CN109133572B - Purification and heat recovery system and method for sludge drying waste gas - Google Patents

Purification and heat recovery system and method for sludge drying waste gas Download PDF

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Publication number
CN109133572B
CN109133572B CN201710452125.1A CN201710452125A CN109133572B CN 109133572 B CN109133572 B CN 109133572B CN 201710452125 A CN201710452125 A CN 201710452125A CN 109133572 B CN109133572 B CN 109133572B
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heat exchange
heat
liquid
heat exchanger
exchange medium
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CN109133572A (en
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谭玮
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Guangzhou Zhengsheng Technology Co ltd
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Guangzhou Zhengsheng Technology Co ltd
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D47/00Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/02Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10Greenhouse 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treatment Of Sludge (AREA)
  • Drying Of Solid Materials (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention discloses a purification and heat recovery system for sludge-dried exhaust gas, which comprises: a first heat exchange flow path including a first heat exchanger in which a first heat exchange medium circulates and a second heat exchanger in which a process gas for supply to the sludge drying apparatus is heated; a second purification and heat exchange flow path including a heat exchange tank containing a second liquid heat exchange medium, into which the exhaust gas discharged from the sludge drying apparatus is inputted such that the exhaust gas is washed by the second liquid heat exchange medium and transfers heat to the second liquid heat exchange medium to be cooled, wherein the second liquid heat exchange medium transfers heat to the first heat exchange medium in the second heat exchanger; and a third turbid liquid separation flow path including a turbid liquid separation tank, the turbid liquid inlet of the turbid liquid separation tank receiving turbid liquid discharged from the turbid liquid outlet of the heat exchange tank, separating the turbid liquid, and returning obtained clear liquid to the heat exchange tank.

Description

Purification and heat recovery system and method for sludge drying waste gas
Technical Field
The present invention relates to a purification and heat recovery system and method, and more particularly to a purification and heat recovery system and method for sludge-dried exhaust gas.
Background
Sludge drying refers to a process of reducing the water content of sludge through the effects of infiltration or evaporation and the like. At present, sludge drying treatment is an effective sludge treatment method. The current drying treatment generally adopts direct drying, a large amount of waste gas is released in the sludge heat drying process, the components are complex and various, and the sludge heat drying treatment is a mixture of various organic and inorganic gases, for example, the direct emission can cause serious secondary pollution to the surrounding environment and serious harm to the human living environment. In addition, in the sludge drying treatment, the temperature of the exhaust gas discharged is also relatively high. Thus, directly discharging such exhaust gas results in a loss of a large amount of heat.
For the waste gas generated by the sludge drying treatment, some treatment methods have been developed, such as a biological filtration method, or the use of a waste gas absorption tower, a dust remover, etc. The exhaust gas is discharged after being treated, and the heat carried by the exhaust gas is not recovered and reused, so that the drying energy consumption cost is increased.
Some ways of heat recovery of exhaust gases have also been developed in the prior art, such as wheel heat exchange, plate-fin heat exchange, heat pipe heat exchange, intermediate medium heat exchange, and the like. For example, in chinese patent publication CN101618931a, it is disclosed that a carrier gas outlet of a sludge dryer is introduced into an evaporator in a heat pump system to provide heat for endothermic evaporation in the evaporator, and then exhaust gas is discharged from the evaporator. Similarly, in another chinese patent publication CN101774743a, it is disclosed that heat recovery is performed on the steam heat in the tail gas generated by sludge drying by a latent heat recovery heat pump. However, these heat recovery methods are relatively inefficient and sludge impurities contained in the exhaust gas may clog the heat recovery equipment and cause corrosion.
The above-mentioned treatment methods of the exhaust gas generated in the sludge drying are difficult to realize both the effective exhaust gas treatment and the heat recovery functions.
Accordingly, there is a need for further improvements in exhaust gas treatment.
Disclosure of Invention
In order to achieve the above object, the present invention provides a purification and heat recovery system for sludge-dried exhaust gas, comprising: a first heat exchange flow path including a first heat exchanger in which a first heat exchange medium circulates and a second heat exchanger in which a process gas for supply to the sludge drying apparatus is heated; a second purification and heat exchange flow path including a heat exchange tank containing a second liquid heat exchange medium, into which the exhaust gas discharged from the sludge drying apparatus is inputted such that the exhaust gas is washed by the second liquid heat exchange medium and transfers heat to the second liquid heat exchange medium to be cooled, wherein the second liquid heat exchange medium transfers heat to the first heat exchange medium in a second heat exchanger; and a third turbid liquid separation flow path including a turbid liquid separation tank, the turbid liquid inlet of the turbid liquid separation tank receiving turbid liquid discharged from the turbid liquid outlet of the heat exchange tank, separating the turbid liquid, and returning obtained clear liquid to the heat exchange tank.
The waste gas discharged from the sludge drying device is input into the heat exchange box, is not only washed by the second liquid heat exchange medium in the heat exchange box, but also exchanges heat with the second liquid heat exchange medium in the heat exchange box, so that heat can be transferred into the second liquid heat exchange medium to achieve the aim of cooling. The second liquid heat exchange medium is heated, the heated second liquid heat exchange medium exchanges heat with the first heat exchange medium in the second heat exchanger, heat is transferred to the first heat exchange medium, and the first heat exchange medium transfers the heat to the treatment gas to be supplied to the sludge drying device, so that the heat recovery efficiency is improved, and a better energy-saving effect is realized. The heat can be fully recovered and the heat loss is reduced through the heat conversion of the waste gas, the second liquid heat exchange medium and the first heat exchange medium. Meanwhile, the waste gas is also subjected to full cleaning by the liquid, so that sludge impurities in the waste gas are removed.
