CN214528655U - Carbon dioxide heat pump sludge drying system - Google Patents
Carbon dioxide heat pump sludge drying system Download PDFInfo
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- CN214528655U CN214528655U CN202120205038.8U CN202120205038U CN214528655U CN 214528655 U CN214528655 U CN 214528655U CN 202120205038 U CN202120205038 U CN 202120205038U CN 214528655 U CN214528655 U CN 214528655U
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Abstract
The utility model discloses a carbon dioxide heat pump sludge drying system, carbon dioxide heat pump sludge drying system includes: the sludge drying unit is used for drying sludge to obtain dried sludge and damp and hot air; and carbon dioxide heatA pump unit configured to form the hot and humid air flowing from the sludge drying unit into dry high-temperature air, and then return the dry high-temperature air to the sludge drying unit, the dry high-temperature air serving as a heat source for drying sludge. The utility model adopts supercritical CO2Heat pump set with high exhaust temperature and CO2The latent heat is high and the drying efficiency is greatly enhanced because the latent heat is not condensed, thereby leading the temperature of the hot air outlet to reach more than 100 ℃.
Description
Technical Field
The utility model belongs to the technical field of sludge treatment, in particular to carbon dioxide heat pump sludge drying system.
Background
The sewage treatment can generate a large amount of sludge which is toxic and contains a large amount of organic matters, and how to treat the sludge in a harmless way becomes an important subject in China at present. The existing sludge treatment mode is mainly landfill and pollution-free incineration after drying. The sludge is treated by a landfill mode, so that land resources are wasted, and secondary pollution to the environment is caused. Therefore, harmless incineration of sludge is the most effective sludge treatment mode at present. Before incineration, sludge is usually pre-dried to reduce the water content to a certain range, so as to improve the combustion condition and achieve the purpose of harmless incineration. On the other hand, for enterprises, the sludge belongs to dangerous waste, the treatment cost is extremely high and the burden of the enterprises is increased by calculating according to the weight of the sludge, and the sludge drying equipment can effectively reduce the sludge and reduce the treatment cost.
The existing sludge drying equipment has multiple types, such as rotating disc type, flash evaporation type, blade type, heat pump type and other drying equipment, wherein the rotating disc type, the flash evaporation type, the blade type and the like all have the defects of high energy consumption and large heat loss, and the existing sludge heat pump drying equipment is a novel energy-saving sludge drying equipment, but the existing problems are that: the heating temperature of a common heat pump is lower, and can only reach about 70 ℃ generally, when the heat pump is used for drying sludge, the drying is not thorough due to the lower temperature, the moisture content of the dried sludge is still higher, and the sludge drying efficiency is low;
the traditional sludge drying equipment adopts a sludge pressing roller to roll a sludge cake to spread the sludge cake, but the sludge cannot be fully spread and thinly spread in the drying process by the method, the sludge is easy to form large blocks, the contact area of the sludge and hot air is small, the drying speed is slow, stink and harmful gas generated in the drying process are easy to overflow, the operating condition is poor, and the like, particularly, after the spread sludge surface is rapidly dried, hard skin is easily formed to prevent the water in the sludge from further volatilizing, if the sludge is not further crushed, the drying speed is reduced, and the heat utilization rate is reduced; the traditional sludge drying equipment adopts the conveying belt to convey sludge, not only occupies a large area, but also easily adheres to the conveying belt and even blocks a conveying channel because the sludge generally has certain viscosity; the conveying of the conveying belt can not only limit the flowing of the hot air and prevent the sludge and the hot air from forming strong convection, but also prevent the moisture volatilization of the contact part of the sludge and the conveying belt, reduce the drying rate and reduce the heat utilization rate.
SUMMERY OF THE UTILITY MODEL
The utility model discloses not enough and the defect to prior art exists, the utility model aims to provide a carbon dioxide heat pump sludge drying system.
