CN112629162A - Overlapping parallel secondary air supply sludge heat pump belt type drying unit - Google Patents
Overlapping parallel secondary air supply sludge heat pump belt type drying unit Download PDFInfo
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- CN112629162A CN112629162A CN202011631442.8A CN202011631442A CN112629162A CN 112629162 A CN112629162 A CN 112629162A CN 202011631442 A CN202011631442 A CN 202011631442A CN 112629162 A CN112629162 A CN 112629162A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
- F26B1/005—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids by means of disintegrating, e.g. crushing, shredding, milling the materials to be dried
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
- F26B17/02—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces
- F26B17/04—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed by belts carrying the materials; with movement performed by belts or elements attached to endless belts or chains propelling the materials over stationary surfaces the belts being all horizontal or slightly inclined
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/004—Nozzle assemblies; Air knives; Air distributors; Blow boxes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/086—Humidity by condensing the moisture in the drying medium, which may be recycled, e.g. using a heat pump cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/18—Sludges, e.g. sewage, waste, industrial processes, cooling towers
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a belt type drying unit of a cascade parallel secondary air supply sludge heat pump, which comprises a return air duct, a primary air supply duct, a secondary air supply duct, an air circulation processing system, a secondary heat pump system, a sludge processing system and a primary refrigeration heat pump system; an axial flow return air fan, a secondary air supply fan and a primary air supply fan in the air circulation processing system are combined to realize air circulation, and primary and secondary air supply amount is distributed through a return air distributing valve and the secondary air supply fan; the primary refrigeration heat pump system and the secondary heat pump system are arranged in a superposed manner and are used for processing circulating air in the primary air supply duct and the secondary air supply duct in parallel; the air circulation processing system also comprises a primary wind supply electric heater and a secondary wind supply electric heater. The invention can distribute the air quantity of secondary air supply, improve the sludge drying speed of the unit and shorten the drying period of the sludge heat pump drying unit.
Description
Technical Field
The invention belongs to the field of crossing of a refrigeration heat pump technology and a drying mechanical equipment technology, and particularly relates to a belt type drying unit of a overlapped parallel secondary air supply sludge heat pump.
Background
Research results show that three stages of acceleration, constant speed and deceleration exist in the sludge drying process. The sludge drying initial stage is a pre-drying acceleration stage, the sludge at normal temperature has a large temperature difference with hot air, the sludge absorbs heat and rises in temperature at a high speed, moisture in the sludge begins to absorb heat and gasify, the moisture escaping from the sludge at the stage is mainly free water on the surface of the sludge, and the influence of wind speed, wind quantity and wind temperature on the sludge drying speed at the stage is prominent; the method comprises the following steps that (1) as the temperature difference between sludge and hot air is continuously reduced, heat transfer tends to be stable, the moisture gasification rate also tends to be stable, and a constant-speed drying stage is entered, wherein the air quantity, the air speed and the air temperature have a great influence on the sludge drying speed; as the content of free water in the sludge is less and less, the gap water begins to evaporate, the gap water and the sludge are combined tightly, the gasification needs to absorb more heat, the evaporation speed is reduced, the sludge enters a speed reduction drying stage, and the influence of the moisture content and the temperature of air on the sludge drying speed is larger in the stage.
At present, common sludge heat pump drying units are single air supply, and the design that the air supply outlet is arranged in the middle part is occasionally seen, but the middle air supply is not heated, and the mixed air is not redistributed, so that the sludge drying period is long, the time consumed by sludge from entering a drying chamber to leaving is counted in hours, and the sludge drying efficiency is low.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a belt type drying unit of a sludge heat pump with overlapped parallel secondary air supply, which has the functions of middle air supply heating treatment and mixed air redistribution and improves the drying speed of sludge.