Meanwhile, in the third turbid liquid separation flow path, the turbid liquid separation tank can receive turbid liquid discharged from the heat exchange tank and separate the turbid liquid into clear liquid and sludge by gravity, and the clear liquid is returned to the heat exchange tank. This further increases the heat recovery efficiency, since the supernatant still carries a part of the heat.
The invention relates to a purification and heat recovery system and a method for sludge-dried waste gas, wherein air from the external environment reaches a first heat exchanger through a compressor. The first heat exchanger heats the air, and the heated air then flows along a path to the ventilation device. The hot air pressurized by the ventilation device enters the sludge drying device along the path. The hot air dries the sludge in the sludge drying device to form tail gas or waste gas, and the waste gas flows to the gas distribution device along a path. The waste gas is uniformly discharged into the second liquid heat exchange medium in the heat exchange box by the gas distribution device through the waste gas inlet pipe so as to clean the waste gas by using the second liquid heat exchange medium and transfer the heat in the waste gas to the second liquid heat exchange medium, thereby realizing gas-liquid heat exchange and recycling the heat of the waste gas. The gas collecting device collects the exhaust gas discharged from the heat exchange box and transfers heat to the first heat exchange medium in the third heat exchanger by utilizing the exhaust gas, so that part of heat carried by the exhaust gas can be further recovered. The purified and cooled exhaust gas rises to form exhaust gas that is discharged to the environment or other treatment devices.
At the same time, the first heat exchange medium releases heat to the air through the first heat exchanger, so that the heat exchange process between the first heat exchange medium and the gas in the first heat exchanger is realized, and the heat exchange medium passes through the throttle valve to obtain the second heat exchanger. The second liquid heat exchange medium in the heat exchange box absorbs heat in the waste gas to cause temperature rise, and the first heat exchange medium absorbs heat in the second liquid heat exchange medium in the second heat exchanger, so that the temperature of the second liquid heat exchange medium is reduced, and further, another heat exchange process between the second liquid heat exchange medium and the first heat exchange medium in the second heat exchanger is realized. The heat of the waste gas is converted into the second liquid heat exchange medium, and then the second liquid heat exchange medium transfers the heat energy to the second heat exchanger, so that the multi-phase change heat energy conversion is realized, and the heat energy transfer efficiency is greatly improved; the exhaust gas discharged from the heat exchange box is collected through the gas collecting device, and heat is transferred to the first heat exchange medium in the third heat exchanger by utilizing the exhaust gas, so that the heat in the exhaust gas is further recovered; through the heat energy conversion of the waste gas, the second liquid heat exchange medium and the first heat exchange medium, heat can be fully recovered, heat loss is reduced, and therefore energy consumption is reduced. From the above flow, the invention has smart flow, can quickly and effectively realize heat recovery by a unique heat exchange mode, and ensures that the heating energy efficiency ratio COP reaches 3.0-8.0, thereby improving the drying speed and having good sludge drying effect. In addition, the invention cleans the waste gas by using the second liquid heat exchange medium, so that the sludge impurities in the waste gas are effectively washed, the service life of equipment is better ensured, the waste gas is prevented from blocking or corroding the equipment in the heat exchange process, and the heat recovery efficiency of the waste gas is improved.
The turbid liquid in the heat exchange box is recovered through the turbid liquid separation device, and the turbid liquid still carries a part of heat, so that the liquid separated by the turbid liquid flows into the heat exchange box again, thereby realizing the recycling of the liquid, and recycling a part of heat carried by the liquid, and further improving the heat recovery efficiency.
As a preferred embodiment of the invention, the purification and heat recovery system further comprises a fourth compressed gas flow path comprising a compressed gas inlet for introducing compressed gas, a gas pipe and a control valve at the compressed gas inlet, wherein the compressed gas inlet is arranged close to the bottom of the heat exchange tank and the gas pipe is arranged in the heat exchange tank close to the bottom of the heat exchange tank and has a plurality of gas outlet holes, such that compressed gas is injected into the second liquid heat exchange medium via the plurality of gas outlet holes. When needed, the compressed gas is sprayed into the second liquid heat exchange medium, so that sludge impurities deposited at the bottom of the heat exchange box can be stirred, and the sludge impurities can be discharged from a turbid liquid outlet.
As another preferred embodiment of the present invention, the first heat exchange flow path further includes a third heat exchanger, wherein the third heat exchanger is disposed outside the heat exchange tank, and the first heat exchange medium exchanges heat with exhaust gas of the heat exchange tank in the third heat exchanger to further cool the exhaust gas, wherein the exhaust gas is collected by a gas collecting device.
Optionally, the second heat exchanger and/or the third heat exchanger may comprise a plurality of heat exchangers.
Preferably, the first heat exchange flow path is constituted by a heat exchange circuit including a compressor that compresses the first heat exchange medium from the second heat exchanger and/or the third heat exchanger and discharges the compressed first heat exchange medium to the first heat exchanger, and a throttle valve through which the first heat exchange medium heats the process gas in the first heat exchanger and then flows into the second heat exchanger and/or the third heat exchanger.
Preferably, the process gas flows through the compressor before flowing through the first heat exchanger.
Preferably, the second liquid heat exchange medium is one or more of water, a cleaning liquid or an ionic liquid.
Preferably, the second heat exchanger is placed inside the heat exchange tank. Preferably, the exhaust gas is discharged into the heat exchange tank below the liquid level in the heat exchange tank.