The utility model provides a technical scheme that technical problem adopted as follows:
a carbon dioxide heat pump sludge drying system, the carbon dioxide heat pump sludge drying system includes: the sludge drying unit is used for drying sludge to obtain dried sludge and damp and hot air;
and the carbon dioxide heat pump unit is used for forming the damp and hot air flowing into the carbon dioxide heat pump unit from the sludge drying unit into dry high-temperature air, then returning the dry high-temperature air to the sludge drying unit, and the dry high-temperature air is used as a heat source for drying the sludge.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, the carbon dioxide heat pump unit is a supercritical carbon dioxide heat pump unit, and preferably, the working medium in the carbon dioxide heat pump unit is carbon dioxide.
In the above-mentioned carbon dioxide heat pump sludge drying system, as a preferred embodiment, the carbon dioxide heat pump unit includes an evaporator and a condenser, the evaporator is used for making CO flowing therein2The working medium exchanges heat with the damp and hot air flowing into the evaporator from the sludge drying unit, so that the damp and hot air releases heat and is cooled to form condensed water and dehumidified and cooled air; the condenser is used for flowing CO2The working medium exchanges heat with the dehumidified and cooled air flowing into the condenser from the evaporator, so that the dehumidified and cooled air absorbs heat and is heated to form the dry high-temperature air; preferably, the temperature of the high temperature air is 80 to 100 ℃.
In the above-mentioned carbon dioxide heat pump sludge drying system, as a preferred embodiment, the carbon dioxide heat pump unit further comprises CO2Compressor and throttle expander, said evaporator, CO2The compressor, the condenser and the throttling expander are sequentially connected end to form a carbon dioxide working medium circulation loop; wherein the low-temperature and low-pressure carbon dioxide gas absorbs the heat of the hot and humid air in the evaporator to form low-pressure carbon dioxide steam, and then passes through the CO2The compressor compresses the carbon dioxide steam into supercritical high-temperature high-pressure carbon dioxide steam, the carbon dioxide steam enters the condenser to be cooled into the high-temperature high-pressure carbon dioxide steam, the carbon dioxide steam forms low-temperature low-pressure carbon dioxide gas in the throttling expander, and the low-temperature low-pressure carbon dioxide gas returns to the evaporator; preferably, the temperature of the low-temperature low-pressure carbon dioxide gas is 40-50 ℃, and the pressure is 30-40 kg; preferably, the temperature of the high-temperature high-pressure carbon dioxide steam is 80-100 ℃, and the pressure is 85-95 kg.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, the evaporator is a finned evaporator, and the condenser is a finned condenser.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, the sludge drying unit includes a multistage hammerhead sludge dryer.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, the multistage hammer type sludge drying machine includes a housing and a plurality of rotary hammers located in the housing.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, the plurality of rotary hammers are arranged in the multistage hammer type sludge dryer in a staggered manner from top to bottom; preferably, the rotary hammer head comprises a rotor and a plurality of hammer heads arranged along the rotation direction of the rotor.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, the rotation direction of each rotary hammer head is opposite to the rotation direction of the adjacent rotary hammer head.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, the multistage hammer head type sludge dryer is provided with a sludge inlet, a sludge discharge port and a knife gate valve for controlling the opening of the sludge discharge port; preferably, a dried sludge collecting tank is arranged below the multistage hammer type sludge dryer and is used for collecting sludge discharged by the multistage hammer type sludge dryer.
In the above-mentioned carbon dioxide heat pump sludge drying system, as a preferred embodiment, multistage tup formula sludge drying machine top is equipped with the air outlet, and the bottom is equipped with the air intake, the air outlet pass through the tuber pipe with evaporimeter, condenser and air intake end to end in proper order, with the inside cavity of multistage tup formula sludge drying machine link up mutually and constitute hot-air circulation route jointly.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, an induced draft fan is arranged between the air outlet and the evaporator; preferably, a filter is arranged between the air outlet and the induced draft fan, and the filter is preferably an activated carbon filter.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, the carbon dioxide heat pump sludge drying system further includes a mud cake crusher and a screw conveyor, and the screw conveyor is used for conveying the mud cake crushed by the mud cake crusher into the sludge drying unit; preferably, a mud discharging hopper is arranged between the mud cake crusher and the screw conveyor.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, a driving shaft, a driven shaft and a milling cutter fixed on the driving shaft and the driven shaft are arranged in the mud cake crusher; preferably, the mud cake crusher is provided with a driving part for driving the driving shaft, and the driving part is preferably a motor.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, the screw conveyor is a shaftless screw conveyor.
