CN111960643A - Sludge drying system - Google Patents
Sludge drying system Download PDFInfo
- Publication number
- CN111960643A CN111960643A CN202011021079.8A CN202011021079A CN111960643A CN 111960643 A CN111960643 A CN 111960643A CN 202011021079 A CN202011021079 A CN 202011021079A CN 111960643 A CN111960643 A CN 111960643A
- Authority
- CN
- China
- Prior art keywords
- drying
- sludge
- gas
- moisture absorption
- moisture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001035 drying Methods 0.000 title claims abstract description 104
- 239000010802 sludge Substances 0.000 title claims abstract description 62
- 239000007789 gas Substances 0.000 claims abstract description 63
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000010521 absorption reaction Methods 0.000 claims description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 7
- 239000002912 waste gas Substances 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000010865 sewage Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000007791 dehumidification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000010336 energy treatment Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
Classifications
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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
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
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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
- F23G7/001—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals for sludges or waste products from water treatment installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B11/00—Machines or apparatus for drying solid materials or objects with movement which is non-progressive
- F26B11/02—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles
- F26B11/04—Machines or apparatus for drying solid materials or objects with movement which is non-progressive in moving drums or other mainly-closed receptacles rotating about a horizontal or slightly-inclined axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/10—Temperature; Pressure
Abstract
The invention discloses a sludge drying system, which is provided with: a drying system that dries wet sludge containing moisture using a hot drying gas; a heat exchange system for heating the cold drying gas using a heat source; a transfer path that carries the drying gas in a closed cycle between the heat exchange system and the drying system. The invention has the beneficial effects that: in the whole process, the drying gases are circulated in the system in a closed manner all the time, the total amount of the drying gases is unchanged, the drying gases are not exchanged with the outside air, the odor cannot overflow, and the system has good environmental protection and economic benefits.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a sludge drying system.
Background
Along with the progress of social economy, the population of cities is continuously increased, and the urban sewage treatment has been more and more widely regarded as a city planting environment-friendly facility. Although the municipal sewage treatment plant is an important means for solving the water pollution, the sludge produced by the municipal sewage treatment plant is a public nuisance affecting the urban environment, and 0.5 to 1% of the volume of the treated sewage is converted into solid aggregates and settled, which is called sludge. The disposal of sludge is a more difficult problem than the disposal of sewage, and the random stacking and discharge of large amounts of untreated sludge causes new pollution to the environment, and the disposal cost of the sludge is generally equivalent to the cost of sewage disposal.
The treatment method taking incineration as a core is the most thorough treatment method of sludge, can completely carbonize organic matters, kill pathogens, reduce the volume of the sludge to the maximum extent, realize the recycling of energy and solve the final disposal problem of sludge-state solid waste.
The sludge solid waste in China, such as municipal sludge, paper making sludge, printing and dyeing sludge and the like, has the characteristics of low organic matter content, low heat value, high water content, difficult combustion and the like. Before incineration, sludge is usually dried, but in the drying process, odor in the sludge is inevitably volatilized, so that great harm is caused to the environment and operators.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a sludge drying system, in which drying gas is circulated in a closed manner, and does not exchange with outside air, and odor does not escape.
Aiming at the problems, the invention adopts a technical scheme that: the utility model provides a mud drying system which characterized in that includes:
a drying system that dries a moisture-containing sludge using a hot drying gas to form a dried sludge and a moisture-containing, cold drying gas;
a moisture absorption system for absorbing moisture in the cold drying gas discharged from the drying system;
the heat exchange system is used for heating the cold-state drying gas subjected to moisture absorption treatment by using a heat source to form hot-state drying gas;
a transfer path that carries the drying gas in a closed cycle among the moisture absorption system, the heat exchange system, and the drying system.
Further, the drying system has:
a drying rotary kiln that dries sludge containing moisture using a hot drying gas;
and the gas-solid separation device is used for carrying out gas-solid separation on the mixed material discharged from the drying rotary kiln to form dry sludge and cold-state drying gas and discharging the dry sludge.
Further, the moisture absorption system has:
a moisture absorption tower for absorbing moisture in the cold-state drying gas discharged from the drying system by using water;
and the cooling device is used for cooling the water in the moisture absorption tower.
Further, the heat source is high-temperature waste gas generated by burning the dried sludge.
Furthermore, the heat exchange system comprises a cyclone dust removal heat exchanger and a secondary heat exchanger, and the high-temperature waste gas sequentially enters the cyclone dust removal heat exchanger and the secondary heat exchanger to perform secondary heat exchange with the cold-state drying gas discharged from the moisture absorption tower.
Further, the gas-solid separation device comprises a sedimentation bin, the sedimentation bin is provided with a dry sludge outlet and a gas outlet, and the gas outlet is communicated with the moisture absorption tower.
