CN113371971B - Heat pump sludge drying system and sludge drying equipment - Google Patents
Heat pump sludge drying system and sludge drying equipment Download PDFInfo
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- CN113371971B CN113371971B CN202011328238.9A CN202011328238A CN113371971B CN 113371971 B CN113371971 B CN 113371971B CN 202011328238 A CN202011328238 A CN 202011328238A CN 113371971 B CN113371971 B CN 113371971B
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- sludge drying
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
Abstract
The application relates to a heat pump sludge drying system and sludge drying equipment. The heat pump sludge drying system comprises an oven, an external circulating air heat exchange module and a plurality of heat pump systems; each heat pump system comprises a screw compressor, a heat compensator, a liquid storage device, a shell-and-tube economizer and a heat exchanger; the accumulator is used for providing refrigerant; the exhaust port of the screw compressor, the heat compensator, the liquid reservoir, the tube side of the shell-and-tube economizer, the heat exchanger, the shell side of the shell-and-tube economizer and the air suction port of the screw compressor are sequentially connected to form a refrigerant circulation structure; the heat compensator is arranged inside the oven; the heat exchanger is arranged on the external circulating air heat exchange module. The number of movable parts of equipment can be effectively reduced, the energy efficiency of a heat pump system is effectively improved, the possibility of liquid impact of the screw compressor can be avoided, and the safety factor of the screw compressor is effectively improved.
Description
Technical Field
The application relates to the field of sludge drying, in particular to a heat pump sludge drying system and sludge drying equipment.
Background
Traditional heat pump sludge drying system to the scroll compressor is as the heat pump driving source, is restricted by the compressor characteristic, and its single compressor capacity can only accomplish 30HP to the maximum, needs a plurality of compressor modules to connect in parallel when being used for large-scale mummification project, increases system fault rate greatly. Meanwhile, the liquid impact resistance of the scroll compressor is low, and the compressor is damaged due to the liquid impact condition in the use process of the project. The traditional heat pump drying system is influenced by a refrigerant and a compressor, adopts low-temperature and low-humidity working conditions (less than 70 ℃ and less than 20 percent RH), is in a speed reduction area for a long time, and is low in drying efficiency. In addition, the traditional heat pump system only adjusts the oil return amount through a gas-liquid separator, the oil carrying amount of the system is not reduced at the exhaust source of the compressor, and the lubricating oil in the system influences the heat exchange performance of the system. And, receive the space influence, traditional heat pump system heat exchanger is copper aluminium material + anticorrosive coating, has the corrosion hidden danger. Meanwhile, a fan motor is always positioned in an air duct environment, and corrosion hidden danger exists.
Based on this, the above-mentioned technical problems exist, and no effective solution is given in the prior art.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the application provides a heat pump sludge drying system and a sludge drying device.
In a first aspect, the application provides a heat pump sludge drying system, which comprises an oven, an external circulation air heat exchange module and a plurality of heat pump systems; each heat pump system comprises a screw compressor, a heat compensator, a liquid storage device, a shell-and-tube economizer and a heat exchanger; the accumulator is used for providing refrigerant; the exhaust port of the screw compressor, the heat compensator, the liquid reservoir, the tube side of the shell-and-tube economizer, the heat exchanger, the shell side of the shell-and-tube economizer and the air suction port of the screw compressor are sequentially connected to form a refrigerant circulation structure; the heat compensator is arranged inside the oven; the heat exchanger is arranged on the external circulating air heat exchange module.
Optionally, the heat compensator comprises a first condenser and a first subcooler; the air outlet of the screw compressor, the first condenser, the first subcooler and the liquid accumulator are connected in sequence; the first subcooler is used for being arranged in a preheating module of the oven; the first condenser is used for being arranged on a drying module of the oven; the heat exchanger is an evaporator.
Optionally, an oil return port is arranged at the bottom of the shell side of the shell-and-tube economizer, and the oil return port returns the recovered lubricating oil into the screw compressor through an oil pump.