Preferably, the process gas is air.
Preferably, gas distribution means are provided for evenly distributing the exhaust gases into the heat exchange tank.
Preferably, the treatment gas is fed from the first heat exchanger to a sludge drying device by a ventilation device.
Preferably, in the heat exchange tank, the exhaust gas also transfers heat directly to the first heat exchange medium in the second heat exchanger.
Preferably, the second heat exchanger is arranged in series upstream or downstream of the third heat exchanger.
Preferably, the second heat exchanger is arranged in parallel with the third heat exchanger.
In order to achieve the above object, the present invention also provides a method for purifying and heat recovering exhaust gas for sludge drying, comprising: providing a first heat exchange flow path comprising a first heat exchanger and a second heat exchanger, a first heat exchange medium circulating in the first heat exchange flow path and heating a process gas in the first heat exchanger for supply to a sludge drying device; providing a second purification and heat exchange flow path comprising a heat exchange tank containing a second liquid heat exchange medium, and arranging the second heat exchanger such that the second liquid heat exchange medium transfers heat to the first heat exchange medium in the second heat exchanger; providing a third turbid liquid separation flow path including a turbid liquid separation tank having a turbid liquid inlet receiving turbid liquid discharged from a turbid liquid outlet of the heat exchange tank, separating the turbid liquid, and returning obtained clear liquid to the heat exchange tank; filling the heat exchange tank with the second liquid heat exchange medium; activating the first heat exchange flow path and the second purification and heat exchange flow path so that process gas is heated in the first heat exchanger and then fed to a sludge drying device, and exhaust gas discharged from the sludge drying device is fed into the heat exchange tank so that the exhaust gas is washed by the second liquid heat exchange medium and heat is transferred to the second liquid heat exchange medium to be cooled; and activating a third turbid liquid separation flow path to separate turbid liquid discharged from the heat exchange tank in the turbid liquid separation tank and return obtained clear liquid to the heat exchange tank when necessary.
As a preferred embodiment of the invention, the method further comprises providing a fourth compressed gas flow path comprising a compressed gas inlet for introducing compressed gas, a gas pipe and a control valve at the compressed gas inlet, wherein the compressed gas inlet is arranged close to the bottom of the heat exchange tank and the gas pipe is arranged in the heat exchange tank close to the bottom of the heat exchange tank and has a plurality of gas outlet holes, such that compressed gas is injected into the second liquid heat exchange medium via the plurality of gas outlet holes.
As another preferred embodiment of the present invention, in the method, the first heat exchange flow path further includes a third heat exchanger, wherein the third heat exchanger is connected in series or parallel with the second heat exchanger, is disposed outside the heat exchange tank, and the first heat exchange medium exchanges heat with the exhaust gas discharged from the heat exchange tank in the third heat exchanger to further cool the exhaust gas, wherein the exhaust gas is collected by a gas collecting device.
Preferably, the method further comprises providing a compressor and a throttle valve in the first heat exchange flow path, the compressor compressing the first heat exchange medium from the second and/or third heat exchanger and discharging the compressed first heat exchange medium to the first heat exchanger, the first heat exchange medium transferring heat to the process gas in the first heat exchanger and then flowing into the second and/or third heat exchanger via the throttle valve.
The details, features and advantages of the invention will be explained in further detail below with reference to the drawings.
Drawings
Fig. 1 is a schematic view of a first preferred embodiment of the purification and heat recovery system for sludge-dried exhaust gas according to the present invention.
Fig. 2 is a schematic view of a second preferred embodiment of the purification and heat recovery system for sludge-dried exhaust gas according to the present invention.
Fig. 3 is a schematic view of a third preferred embodiment of the purification and heat recovery system for sludge-dried exhaust gas according to the present invention.
Fig. 4 is a schematic view of a fourth preferred embodiment of the purification and heat recovery system for sludge-dried exhaust gas according to the present invention.
Fig. 5 is a schematic view of a fifth preferred embodiment of the purification and heat recovery system for sludge-dried exhaust gas according to the present invention.
Reference numerals:
1. sludge drying device
2. First heat exchange flow path
21. Compressor with a compressor body having a rotor with a rotor shaft
22. First heat exchanger
23. Throttle valve
24. Second heat exchanger
25. Third heat exchanger
3. Second purification and heat exchange flow path
31. Heat exchange box
311. Clear liquid inlet
312. First control valve
313. Waste liquid outlet
314. Second control valve
315. Turbid liquid outlet
316. Compressed gas inlet
317. Air pipe
318. Third control valve
32. Gas distribution device
321. Air inlet pipeline
322. Air outlet
323. Second liquid heat exchange medium
4. Ventilating device
5. Process gas
6. Gas collecting device
7. Third turbid liquid separation channel
71. Turbid liquid separating box
701. Turbid liquid inlet
702. Liquid outlet
703. Fluid infusion port
704. Sludge outlet
705. Fourth control valve
706. Fifth control valve
72. And (3) a pump.
Detailed Description
As shown in fig. 1 to 5, the purification and heat recovery system of exhaust gas for sludge drying of the present invention includes a plurality of flow paths: a first heat exchange channel 2, a second purification and heat exchange channel 3, and a third turbid liquid separation channel 7. Optionally, the system may further comprise a fourth compressed gas flow path 8.