Further, the cooling device includes: and the moisture absorption tower is connected with the cooling tower through a water pump and a circulating return pipe.
Further, the temperature of the hot drying gas heated by the heat exchange system is not lower than 350 ℃.
The invention has the beneficial effects that: the cold drying gas starts from the moisture absorption tower and enters a heat exchange system to exchange heat with a heat source, the temperature of the drying gas is raised to be higher than 350 ℃, then the drying gas is sent into the drying rotary kiln, wet sludge materials also enter the drying rotary kiln, the materials are dried by the drying gas and then enter a settling bin, the temperature of the drying gas is reduced to be lower than 70 ℃, a large amount of moisture in the wet sludge is absorbed, the drying gas enters the moisture absorption tower through a pipeline, the moisture absorbed by the drying gas is absorbed by low-temperature water in the moisture absorption tower, the drying gas is further cooled after passing through the moisture absorption tower, and the drying gas after moisture absorption enters the heat exchange system again to perform a new round of circulation; in the whole process, the drying gases are circulated in the drying rotary kiln, the heat exchanger and the moisture absorption tower in a closed manner all the time, the gases enter the drying kiln after being heated to high temperature, the moisture content is increased and then enters the dehumidification tower, the moisture content is removed and then enters the heat exchanger, and the gases are circulated in a reciprocating manner, so that the total amount of the drying gases is unchanged, the drying gases are not in contact with the outside air, and the odor cannot overflow; furthermore, the invention can also utilize the waste heat of the high-temperature waste gas generated by sludge incineration to heat the drying gas, thereby reducing the overall energy consumption and cost of sludge treatment.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention.
Description of reference numerals:
s1 drying system
S2 moisture absorption system
S3 heat exchange system
1 drying rotary kiln
2 settling bin
3 moisture absorption tower
4 two-stage heat exchanger
5 cyclone dust-removing heat exchanger
6 induced draft fan
7 wet sludge inlet
8 cooling tower
9 Water pump
M1 wet sludge
M2 Dry sludge
A1 drying gas
A2 Heat Source
W hygroscopic water
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and will thus make the scope of the invention more clearly and clearly defined. The sludge drying system of the embodiment is equipment for drying wet sludge containing moisture, and further can reduce the overall energy consumption and treatment cost of sludge treatment by using the combustion waste heat of sludge incineration.
Referring to fig. 1, the sludge drying system of the present embodiment includes: a drying system S1 for drying wet sludge M1 containing moisture by using hot drying gas A1; a heat exchange system S3 for heating the cold drying gas A1 by using a heat source A2; and a moisture absorption system S2 for absorbing moisture in the drying gas A1.
The drying system S1 includes: drying rotary kiln 1 and settling bin 2; the drying rotary kiln 1 is provided with a wet sludge inlet 7, wet sludge M1 containing moisture enters the drying rotary kiln 1 from the wet sludge inlet 7, and after being dried by hot drying gas A1, a material mixture generated by the drying rotary kiln 1 enters a settling bin 2 to realize gas-solid separation: the separated dry sludge M2 is discharged and enters the subsequent incineration treatment process; the temperature of the separated cold drying gas A1 is reduced to below 70 ℃, and a large amount of moisture in the wet sludge M1 is adsorbed therein, so that the cold drying gas A1 is introduced into a moisture absorption system S2 for moisture absorption treatment.
The moisture absorption system S2 includes: a moisture absorption tower 3 and a cooling tower 8; the moisture absorption tower 3 absorbs moisture in the dry gas a1 by using the low-temperature hygroscopic water W, and meanwhile, the temperature of the dry gas a1 is further reduced, and the temperature of the hygroscopic water W in the moisture absorption tower 3 is increased due to moisture absorption, so that the hygroscopic water W is introduced to the cooling tower 16 through the circulating pump 9 for cooling, and then circulated back to the moisture absorption tower 3, so that the hygroscopic water W is in a low-temperature state; the cold drying gas A1 after the moisture is removed then enters the heat exchange system S3 to perform the next round of temperature rise cycle.
The heat exchange system S3 includes: the cold drying gas A1 enters the secondary heat exchanger 4 to perform primary heat exchange with a heat source A2 from the moisture absorption tower 3, then enters the cyclone dust removal heat exchanger 5 to perform secondary heat exchange with a heat source A2, the temperature of the drying gas A2 is raised to above 350 ℃ after the secondary heat exchange, and then the drying gas A2 is sent into the drying rotary kiln 1 through the induced draft fan 6 to dry the wet sludge M1.
