CN108658425B - Double-loop sludge heat pump drying system - Google Patents
Double-loop sludge heat pump drying system Download PDFInfo
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- CN108658425B CN108658425B CN201810603188.7A CN201810603188A CN108658425B CN 108658425 B CN108658425 B CN 108658425B CN 201810603188 A CN201810603188 A CN 201810603188A CN 108658425 B CN108658425 B CN 108658425B
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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 double-loop 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. According to the invention, the drying heat pump host is arranged in the middle of the heat-insulating board room, and the upper and lower movable partition plates are arranged to enable the air flow to form a double loop, so that the air flow path is shortened, and the drying effect of the sludge is improved. The double-loop sludge heat pump drying system provided by the invention adopts a closed-loop dehumidification method to replace the traditional open-loop evaporation method to realize the drying of sludge, is integrally designed, comprehensively utilizes heat generated by solar energy, a heat pump and a waste heat exchanger to dry the sludge, and saves energy.
Description
Technical Field
The invention relates to the field of sludge drying, in particular to a double-loop 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 double-loop sludge heat pump drying system.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the double-loop sludge heat pump drying system comprises a heat insulation board house, wherein the heat insulation 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 middle of the heat preservation board room, 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; a first movable partition plate is respectively arranged between the top of the heat-insulating board house and the top of the drying heat pump host machine, and between the bottom of the heat-insulating board house and the bottom of the drying heat pump host machine, and divides the heat-insulating board house into two drying areas; 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 hot and humid air to blow to sludge are respectively arranged on the drying heat pump main machine opposite to the first movable partition plate; 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 feeding hole, a discharging hole and a sludge conveying belt and an electric rotating wheel which are symmetrically arranged on the heat-insulating board houses in two drying areas, wherein the feeding hole, the sludge conveying belt and the discharging hole 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.
According to the invention, the main machine of the drying heat pump is arranged in the middle of the heat-insulating board room, and the upper and lower movable partition boards are arranged to enable the air flow to form a double loop, so that the air flow path is shortened, and the drying effect of the sludge is improved. The double-loop sludge heat pump drying system provided by the invention adopts a closed-loop dehumidification method to replace the traditional open-loop evaporation method to realize the drying of sludge, is integrally designed, comprehensively utilizes heat generated by solar energy, a heat pump and a waste heat exchanger to dry the sludge, and saves energy.
Preferably, one end of the two first movable clapboards is movably connected to the top and the bottom of the heat insulation board room respectively through a first hinging device.
Preferably, the first movable partition plate can rotate between 0 and 180 degrees around the first hinging device, and can also stay at the positions of 0 degrees, 90 degrees and 180 degrees.
In the invention, a second movable partition plate is respectively arranged between the top of the heat-insulating board house and the top of the drying heat pump host machine, and between the bottom of the heat-insulating board house and the bottom of the drying heat pump host machine, the first movable partition plate and the second movable partition plate are arranged in a crisscross manner, and the second movable partition plate is divided into two independent parts from the middle by the first movable partition plate; the crossed connection part of the first movable partition plate and the second movable partition plate is provided with a multidirectional hinging device. The two second movable clapboards are respectively and movably connected to the top and the bottom of the heat insulation board room through second hinging devices. It should be noted that the second movable partition plate may have a length that is vertically downward or upward so as not to block the sludge conveyor belt.
The first movable partition plate and the second movable partition plate can rotate between 0 degrees and 180 degrees, when the first movable partition plate and the second movable partition plate are located at the 90-degree position, air flows form four loops, four drying areas are formed in the sludge drying system, the air flow path is further shortened, when dry hot air reaches a wet hot air inlet from a hot air outlet, the temperature and humidity change of the wet hot air is smaller than that of a common sludge heat pump drying system, the air flow temperature is higher, and the drying effect of sludge is improved.
Preferably, a circulating pump is arranged on the first vertical pipe.
Preferably, the wet hot air inlet and the dry hot air outlet are both provided with filter screens.
Preferably, the feed inlet is provided with a feed preheating device; 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) According to the invention, the main machine of the drying heat pump is arranged in the middle of the heat-insulating board room, and the air flow loop is controlled by the movable partition board, so that the air flow path can be shortened, and the drying effect of sludge is improved;
(2) 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;
(3) 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;
(4) 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
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a dual-loop sludge heat pump drying system provided in embodiment 1 of the present invention;
fig. 2 is a schematic view of the hinge position and the rotation angle of the first movable partition of the sludge heat pump drying system provided in embodiment 1;
fig. 3 is a top view of a heat insulation house structure provided with a movable partition in the sludge heat pump drying system provided in embodiment 1.