In the above carbon dioxide heat pump sludge drying system, as a preferred embodiment, the draught fan and the high-temperature dry hot air forming pipeline are sequentially arranged between the air outlet and the air inlet.
Compared with the prior art, the utility model discloses following beneficial effect has:
(1) the utility model discloses mud gets into the desiccator again after mud cake rubbing crusher coarse cracking earlier, and multiplicable mud and hot-air area of contact reduce the subsequent processing difficulty, are favorable to the improvement of sludge drying efficiency.
(2) The utility model discloses a shaftless screw conveyer replaces the conveyer belt, has avoided mud adhesion and jam problem, and remaining moisture discharges from the bottom under the effect of gravity and spiral centrifugal force in the mud simultaneously, reduces the desiccator load.
(3) The utility model discloses behind the mud got into the desiccator, when dry, further make mud smash under the effect of the tup in the machine, the crust that makes the mud piece outer formation can in time be broken, fully improves mummification efficiency.
(4) The utility model discloses a multistage rotatory tup makes hot-blast and mud granule intensive mixing and form strong convection current, has improved sludge drying's efficiency greatly.
(5) The utility model adopts supercritical CO2Heat pump set with high exhaust temperature and CO2The latent heat is high and the drying efficiency is greatly enhanced because the latent heat is not condensed, thereby leading the temperature of the hot air outlet to reach more than 100 ℃.
(6) The utility model discloses desiccator sludge inlet and screw conveyer export seal are connected, and sludge outlet adopts the knife gate valve to seal, and the system forms confined air cycle, prevents that volatile stench and harmful gas from spilling over.
Drawings
Fig. 1 is a structural diagram of a carbon dioxide heat pump sludge drying system.
Wherein, 1 is the mud cake rubbing crusher, 2 is the mud discharging bucket, 3 is screw conveyer, 4 is multistage hammer head formula sludge drying machine, 5 is the mud entry, 6 is the heat preservation casing, 7 is the rotor, 8 is the tup, 9 is the knife gate valve, 10 is the air intake, 11 is the air outlet, 12 is the filter, 13 is the draught fan, 14 is the fin evaporator, 15 is the comdenstion water drip tray, 16 is the CO2 compressor, 17 is the throttle expander, 18 is the fin condenser, 19 is the mud discharging port, 20 is the drip tray, 21 is the mummified sludge collecting vat, 22 is the high temperature dry hot air formation pipeline.
Detailed Description
In order to highlight the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following embodiments, examples of which are provided by way of illustration rather than limitation of the present invention. The technical solution of the present invention is not limited to the following specific embodiments, but also includes any combination between the specific embodiments.
Referring to fig. 1, the utility model provides a carbon dioxide heat pump sludge drying system, which comprises a mud cake crusher 1, a screw conveyor 3, a sludge drying unit and a carbon dioxide heat pump unit (preferably a supercritical carbon dioxide heat pump unit); the mud cake crusher 1 is used for coarsely crushing mud cakes; the screw conveyor 3 is used for conveying the coarsely crushed mud cakes into the sludge drying unit; the sludge drying unit is used for drying the sludge fed into the sludge drying unit through the screw conveyor 3 to obtain dried sludge and damp and hot air; the supercritical carbon dioxide heat pump unit is used for forming the hot and humid air flowing into the supercritical carbon dioxide heat pump unit from the sludge drying unit into dry high-temperature air, then returning the dry high-temperature air to the sludge drying unit, and the dry high-temperature air is used as a heat source for drying the sludge.
As a preferred embodiment, a driving shaft, a driven shaft and a milling cutter fixed on the driving shaft and the driven shaft are arranged in the mud cake crusher 1; the mud cake crusher 1 is provided with a driving part for driving a driving shaft, and the driving part is preferably a motor; preferably, be provided with the mud bucket 2 that is located between mud cake rubbing crusher 1 and screw conveyer 3 in the below of mud cake rubbing crusher 1, mud cake rubbing crusher 1 can carry out preliminary crushing treatment to the mud after the pressure filter dehydration, wherein by the rotation of motor drive driving shaft, the driving shaft passes through precision gear simultaneously and drives the driven shaft and rotate, the messenger is fixed in diaxon milling cutter and is the reverse rotation, thereby make the crowded breakage of mud cake hank, the mud bucket 2 is passed through to the mud cake through preliminary kibbling, get into screw conveyer 3.
