CN108503186B - Sludge heat pump drying system - Google Patents
Sludge heat pump drying system Download PDFInfo
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- CN108503186B CN108503186B CN201810603180.0A CN201810603180A CN108503186B CN 108503186 B CN108503186 B CN 108503186B CN 201810603180 A CN201810603180 A CN 201810603180A CN 108503186 B CN108503186 B CN 108503186B
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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
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Abstract
The invention relates to a sludge heat pump drying system which comprises a heat-insulating board house, wherein the heat-insulating board house is provided with a solar heat conduction circulating system, a hot air circulating system and a sludge circulating system. The sludge heat pump drying system provided by the invention enables the drying hot air to circulate in the heat insulation board house, and convect heat exchange is carried out in the gaps between the sludge conveyor belts, so that the water in the sludge is brought to the evaporator coil and is discharged out of the board house through the condensed water drain pipe, and the purpose of drying is achieved. The invention adopts the closed-loop dehumidification method to replace the traditional open-loop evaporation method to realize the drying of the sludge, has the advantages of integrated design, simple installation and stable performance, comprehensively utilizes the heat generated by the solar energy, the heat pump and the waste heat exchanger to dry the sludge, greatly reduces the energy consumption in the sludge drying process and saves the energy.
Description
Technical Field
The invention relates to the field of sludge drying, in particular to a sludge heat pump drying system.
Background
Different kinds of waste materials are produced in different processes in the paper making production process, wherein paper sludge is an end product of wastewater treatment in the paper making process, and the main components of the paper sludge are dust, paper pulp, felt fibers and fillers which cannot be separated. Besides short fiber substances, the material also contains a plurality of organic matters, nitrogen, phosphorus, chlorine, heavy metals, parasitic ova, pathogenic bacteria and other components which are harmful to human health, and the material must be properly disposed. The conventional treatment method adopts landfill and incineration, and the sludge is treated in a landfill mode, so that printing ink, pigment, chemical agents and the like in the sludge easily permeate into the ground through stratum, the damage to a groundwater source is extremely large, and once the groundwater is polluted, the groundwater needs to be recovered naturally for nearly one hundred years.
Incineration is becoming more and more important because of its unique advantages of being able to achieve harmless, reduced amounts and recycling. Before the papermaking sludge is directly incinerated, the water content of the sludge needs to be reduced to less than 39 percent (more than 75 percent of sludge dryness) in order to avoid heat waste, but the drying cost is high, so that the sludge is not greatly developed.
Therefore, it is necessary to design a low-cost and high-efficiency sludge heat pump drying system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a sludge heat pump drying system.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the sludge heat pump drying system comprises a heat-insulating board house, wherein the heat-insulating board house is provided with a solar heat conduction circulating system, a hot air circulating system and a sludge circulating system;
the solar heat conduction circulation system comprises a solar heat collecting plate, a first vertical pipe, a second vertical pipe, a horizontal pipe and a solar heat exchange coil pipe which are arranged outside the heat preservation board room, wherein the solar heat collecting plate is communicated with the solar heat exchange coil pipe through the first vertical pipe, the second vertical pipe and the horizontal pipe;
the hot air circulation system comprises a drying heat pump host machine arranged in the heat preservation board room, wherein a normal-temperature cooling water coil, an evaporator coil, a normal-temperature circulating water coil, a condenser coil and a residual heat exchanger are sequentially arranged in the drying heat pump host machine, the evaporator coil and the condenser coil are communicated, a compressor and a throttling device are respectively arranged on two side pipelines communicated with the evaporator coil, and a condensed water drain pipe is also arranged on the evaporator coil; the main machine of the drying heat pump is provided with a hot and humid air inlet for enabling hot and humid air to enter the normal-temperature cooling water coil pipe and a hot air outlet for enabling drying hot air to blow to sludge; the solar heat exchange coil is arranged in the drying heat pump host, and is arranged between the normal-temperature circulating water coil and the condenser coil or after the waste heat exchanger is arranged in sequence;
the sludge circulation system comprises a feed inlet and a discharge outlet which are arranged on the heat-insulating board house, and a sludge conveying belt and an electric rotating wheel which are arranged in the heat-insulating board house, wherein the feed inlet, the sludge conveying belt and the discharge outlet are sequentially connected, and the electric rotating wheel drives the sludge conveying belt to convey sludge.
