CN111377585A - Negative-pressure vaporization water removal and heat recovery plate frame dehydration drying device and method - Google Patents
Negative-pressure vaporization water removal and heat recovery plate frame dehydration drying device and method Download PDFInfo
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- CN111377585A CN111377585A CN202010075875.3A CN202010075875A CN111377585A CN 111377585 A CN111377585 A CN 111377585A CN 202010075875 A CN202010075875 A CN 202010075875A CN 111377585 A CN111377585 A CN 111377585A
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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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- 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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
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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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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
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- Treatment Of Sludge (AREA)
Abstract
The invention relates to the technical field of dehydration of a plate-and-frame dehydrator, in particular to a negative-pressure vaporization dehydration and heat recovery plate-and-frame dehydration and drying device and a method, which comprises the plate-and-frame dehydrator, wherein a medicament and sludge conditioning device are connected with the plate-and-frame dehydrator through a sludge inlet pump; the steam compressor is connected with the heating filter plate and used for sucking gas in the heating filter plate to form negative pressure, water in the sludge is vaporized into steam which is sucked away by the air inlet end of the steam compressor, and the steam is pressurized to absolute pressure or higher by the steam compressor, and meanwhile, the temperature is increased; the advantages are that: the device has simple structure, can directly reduce the water content of the sludge from 99 percent to about 30 percent, reduces the volume by nearly one hundred times, and realizes the integration of sludge dewatering and drying.
Description
Technical Field
The invention relates to the technical field of dehydration of a plate-and-frame dehydrator, in particular to a negative-pressure vaporization dehydration and heat recovery plate-and-frame dehydration and drying device and method.
Background
With the progress of society, the environmental protection is deeply popular, the sewage treatment capacity is larger and larger, the sludge amount generated in the sewage treatment process is also larger and larger, and the sludge amount generated by the current sewage treatment every year can reach more than 5000 million tons. If the sludge is not well treated, secondary pollution can be formed. However, the operation cost of the existing sludge treatment is too high, and the social and economic pressure brought to sludge treatment is also very huge, which is a pair of difficult contradictions.
The most important link in the sludge treatment is reduction, the link occupies the largest investment proportion and has the highest operation cost. At present, mechanical equipment such as a centrifuge, a plate frame machine and the like is mainly used for dewatering sludge to reach the water content of 70-80%, then the sludge enters a heat drying device, the water content is reduced to about 30%, the volume of the sludge is reduced by 60-70% compared with that of the sludge subjected to mechanical dewatering, and the current mainstream technology is complex in operation and high in operation cost.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provides a negative pressure steam dehydration and heat recovery plate frame dehydration drying device and a method, which realize two working steps and functions of sludge dehydration and drying in the same plate frame dehydrator, recycle waste energy discharged in the drying process and reduce the operation cost.
In order to achieve the purpose, the negative pressure vaporization water removal and heat recovery plate frame dehydration drying device comprises a plate frame dehydrator, wherein a medicament and sludge conditioning device is connected with the plate frame dehydrator through a sludge inlet pump; the steam compressor is connected with the heating filter plate and used for sucking gas in the heating filter plate to form negative pressure, water in the sludge is vaporized into steam which is sucked away by the air inlet end of the steam compressor, and the steam is pressurized to absolute pressure or higher by the steam compressor, and meanwhile, the temperature is increased; the heat exchanger is connected with the steam compressor through a pipeline, and heated and pressurized steam enters the partition wall or one side of the pipe shell of the heat exchanger through the pipeline; one end of the heat exchanger is connected with a drain pipe through a drain valve, steam is condensed into water and then is discharged through the drain valve, and the other end of the heat exchanger is connected with a heating filter plate through a circulating water pump and is used for heating the heating filter plate in the plate frame dewatering machine.
The surface of the heating filter plate is a metal layer and is used for transferring heat to heat sludge.
The heat exchanger is connected with an external heat source.
The heat exchanger is connected with the odor treatment device through a pressure regulating valve.