The technical scheme is as follows: the air conditioner comprises a circulating air duct, wherein the circulating air duct comprises a return air duct arranged on the upper layer of a unit, a secondary air supply duct arranged on the middle layer of the unit and a primary air supply duct arranged on the lower layer; the system also comprises an air circulation treatment system, a secondary heat pump system, a sludge treatment system and a primary refrigeration heat pump system; the air circulation processing system comprises an axial flow return air fan arranged at an inlet of a return air duct, a return air distributing valve positioned at a lower inlet of a secondary air supply duct, a secondary air supply fan arranged at an outlet of the secondary air supply duct and a primary air supply fan arranged at an outlet of a primary air supply duct; the axial flow return air fan, the secondary air supply fan and the primary air supply fan are combined to realize air circulation, and the air volume of primary air supply and secondary air supply is distributed through the return air distributing valve and the secondary air supply fan; the primary refrigeration heat pump system is positioned in the primary air supply duct, the secondary heat pump system is positioned in the secondary air supply duct, and the primary refrigeration heat pump system and the secondary heat pump system are arranged in a superposed manner and are used for processing circulating air in the primary air supply duct and the secondary air supply duct in parallel; the air circulation processing system also comprises a primary air supply electric heater arranged on the side, close to the outlet side of the channel, of the primary refrigeration heat pump system and a secondary air supply electric heater arranged on the side, close to the outlet side of the channel, of the secondary refrigeration heat pump system.
An air outlet of the axial flow air return fan is provided with a primary filter and a middle filter, the primary filter is used for coarse filtration of return air and separation of large-particle sludge possibly mixed in the primary filter; the intermediate-efficiency filter is used for secondary filtration of return air, and prevents sludge impurities in the return air from polluting an air duct and a heat exchanger.
The inlet of the primary air supply air channel is provided with the surface cooler for precooling primary air supply, so that the refrigeration load of the primary refrigeration heat pump system can be reduced, or deep dehumidification of primary air supply can be realized, and the overall operation efficiency of the system can be improved.
The secondary heat pump system comprises a secondary compressor, a secondary condenser, a secondary liquid storage device, a secondary drying filter, a secondary expansion valve, an evaporative condenser and a secondary gas-liquid separator which are sequentially connected, wherein the secondary condenser is arranged on the left side of the secondary air supply electric heater and can heat air.
A secondary high-pressure gauge, a secondary needle valve and a secondary high-pressure controller are arranged between the secondary compressor and the secondary condenser, so that the exhaust pressure of the secondary compressor can be monitored in real time, and safety control protection is provided.
A secondary ball valve is arranged between the secondary liquid storage device and the secondary drying filter and used for cutting off a refrigerant flow path in the cleaning and replacing processes of the secondary drying filter; and a secondary electromagnetic valve is arranged between the secondary drying filter and the secondary expansion valve, so that the flow of the refrigerant can be cut off when the machine is stopped.
The one-level refrigeration heat pump system comprises a one-level compressor, a one-level condenser, an evaporative condenser, a one-level liquid storage device, a one-level dry filter, a one-level expansion valve, a one-level evaporator and a one-level gas-liquid separator which are sequentially connected, wherein the one-level condenser is arranged on the left side of the one-time air supply electric heater, and can deeply cool and dehumidify air through the one-level evaporator and then reheat the air.
A first-level high-pressure gauge, a first-level needle valve and a first-level high-pressure controller are sequentially arranged between the first-level compressor and the first-level condenser, the exhaust pressure of the first-level compressor can be monitored in real time, and safety control protection is provided.
The sludge treatment system comprises a plurality of sludge conveying belts which are arranged in a parallel and staggered manner, and the running directions of two adjacent layers of sludge conveying belts are opposite; the sludge conveying belt is provided with a plurality of meshes, so that circulating air can conveniently pass through the sludge conveying belt.
A sludge forming slitter is arranged at the upper right part of the top layer of the sludge conveying belt; a primary air supply uniform flow device is arranged below the bottom layer of the sludge conveying belt; and a mixing flow equalizer is arranged above the outlet of the secondary air supply duct in the middle layer of the sludge conveying belt and is used for mixing and equalizing the primary air supply and the secondary air supply.
Has the advantages that: compared with the prior art, the invention has the beneficial effects that: according to the method, air parameters have different influence degrees on the sludge when the sludge is in different drying stages, so that secondary distribution, treatment and optimization of air supply are performed, the sludge drying speed of the sludge heat pump drying unit is improved, and the problems of long drying period and low overall drying efficiency of the existing sludge heat pump drying unit are solved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and the attached drawings.
As shown in fig. 1, the present invention includes a circulation air duct, an air circulation processing system, a secondary heat pump system, a sludge processing system and a primary refrigeration heat pump system, wherein the circulation air duct includes a return air duct disposed on the upper layer of the unit, a secondary air supply duct disposed on the middle layer of the unit, and a primary air supply duct disposed on the lower layer.