After the heat-conducting medium in the solar heat-conducting circulation system absorbs solar energy in the solar heat collecting plate outside the heat-insulating board room, the heat-conducting medium continuously flows through the first vertical pipe on the inner side surface of the heat-insulating board room to flow downwards to enter the solar heat-exchanging coil, and the heat-conducting medium continuously flows upwards to enter the solar heat collecting plate to continuously absorb heat through the second vertical pipe on the other inner side surface of the heat-insulating board room, so that a circulation loop is formed. Wherein, first vertical pipe, second vertical pipe and horizontal pipe can not need strict heat preservation performance, because the heat dissipation capacity of pipeline exists in the heated board room is inboard, can carry out auxiliary heating to the mud in the heated board room.
The hot and humid air in the hot air circulating system enters the heat pump drying host machine through the hot and humid air inlet, is cooled in the normal temperature cooling water coil pipe to form hot and humid air, then passes through the evaporator coil pipe, water vapor in the hot and humid air is condensed, the condensed water is directly discharged out of the heat insulation board house and is treated in a sewage form, the cold air after passing through the evaporator coil pipe flows through the normal temperature circulating water coil pipe to be preheated, then enters the solar heat exchange coil pipe to be heated, then enters the condenser coil pipe of the heat pump host machine to be heated, finally enters the residual heat exchanger to be heated again to form dry hot air, and the dry hot air is sent between the sludge conveying belts by the blower to dry sludge. In the invention, the solar heat exchange coil can also be arranged behind the heat pump host, hot air firstly enters the condenser coil of the heat pump host for heating, then enters the residual heat exchanger for heating, and finally enters the solar heat exchange coil. The arrangement sequence of the heating devices can be adjusted according to the conditions of the temperature of the waste heat source, the temperature of the heat conducting medium in the solar heat collecting plate, the power of the heat pump and the like.
After the system operates stably, hot air convects to heat in an airflow channel between sludge conveying belts in the heat-insulating board house to form a stable airflow structure, and finally returns to a hot and humid air inlet of a drying heat pump host, hot air always flows in the heat-insulating board house, is in a closed-loop dehumidification mode, is closed and free from leakage, dust cannot be dispersed to the outside, secondary pollution to the surrounding environment is avoided, and the sanitary requirement is met. The hot air can reach higher temperature after being heated for multiple times, and has better sludge drying effect.
The heat source of the waste heat exchanger can be industrial waste heat such as high-temperature flue gas or waste water, waste gas and waste heat.
Preferably, the solar heat collecting plate is arranged at the top of the heat insulation board house.
Preferably, a circulating pump is arranged on the horizontal pipe of the solar heat conduction circulating system.
Preferably, a filter screen is arranged at the hot and humid air inlet.
Preferably, the feed inlet is provided with a feed preheating device.
Preferably, the discharge port is provided with a discharge heat recovery device.
When the sludge is fed, the feeding sludge is preheated by the feeding preheating device, and when the sludge is discharged, the heat recovery device is used for recovering heat from the high-temperature sludge.
Preferably, a discharge hopper is further arranged at the discharge hole.
Preferably, the hot air circulation system further comprises a blower provided at the hot air outlet for blowing hot air to the sludge.
Preferably, the sludge conveyor belt is arranged obliquely.
Preferably, the angle of inclination is 10 to 20 °.
Preferably, the sludge conveyor belt is a multi-layer track pipeline structure. The sludge is fed through the upper part of the heat-insulating board house, and is discharged from the bottom of the heat-insulating board house after multi-layer circulation.
In the invention, a control system, a temperature detection device and a humidity detection device are arranged in the sludge heat pump drying system, and the control system controls the system through data of the temperature detection device and the humidity detection device, so that the temperature and the humidity of the hot air at the outlet of the blower and the temperature and the humidity of the hot air at the hot and humid air inlet of the main machine of the drying heat pump are maintained within a proper numerical range.