The first heat exchange flow path 2 provides a hot process gas, such as hot air, to the sludge drying device 1. Air from the external environment is introduced into the first heat exchange flow path 2 and heated therein. The heated air is fed into the sludge drying apparatus 1 by the ventilation apparatus 4 and used as a treatment gas. The sludge is dried by the treatment gas heated in the sludge drying apparatus 1, thereby generating tail gas or exhaust gas. The exhaust gas discharged from the sludge drying apparatus 1 is inputted into the second purifying and exchanging flow path 3 to be purified and cooled.
In a preferred embodiment, the first heat exchange flow path 2 is constituted by a heat exchange circuit comprising a compressor 21, a first heat exchanger 22, a throttle valve 23, a second heat exchanger 24. Alternatively, the heat exchange circuit may also comprise a third heat exchanger 25. A first heat exchange medium circulates in the heat exchange circuit. The compressor 21 compresses the first heat exchange medium in a gaseous state, and discharges the compressed high-temperature and high-pressure first heat exchange medium to the first heat exchanger 22. The first heat exchange medium is condensed in the first heat exchanger 22 by the process gas 5 (for example, air from the outside) flowing through the first heat exchanger 22, and becomes a liquid state, and the process gas is thereby heated. Here, the first heat exchanger 22 corresponds to a condenser. The condensed first heat exchange medium passes through the throttle valve 23 and enters the second heat exchanger 24 and/or the third heat exchanger 25 in a liquid form with low temperature and low pressure. In the second heat exchanger 24 and/or the third heat exchanger 25, the first heat exchange medium absorbs heat from the second heat exchange flow path 3 to evaporate. Thus, the second heat exchanger 24 and/or the third heat exchanger 25 correspond to an evaporator. The evaporated first heat exchange medium is sucked by the compressor 21 for a new compression cycle. The first heat exchange medium may be, for example, R134a, R407c, R410a, etc.
The second heat exchanger 24 is placed inside the heat exchange tank 31, and the third heat exchanger 25 is placed outside the heat exchange tank 31. The exhaust gas collected from the heat exchange tank 31 is used to transfer heat to the first heat exchange medium flowing in the third heat exchanger 25.
Preferably, the process gas flows through the compressor 21 before flowing through the first heat exchanger 22, helping to cool the compressor 21 and thus being preheated, thereby improving the heat recovery efficiency.
The process gas heated in the first heat exchanger 22 is then fed to the sludge drying device 1 via a ventilation device 4, preferably a blower and/or a fan. The exhaust gas discharged from the sludge drying apparatus 1, i.e., the used process gas, is introduced into the second purifying and heat exchanging flow path 3.
The second purifying and heat exchanging flow path 3 includes a heat exchanging tank 31 accommodating a second liquid heat exchanging medium 323. The exhaust gas leaves the sludge drying apparatus 1 and is discharged into the heat exchange tank 31 through the intake line 321. In the heat exchange tank 31, the exhaust gas is subjected to a sufficient cleaning by the second liquid heat exchange medium 323. Meanwhile, the exhaust gas is directly heat-exchanged not only with the second liquid heat exchange medium but also with the first heat exchange medium in the second heat exchanger 24.
As shown in fig. 1, in a preferred embodiment, the heat exchange tank 31 includes a clear liquid inlet 311 for introducing the second liquid heat exchange medium 323, a waste liquid outlet 313 for discharging waste liquid, and a turbid liquid outlet 315 for discharging turbid liquid, wherein the clear liquid inlet 311 and the waste liquid outlet 313 are disposed near the bottom of the heat exchange tank 31, respectively, and the turbid liquid outlet 315 is disposed near the upper portion of the heat exchange tank 31. In addition, a second control valve 314 is provided at the waste liquid outlet 313, which allows cleaning of the heat exchange tank 31 and replenishment or replacement of the second liquid heat exchange medium, e.g. waste liquid and/or turbid liquid can be drained from the heat exchange tank 31 (opening the second control valve 314) and a new (clean) second liquid heat exchange medium is injected into the heat exchange tank 31 through the clear liquid inlet 311, if desired.
Preferably, the heat exchange tank 31 is further provided with gas distribution means 32 in gas communication with the heat exchange tank 31 and the sludge drying apparatus 1, respectively, via pipes. In particular, the inlet line 321 connecting the gas distribution device 32 and the heat exchange tank 31 is inserted below the level of the second liquid heat exchange medium in the heat exchange tank 31, the inlet line 321 being inserted to a depth sufficient to ensure adequate heat exchange between the gas and the liquid.
The exhaust gas from the sludge drying device 11 is collected in the gas distribution device 32 and discharged via the inlet line 321 into the second liquid heat exchange medium in the heat exchange tank 31. In this embodiment, the second liquid heat exchange medium is water. The second liquid heat exchange medium is not limited to water and other suitable liquids may be used, such as one or more of a cleaning liquid and an ionic liquid.
The exhaust gases are cleaned in the heat exchange tank 31 and transfer heat to the second liquid heat exchange medium and are thus cooled. Thereby realizing purification of exhaust gas and recovery of heat. After the temperature of the exhaust gas is reduced, the exhaust gas automatically rises above the liquid level of the second liquid heat exchange medium in the second liquid heat exchange medium, and is further collected by the gas collecting device 6.
The second liquid heat exchange medium, which obtains heat from the exhaust gas, transfers heat again to the first heat exchange medium flowing in the second heat exchanger 24 via the second heat exchanger 24 to evaporate the first heat exchange medium.