Optionally, a liquid refrigerant inlet and a liquid refrigerant outlet are arranged on the tube side of the shell-and-tube economizer; a gaseous refrigerant inlet and a gaseous refrigerant outlet are arranged on the shell side of the shell-and-tube economizer; the oil return port is close to the gaseous refrigerant outlet; the suction port of the screw compressor is connected with the gaseous refrigerant outlet, the first end of the evaporator is provided with a U-shaped bend, and the U-shaped bend is connected with the gaseous refrigerant inlet; a second end of the evaporator is connected to the liquid refrigerant outlet; the liquid refrigerant inlet is connected to the accumulator.
Optionally, each heat pump system further comprises a secondary oil separator; the exhaust port of the screw compressor is connected with the first condenser through the secondary oil separator; the secondary oil separator is also connected with the gaseous refrigerant outlet through a control valve.
Optionally, each heat pump system further comprises a water film dedusting system and a condensed water heat exchanger; the water film dedusting system is arranged on the external circulating air heat exchange module; the condensed water heat exchanger is used for being arranged on a preheating module of the oven; the evaporator is provided with a first water tank, and the condensed water heat exchanger is respectively connected with the first water tank and the water film dedusting system; the water film dust removal system is provided with a second water tank, and the second water tank and the water film dust removal system form a water circulation structure.
Optionally, one of the plurality of heat pump systems further includes a second condenser and a second subcooler; the air outlet of the screw compressor, the second condenser, the second subcooler and the liquid accumulator are connected in sequence; the second condenser and the second subcooler are arranged on the external circulation air heat exchange module, and the second subcooler is positioned between the second condenser and the evaporator.
Optionally, the first condenser and the first subcooler adopt aluminum fins, and the aluminum fins are provided with an anticorrosive coating; the evaporator, the second condenser and the second subcooler adopt stainless steel fins.
Optionally, the refrigerant is a medium temperature refrigerant.
In a second aspect, the application provides a sludge drying apparatus comprising a heat pump sludge drying system as described above.
Compared with the prior art, the technical scheme provided by the embodiment of the application has the following advantages:
the heat pump sludge drying system and the sludge drying equipment provided by the embodiment of the application can effectively reduce the number of movable parts, effectively improve the energy efficiency of the heat pump system, evaporate small liquid drops which are not completely evaporated by the evaporator, avoid causing the air suction liquid entrainment of the compressor, further avoid the liquid impact possibility of the screw compressor, and effectively improve the safety coefficient of the screw compressor.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic layout diagram of a sludge drying apparatus according to various embodiments of the present disclosure;
FIG. 2 is a schematic diagram of a heat pump system A provided in various embodiments of the present application;
FIG. 3 is a schematic diagram of a heat pump system B provided in various embodiments of the present application;
fig. 4 is a schematic view of a heat pump sludge drying system according to various embodiments of the present disclosure.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
Example one
The embodiment of the invention provides a heat pump sludge drying system, as shown in fig. 1-4, the heat pump sludge drying system is mainly divided into an oven module (oven for short) 100, an external circulation air heat exchange module 200, a compressor module 300 and a plurality of heat pump systems; each heat pump system comprises a screw compressor, a heat compensator, a liquid storage device, a shell-and-tube economizer and a heat exchanger; the accumulator is used for providing refrigerant; the exhaust port of the screw compressor, the heat compensator, the liquid reservoir, the tube side of the shell-and-tube economizer, the heat exchanger, the shell side of the shell-and-tube economizer and the air suction port of the screw compressor are sequentially connected to form a refrigerant circulation structure; the heat compensator is arranged inside the oven; the heat exchanger is arranged on the external circulating air heat exchange module. The screw compressors, secondary oil separators, oil coolers, shell-and-tube economizers, liquid reservoirs, connecting lines, valves, etc. of the plurality of heat pump systems constitute a compressor module 300. The compressor module 300 is completely isolated from the air duct, providing complete and stable reliability of the heat pump sludge drying system. The oven module is sequentially provided with a head module, a preheating module, an air inlet module, a middle module and a tail module, wherein the air inlet module and the middle module form a drying module. The air inlet module is provided with an external circulation air inlet, and the tail module is provided with an external circulation air outlet.