As a preferred embodiment, the screw conveyor 3 is a shaftless screw conveyor, the screw conveyor 3 adopts a shaftless center shaft design, has large torque, low rotating speed and stable operation, adopts a fully-closed conveying and easily-cleaned screw surface, and is suitable for conveying sludge with high water content and high viscosity.
Preferably, a drip tray 20 is arranged below the joint of the mud bucket 2 and the screw conveyor 3, water in the mud is squeezed out by the twisting force of the screw during the process that the mud cake is crushed in the mud cake crusher 1 and is conveyed upwards through the screw conveyor 3, and residual water in the mud cake is gathered to the bottom of the screw conveyor 3, namely the joint, under the action of gravity and is collected and discharged through the drip tray 20.
As a preferred embodiment, the sludge drying unit comprises a multi-stage hammer type sludge drying machine 4, the multi-stage hammer type sludge drying machine 4 comprises a heat-insulating housing 6 and a plurality of rotary hammers (e.g. 3, 4, 5, 6, 7, 8, etc., the number of rotary hammers is preferably even, so that the rotary hammers are paired hammers) positioned in the heat-insulating housing 6; the rotary hammers are arranged in a staggered manner from top to bottom in the multi-stage hammer type sludge drying machine 4; each rotary hammer head consists of a rotor 7 and a plurality of hammer heads 8 arranged along the rotation direction of the rotor. Every rotatory tup is high-speed rotatory simultaneously under the drive of motor, the direction of rotation of every rotatory tup is opposite with adjacent tup direction of rotation, mud is falling into multistage tup formula sludge drying machine 4 back, under high-temperature drying air's effect, the mud ectoderm is mummified rapidly by hot-air and forms the crust on the surface, the mud of outer mummification is after the rotatory tup of higher level breaks up, break up again by subordinate's reverse rotation's tup immediately, reverse collision each other between the mud granule simultaneously, hit and beat each other, through the in-process of multistage rotatory tup, the continuous mummification of mud forms the crust, the continuous quilt is constantly smashed again, the upset of mud granule relapse in 4 cavities of multistage tup formula sludge drying machine, smash and mummification. The utility model discloses in adopt a plurality of rotatory tups of crisscross arranging from top to bottom, make hot-blast and sludge granules intensive mixing and form strong convection current, improved sludge drying's efficiency greatly. In addition, the disturbance of the hot air in the sludge dryer 4 is strengthened by the rotating hammer head, and meanwhile, the sludge particles are continuously overturned under the action of the hammer head, so that the sludge is fully contacted with the hot air, and the drying efficiency is greatly improved. The shells of the two adjacent rotary hammers are communicated with each other and form a gourd shape, and the joint part becomes thin; furthermore, when viewed from the middle hammer head out of the two ends of the plurality of rotary hammer heads, a central connecting line between each middle hammer head and the hammer head at the upstream side thereof and a central connecting line between each middle hammer head and the hammer head at the downstream side thereof are not on the same line, and preferably form an angle, more preferably 90 degrees, between the two, and the central connecting line forms an angle, preferably 45 degrees, with the vertical line.
Preferably, 4 tops of multi-stage hammer head formula sludge drying machine have mud inlet 5, mud inlet 5 is linked together with screw conveyer 3, multi-stage hammer head formula sludge drying machine bottom has mud discharging port 19, and installation knife gate valve 9, through the upset of coarse crushing mud repetition in multi-stage hammer head formula sludge drying machine 4 with kibbling while being mummified, fall near mud discharging port 19 under the action of gravity at last, knife gate valve 9 is regularly opened, make the mummification mud of gathering discharge, the mummification mud collecting vat 21 of discharge hair formula sludge drying machine 4 below. The sludge inlet 5 is communicated with the opening of the shell where the first rotary hammer is positioned through a section of barrel part, preferably, sludge vertically falling from the sludge inlet 5 begins to incline downwards and roll into the heat-preservation shell 6 after meeting the barrel part, and then begins to be beaten by the hammer 8, namely, the axis of the sludge inlet 5 forms a certain included angle with the axis of the barrel part.