The third turbid liquid separation flow path 7 includes a turbid liquid separation tank 71. The turbid liquid separation tank 71 is provided with a turbid liquid inlet 701, a liquid outlet 702, a liquid replenishing port 703 and a sludge outlet 704, respectively. The turbid liquid inlet 701, the liquid outlet 702 and the liquid replenishing opening 703 are both provided at the upper part of the turbid liquid separation tank 71, and the sludge outlet 704 is provided at the bottom part of the turbid liquid separation tank 71. A fourth control valve 705 is provided at the fluid refill port 703 and a fifth control valve 706 is provided at the sludge outlet 704. The turbid liquid inlet 701 is in fluid communication with the turbid liquid outlet 315 of the heat exchange box 31 to receive turbid liquid discharged from the heat exchange box 31. The drain port 702 is in fluid communication with the supernatant inlet 311 of the heat exchange tank 31 to return the supernatant (sludge-removed liquid) separated in the turbid liquid separation tank 71 to the heat exchange tank 31. The liquid replenishing port 703 is used to inject new liquid (i.e., the second liquid heat exchange medium) into the turbid liquid separation tank 71.
Optionally, the third turbid liquid separation flow path 7 may further comprise a pump 72 to pump the clear liquid from the turbid liquid separation tank 71 into the heat exchange tank 31.
Optionally, an additional heat exchanger (not shown) may be provided between the turbid liquid outlet 315 of the heat exchange box 31 and the turbid liquid inlet 701 of the turbid liquid separation box 71. The first heat exchange medium flows through the additional heat exchanger so as to transfer heat in the turbid liquid flowing out of the heat exchange box 31 to the first heat exchange medium, thereby further improving heat recovery efficiency.
The fourth compressed gas flow path 8 includes a compressed gas inlet 316 for introducing compressed gas, a gas pipe 317, and a third control valve 318 provided at the compressed gas inlet 316, wherein the gas pipe 317 is disposed inside the heat exchange tank 31 and near the bottom of the heat exchange tank 31. The gas pipe has a plurality of gas discharge holes such that compressed gas is injected into the second liquid heat exchange medium via the plurality of gas discharge holes. When needed, the third control valve 318 is opened to allow compressed gas to be injected into the second liquid heat exchange medium, so that sludge impurities deposited at the bottom of the heat exchange tank can be stirred, and the sludge impurities can be discharged from the turbid liquid outlet 315.
Fig. 1 shows a first preferred embodiment of the purification and heat recovery system for sludge-dried exhaust gases according to the invention.
In this embodiment, the purification and heat recovery system of exhaust gas for sludge drying includes a first heat exchange flow path 2, a second purification and heat exchange flow path 3, and a third turbid liquid separation flow path 7.
The first heat exchange flow path 2 includes a compressor 21, a first heat exchanger 22, a throttle valve 23, and a second heat exchanger 24. A first heat exchange medium circulates in the heat exchange circuit. Wherein the second heat exchanger 24 is placed in a heat exchange tank 31 in the second purification and heat exchange flow path 3. The compressor 21 compresses the first heat exchange medium and sends it to the first heat exchanger 22, where the first heat exchange medium releases heat to the outside (i.e., heats the process gas), and then adjusts the flow rate through the throttle valve 23 to the second heat exchanger 24. In the second heat exchanger 24, the first heat exchange medium is evaporated into a gas by absorbing heat from the second liquid heat exchange medium, and then returned to the compressor 21.
The process gas flows through the compressor 21 before flowing through the first heat exchanger 22, helping to cool the compressor 21 and thus being preheated. The preheated process gas then enters the first heat exchanger 22 to be further heated. The heated process gas is fed into the sludge drying apparatus 1 via the ventilation apparatus 4.
Optionally, a plurality of second heat exchangers 24 may be provided in the heat exchange tank 31 as required. The plurality of second heat exchangers 24 may be arranged in series or in parallel to increase the efficiency of heat transfer from the second liquid heat exchange medium 323 to the first heat exchange medium.
In the second purifying and heat exchanging flow path 3, the heat exchanging box 31 is provided with a gas distributing means 32 for uniformly discharging the exhaust gas from the sludge drying means into the second liquid heat exchanging medium inside the heat exchanging box 31. The exhaust gases are subjected to a cleaning by the second liquid heat exchange medium in the heat exchange tank 31 and transfer heat to the second liquid heat exchange medium. At the same time, the exhaust gas also transfers heat directly to the first heat exchange medium in the second heat exchanger 24. The cleaned and cooled exhaust gas rises above the liquid level in the heat exchange box 31 to form an exhaust gas 322, which is directly discharged.
When the sludge impurity is excessively accumulated in the bottom of the heat exchange tank 31 and the heat exchange efficiency of the second heat exchanger 24 is affected, the pump 72 may be turned off, the injection of the fresh liquid or the clear liquid into the heat exchange tank 31 may be stopped, and the second control valve 314 may be opened to discharge the liquid from the bottom of the heat exchange tank 31 through the waste liquid outlet 313.
When the liquid level in the heat exchange tank 31 exceeds the turbid liquid outlet 315, the second liquid heat exchange medium (referred to herein as turbid liquid) flows from the turbid liquid outlet 315 to the turbid liquid inlet 701 of the turbid liquid separation tank 71 of the third turbid liquid separation flow path 7. The turbid liquid is stratified by gravity in the turbid liquid separation tank 71, sludge impurities are precipitated at the bottom of the turbid liquid separation tank 71, and clear liquid is formed at the upper portion of the turbid liquid separation tank 71. The clear liquid then exits the turbid liquid separation tank 71 from the drain 702 and is pumped by pump 72 into the heat exchange tank 31 to reuse the second liquid heat exchange medium and to recover part of the heat it carries.