The air circulation processing system comprises an air return air distribution valve 101, a secondary air supply electric heater 102, an intermediate efficiency filter 103, a primary filter 104, an axial flow air return fan 105, a secondary air supply fan 106, a primary air supply flow equalizer 107, a mixing flow equalizer 108, a primary air supply fan 109, a primary air supply electric heater 110, a drip tray 111 and a surface air cooler 112. The return air distributing valve 101 is located at the inlet below the secondary air supply duct, the secondary air supply fan 106 is arranged at the outlet of the secondary air supply duct, the secondary air supply fan 106 is used for secondary air supply from the middle part of the sludge drying chamber, and the power adjustment of the secondary air supply fan is one of measures for realizing return air volume distribution. The air volume of the primary air supply and the air volume of the secondary air supply are distributed through the air return air distributing valve 101 and the secondary air supply fan 106, and the primary air supply volume and the secondary air supply volume need to be adjusted and optimized in the sludge drying process with different moisture contents and different properties. The secondary air supply electric heater 102 is arranged on the outlet side of the channel of the secondary heat pump system, the heating capacity is adjustable, and the temperature of secondary air supply needs to be adjusted and optimized in the sludge drying process with different moisture contents and different properties. The axial flow return air fan 105 is arranged at an inlet of a return air duct, belongs to power equipment for air circulation, and sucks air from a sludge drying chamber into the air duct to start a treatment process. An air outlet of the axial flow return air fan 105 is provided with a primary filter 104 and a medium-efficiency filter 103, wherein the primary filter 104 is used for the coarse filtration of return air and separating large-particle sludge possibly mixed in the primary filter 104; the intermediate filter 103 is used for secondary filtration of return air to prevent sludge impurities in the return air from polluting an air duct and a heat exchanger. The primary air supply flow equalizer 107 is used for equalizing flow of primary air supply, ensures that the primary air supply can be uniformly distributed, and realizes consistency of later-stage sludge drying effect. The mixing flow equalizer 108 is used for mixing and equalizing primary and secondary air supply, ensures that the mixed air can be uniformly distributed, and realizes the consistency of the sludge pre-and mid-term drying effect. The primary air supply fan 109 is arranged at the outlet of the primary air supply duct and used for supplying air from the bottom of the unit for the first time. The axial flow return air fan 105, the secondary air supply fan 106 and the primary air supply fan 109 together form a power source for air circulation of the unit. The primary air supply electric heater 110 is arranged on the side, close to the outlet side of the channel, of the primary refrigeration heat pump system, the heating quantity of the primary air supply electric heater 110 is adjustable, and the primary air supply electric heater is used for adjusting the temperature of primary air supply in different drying working conditions and ensuring the drying effect in the later stage of sludge. The drip trays 111 are arranged below the primary air supply duct, the number of the drip trays is two, the drip trays are used for collecting condensed water during primary air supply, cooling and dehumidification, a pressure difference automatic drainage device is adopted, the liquid sealing effect is achieved in the automatic drainage process, and the air leakage problem in the drainage process is avoided. The surface cooler 112 is arranged at the inlet of the primary air supply duct and used for precooling primary air supply, so that the refrigeration load of the primary refrigeration heat pump system is reduced, the deep dehumidification of the primary air supply is realized, and the overall operation efficiency of the system can be improved.