Preferably, the temperature of the dry hot air at the outlet of the blower is 60-70 ℃, the humidity is 10% RH, the temperature of the wet hot air at the inlet of the wet hot air is 50 ℃, and the humidity is 80% RH.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention adopts a closed-loop dehumidification method to replace the traditional open-loop evaporation method to realize the drying of the sludge, adopts a closed-loop, low-temperature and dehumidification mode, is closed without leakage, prevents dust from being scattered to the outside, avoids secondary pollution to the surrounding environment, and meets the sanitary requirement;
(2) The sludge heat pump drying system provided by the invention is designed integrally, is simple to install and stable in performance, has small relation between the system efficiency and the outside climate, and can ensure the drying effect in any region and under any climate condition;
(3) The invention comprehensively utilizes the heat generated by the solar energy, the heat pump and the waste heat exchanger to dry the sludge, thereby greatly reducing the energy consumption in the sludge drying process and saving the energy.
Drawings
Fig. 1 is a schematic structural diagram of a sludge heat pump drying system provided in embodiment 1 of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Fig. 1 is a schematic structural diagram of a sludge heat pump drying system provided in this embodiment, as shown in fig. 1, where the sludge heat pump drying system includes a heat insulation board house 1, and the heat insulation board house 1 is provided with a solar heat conduction circulation system, a hot air circulation system and a sludge circulation system;
the solar heat conduction circulation system comprises a solar heat collecting plate 2, a first vertical pipe 7, a second vertical pipe 8, a horizontal pipe and a solar heat exchange coil 17 which are arranged outside the heat insulation board room 1, wherein the solar heat collecting plate 2 and the solar heat exchange coil 17 are communicated through the first vertical pipe 7, the second vertical pipe 8 and the horizontal pipe;
the hot air circulation system comprises a drying heat pump host 24 arranged in the heat insulation board room 1, wherein a normal temperature cooling water coil 23, an evaporator coil 21, a normal temperature circulating water coil 19, a condenser coil 16 and a waste heat exchanger 15 are sequentially arranged in the drying heat pump host 24, the evaporator coil 21 and the condenser coil 16 are communicated, a compressor 20 and a throttling device 18 are respectively arranged on two side pipelines communicated with the evaporator coil 21, and a condensed water drain pipe 22 is also arranged on the evaporator coil 21; the refrigerant passes through the compressor 20, the condenser coil 16, the restriction 18, and the evaporator coil 22, respectively, to form a circulation loop. The drying heat pump main unit 24 is provided with a hot and humid air inlet 25 for enabling hot and humid air to enter the normal-temperature cooling water coil 23 and a hot air outlet 26 for enabling hot and humid air to blow to sludge; the solar heat exchange coil 17 is arranged in the drying heat pump host 24 and between the normal-temperature circulating water coil 19 and the condenser coil 16 or after the waste heat exchanger 15 is arranged in sequence;
the sludge circulation system comprises a feed inlet 3 and a discharge outlet 10 which are arranged on the heat-insulation board house 1, and a sludge conveying belt 6 and an electric rotating wheel 5 which are arranged in the heat-insulation board house 1, wherein the feed inlet 3, the sludge conveying belt 6 and the discharge outlet 10 are sequentially connected, and the electric rotating wheel 5 drives the sludge conveying belt 6 to convey sludge.
The solar heat conduction circulating system comprises a horizontal pipe, a circulating pump 12 is arranged on the horizontal pipe, a filter screen 13 is arranged at a hot and humid air inlet 25, a feeding preheating device 4 is arranged at a feeding inlet 3, a discharging heat recovery device 9 is arranged at a discharging outlet 10, a discharging hopper 11 is further arranged at the discharging outlet 10, and a blower 14 which is arranged at a hot air outlet 26 and used for blowing hot air to sludge is further arranged in the hot air circulating system.