Preferably, the multistage hammer type sludge drying machine 4 is provided with an air outlet 11 at the top and an air inlet 10 at the bottom, wherein the air outlet 11 is arranged on the side wall of the barrel part, and the air inlet 10 is positioned on the extension line of the central lines of the last two rotary hammers.
As a preferred embodiment, the supercritical carbon dioxide heat pump unit comprises an evaporator and a condenser CO2A compressor 16 and a throttle expander 17, preferably the evaporator is a finned evaporator 14 and the condenser is a finned condenser 18; the fin-type evaporator 14 is used for exchanging heat with the hot and humid air flowing into the fin-type evaporator 14 from the multistage hammerhead sludge dryer 4, so that the hot and humid air releases heat and is cooled to form condensed water and dehumidified and cooled air; the finned condenser 18 is used for exchanging heat with the dehumidified and cooled air flowing into the finned condenser 18 from the finned evaporator 14, so that the dehumidified and cooled air absorbs heat and is heated to form dry high-temperature air; an air outlet 11 at the top of the multistage hammer type sludge drying machine 4 is sequentially connected with a filter 12, an induced draft fan 13, a fin type evaporator 14, a fin type condenser 18 and an air inlet 10 end to end through an air pipe, communicated with the inner cavity of the multistage hammer type sludge drying machine 4, and driven by the induced draft fan 13 to form closed hot air circulation. Preferably, the filter 12 disposed on the circulation pipeline is an activated carbon filter, which can not only adsorb malodorous and harmful gases volatilized from sludge, but also trap dust in the circulation pipeline.
The coarsely crushed sludge is subjected to heat-mass exchange with hot air generated by a high-temperature carbon dioxide heat pump unit in a cavity 4 of the multi-stage hammer type sludge dryer so as to be dried. In the process, the outer surface of the sludge is quickly dried by hot air and forms a hard skin on the surface, then the hard skin on the surface layer is quickly crushed by the rotary hammer head, so that the interior of wet sludge particles can continuously contact with the hot air to form a continuous deep drying effect, the rotary hammer head drives the sludge particles and the hot air to be continuously overturned and stirred to form strong convective heat and mass exchange, moisture in the sludge is volatilized and enters the hot air, and the moisture content of the hot air is increased to form the wet hot air.
Preferably, finned evaporator 14, CO2The compressor 16, the finned condenser 18 and the throttling expander 17 are sequentially connected end to form a carbon dioxide working medium circulation loop; wherein the low-temperature and low-pressure carbon dioxide gas absorbs the heat of the hot and humid air in the evaporator to form low-pressure carbon dioxide steam, and then passes through the CO2The compressor compresses the carbon dioxide steam into supercritical high-temperature high-pressure carbon dioxide steam, then the carbon dioxide steam enters the condenser to be cooled into the high-temperature high-pressure carbon dioxide steam, the carbon dioxide steam forms low-temperature low-pressure carbon dioxide gas in the throttling expander, and the low-temperature low-pressure carbon dioxide gas returns to the evaporator.