The secondary heat pump system is positioned in the secondary air supply duct and comprises a secondary compressor 201, a secondary low-pressure meter 202, a secondary needle valve 203, a secondary gas-liquid separator 204, a secondary high-pressure meter 205, a secondary high-pressure controller 206, a secondary high-pressure controller 207, an evaporative condenser 208, a secondary expansion valve 209, a secondary electromagnetic valve 210, a secondary drying filter 211, a secondary ball valve 212, a secondary reservoir 213 and a secondary condenser 214. The secondary compressor 201, the secondary condenser 214, the secondary reservoir 213, the secondary drying filter 211, the secondary expansion valve 209, the evaporative condenser 208, and the secondary gas-liquid separator 204 are connected in sequence to realize secondary heat pump circulation, wherein the secondary condenser 214 is arranged on the left side of the secondary air supply electric heater 102, and the secondary condenser 214 is in a tube fin type and is used for heating secondary air supply to improve the temperature of the secondary air supply. A second-stage high-pressure gauge 205, a second-stage needle valve 203 and a second-stage high-pressure controller 207 are arranged between the second-stage compressor 201 and the second-stage condenser 214, the second-stage high-pressure gauge 205 is used for monitoring the exhaust pressure of the second-stage compressor 201, and the second-stage high-pressure controller 207 realizes the safety control protection of the exhaust pressure of the second-stage compressor 201. The evaporative condenser 208 is of a plate type. A secondary ball valve 212 is arranged between the secondary accumulator 213 and the secondary drying filter 211 and is used for cutting off a refrigerant flow path in the cleaning and replacing processes of the secondary drying filter 211. A two-stage solenoid valve 210 is provided between the two-stage dry filter 211 and the two-stage expansion valve 209, and the flow of refrigerant is shut off at the time of shutdown. A secondary low pressure gauge 202 is arranged between the secondary gas-liquid separator 204 and the secondary compressor 201 and is used for monitoring the suction pressure of the secondary compressor 201. The inlet and outlet of the secondary compressor 201 are provided with secondary high and low pressure controllers 2-06 to realize the safety control of the air suction and exhaust pressure.
The sludge treatment system comprises a sludge cleaning brush 301, a sludge conveying belt 302, a sludge diversion trench 303, a sludge forming slitter 304 and a dry sludge conveyor 305. The sludge cleaning brush 301 is in contact with the sludge conveying belt 302 and is used for cleaning sludge adhered to the sludge conveying belt 302, and can shield the sludge from the upper conveying belt and the lower conveying belt when the sludge falls from the upper conveying belt, so that the sludge is prevented from falling from the sludge conveying belt 302 in the process. The sludge conveying belts 302 are arranged in parallel in a staggered manner, and the running directions of two adjacent layers of sludge conveying belts are opposite; in this embodiment, the sludge conveying belt adopts four layers of three-dimensional settings, and two liang of them are located the upper and lower side of secondary air supply export respectively. The sludge conveying belt 302 is provided with a plurality of meshes for circulating air to pass through. Because the distance of two adjacent layer mud conveyer belts is great relatively in the middle of the secondary air supply design leads to, adopt mud guiding gutter 303 can prevent to be in the mud raise dust in mummification later stage, and mud guiding gutter 303 is located the right side of two middle mud conveyer belts. The sludge forming slitting machine 304 is arranged on the right upper side of the sludge conveying belt 302 and used for forming slitting of sludge, and the optimal heat and mass transfer effect between the sludge and circulating air can be realized through scientific and reasonable shape cutting. The lower right side of the sludge conveying belt 302 is provided with a dry sludge conveyor 305 for conveying after the sludge drying process is finished, and the spiral structure design of the dry sludge conveyor can prevent air leakage in the dry sludge conveying process. A primary air supply uniform flow device 107 is arranged below the sludge conveying belt 302. The mixing and flow-equalizing device 108 is arranged above the outlet of the secondary air supply duct in the middle layer of the sludge conveying belt 302 and is used for mixing and equalizing the primary air supply and the secondary air supply.
Sludge enters the sludge drying chamber from a sludge forming slitter 304 at the top of the unit, naturally falls on the sludge conveying belt 302 due to gravity, and flows to the bottom from the top of the drying chamber along with the sludge conveying belt 302, the drying process is realized by heat and mass transfer with circulating air in the process, and finally the sludge leaves the drying chamber through a dry sludge conveyor 305 at the bottom of the drying chamber.
