high-temperature drying stage, but also make use of various domestic waste heat, such as waste heat circulating water for heating in winter, hot water supply in buildings and halls, and fully recycle waste heat, saving various costs and resources.
Description
Technical Field
The invention relates to the field of resource recycling, in particular to a high-efficiency energy-saving sludge drying system.
Background
At present, along with the increasing attention of the country to the environment protection work, the treatment of various solid wastes is increasingly standard and strict, the treatment of the water treatment sludge of various sewage treatment plants and fermentation enterprises becomes a difficult point of various cities, compared with the traditional landfill, the prior drying and coupled combustion are more environment-friendly and sustainable development, the prior sludge drying can be divided into high-temperature drying and low-temperature drying from the heat source temperature, the prior high-temperature drying with higher efficiency is steam heating drying, the energy consumption in the drying process is very high, and a lot of waste heat and exhaust steam generated in the process is not easy to recycle due to various corrosive components contained in the waste heat and exhaust steam, so that the waste heat and exhaust steam is directly wasted or the recycling effect is not good, the cost is higher, and the like.
Disclosure of Invention
The invention aims at the problems of the prior art and provides an efficient energy-saving sludge drying system which can fully utilize waste heat generated in a high-temperature drying stage and utilize various domestic waste heat, such as waste heat circulating water for heating in winter, hot water supply in buildings and other places, so that the waste heat can be fully recycled, and various costs and resources can be saved.
The invention relates to a high-efficiency energy-saving sludge drying system which comprises a high-temperature drying device, a dust remover, an absorption tower, a heat exchanger and a low-temperature drying device which are sequentially connected through pipelines, wherein a loop pipeline is arranged between the heat exchanger and the absorption tower, a loop pipeline is arranged between the low-temperature drying device and the heat exchanger, and a waste gas outlet of the absorption tower is sequentially connected with a condenser and a boiler. Wherein, the pipeline between the absorption tower and the heat exchanger is provided with first-stage circulating water, the pipeline between the heat exchanger and the low-temperature drying equipment is provided with second-stage circulating water, and the heat exchanger separates the first-stage circulating water from the second-stage circulating water, thereby avoiding the influence of various components on the circulating water in the low-temperature drying process.
The absorption tower structurally comprises an exhaust steam outlet arranged at the upper end, a spraying layer arranged inside the absorption tower, a packing layer arranged below the spraying layer, and an exhaust steam inlet arranged on one side below the packing layer. The exhaust steam enters the absorption tower and then passes through the spraying layer, and the heat in the exhaust steam is taken away by the outlet water of the spraying layer and is used as primary circulating water for heat exchange. The exhaust steam continuously passes through the exhaust steam outlet after passing through the spraying layer, is condensed and dehydrated by the condenser and enters the boiler to be burnt, the exhaust steam waste heat is utilized in the process, the waste gas in the exhaust steam can be introduced into the boiler to be completely burnt, the waste gas waste heat is completely utilized, and the method is environment-friendly and efficient.
Preferably, the absorption tower is also provided with a water replenishing regulating valve, so that part of primary circulating water lost at the absorption tower can be replenished, and various kinds of hot wastewater can be utilized.
Preferably, a first circulating water pump is arranged between the absorption tower and the heat exchanger and provides power for first-stage circulating water in the first circulating water pump; and a first circulating water pump is arranged between the heat exchanger and the low-temperature drying equipment and supplies power to the secondary circulating water in the first circulating water pump. The first-stage circulating water and the second-stage circulating water can be effectively circulated through the circulating water pump.
Preferably, a temperature device and a pH meter are further arranged between the heat exchanger and the low-temperature drying equipment, an alkali adding adjusting valve is further arranged on a loop pipeline of the low-temperature drying equipment and the heat exchanger, the low-temperature dried sludge is generally high in acidity, the secondary circulating water is high in acidity after being circulated for multiple times, damage is caused to the pipeline and the equipment, acid and alkali adjustment can be properly carried out through the alkali adding adjusting valve, and corrosion of the secondary circulating water to the pipeline and the equipment is reduced.
Preferably, the absorption tower is provided with a water retaining brim above the exhaust steam inlet, and the side wall below the exhaust steam inlet is provided with an overflow port, so that circulating water can be prevented from spraying or accumulating too much reverse flow to enter the exhaust steam inlet.