When the liquid level in the turbid liquid separation tank 71 is lower than a predetermined liquid level, the fourth control valve 705 is opened to replenish the supernatant liquid (i.e., the new second liquid heat exchange medium).
When the purification and heat recovery system described above is put into use, the process gas is typically taken from the air of the external environment, generally using the following operating steps.
First, the pump 72 is turned on, and a second liquid heat exchange medium, such as water, is injected into the heat exchange tank 31 from the clear liquid inlet 311. Normally, the second liquid heat exchange medium reaches a predetermined liquid level in the heat exchange tank 31. The pump 72 is then turned off.
The first heat exchange flow path 2 and the second heat exchange flow path 3 are then activated.
Air from the external environment reaches the first heat exchanger 22 via the compressor 21. The first heat exchanger 22 heats the air, which is then routed to the ventilation device 4. The hot air pressurized by the ventilation device 4 enters the sludge drying device 1 along a path. The hot air dries the sludge in the sludge drying device 1 to form exhaust gas or waste gas, which flows along a path to the gas distribution device 32. The exhaust gas is uniformly discharged into the second liquid heat exchange medium in the heat exchange box 31 by the gas distribution device 32 through the exhaust gas inlet pipe so as to clean the exhaust gas by using the second liquid heat exchange medium and transfer the heat in the exhaust gas to the second liquid heat exchange medium, thereby realizing gas-liquid heat exchange and recycling the heat of the exhaust gas. The cleaned and cooled exhaust gas rises to form exhaust gas 322, which is discharged to the environment or other treatment device. At the same time, the first heat exchange medium releases heat to the air through the first heat exchanger 22, and after the heat exchange process between the first heat exchange medium and the gas in the first heat exchanger is realized, the heat exchange medium passes through the throttle valve 23 to the second heat exchanger 24. The second liquid heat exchange medium in the heat exchange tank 31 absorbs heat in the exhaust gas to cause a temperature rise, and the first heat exchange medium absorbs heat in the second liquid heat exchange medium in the second heat exchanger 24, thereby reducing the temperature of the second liquid heat exchange medium and further realizing another heat exchange process between the second liquid heat exchange medium and the first heat exchange medium in the second heat exchanger.
Since the exhaust gas contains sludge impurities, the sludge impurities in the exhaust gas are washed by the second liquid heat exchange medium and remain in the second liquid heat exchange medium during the gas-liquid interaction in the heat exchange tank 31. To keep the second liquid heat exchange medium clean, the pump 722 may be turned on, the second liquid heat exchange medium is introduced into the heat exchange tank 31 from the clear liquid inlet 311 at the bottom of the heat exchange tank 31, and when the liquid level of the second liquid heat exchange medium in the heat exchange tank 31 reaches the turbid liquid outlet 315, the liquid flows out from the turbid liquid outlet 315.
When the accumulation of sludge impurities at the bottom of the heat exchange tank 31 is excessive, affecting the heat exchange efficiency of the second heat exchanger 24, the pump 72 may be turned off, and the second control valve 314 may be opened to discharge the waste liquid from the waste liquid outlet 313 at the bottom of the heat exchange tank 31. After the waste liquid in the heat exchange tank 31 is drained, the reverse operation is performed, i.e., the second control valve 314 is closed, and the pump 72 is turned on to re-inject the clean or new second liquid heat exchange medium into the heat exchange tank 31. Optionally, a first control valve 312 may be provided at the supernatant inlet 311 to better control the amount of the second liquid heat exchange medium entering the heat exchange tank 31.
Fig. 2 shows a second preferred embodiment of the purification and heat recovery system for sludge-dried exhaust gases according to the invention.
The embodiment shown in fig. 2 is different from the embodiment shown in fig. 1 in that a fourth compressed gas flow path 8 is further included, and the rest is the same as the embodiment shown in fig. 1, so that a detailed description thereof will be omitted.
The fourth compressed gas flow path 8 includes a compressed gas inlet 316 for introducing compressed gas, a gas pipe 317, and a third control valve 318 provided at the compressed gas inlet 316, wherein the gas pipe 317 is disposed inside the heat exchange tank 31 and near the bottom of the heat exchange tank 31. The gas pipe has a plurality of gas discharge holes such that compressed gas is injected into the second liquid heat exchange medium via the plurality of gas discharge holes.
As the sludge impurities in the liquid increase, the second liquid heat exchange medium in the heat exchange tank 31 becomes turbid, thereby affecting the cleaning of the later entering exhaust gases. To this end, the third control valve 318 may be opened to allow compressed gas to enter the gas pipe 317 located near the bottom inside the heat exchange tank 31 from the compressed gas inlet. Thereafter, the compressed gas is ejected through a plurality of exhaust holes provided on the gas pipe 317 and agitates the sludge impurities at the bottom of the heat exchange box 31 to facilitate the discharge of the sludge impurities from the turbid liquid outlet 315. The compressed gas leaving the second liquid heat exchange medium is discharged together with the cleaned exhaust gas.
Fig. 3 shows a third preferred embodiment of the purification and heat recovery system for sludge-dried exhaust gases according to the invention.
The embodiment shown in fig. 3 differs from the embodiment shown in fig. 2 in that the first heat exchange flow path 2 further comprises a third heat exchanger 25 and that the third heat exchanger 25 is provided with a gas collecting device 6. The rest of the present embodiment is the same as the embodiment shown in fig. 2, and thus will not be described in detail.