The primary refrigeration heat pump system is positioned in the primary air supply duct, and the primary refrigeration heat pump system and the secondary heat pump system are arranged in a superposed mode and are used for processing circulating air in the primary air supply duct and the secondary air supply duct in parallel. The primary refrigeration heat pump system comprises a primary condenser 401, a primary high-pressure controller 402, a primary needle valve 403, a primary high-pressure meter 404, a primary compressor 405, a primary low-pressure meter 406, a primary high-low pressure controller 407, a primary gas-liquid separator 408, a primary evaporator 409, a primary expansion valve 410, a primary ball valve 411, a primary reservoir 412, a primary drying filter 413 and a primary electromagnetic valve 414. The primary compressor 405, the primary condenser 401, the evaporative condenser 208, the primary reservoir 412, the primary filter-drier 413, the primary expansion valve 410, the primary evaporator 409 and the primary gas-liquid separator 408 are connected in sequence to realize the primary refrigeration heat pump cycle, wherein the primary condenser 401 is arranged on the left side of the primary air supply electric heater 110. A first-stage high-pressure gauge 404, a first-stage needle valve 403 and a first-stage high-pressure controller 402 are sequentially arranged between the first-stage compressor 405 and the first-stage condenser 401, the first-stage high-pressure gauge 404 is used for monitoring the exhaust pressure of the first-stage compressor 405, and the first-stage high-pressure controller 402 is used for safety control of the exhaust pressure of the first-stage compressor 405. The primary evaporator 409 is of a tube fin type and is used for cooling and dehumidifying primary air supply. A primary ball valve 411 is arranged between the primary accumulator 412 and the primary filter-drier 413 and used for cutting off a refrigerant flow path in the cleaning and replacing processes of the primary filter-drier 413. A primary low pressure gauge 406 is provided between the primary gas-liquid separator 408 and the primary compressor 405 for monitoring the suction pressure of the primary compressor 405. A first-stage high-low pressure controller 407 is arranged at an inlet and an outlet of the first-stage compressor 405 to realize the safety control of the suction and exhaust pressure.
The working process of the invention is as follows: the axial flow return air fan 105 sucks air from the sludge drying chamber into the return air duct, and after passing through the primary filter 104 and the intermediate filter 103 in sequence, the air volume is distributed by the opening degree of the return air distributing valve 101 and the secondary air supply fan 106. A part of return air passes through a secondary air supply duct in the middle, is heated by a secondary condenser 214 and a secondary air supply electric heater 102 of a secondary heat pump system, and then is sent into a sludge drying chamber through a secondary air supply fan 106; the other part of return air passes through the return air distributing valve 101 downwards, then passes through the surface air cooler 112 and the primary evaporator 409 of the primary refrigeration heat pump system in sequence to realize cooling and dehumidification, then passes through the primary condenser 401 of the primary refrigeration heat pump system and the primary air supply electric heater 110 to realize reheating, and the heated dry air is sent into the sludge drying chamber from the bottom by the primary air supply fan 109. The primary air supply and the secondary air supply are mixed in the middle of the sludge drying chamber, and the sludge on the upper part of the sludge drying chamber is continuously dried, so that the requirements of the sludge with high moisture content on large air volume and high air temperature are met.
Claims (10)
1. The utility model provides a compound parallelly connected secondary air supply mud heat pump belt mummification unit which characterized in that: the air conditioner comprises a circulating air duct, wherein the circulating air duct comprises a return air duct arranged on the upper layer of a unit, a secondary air supply duct arranged on the middle layer of the unit and a primary air supply duct arranged on the lower layer; the system also comprises an air circulation treatment system, a secondary heat pump system, a sludge treatment system and a primary refrigeration heat pump system;
the air circulation processing system comprises an axial flow return air fan (105) arranged at an inlet of a return air duct, a return air distributing valve (101) positioned at a lower inlet of a secondary air supply duct, a secondary air supply fan (106) arranged at an outlet of the secondary air supply duct and a primary air supply fan (109) arranged at an outlet of a primary air supply duct; the axial flow return air fan (105), the secondary air supply fan (106) and the primary air supply fan (109) are combined to realize air circulation, and the air volume of primary air supply and secondary air supply is distributed through the return air distributing valve (101) and the secondary air supply fan (106);
the primary refrigeration heat pump system is positioned in the primary air supply duct, the secondary heat pump system is positioned in the secondary air supply duct, and the primary refrigeration heat pump system and the secondary heat pump system are arranged in a superposed manner and are used for processing circulating air in the primary air supply duct and the secondary air supply duct in parallel; the air circulation processing system also comprises a primary air supply electric heater (110) arranged on the side, close to the outlet side of the channel, of the primary refrigeration heat pump system, and a secondary air supply electric heater (102) arranged on the side, close to the outlet side of the channel, of the secondary refrigeration heat pump system.
2. The overlapping parallel secondary air supply sludge heat pump belt type drying unit as claimed in claim 1, wherein: and an air outlet of the axial flow return air fan (105) is provided with a primary filter (104) and a medium-efficiency filter (103).