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.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
Example 1
Fig. 1 is a schematic structural view of a dual-loop sludge heat pump drying system according to this embodiment, fig. 2 is a schematic structural view of a first movable partition plate hinged position and a rotation angle of the sludge heat pump drying system, and fig. 3 is a top view of a heat insulation room structure in which a movable partition plate is disposed in the sludge heat pump drying system. As shown in the figure, the double-loop sludge heat pump drying system comprises 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 27, a second vertical pipe 28, 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 27, the second vertical pipe 28 and the horizontal pipe; because the first vertical pipe 28 and the second vertical pipe 27 of heated board room both sides wall and the horizontal pipe of bottom all arrange in the heated board room is inboard, first vertical pipe 28, second vertical pipe 27 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 air circulation system comprises a drying heat pump host machine 26 arranged in the middle of the heat insulation board room 1, 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 machine 26, 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; a first movable partition plate 11 and 11 'is respectively arranged between the top of the heat-insulating board house 1 and the top of the drying heat pump host 26 and between the bottom of the heat-insulating board house 1 and the bottom of the drying heat pump host 26, and the first movable partition plate 11 and 11' divides the heat-insulating board house 1 into two drying areas; a hot and humid air inlet 24 for enabling hot and humid air to enter the normal-temperature cooling water coil 23 and a hot air outlet 13 for enabling hot and humid air to blow to sludge are respectively arranged on a drying heat pump host 26 opposite to the first movable partition plates 11 and 11'; the solar heat exchange coil 17 is arranged in the drying heat pump host 26 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; after the system runs stably, hot air convects to heat in an airflow channel between the sludge conveyor belts 5 in the heat-insulating board house 1 to form a stable airflow structure, and finally returns to a hot and humid air inlet 24 of a heat pump drying host 26, the 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 sludge circulation system comprises a feeding port 3 and a discharging port 8 which are symmetrically arranged on the heat-insulating board houses 1 of the two drying areas, and a sludge conveying belt 6 and an electric rotating wheel 5 which are symmetrically arranged in the heat-insulating board houses 1, wherein the feeding port 3, the sludge conveying belt 6 and the discharging port 8 are sequentially connected, and the electric rotating wheel 5 drives the sludge conveying belt 6 to convey sludge.
Wherein, the two first movable clapboards 11, 11 'are respectively movably connected to the top and the bottom of the heat insulation board room 1 through one ends of the first hinging devices 10, 10'. The first movable partition 11, 11 'can rotate between 0 and 180 ° about the first hinge 10, 10'. When the first movable partition plates 11 and 11' are positioned at the 90-degree position, the air flow forms a double loop, the air flow path is shortened, and when the dry hot air reaches the wet hot air inlet 24 from the hot air outlet 13, the temperature and humidity change of the wet hot air is smaller than that of the common sludge heat pump drying system, the air flow temperature is higher, and the drying effect of the sludge is improved.
In this embodiment, a control system, a temperature detection device and a humidity detection device are disposed 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 dry hot air at the outlet of the blower and the temperature and the humidity of the hot and humid air at the hot and humid air inlet of the drying heat pump host are maintained within a proper numerical range.
Considering that the arrangement of the movable partition plate may reduce the ventilation of the two sides in the insulation board house, resulting in unbalanced drying of the two sides, the first movable partition plate 11, 11' can be controlled by the control system to stay at the 0 ° or 180 ° position, and when the volume of the partition plate is not too large, the movable partition plate can also swing between the 0 ° and 180 ° positions, so as to promote the ventilation.
In this embodiment, the sludge conveyer belt 6 is multilayer track pipeline structure, and multilayer track is established to the slope and is placed, and inclination is 10~20 to the preferred, and the track of slope can optimize the air current organization, reduces hot-blast natural convection resistance, avoids steam to condense in the upper track to make full use of fan power improves system efficiency. In addition, the multi-layered crawler 6 can be arranged horizontally, namely, the inclined angle is zero degree according to the space of the actual site and the requirement of sludge treatment.
Optionally, the multi-layer crawler belt is inclined towards the direction of the central heat pump drying main machine 26, and also inclined towards the side wall of the heat preservation room 1, namely, the inclination angle can be 10-20 degrees or 160-170 degrees.