A negative pressure vaporization water removal and heat recovery plate frame dehydration drying method is characterized by comprising the following steps:
A. the sludge is pumped into a plate-and-frame dehydrator by a sludge inlet pump after flocculation conditioning, the sludge is intercepted by filter cloth, most of water in the sludge is filtered, and the water content of the sludge is reduced;
B. high-temperature hot water is fed into the heating filter plate, and the metal surface of the heating filter plate transfers heat to heat sludge;
C. the vapor compressor is connected with the heating filter plate, vapor compressor sucks gas in the filter plate, negative pressure is formed, water in sludge can be vaporized into steam at 65-80 degrees and is sucked away by the vapor compressor inlet end, the partial steam is pressurized to 120kpa or higher absolute pressure by the compressor, the temperature is increased to 105 degrees or higher simultaneously, the partial steam enters one side of a partition wall or a pipe shell of the heat exchanger, low-temperature metal is encountered, the partial steam is condensed into water and then discharged through a drain valve, a large amount of latent heat is released after the steam is condensed into water, the partial heat is transmitted to cold water which flows back after the heat is released by the plate frame dehydrator, the cold water is heated, the reciprocating circulation is realized, and the heat is recovered.
The non-condensable gas in the heat exchanger is discharged into the odor treatment device through the pressure regulating valve.
Compared with the prior art, the invention has the advantages that:
1. the device has simple structure, can directly reduce the water content of the sludge from 99 percent to about 30 percent, reduces the volume by nearly one hundred times, and realizes the integration of sludge dewatering and drying;
2. the occupied area is obviously reduced compared with the traditional technology;
3. the operation cost is saved compared with the traditional dehydration and drying separate process;
4. the operation cost is further reduced by the waste steam capacity recovery technology;
5. the waste steam and the condensed hot water transfer heat through the heat exchanger and do not contact with circulating water, so that corrosion and blockage are avoided;
6. by combining with the variable-chamber high-pressure plate-and-frame dehydrator technology, the heat exchange area is doubled, and the heat transfer efficiency is high;
7. negative pressure is formed by the compressor to evaporate and remove water in the sludge, and meanwhile, steam is compressed to improve heat transfer temperature;
8. the sludge at low temperature enters the system, the sludge and wastewater are discharged from the system, and steam rich in a large amount of latent heat does not exist, so that the heat efficiency of the system is very high;
9. the energy balance of the system is maintained by means of an auxiliary heat source, and heat can be input through a heat exchanger.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, the principles of which will be apparent to those skilled in the art. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The device comprises a plate-frame dehydrator, a heating filter plate is arranged in the plate-frame dehydrator, the heating filter plate is of a hollow structure, and a high-temperature hot water pipeline is arranged in the heating filter plate; the steam compressor is connected with the heating filter plate and used for sucking gas in the heating filter plate to form negative pressure, water in the sludge is vaporized into steam which is sucked away by the air inlet end of the steam compressor, and the steam is pressurized to absolute pressure or higher by the steam compressor, and meanwhile, the temperature is increased; the heat exchanger is connected with the steam compressor through a pipeline, and heated and pressurized steam enters the partition wall or one side of the pipe shell of the heat exchanger through the pipeline; one end of the heat exchanger is connected with a drain pipe through a drain valve, steam is condensed into water and then is discharged through the drain valve, and the other end of the heat exchanger is connected with a heating filter plate through a circulating water pump and is used for heating the heating filter plate in the plate frame dewatering machine; the surface of the heating filter plate is a metal layer and is used for transferring heat to heat sludge; the heat exchanger is connected with an external heat source; the heat exchanger is connected with the odor treatment device through a pressure regulating valve.
The working principle and the steps are as follows:
1. after being flocculated and conditioned, the sludge is pumped into a plate-and-frame dehydrator by a high-pressure sludge pump of 0.8mpa, the sludge is intercepted by filter cloth, most of water in the sludge is filtered, and the water content of the sludge is reduced to about 70%.
Hot water at 2.90-100 deg.c is fed into hollow filter plate with metal layer on the surface to heat sludge. The temperature of the working water is reduced to about 70 ℃.