In particular, finned evaporator 14, CO2The compressor 16, the finned condenser 18 and the throttling expander 17 are sequentially connected end to end through pipelines, and carbon dioxide is used as a refrigerant to form a high-temperature carbon dioxide heat pump unit. The utility model uses carbon dioxide to replace Freon as refrigerant, which not only has remarkable environmental protection benefit, but also the carbon dioxide heat pump belongs to supercritical cycle, which has excellent thermodynamic property, high thermal efficiency, low compression ratio and high exhaust temperature, the heating temperature can reach more than 100 ℃, thereby greatly improving the efficiency of sludge drying;
the finned evaporator 14 and the hot and humid air from the cavity of the multistage hammer type sludge dryer 4 are subjected to heat and mass exchange, the temperature of the heat released by the hot and humid air is reduced, the moisture in the air is condensed, the condensed water is collected and discharged by a condensed water drip tray 15 positioned below the finned evaporator 14, the carbon dioxide refrigerant absorbs the heat in the hot and humid air, and the heat is generated by low-temperature low-pressure gas-liquid two-phase CO2The working medium absorbs heat and evaporates to become low-pressure steam, and the low-pressure steam is compressed into high-temperature high-pressure carbon dioxide steam by the carbon dioxide compressor 16Then enters the finned condenser 18;
the finned condenser 18 and the air dehumidified and cooled by the finned evaporator 14 perform heat and mass exchange, the air absorbs heat, the temperature rises, the air is heated to be high-temperature dry air, the air returns to the multistage hammerhead type sludge drying machine 4 through the air inlet 10, high-temperature and high-pressure carbon dioxide steam in the finned condenser 18 is in a supercritical state, temperature slippage occurs in the heat release process, a large amount of heat is released, the temperature of the high-pressure carbon dioxide steam is reduced, the high-temperature and high-pressure carbon dioxide steam is changed into low-temperature and low-pressure carbon dioxide gas through the throttling expander 17, and the low-temperature and high-pressure carbon dioxide steam returns to the finned evaporator 14, so that the supercritical carbon dioxide heat pump circulation is formed.
Structurally, an induced draft fan 13 and a high-temperature dry hot air forming pipeline 22 (also called as an air heat exchange pipeline) are sequentially arranged between an air outlet 11 and an air inlet 10 of the multistage hammer type sludge drying machine 4. The inlet of the induced draft fan 13 is connected with the air outlet 11 through an air pipe, the air pipe is a section of obtuse-angle bent pipeline, a filter 12 is arranged in the pipeline, and the filter 12 is preferably arranged at the pipeline section close to the induced draft fan 13. An outlet of the induced draft fan 13 is connected with a high-temperature dry hot air forming pipeline 22, a finned evaporator 14 is arranged inside one end, close to the induced draft fan 13, of the high-temperature dry hot air forming pipeline 22, a finned condenser 18 is arranged inside one end, close to the air inlet 10, of the high-temperature dry hot air forming pipeline 22, and a pipeline between the finned evaporator 14 and the finned condenser 18 is an air pipe, so that the finned evaporator 14 discharges condensed water; preferably, the pipe between the finned evaporator 14 and the finned condenser 18 is formed with a section in the shape of a 7. A carbon dioxide compressor 16 is connected and arranged between the outlet of the finned evaporator 14 and the inlet of the finned condenser 18 through a pipeline, a throttling expander 17 is connected and arranged between the outlet of the finned condenser 18 and the inlet of the finned evaporator 14 through a pipeline, and the finned evaporator 14, the carbon dioxide compressor 16, the throttling expander 17 and the finned condenser 18 form a high-temperature carbon dioxide heat pump unit.
The above embodiments describe the basic principles, main features and advantages of the present invention, and those skilled in the art should understand that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only for illustration of the principles of the present invention, without departing from the scope of the present invention, the present invention can also have various changes and improvements, and these changes and improvements all fall into the protection scope of the present invention.
Claims (10)
1. The carbon dioxide heat pump sludge drying system is characterized by comprising: the sludge drying unit is used for drying sludge to obtain dried sludge and damp and hot air;
and the carbon dioxide heat pump unit is used for forming the damp and hot air flowing into the carbon dioxide heat pump unit from the sludge drying unit into dry high-temperature air, then returning the dry high-temperature air to the sludge drying unit, and the dry high-temperature air is used as a heat source for drying the sludge.
2. The carbon dioxide heat pump sludge drying system of claim 1, wherein the carbon dioxide heat pump unit is a supercritical carbon dioxide heat pump unit, and the working medium in the carbon dioxide heat pump unit is carbon dioxide.
3. The carbon dioxide heat pump sludge drying system of claim 1, wherein the carbon dioxide heat pump unit comprises an evaporator and a condenser, the evaporator is used for enabling CO flowing in the evaporator to flow in2The working medium exchanges heat with the damp and hot air flowing into the evaporator from the sludge drying unit, so that the damp and hot air releases heat and is cooled to form condensed water and dehumidified and cooled air; the condenser is used for flowing CO2And the working medium exchanges heat with the dehumidified and cooled air flowing into the condenser from the evaporator, so that the dehumidified and cooled air absorbs heat and is heated to form the dry high-temperature air.