3. The overlapping parallel secondary air supply sludge heat pump belt type drying unit as claimed in claim 1, wherein: and a surface cooler (112) is arranged at the inlet of the primary air supply duct.
4. The overlapping parallel secondary air supply sludge heat pump belt type drying unit as claimed in claim 1, wherein: the secondary heat pump system comprises a secondary compressor (201), a secondary condenser (214), a secondary liquid storage device (213), a secondary drying filter (211), a secondary expansion valve (209), an evaporative condenser (208) and a secondary gas-liquid separator (204) which are connected in sequence, wherein the secondary condenser (214) is arranged on the left side of the secondary air supply electric heater (102).
5. The overlapping parallel secondary air supply sludge heat pump belt type drying unit as claimed in claim 4, wherein: and a second-stage high-pressure gauge (205), a second-stage needle valve (203) and a second-stage high-pressure controller (207) are arranged between the second-stage compressor (201) and the second-stage condenser (214).
6. The overlapping parallel secondary air supply sludge heat pump belt type drying unit as claimed in claim 4, wherein: a secondary ball valve (212) is arranged between the secondary reservoir (213) and the secondary drying filter (211) and is used for cutting off a refrigerant flow path in the cleaning and replacing processes of the secondary drying filter (211); a second-stage electromagnetic valve (210) is arranged between the second-stage drying filter (211) and the second-stage expansion valve (209).
7. The overlapping parallel secondary air supply sludge heat pump belt type drying unit as claimed in claim 1, wherein: the primary refrigeration heat pump system comprises a primary compressor (405), a primary condenser (401), an evaporative condenser (208), a primary liquid storage device (412), a primary drying filter (413), a primary expansion valve (410), a primary evaporator (409) and a primary gas-liquid separator (408), wherein the primary condenser (401) is arranged on the left side of the primary air supply electric heater (110).
8. The overlapping parallel secondary air supply sludge heat pump belt type drying unit as claimed in claim 7, wherein: a first-level high-pressure gauge (404), a first-level needle valve (403) and a first-level high-pressure controller (402) are sequentially arranged between the first-level compressor (405) and the first-level condenser (401).
9. The overlapping parallel secondary air supply sludge heat pump belt type drying unit as claimed in claim 1, wherein: the sludge treatment system comprises a plurality of sludge conveying belts (302) which are arranged in a parallel staggered manner, and the running directions of two adjacent layers of sludge conveying belts are opposite; the sludge conveying belt (302) is provided with a plurality of meshes.
10. The overlapping parallel secondary air supply sludge heat pump belt type drying unit as claimed in claim 1, wherein: a sludge forming slitter (304) is arranged at the upper right part of the sludge conveying belt (302), and a dry sludge conveyor (305) is arranged at the lower right part of the sludge conveying belt (302); a primary air supply uniform flow device (107) is arranged below the sludge conveying belt (302); and a mixing flow equalizer (108) is arranged above the outlet of the secondary air supply duct in the middle layer of the sludge conveying belt (302) and is used for mixing and equalizing the primary air supply and the secondary air supply.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011631442.8A CN112629162A (en) | 2020-12-31 | 2020-12-31 | Overlapping parallel secondary air supply sludge heat pump belt type drying unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011631442.8A CN112629162A (en) | 2020-12-31 | 2020-12-31 | Overlapping parallel secondary air supply sludge heat pump belt type drying unit |
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| CN112629162A true CN112629162A (en) | 2021-04-09 |
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| CN202011631442.8A Pending CN112629162A (en) | 2020-12-31 | 2020-12-31 | Overlapping parallel secondary air supply sludge heat pump belt type drying unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477702A (en) * | 2021-12-30 | 2022-05-13 | 江苏博一环保科技有限公司 | Sludge drying system with automatic dust removal device |
| CN114560616A (en) * | 2022-03-17 | 2022-05-31 | 江苏博一环保科技有限公司 | Heat pump type belt low-temperature sludge drying machine |
-
2020
- 2020-12-31 CN CN202011631442.8A patent/CN112629162A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114477702A (en) * | 2021-12-30 | 2022-05-13 | 江苏博一环保科技有限公司 | Sludge drying system with automatic dust removal device |
| CN114560616A (en) * | 2022-03-17 | 2022-05-31 | 江苏博一环保科技有限公司 | Heat pump type belt low-temperature sludge drying machine |
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