Preferably, the first circulating water pump is a variable frequency pump, and the flow of circulating water can be adjusted according to the water quantity, heat and the like.
In addition, a conductivity meter and the like can be arranged between the heat exchanger and the low-temperature drying equipment, so that the problems of leakage points and the like in pipelines can be detected. The water replenishing regulating valve, the circulating water pump I, the alkali adding regulating valve, the variable frequency pump, the conductivity meter and the like can be controlled by a DCS or PLC system, and the accuracy and the intelligence can be realized.
In the working process of the invention, the exhaust steam generated by drying the sludge by the high-temperature steam in the high-temperature drying equipment enters the dust remover for dust removal through a pipeline, then enters the absorption tower, and after the heat is absorbed by the primary circulating water, the primary circulating water containing heat enters the heat exchanger for heat exchange to the secondary circulating water, and the primary circulating water circulates back to the spraying layer of the absorption tower at the moment and absorbs the heat by spraying the exhaust steam containing heat. And pumping the obtained hot secondary circulating water to a low-temperature drying device to dry the sludge at a low temperature, and then returning the secondary circulating water to the heat exchanger to continuously exchange heat. The exhaust steam enters a condenser for condensation and dehydration after heat exchange in the absorption tower and then enters a boiler for combustion. When the water quantity of the primary circulating water is insufficient or the heat exchange of the exhaust steam is insufficient, the water quantity or heat can be supplemented through the water supplementing adjusting valve.
The invention has the beneficial effects that:
(1) performing system optimization on a drying system, and coupling high-temperature drying and low-temperature drying for use;
(2) the heat contained in the high-temperature drying waste gas is effectively recovered for low-temperature drying;
(3) the corrosion problem in waste gas recovery is effectively solved with low investment;
(4) potential safety hazards caused by leakage, which are possibly caused by media or processes of low-grade heat energy users, are avoided.
Drawings
FIG. 1 is a schematic structural view of an efficient energy-saving sludge drying system according to the present invention;
FIG. 2 is a schematic structural diagram of an absorption tower in the efficient energy-saving sludge drying system of the present invention;
wherein, 1 is a water-replenishing regulating valve, 2 is a circulating water pump I, 3 is a circulating water pump II, 4 is an alkalifying regulating valve, 5 is an exhaust steam outlet, 6 is a spraying layer, 7 is a packing layer, 8 is an exhaust steam inlet, 9 is a water retaining brim, 10 is a variable frequency pump, and 11 is an overflow port.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but it should not be construed that the scope of the above subject matter is limited to the following examples. All the technologies realized based on the above contents of the present invention belong to the scope of the present invention. Except as otherwise noted, the following examples were carried out using conventional techniques.
As shown in fig. 1 and 2, a high-efficiency energy-saving sludge drying system comprises a high-temperature drying device, a dust remover, an absorption tower, a heat exchanger and a low-temperature drying device which are sequentially connected through pipelines, wherein a loop pipeline is arranged between the heat exchanger and the absorption tower, a loop pipeline is arranged between the low-temperature drying device and the heat exchanger, and a waste gas outlet of the absorption tower is sequentially connected with a condenser and a boiler.
The absorption tower structurally comprises an exhaust steam outlet 5 arranged at the upper end, a spraying layer 6 arranged inside the absorption tower, a packing layer 7 arranged below the spraying layer 6, and an exhaust steam inlet 8 arranged on one side below the packing layer 7. The exhaust steam enters the absorption tower and then passes through the spraying layer 6, and the heat in the exhaust steam is taken away by the outlet water of the spraying layer 6 and is used as primary circulating water for heat exchange. The exhaust steam continuously passes through the exhaust steam outlet 5 after passing through the spraying layer 6, is condensed and dehydrated by the condenser and enters the boiler to be burnt, the exhaust steam waste heat is utilized in the process, the waste gas in the exhaust steam can be introduced into the boiler to be completely burnt, the waste gas waste heat is completely recycled, and the method is environment-friendly and efficient.
The absorption tower is also provided with a water replenishing regulating valve 1, which not only replenishes part of primary circulating water lost at the absorption tower, but also can utilize various kinds of hot waste water.