The first vertical pipe 27 is provided with a circulating pump 12, and the hot and humid air inlet 24 and the hot and dry air outlet 13 are provided with a filter screen 25. The feeding inlet is provided with a feeding preheating device; 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.
The hot air circulating system is characterized in that a discharge hopper is further arranged at the discharge port, and the hot air circulating system further comprises a blower which is arranged at the hot air outlet and used for blowing hot air to sludge.
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 (10)
1. The double-loop sludge heat pump drying system is characterized by comprising a heat-insulating board house (1), wherein the heat-insulating 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 (27), a second vertical pipe (28), 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 (27), the second vertical pipe (28) and the horizontal pipe; the hot air circulation system comprises a drying heat pump host machine (26) arranged in the middle of the heat insulation 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 (26), 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 first movable partition board (11, 11 ') is respectively arranged between the top of the heat-insulating board house (1) and the top of the drying heat pump host machine (26) and between the bottom of the heat-insulating board house (1) and the bottom of the drying heat pump host machine (26), and the first movable partition board (11, 11') divides the heat-insulating board house (1) into two drying areas; a hot and humid air inlet (24) for enabling hot and humid air to enter the normal-temperature cooling water coil (23) and a hot air outlet (13) for enabling hot and humid air to blow to sludge are respectively arranged on a drying heat pump host (26) opposite to the first movable partition plates (11, 11'); the solar heat exchange coil (17) is arranged in the drying heat pump host (26) 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 feeding port (3) and a discharging port (8) which are symmetrically arranged on the heat-insulating board houses (1) of the two drying areas, and a sludge conveying belt (6) and an electric rotating wheel (5) which are symmetrically arranged in the heat-insulating board houses (1), wherein the feeding port (3), the sludge conveying belt (6) and the discharging port (8) are sequentially connected, the electric rotating wheel (5) drives the sludge conveying belt (6) to convey sludge,
a second movable partition plate is arranged between the top of the heat-insulating board house and the top of the drying heat pump host machine and between the bottom of the heat-insulating board house and the bottom of the drying heat pump host machine respectively, the first movable partition plate and the second movable partition plate are arranged in a crisscross manner, and the second movable partition plate is divided into two independent parts from the middle by the first movable partition plate; the cross connection part of the first movable partition plate and the second movable partition plate is provided with a multidirectional hinging device, and the two second movable partition plates are respectively and movably connected to the top and the bottom of the heat insulation board house through the second hinging device.
2. The dual-circuit sludge heat pump drying system according to claim 1 characterized in that the two first movable partition plates (11, 11 ') are respectively movably connected to the top and bottom of the insulation board house (1) by first hinge means (10, 10').
3. The dual-circuit sludge heat pump drying system according to claim 1 wherein the first movable partition (11, 11 ') is rotatable between 0 and 180 ° centred on the first hinge means (10, 10').
4. The dual circuit sludge heat pump drying system of claim 1 wherein a circulation pump (12) is provided on the first vertical tube (27).
5. The dual-circuit sludge heat pump drying system according to claim 1, characterized in that a filter screen (25) is arranged at both the hot and humid air inlet (24) and the dry hot air outlet (13).
6. The dual-circuit sludge heat pump drying system according to claim 1, characterized in that the feed inlet (3) is provided with a feed preheating device (4).
7. The dual-circuit sludge heat pump drying system according to claim 1, characterized in that the discharge outlet (8) is provided with a discharge heat recovery device (7).
8. The dual-loop sludge heat pump drying system according to claim 1, characterized in that a discharge hopper (9) is also provided at the discharge opening (8).
9. The dual loop sludge heat pump drying system of claim 1 wherein the sludge conveyor belt is inclined.
10. The dual loop sludge heat pump drying system of claim 9 wherein the sludge conveyor belt is inclined at an angle of 10 to 20 °.
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| CN201810603188.7A CN108658425B (en) | 2018-06-12 | 2018-06-12 | Double-loop sludge heat pump drying system |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009154416A2 (en) * | 2008-06-20 | 2009-12-23 | 유한회사 세원산업 | Sludge dryer with increased retention time |
| CN206467121U (en) * | 2016-11-10 | 2017-09-05 | 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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- 2018-06-12 CN CN201810603188.7A patent/CN108658425B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009154416A2 (en) * | 2008-06-20 | 2009-12-23 | 유한회사 세원산업 | Sludge dryer with increased retention time |
| CN206467121U (en) * | 2016-11-10 | 2017-09-05 | 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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