3. The steam compressor is connected with the hollow filter plate, the compressor sucks gas in the filter plate to form negative pressure, the general pressure is 25-60kpa (absolute pressure), thus water in sludge can be vaporized into steam at 65-80 ℃ and is sucked away by the air inlet end of the steam compressor, the part of steam is pressurized to 120kpa (or higher) of absolute pressure by the compressor, enough heat is ensured to be transferred to hot water of a working medium through the heat exchanger, meanwhile, the temperature is raised to about 105 ℃ (enough heat is ensured to be transferred to the hot water of the working medium through the heat exchanger), the part of steam enters one side of a partition wall or a pipe shell of the heat exchanger, when low-temperature metal is encountered, the part of steam is condensed into water and then is discharged through the drain valve. And a large amount of latent heat is released after the steam is condensed into water, the heat is transferred to cold water at about 70 ℃ which flows back after the heat is released by the plate frame machine, and the cold water is heated to 90-100 ℃. The heat is recovered by the reciprocating circulation.
4. The circulating water heats the filter plate in a reciprocating manner, the heat of the waste steam is recycled, and the insufficient heat of the system can supplement the heat by heating the circulating water. The heat can be input to the circulating water through a heat exchanger, and the heat source of the heat exchanger can be various external heat sources, such as a boiler, externally purchased steam, high-temperature flue gas, a heat pump and the like.
5. The non-condensable gas is discharged into the odor treatment device through the pressure regulating valve.
6. Because the water in the sludge is vaporized into steam under negative pressure and is discharged, the water content of the sludge is reduced to about 30 percent.
7. As the water in the sludge is evaporated and discharged, the volume of the filter plate is reduced, and if the chamber of the filter plate is not reduced, the mud cake is separated from one side of the metal surface of the hollow filter plate, so that the heat can not be continuously transferred to the sludge. The filter plate chamber is synchronously reduced along with the reduction of the thickness of sludge cakes by the technology of another invention patent (an elastomer sealed variable filter chamber plate-and-frame filter press, granted publication No. CN 108339300A), specifically, the filter plate is extruded by an oil cylinder, the filter cloth on the filter plate is sealed by the elastomer, and filtrate does not leak, so that the filter plate can continuously extrude the sludge cakes to approach under the push of the oil cylinder, the volume of the chamber is reduced, the central control filter plate can continuously contact with the sludge, the metal surface of the filter plate can continuously transfer heat to the sludge, and the heating and extrusion work is continuously completed.
8. The high-temperature hot water discharged from the system can heat the sludge in the sludge conditioning tank through the heat exchanger, so that the heat is further recovered.
9. The sludge is dried to about 30 percent, the whole process is finished, and the dehydrator is opened to drop the sludge. The sludge is conveyed out through the conveying equipment.
10. And (5) washing the filter plate of the dehydrator, and then entering the next batch. Each batch was approximately 2-3 hours.
Claims (6)
1. A negative pressure vaporization dewatering and heat recovery plate frame dewatering and drying device comprises a plate frame dewatering machine, a medicament and sludge conditioning device are connected with the plate frame dewatering machine through a sludge inlet pump, and the device is characterized by further comprising
The heating filter plate is arranged in the plate frame dehydration machine, the heating filter plate is of a hollow structure, and a high-temperature hot water pipeline is arranged in the heating filter plate;
the steam compressor is connected with the heating filter plate and used for sucking gas in the heating filter plate to form negative pressure, water in the sludge is vaporized into steam which is sucked away by the air inlet end of the steam compressor, and the steam is pressurized to absolute pressure or higher by the steam compressor, and meanwhile, the temperature is increased;
the heat exchanger is connected with the steam compressor through a pipeline, and heated and pressurized steam enters the partition wall or one side of the pipe shell of the heat exchanger through the pipeline; one end of the heat exchanger is connected with a drain pipe through a drain valve, steam is condensed into water and then is discharged through the drain valve, and the other end of the heat exchanger is connected with a heating filter plate through a circulating water pump and is used for heating the heating filter plate in the plate frame dewatering machine.
2. The negative pressure vaporization dewatering and heat recovery plate frame dewatering and drying device of claim 1, wherein the surface of the heating filter plate is a metal layer for transferring heat to heat sludge.
3. The negative pressure vaporization water removal and heat recovery plate frame dehydration drying device of claim 1, characterized in that the heat exchanger is connected with an external heat source.
4. The negative pressure vaporization water removal and heat recovery plate frame dehydration drying device of claim 1, characterized in that the heat exchanger is connected with the odor treatment device through a pressure regulating valve.