In this embodiment, the sludge conveyor belt is disposed in an inclined manner, the inclined angle is 10-20 °, and the sludge conveyor belt is in a multi-layer track assembly line structure.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (8)
1. The sludge heat pump drying system is characterized by comprising a heat insulation board house (1), wherein the heat insulation board house (1) is provided with a solar heat conduction circulating system, a hot air circulating system and a sludge circulating system;
the solar heat conduction circulation system comprises a solar heat collecting plate (2), a first vertical pipe (7), a second vertical pipe (8), a horizontal pipe and a solar heat exchange coil (17) which are arranged outside the heat preservation board room (1), wherein the solar heat collecting plate (2) and the solar heat exchange coil (17) are communicated through the first vertical pipe (7), the second vertical pipe (8) and the horizontal pipe;
the hot air circulation system comprises a drying heat pump host machine (24) arranged in a heat preservation board room (1), a normal-temperature cooling water coil pipe (23), an evaporator coil pipe (21), a normal-temperature circulating water coil pipe (19), a condenser coil pipe (16) and a residual heat exchanger (15) are sequentially arranged in the drying heat pump host machine (24), the evaporator coil pipe (21) is communicated with the condenser coil pipe (16), a compressor (20) and a throttling device (18) are respectively arranged on two side pipelines communicated with the evaporator coil pipe (21), and a condensed water drain pipe (22) is also arranged on the evaporator coil pipe (21); a hot and humid air inlet (25) for enabling hot and humid air to enter the normal-temperature cooling water coil (23) and a hot air outlet (26) for enabling hot and humid air to blow to sludge are arranged on the drying heat pump main machine (24); the solar heat exchange coil (17) is arranged in the drying heat pump host (24) and between the normal-temperature circulating water coil (19) and the condenser coil (16) or after the waste heat exchangers (15) are arranged in sequence;
the sludge circulation system comprises a feed inlet (3) and a discharge outlet (10) which are arranged on the heat-insulation board house (1), and a sludge conveying belt (6) and an electric rotating wheel (5) which are arranged in the heat-insulation board house (1), wherein the feed inlet (3), the sludge conveying belt (6) and the discharge outlet (10) are sequentially connected, and the electric rotating wheel (5) drives the sludge conveying belt (6) to convey sludge;
the hot air circulation system further comprises a blower (14) arranged at the hot air outlet (26) and used for blowing hot air to the sludge;
the sludge conveying belt is obliquely arranged.
2. Sludge heat pump drying system according to claim 1, characterized in that the horizontal pipe of the solar heat conducting circulation system is provided with a circulation pump (12).
3. A sludge heat pump drying system according to claim 1 wherein a screen (13) is provided at the hot and humid air inlet (25).
4. Sludge heat pump drying system according to claim 1, characterized in that the feed inlet (3) is provided with a feed preheating device (4).
5. Sludge heat pump drying system according to claim 1, characterized in that the discharge outlet (10) is provided with a discharge heat recovery device (9).
6. Sludge heat pump drying system according to claim 1, characterized in that the discharge opening (10) is further provided with a discharge hopper (11).
7. The sludge heat pump drying system of claim 1 wherein the sludge conveyor belt is inclined at an angle of 10 to 20 °.
8. The sludge heat pump drying system of claim 1 wherein the sludge conveyor belt is a multi-layered track pipeline structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810603180.0A CN108503186B (en) | 2018-06-12 | 2018-06-12 | Sludge heat pump drying system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810603180.0A CN108503186B (en) | 2018-06-12 | 2018-06-12 | Sludge heat pump drying system |
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| Publication Number | Publication Date |
|---|---|
| CN108503186A CN108503186A (en) | 2018-09-07 |
| CN108503186B true CN108503186B (en) | 2023-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810603180.0A Active CN108503186B (en) | 2018-06-12 | 2018-06-12 | Sludge heat pump drying system |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113680807A (en) * | 2021-08-31 | 2021-11-23 | 南京仁丰汇达环境科技发展有限公司 | In-situ ex-situ soil remediation system based on heat pump thermal desorption |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102603148A (en) * | 2012-03-21 | 2012-07-25 | 江苏大学 | Integrated solar sludge drying system |
| CN103482838A (en) * | 2012-06-13 | 2014-01-01 | 中国科学院理化技术研究所 | Solar energy heat pump combined sludge drying system and drying method |
| JP2017116196A (en) * | 2015-12-25 | 2017-06-29 | 公益財団法人日本下水道新技術機構 | Sewage sludge drying system |
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2018
- 2018-06-12 CN CN201810603180.0A patent/CN108503186B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102603148A (en) * | 2012-03-21 | 2012-07-25 | 江苏大学 | Integrated solar sludge drying system |
| CN103482838A (en) * | 2012-06-13 | 2014-01-01 | 中国科学院理化技术研究所 | Solar energy heat pump combined sludge drying system and drying method |
| JP2017116196A (en) * | 2015-12-25 | 2017-06-29 | 公益財団法人日本下水道新技術機構 | Sewage sludge drying system |
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| CN108503186A (en) | 2018-09-07 |
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