In the embodiment of the present invention, the oven module is provided with the upper mesh belt 114 and the lower mesh belt 115, the oven module, the heat exchange module, and the external circulation fan form an external circulation air channel, and the external circulation fan 400 is configured to generate external circulation air in the external circulation air channel. Before the heat pump system is started, the external circulating air can be heated through the electric heater 401, the working condition required by the operation of the heat pump system is quickly achieved, after the working condition is achieved, the heat pump system is started, the electric heater is closed, the heat exchange module exchanges heat with the external circulating air, the heat exchanged external circulating air enters the oven module, the sludge on the upper mesh belt is dried, and after the drying is completed, the sludge is conveyed out by the lower mesh belt. Optionally, a fresh air inlet 116 is arranged in the oven module, an air suction opening is arranged at the outlet of the evaporator of the external circulation heat exchange module, and an exhaust fan 117 is arranged at the air suction opening, so that the whole drying system can be kept in a negative pressure state, and the odor leakage risk is reduced.
The heat pump system of the embodiment of the invention adopts the screw compressor, so that the number of movable parts and equipment is effectively reduced, and compared with a conventional heat pump drying system, the heat pump system takes a 40 ton water/day project as an example, the number of the compressors is reduced by 93%, the number of movable parts of the equipment is greatly reduced, and the accumulated failure rate is reduced by more than 80%. The refrigerant circulation structure effectively improves the energy efficiency of a heat pump system, small liquid drops which are not completely evaporated by the evaporator are evaporated, the suction superheat degree of the compressor can be improved, the suction of the compressor is caused to carry liquid, the liquid impact possibility of the screw compressor is avoided, and the safety coefficient of the screw compressor is effectively improved.
Optionally, the heat pump sludge drying system has two heat pump systems: a heat pump system a and a heat pump system B. The heat pump system a (first heat pump system) includes a screw compressor 101, a secondary oil separator 102, an oil cooler 103, a shell-and-tube economizer 104, a reservoir 105, an expansion valve 106, an evaporator 107, a U-bend 108, a condenser 109, a subcooler 110, a condenser 111, and a subcooler 112. The heat pump system B (second heat pump system) includes a screw compressor 201, a secondary oil separator 202, an oil cooler 203, a shell-and-tube economizer 204, an accumulator 205, an expansion valve 206, an evaporator 207, a U-bend 208, a condenser 209, and a subcooler 210. Cycle flow of each heat pump system: screw compressor → secondary oil separator → condenser → subcooler → reservoir → shell and tube economizer → expansion valve → evaporator → shell and tube economizer → screw compressor.
In some embodiments, the afterheater comprises a first condenser (condenser 109/condenser 209) and a first subcooler (subcooler 110/subcooler 210); the discharge port of the screw compressor (screw compressor 101/screw compressor 201), the first condenser, the first subcooler and the accumulator (accumulator 105/accumulator 205) are connected in sequence; the first subcooler is used for being arranged on a preheating module of the oven; the first condenser is used for being arranged on a drying module of the oven; the heat exchanger is an evaporator (evaporator 107/evaporator 207).
In some embodiments, the shell-side bottom of the shell-and-tube economizer is provided with an oil return port that returns the recovered lubrication oil to the screw compressor via an oil pump. By the oil return function, lubricating oil which is accumulated for a long time and enters the system can return to the compressor through the shell-and-tube energy saver, so that the hidden danger of oil shortage of the screw compressor is avoided.
In some embodiments, the tube side of the shell and tube economizer is provided with a liquid refrigerant inlet and a liquid refrigerant outlet; a gaseous refrigerant inlet and a gaseous refrigerant outlet are arranged on the shell side of the shell-and-tube economizer; the oil return port is close to the gaseous refrigerant outlet; the suction port of the screw compressor is connected with the gaseous refrigerant outlet, the first end of the evaporator is provided with a U-shaped bend, and the U-shaped bend is connected with the gaseous refrigerant inlet; a second end of the evaporator is connected to the liquid refrigerant outlet; the liquid refrigerant inlet is connected to the accumulator. By arranging the U-shaped bend, lubricating oil accumulated into the heat pump system for a long time can be accumulated in the U-shaped bend, the oil level exceeds a certain height, and the lubricating oil is carried into the shell-and-tube economizer along with the refrigerant.