4. The carbon dioxide heat pump sludge drying system of claim 3, wherein the carbon dioxide heat pump unit further comprises CO2Compressor and throttle expander, said evaporator, CO2The compressor, the condenser and the throttling expander are sequentially connected end to form a carbon dioxide working medium circulation loop; wherein the low-temperature and low-pressure carbon dioxide gas absorbs the heat of the hot and humid air in the evaporator to form low-pressure carbon dioxide steam, and then passes through the CO2The compressor compresses the carbon dioxide steam into supercritical high-temperature high-pressure carbon dioxide steam, then the carbon dioxide steam enters the condenser to be cooled into the high-temperature high-pressure carbon dioxide steam, the carbon dioxide steam forms low-temperature low-pressure carbon dioxide gas in the throttling expander, and the low-temperature low-pressure carbon dioxide gas returns to the evaporator.
5. The carbon dioxide heat pump sludge drying system of claim 3, wherein the sludge drying unit comprises a multi-stage hammerhead sludge dryer; the multistage hammer type sludge drying machine comprises a shell and a plurality of rotary hammers positioned in the shell.
6. The carbon dioxide heat pump sludge drying system of claim 5, wherein the plurality of rotary hammers are staggered from top to bottom within the multistage hammer-head sludge dryer; the rotary hammer head comprises a rotor and a plurality of hammer heads arranged along the rotation direction of the rotor; the rotating direction of each rotating hammer head is opposite to that of the adjacent rotating hammer head.
7. The carbon dioxide heat pump sludge drying system of claim 5, wherein the multistage hammerhead sludge dryer is provided with a sludge inlet, a sludge discharge port and a knife gate valve for controlling the opening of the sludge discharge port; and a dried sludge collecting tank is arranged below the multistage hammer type sludge dryer and is used for collecting sludge discharged by the multistage hammer type sludge dryer.
8. The carbon dioxide heat pump sludge drying system of claim 5, wherein an air outlet is formed in the top of the multistage hammerhead type sludge drying machine, an air inlet is formed in the bottom of the multistage hammerhead type sludge drying machine, the air outlet is sequentially connected with the evaporator, the condenser and the air inlet end to end through air pipes, and the air outlet is communicated with an inner cavity of the multistage hammerhead type sludge drying machine to form a hot air circulation passage;
an induced draft fan is arranged between the air outlet and the evaporator; a filter is arranged between the air outlet and the induced draft fan;
the draught fan and the high-temperature dry hot air forming pipeline are sequentially arranged between the air outlet and the air inlet.
9. The carbon dioxide heat pump sludge drying system of claim 1, further comprising a sludge cake crusher and a screw conveyor, wherein the screw conveyor is used for feeding the sludge cake crushed by the sludge cake crusher into the sludge drying unit;
a mud discharging hopper is arranged between the mud cake crusher and the screw conveyor;
a driving shaft, a driven shaft and a milling cutter fixed on the driving shaft and the driven shaft are arranged in the mud cake crusher; the mud cake crusher is provided with a driving part for driving the driving shaft; the screw conveyer is a shaftless screw conveyer.
10. The carbon dioxide heat pump sludge drying system of claim 5,
the shells of the two adjacent rotary hammers are communicated with each other and form a gourd shape, and the joint part becomes thin;
when viewed from the middle hammerheads except the two ends of the plurality of rotary hammerheads, a central connecting line between each middle hammerhead and the hammerhead at the upstream of the middle hammerhead and a central connecting line between each middle hammerhead and the hammerhead at the downstream of the middle hammerhead are not on the same line;
the center connecting line and the plumb line form a certain angle.
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| CN202120205038.8U CN214528655U (en) | 2021-01-25 | 2021-01-25 | Carbon dioxide heat pump sludge drying system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115403231A (en) * | 2022-09-01 | 2022-11-29 | 昆明明书科技有限公司 | Flexible mummification production line of super supercritical low carbon heat source of mud |
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2021
- 2021-01-25 CN CN202120205038.8U patent/CN214528655U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115403231A (en) * | 2022-09-01 | 2022-11-29 | 昆明明书科技有限公司 | Flexible mummification production line of super supercritical low carbon heat source of mud |
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