A first circulating water pump 2 is arranged between the absorption tower and the heat exchanger and supplies power to first-stage circulating water in the first circulating water pump; a first circulating water pump 3 is arranged between the heat exchanger and the low-temperature drying equipment and supplies power to the secondary circulating water in the first circulating water pump. The first-stage circulating water and the second-stage circulating water can be effectively circulated through the circulating water pump.
A temperature device and a pH meter are further arranged between the heat exchanger and the low-temperature drying equipment, an alkali adding adjusting valve 4 is further arranged on a loop pipeline of the low-temperature drying equipment and the heat exchanger, the low-temperature dried sludge is generally strong in acidity, secondary circulating water can be strong in acidity after being circulated for multiple times, damage is caused to the pipeline and the equipment, acid-base adjustment can be properly carried out through the alkali adding adjusting valve 4, and corrosion of the secondary circulating water to the pipeline and the equipment is reduced.
The absorption tower is provided with a water retaining brim 9 above the exhaust steam inlet 8, and an overflow port 11 is arranged on the side wall below the exhaust steam inlet 8, so that circulating water can be prevented from spraying or accumulating too much reverse flow to enter the exhaust steam inlet 8.
The first circulating water pump 2 is a variable frequency pump 10 and can adjust the flow of circulating water according to water quantity, heat and the like.
And a conductivity meter can be arranged between the heat exchanger and the low-temperature drying equipment, so that the problems of leakage points and the like in pipelines can be detected.
The water replenishing regulating valve 1, the circulating water pump I2, the circulating water pump I3, the alkali adding regulating valve 4, the variable frequency pump 10, the conductivity meter and the like are controlled through a PLC system, and the water replenishing regulating valve can be more accurate and more intelligent.
Claims (8)
1. A high-efficiency energy-saving sludge drying system is characterized by comprising a high-temperature drying device, a dust remover, an absorption tower, a heat exchanger and a low-temperature drying device which are sequentially connected through pipelines, wherein a loop pipeline is arranged between the heat exchanger and the absorption tower, a loop pipeline is arranged between the low-temperature drying device and the heat exchanger, and a waste gas outlet of the absorption tower is sequentially connected with a condenser and a boiler;
the absorption tower structurally comprises an exhaust steam outlet (5) arranged at the upper end, a spraying layer (6) arranged inside the absorption tower, a packing layer (7) arranged below the spraying layer (6), and an exhaust steam inlet (8) arranged on one side below the packing layer (7).
2. The high-efficiency energy-saving sludge drying system according to claim 1, wherein the absorption tower is further provided with a water-replenishing regulating valve (1).
3. The high-efficiency energy-saving sludge drying system according to claim 1, wherein a first circulating water pump (2) is arranged between the absorption tower and the heat exchanger, and a first circulating water pump (3) is arranged between the heat exchanger and the low-temperature drying equipment.
4. The high-efficiency energy-saving sludge drying system according to claim 1, wherein a temperature instrument and a pH meter are further arranged between the heat exchanger and the low-temperature drying device, and an alkali-adding regulating valve (4) is further arranged on a loop pipeline of the low-temperature drying device and the heat exchanger.
5. The high-efficiency energy-saving sludge drying system as claimed in claim 1, wherein the absorption tower is provided with a water retaining eave (9) above the exhaust steam inlet (8), and an overflow port (11) is arranged on the side wall below the exhaust steam inlet (8).
6. The high-efficiency energy-saving sludge drying system according to claim 1, wherein the first circulating water pump (2) is a variable frequency pump (10).
7. The efficient energy-saving sludge drying system as claimed in claim 1, wherein a conductivity meter is arranged between the heat exchanger and the low temperature drying device.
8. The high-efficiency energy-saving sludge drying system according to claim 1, wherein the system is a water supplementing regulating valve (1), a circulating water pump (2), a circulating water pump (3), an alkali adding regulating valve (4), a variable frequency pump (10), and the conductivity meter is controlled by a DCS or PLC system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110477416.2A CN113087358A (en) | 2021-04-29 | 2021-04-29 | Energy-efficient sludge drying system |
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| CN202110477416.2A CN113087358A (en) | 2021-04-29 | 2021-04-29 | Energy-efficient sludge drying system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114230122A (en) * | 2021-12-15 | 2022-03-25 | 山东尚科环境工程有限公司 | High-temperature and low-temperature drying comprehensive treatment method for papermaking sludge |
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