In some embodiments, each heat pump system further comprises a secondary oil separator; the exhaust port of the screw compressor is connected with the first condenser through the secondary oil separator; the secondary oil separator is also connected with the gaseous refrigerant outlet through a control valve. Through setting up the secondary oil separator, avoid too much lubricating oil to get into heat pump system, influence heat transfer performance, the oil of secondary oil separator separation regularly returns compressor system, guarantees that the system does not have the risk of losing oil.
In some embodiments, each heat pump system further comprises a water film dedusting system 211 and a condensate water heat exchanger 113; the water film dedusting system is arranged on the external circulating air heat exchange module; the condensed water heat exchanger is used for being arranged on a preheating module of the oven; the evaporator is provided with a first water tank 212, and the condensed water heat exchanger is respectively connected with the first water tank and the water film dedusting system; the water film dust removal system is provided with a second water tank 213, which forms a water circulation structure with the water film dust removal system. The condensate heat exchanger 113 may further include a condenser discharge port 214. The condenser drain may drain excess condensate.
In some embodiments, one of the plurality of heat pump systems (heat pump system a/first heat pump system) further comprises a second condenser 111 and a second subcooler 112; the air outlet of the screw compressor, the second condenser, the second subcooler and the liquid reservoir are connected in sequence; the second condenser and the second subcooler are arranged between the second condenser and the evaporator. The second subcooler can realize dry-wet separation, thereby avoiding the corrosion hidden danger of the second condenser.
Optionally, the first condenser and the first subcooler adopt aluminum fins, and the aluminum fins are provided with anticorrosive coatings; the evaporator, the second condenser and the second subcooler adopt stainless steel fins. The heat exchanger adopts a stainless steel heat exchange tube, the heat exchanger in the oven adopts aluminum fins and an anticorrosive coating, and the external circulation heat exchanger adopts stainless steel fins, so that the potential corrosion hazard is completely avoided; the screw compressor is adopted, a certain wet stroke is allowed, and the liquid impact resistance is strong.
In some embodiments, the refrigerant is an intermediate temperature refrigerant. The medium-temperature refrigerant is selected, the energy efficiency is 40% -50% higher than that of a conventional refrigerant heat pump, the applied condensing temperature and the applied evaporating temperature are both higher than the working condition of a conventional heat pump system, and higher air supply temperature and evaporator outlet air temperature can be realized, so that the medium-temperature high-humidity working condition is achieved, and the system efficiency is improved. Further, the medium-temperature high-humidity working condition is adopted, wet drying is achieved, compared with a traditional heat pump sludge drying system, the constant-speed drying stage of a sludge drying characteristic curve is long in duration, the surface of sludge keeps a wet state for a long time, the surface is not prone to incrustation and crusting, meanwhile, a capillary channel is expanded, diffusion of moisture in the sludge can be facilitated, the sludge drying time is shortened, and the drying rate is further improved.
The oven module in the embodiment of the invention comprises a drying chamber and a heat supplementing chamber, and provides a sludge drying heat supplementing heat source and a drying environment. The external circulation air heat exchange module comprises a water film dedusting system, an evaporator of the heat pump system, a second subcooler and a second condenser. The three modules are arranged in different areas, the oven module is arranged in a two-layer space, and the compressor module and the external circulation air heat exchange module are arranged in a one-layer space below the bottom of the oven module, so that the occupied area is saved. The compressor module is completely independent of the air duct, so that the maintenance and the overhaul are convenient, and the corrosion is avoided. The oven module and the external circulation heat exchanger module realize dry-wet separation of two areas through the second subcooler 112, and the wet area heat exchanger (the evaporator 107/207) is made of a full stainless steel material, so that the corrosion hidden trouble of the heat exchanger is avoided.