In this embodiment, the third heat exchanger 25 is connected in series with the second heat exchanger 24, the first heat exchange medium from the first heat exchanger 22 flowing via the throttle 23 into the third heat exchanger 25 and then into the second heat exchanger 24. The gas collecting device 6 collects the exhaust gas 322 discharged from the heat exchange tank 31 and uses the exhaust gas to transfer heat to the first heat exchange medium in the third heat exchanger 25. This allows for further recovery of some of the heat carried by the exhaust gas 322. Alternatively, the exhaust gases exiting the heat exchange tank 31 do not need to pass through the gas collecting device, but directly enter the third heat exchanger 25.
The third heat exchanger 25 is located above the heat exchange tank 31. Optionally, a plurality of third heat exchangers 25 may be provided. The plurality of third heat exchangers 25 may be arranged in series or in parallel to improve the heat recovery rate of the exhaust gas. Fig. 4 shows a fourth preferred embodiment of the purification and heat recovery system for sludge-dried exhaust gas according to the present invention.
The embodiment shown in fig. 4 differs from the embodiment shown in fig. 3 in that the first heat exchange medium from the first heat exchanger 22 flows via the throttle valve 23 into the second heat exchanger 24 and then into the third heat exchanger 25. The rest of the present embodiment is the same as the embodiment shown in fig. 3, and thus will not be described in detail.
Fig. 5 shows a fifth preferred embodiment of the purification and heat recovery system for sludge-dried exhaust gas according to the present invention.
The embodiment shown in fig. 5 differs from the embodiments shown in fig. 3 and 4 in that the second heat exchanger 24 and the third heat exchanger 25 are connected in parallel. The remainder of the current embodiment is identical to the embodiment shown in fig. 3 and 4 and will not be described in detail.
In this embodiment, the first heat exchange medium from the first heat exchanger 22 flows via a throttle 23 into the second heat exchanger 24 and the third heat exchanger 25, respectively. The first heat exchange medium absorbs heat in the second heat exchanger 24 not only from the second liquid heat exchange medium, but also directly from the exhaust gases distributed in the second liquid heat exchange medium. In the third heat exchanger 25, the first heat exchange medium absorbs heat from the exhaust gas collected by the gas collecting device 6.
The present invention generally has the following advantageous effects.
(1) The waste gas is firstly washed by the second liquid heat exchange medium in the heat exchange box, so that the waste gas can be prevented from blocking and corroding equipment in the heat exchange process, and the waste gas heat recovery efficiency is improved.
(2) The purification and heat recovery system has good energy-saving effect, realizes high-efficiency heat recovery, and improves the sludge drying efficiency.
(3) Multiple phase change, high heat transfer efficiency and high sludge drying speed. The heat can be fully recovered and the heat loss is reduced through the heat conversion of the waste gas, the second liquid heat exchange medium and the first heat exchange medium.
(4) The process is simple, the drying effect is good, the heat recovery can be realized rapidly and effectively, and the effect and the speed are improved.
(5) The waste gas entering the waste gas purifying and heat recovering system is purified and heat recovered in a closed environment, so that odor is prevented from being generated, secondary pollution is avoided, and the environment is protected.
(6) The turbid liquid in the heat exchange box is recovered by utilizing the turbid liquid separation device, and the turbid liquid still carries a part of heat, so that the liquid separated by the turbid liquid flows into the heat exchange box again, thereby realizing the recycling of the liquid, and recycling a part of heat carried by the liquid, and further improving the heat recovery efficiency.
While the invention has been described with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (19)

1. A purification and heat recovery system for sludge-dried exhaust gas, comprising:
a first heat exchange flow path including a first heat exchanger in which a first heat exchange medium circulates and a second heat exchanger in which a process gas for supply to the sludge drying apparatus is heated;
A second purification and heat exchange flow path including a heat exchange tank containing a second liquid heat exchange medium, into which the exhaust gas discharged from the sludge drying apparatus is inputted such that the exhaust gas is washed by the second liquid heat exchange medium and transfers heat to the second liquid heat exchange medium to be cooled, wherein the second liquid heat exchange medium transfers heat to the first heat exchange medium in the second heat exchanger; and
A third turbid liquid separation flow path including a turbid liquid separation tank having a turbid liquid inlet receiving turbid liquid discharged from a turbid liquid outlet of the heat exchange tank, separating the turbid liquid, and returning obtained clear liquid to the heat exchange tank,
The first heat exchange flow path further includes a third heat exchanger, wherein the third heat exchanger is disposed outside the heat exchange tank, and the first heat exchange medium exchanges heat with the exhaust gas discharged from the heat exchange tank in the third heat exchanger to further cool the exhaust gas,
The second heat exchanger is arranged inside the heat exchange box, and in the heat exchange box, the tail gas also directly transfers heat to a first heat exchange medium in the second heat exchanger;
the heat exchange device is arranged above the first heat exchange medium, the heat exchange device is arranged above the second heat exchange medium, the heat exchange device is arranged above the third heat exchange medium, the heat exchange device is arranged above the second heat exchange medium, and the heat exchange device is used for collecting the exhaust gas exhausted from the heat exchange tank, and the exhaust gas is collected by the heat exchange device, and the exhaust gas is utilized to transfer the heat exchange device to the first heat exchange medium.
2. The purification and heat recovery system of claim 1, further comprising a fourth compressed gas flow path comprising a compressed gas inlet for introducing compressed gas, a gas pipe, and a control valve located at the compressed gas inlet, wherein the compressed gas inlet is disposed proximate to a bottom of the heat exchange tank and the gas pipe is disposed within the heat exchange tank proximate to the bottom of the heat exchange tank and has a plurality of vent holes such that compressed gas is injected into the second liquid heat exchange medium via the plurality of vent holes.