In the whole drying process, the drying gas A1 is continuously circulated in the drying system S1, the moisture absorption system S2 and the heat exchange system S3, is not in exchange contact with the outside air, is in closed circulation, and does not overflow odor.
In another embodiment of the invention, the heat source A2 of the heat exchange system S3 can be high-temperature waste gas generated by incinerating dry sludge M2, and the waste heat of the high-temperature waste gas is recycled to dry wet sludge, so that the energy consumption of the whole sludge treatment can be reduced, the thermal efficiency of equipment is improved, and the investment cost is reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The utility model provides a mud drying system which characterized in that includes:
a drying system that dries a moisture-containing sludge using a hot drying gas to form a dried sludge and a moisture-containing, cold drying gas;
a moisture absorption system for absorbing moisture in the cold drying gas discharged from the drying system;
the heat exchange system is used for heating the cold-state drying gas subjected to moisture absorption treatment by using a heat source to form hot-state drying gas;
a transfer path that carries the drying gas in a closed cycle among the moisture absorption system, the heat exchange system, and the drying system.
2. The sludge drying system of claim 1, wherein the drying system comprises:
a drying rotary kiln that dries sludge containing moisture using a hot drying gas;
and the gas-solid separation device is used for carrying out gas-solid separation on the mixed material discharged from the drying rotary kiln to form dry sludge and cold-state drying gas and discharging the dry sludge.
3. The sludge drying system of claim 1, wherein the moisture absorption system comprises:
a moisture absorption tower for absorbing moisture in the cold-state drying gas discharged from the drying system by using water;
and the cooling device is used for cooling the water in the moisture absorption tower.
4. The sludge drying system of claim 2, wherein the heat source is high temperature exhaust gas generated by burning the dried sludge.
5. The sludge drying system according to claim 4, wherein the heat exchange system comprises a cyclone dust removal heat exchanger and a secondary heat exchanger, and the high-temperature waste gas sequentially enters the cyclone dust removal heat exchanger and the secondary heat exchanger to perform secondary heat exchange with the cold-state drying gas discharged from the moisture absorption tower.
6. The sludge drying system of claim 2, wherein the gas-solid separation device comprises a settling bin, the settling bin is provided with a dry sludge outlet and a gas outlet, and the gas outlet is communicated with the moisture absorption tower.
7. The sludge drying system of claim 3, wherein the cooling device comprises: and the moisture absorption tower is connected with the cooling tower through a water pump and a circulating return pipe.
8. The sludge drying system of claim 1, wherein the temperature of the hot drying gas heated by the heat exchange system is not lower than 350 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011021079.8A CN111960643A (en) | 2020-09-25 | 2020-09-25 | Sludge drying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011021079.8A CN111960643A (en) | 2020-09-25 | 2020-09-25 | Sludge drying system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111960643A true CN111960643A (en) | 2020-11-20 |
Family
ID=73387077
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011021079.8A Pending CN111960643A (en) | 2020-09-25 | 2020-09-25 | Sludge drying system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111960643A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1807292A (en) * | 2006-02-17 | 2006-07-26 | 浙江大学 | Method for drying sludge using combined flume residual heat and supplied heat |
| CN102219346A (en) * | 2011-05-26 | 2011-10-19 | 福州庄讯环保科技有限公司 | System for drying and treating sludge by utilizing afterheat to generate high-temperature circulating air |
| CN104016564A (en) * | 2014-06-23 | 2014-09-03 | 王子国 | Sludge multi-effect drying incineration treatment system and application method thereof |
| CN205874188U (en) * | 2016-07-28 | 2017-01-11 | 瑞科际再生能源股份有限公司 | Heat pump dehumidification circulation system |
| CN108069576A (en) * | 2016-11-10 | 2018-05-25 | 桑尼环保（江苏）有限公司 | A kind of closed system of pump coupled heat absorbed type drying sludge |
-
2020
- 2020-09-25 CN CN202011021079.8A patent/CN111960643A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1807292A (en) * | 2006-02-17 | 2006-07-26 | 浙江大学 | Method for drying sludge using combined flume residual heat and supplied heat |
| CN102219346A (en) * | 2011-05-26 | 2011-10-19 | 福州庄讯环保科技有限公司 | System for drying and treating sludge by utilizing afterheat to generate high-temperature circulating air |
| CN104016564A (en) * | 2014-06-23 | 2014-09-03 | 王子国 | Sludge multi-effect drying incineration treatment system and application method thereof |
| CN205874188U (en) * | 2016-07-28 | 2017-01-11 | 瑞科际再生能源股份有限公司 | Heat pump dehumidification circulation system |
| CN108069576A (en) * | 2016-11-10 | 2018-05-25 | 桑尼环保（江苏）有限公司 | A kind of closed system of pump coupled heat absorbed type drying sludge |
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