5. A negative pressure vaporization water removal and heat recovery plate frame dehydration drying method is characterized by comprising the following steps:
the sludge is pumped into a plate-and-frame dehydrator by a sludge inlet pump after flocculation conditioning, the sludge is intercepted by filter cloth, most of water in the sludge is filtered, and the water content of the sludge is reduced;
high-temperature hot water is fed into the heating filter plate, and the metal surface of the heating filter plate transfers heat to heat sludge;
the vapor compressor is connected with the heating filter plate, vapor compressor sucks gas in the filter plate, negative pressure is formed, water in sludge can be vaporized into steam at 65-80 degrees and is sucked away by the vapor compressor inlet end, the partial steam is pressurized to 120kpa or higher absolute pressure by the compressor, the temperature is increased to 105 degrees or higher simultaneously, the partial steam enters one side of a partition wall or a pipe shell of the heat exchanger, low-temperature metal is encountered, the partial steam is condensed into water and then discharged through a drain valve, a large amount of latent heat is released after the steam is condensed into water, the partial heat is transmitted to cold water which flows back after the heat is released by the plate frame dehydrator, the cold water is heated, the reciprocating circulation is realized, and the heat is recovered.
6. The negative pressure evaporation water removal and heat recovery plate frame dehydration drying method of claim 5, characterized in that the non-condensable gas in the heat exchanger is discharged into the odor treatment device through a pressure regulating valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010075875.3A CN111377585A (en) | 2020-01-22 | 2020-01-22 | Negative-pressure vaporization water removal and heat recovery plate frame dehydration drying device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010075875.3A CN111377585A (en) | 2020-01-22 | 2020-01-22 | Negative-pressure vaporization water removal and heat recovery plate frame dehydration drying device and method |
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| CN111377585A true CN111377585A (en) | 2020-07-07 |
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| CN202010075875.3A Pending CN111377585A (en) | 2020-01-22 | 2020-01-22 | Negative-pressure vaporization water removal and heat recovery plate frame dehydration drying device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117361832A (en) * | 2023-12-04 | 2024-01-09 | 山东纯江环境科技有限公司 | Sludge deep dehydration and drying treatment process with low electricity consumption |
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| CN204752502U (en) * | 2015-05-26 | 2015-11-11 | 浙江海拓环境技术有限公司 | Sludge dewatering subtracts appearance processing system |
| TWM520928U (en) * | 2016-01-15 | 2016-05-01 | Taiwan Press Co Ltd | Pressure filtration equipment equipped with steam heat recycling |
| CN107777853A (en) * | 2017-04-05 | 2018-03-09 | 王政峰 | Double dry method sludge treatment equipments |
| US20190015760A1 (en) * | 2017-07-12 | 2019-01-17 | James William Masten, JR. | High-Efficiency Sludge Dehydrator Using An Adaptive Mechanical Vapor Re-compression Process |
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2020
- 2020-01-22 CN CN202010075875.3A patent/CN111377585A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204752502U (en) * | 2015-05-26 | 2015-11-11 | 浙江海拓环境技术有限公司 | Sludge dewatering subtracts appearance processing system |
| TWM520928U (en) * | 2016-01-15 | 2016-05-01 | Taiwan Press Co Ltd | Pressure filtration equipment equipped with steam heat recycling |
| CN107777853A (en) * | 2017-04-05 | 2018-03-09 | 王政峰 | Double dry method sludge treatment equipments |
| US20190015760A1 (en) * | 2017-07-12 | 2019-01-17 | James William Masten, JR. | High-Efficiency Sludge Dehydrator Using An Adaptive Mechanical Vapor Re-compression Process |
Non-Patent Citations (3)
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| 全国勘察设计注册工程师环保专业管理委员会等编: "《注册环保工程师专业考试复习教材 固体废物处理处置工程技术与实践》", 31 March 2017, 中国环境出版社, pages: 321 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117361832A (en) * | 2023-12-04 | 2024-01-09 | 山东纯江环境科技有限公司 | Sludge deep dehydration and drying treatment process with low electricity consumption |
| CN117361832B (en) * | 2023-12-04 | 2024-02-23 | 山东纯江环境科技有限公司 | Sludge deep dehydration and drying treatment process with low electricity consumption |
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