3. The purification and heat recovery system of claim 1, wherein the first heat exchange flow is comprised of a heat exchange circuit comprising a compressor and a throttle valve, the compressor compressing the first heat exchange medium from the second heat exchanger and/or the third heat exchanger and discharging the compressed first heat exchange medium to the first heat exchanger, the first heat exchange medium heating the process gas in the first heat exchanger and then flowing into the second heat exchanger and/or the third heat exchanger via the throttle valve.
4. A purification and heat recovery system according to claim 3, wherein the process gas flows through the compressor before flowing through the first heat exchanger.
5. The purification and heat recovery system of claim 1, wherein the second liquid heat exchange medium is a cleaning liquid.
6. The purification and heat recovery system of claim 1, wherein the exhaust gas is discharged into the heat exchange tank below a liquid level within the heat exchange tank.
7. The purification and heat recovery system of claim 1, wherein the process gas is air.
8. The purification and heat recovery system of claim 1, wherein gas distribution means are provided for evenly distributing exhaust gas into the heat exchange tank.
9. The purification and heat recovery system of claim 8, wherein the heat exchange tank is further provided with an air intake line extending a distance below the liquid level within the heat exchange tank.
10. The purification and heat recovery system of claim 1, wherein the turbid liquid separation tank is further provided with a liquid drain, a liquid replenishment port and a sludge outlet, wherein the liquid drain is in fluid communication with a clear liquid inlet of the heat exchange tank and the liquid replenishment port is used for injecting a new second liquid heat exchange medium into the turbid liquid separation tank.
11. The purification and heat recovery system of claim 1, wherein the process gas is sent from the first heat exchanger to the sludge drying apparatus by a ventilation device.
12. The exhaust gas purification and heat recovery system according to claim 1, wherein the second heat exchanger is arranged in series upstream or downstream of the third heat exchanger.
13. The exhaust gas purification and heat recovery system according to claim 1, wherein the second heat exchanger is arranged in parallel with the third heat exchanger.
14. A method for purification and heat recovery of exhaust gas for sludge drying, comprising:
Providing a first heat exchange flow path comprising a first heat exchanger and a second heat exchanger, a first heat exchange medium circulating in the first heat exchange flow path and heating a process gas in the first heat exchanger for supply to a sludge drying device;
Providing a second purification and heat exchange flow path comprising a heat exchange tank containing a second liquid heat exchange medium, and arranging the second heat exchanger such that the second liquid heat exchange medium transfers heat to the first heat exchange medium in the second heat exchanger;
Providing a third turbid liquid separation flow path including a turbid liquid separation tank having a turbid liquid inlet receiving turbid liquid discharged from a turbid liquid outlet of the heat exchange tank, separating the turbid liquid, and returning obtained clear liquid to the heat exchange tank;
Filling the heat exchange tank with the second liquid heat exchange medium;
Activating the first heat exchange flow path and the second purification and heat exchange flow path so that process gas is heated in the first heat exchanger and then fed to a sludge drying device, and exhaust gas discharged from the sludge drying device is fed into the heat exchange tank so that the exhaust gas is washed by the second liquid heat exchange medium and heat is transferred to the second liquid heat exchange medium to be cooled; and
A third turbid liquid separation flow path is activated to separate turbid liquid discharged from the heat exchange tank in the turbid liquid separation tank and return obtained clear liquid to the heat exchange tank when necessary,
The second heat exchanger is arranged inside the heat exchange box, and in the heat exchange box, the tail gas also directly transfers heat to the first heat exchange medium in the second heat exchanger.
15. The purification and heat recovery method of claim 14, further comprising providing a fourth compressed gas flow path comprising a compressed gas inlet for introducing compressed gas, a gas pipe, and a control valve located at the compressed gas inlet, wherein the compressed gas inlet is disposed proximate to a bottom of the heat exchange tank and the gas pipe is disposed within the heat exchange tank proximate to the bottom of the heat exchange tank and has a plurality of vent holes such that compressed gas is injected into the second liquid heat exchange medium via the plurality of vent holes.
16. The purification and heat recovery method according to claim 14 or 15, wherein the first heat exchange flow path further comprises a third heat exchanger, wherein the third heat exchanger is connected in series or parallel with the second heat exchanger, is placed outside the heat exchange tank, and the first heat exchange medium exchanges heat in the third heat exchanger with the exhaust gas discharged from the heat exchange tank to further cool the exhaust gas, wherein the exhaust gas is collected by a gas collecting device or directly discharged into the third heat exchanger.
17. The purification and heat recovery method according to claim 16, further comprising providing a compressor and a throttle valve in the first heat exchange flow path, the compressor compressing the first heat exchange medium from the second and/or third heat exchanger and discharging the compressed first heat exchange medium to the first heat exchanger, the first heat exchange medium transferring heat to the process gas in the first heat exchanger and then flowing into the second and/or third heat exchanger via the throttle valve.
18. A purification and heat recovery method according to claim 14, comprising providing the heat exchange tank with an inlet line extending below the liquid level within the heat exchange tank.
19. The purification and heat recovery method of claim 14, further providing a gas distribution means for evenly distributing exhaust gas into the heat exchange tank.
CN201710452125.1A 2017-06-15 2017-06-15 Purification and heat recovery system and method for sludge drying waste gas Active CN109133572B (en)

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CN113398502B (en) * 2021-08-20 2021-11-02 江苏江翔光电科技有限公司 Respirator and automatic light-changing welding mask assembly equipped with same

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