The heat pump system in the embodiment of the invention mainly comprises a screw compressor, a secondary oil separator, a condenser (a first condenser/a second condenser), a subcooler (a first subcooler/a second subcooler), a liquid storage device, a shell-and-tube energy saver, an expansion valve, an evaporator, a matched valve, a sensor and a pipeline, and the circulation process comprises the following steps: screw compressor → secondary oil separator → condenser → subcooler → accumulator → shell and tube economizer → expansion valve → evaporator → shell and tube economizer → screw compressor. The secondary oil separator is arranged to prevent excessive lubricating oil from entering the heat pump system to influence the heat exchange performance, and the oil separated by the secondary oil separator returns to the compressor system at regular intervals; the evaporator outlet pipeline is provided with a U-shaped bend, lubricating oil which enters the heat pump system in a long-time accumulated mode is stored in the U-shaped bend, the oil level exceeds a certain height, the lubricating oil is brought into the shell and tube type energy saver along with the refrigerant, the shell and tube type energy saver has the oil return function of the system, the lubricating oil is pumped into the compressor suction pipeline through the oil pump at regular intervals, and the system is guaranteed to be free of oil loss risk. Meanwhile, the shell-and-tube economizer can improve the supercooling degree of a heat pump system and improve the energy efficiency of the heat pump on the one hand, and on the other hand, the gaseous refrigerant obtains further superheat degree and is controlled within a certain superheat degree range, so that the energy efficiency of the heat pump system can be improved, small liquid drops which are not completely evaporated by the evaporator can be evaporated, and the phenomenon that the screw compressor sucks air and carries liquid is avoided. The heat exchange capacity of all condensers and subcoolers of the heat pump system is completely sent into the drying oven to be used for evaporating moisture in the sludge, so that the gradient utilization of energy is realized, the energy consumption is further reduced, and the energy utilization rate is maximized.
Example two
The embodiment of the invention provides sludge drying equipment which comprises a heat pump sludge drying system according to any one of the embodiments.
The specific implementation of the embodiment of the invention can be seen in the first embodiment, and has corresponding technical effects.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
While the present invention has been described with reference to the particular illustrative embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalent arrangements, and equivalents thereof, which may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A heat pump sludge drying system is characterized by comprising an oven, an external circulation air heat exchange module and a plurality of heat pump systems; each heat pump system comprises a screw compressor, a heat compensator, a liquid storage device, a shell-and-tube economizer and a heat exchanger; the accumulator is used for providing refrigerant; the exhaust port of the screw compressor, the heat compensator, the liquid reservoir, the tube side of the shell-and-tube economizer, the heat exchanger, the shell side of the shell-and-tube economizer and the air suction port of the screw compressor are sequentially connected to form a refrigerant circulation structure; the heat compensator is arranged inside the oven; the heat exchanger is arranged on the external circulating air heat exchange module;
the drying oven module is sequentially provided with a head module, a preheating module, an air inlet module, a middle module and a tail module, wherein the air inlet module and the middle module form a drying module; the air inlet module is provided with an external circulating air inlet, and the tail module is provided with an external circulating air outlet;
the heat compensator comprises a first condenser and a first subcooler; the air outlet of the screw compressor, the first condenser, the first subcooler and the liquid accumulator are connected in sequence; the first subcooler is used for being arranged in a preheating module of the oven; the first condenser is used for being arranged on a drying module of the oven; the heat exchanger is an evaporator;
each heat pump system also comprises a water film dedusting system and a condensed water heat exchanger; the water film dedusting system is arranged on the external circulating air heat exchange module; the condensed water heat exchanger is used for being arranged on a preheating module of the drying oven; the evaporator is provided with a first water tank, and the condensed water heat exchanger is respectively connected with the first water tank and the water film dust removal system; the water film dust removal system is provided with a second water tank, and the second water tank and the water film dust removal system form a water circulation structure.
2. The heat pump sludge drying system of claim 1 wherein an oil return port is provided at the bottom of the shell side of the shell-and-tube economizer, and the oil return port returns the recovered lubricating oil to the screw compressor via an oil pump.
3. The heat pump sludge drying system of claim 2 wherein the tube side of the shell and tube economizer is provided with a liquid refrigerant inlet and a liquid refrigerant outlet; a gaseous refrigerant inlet and a gaseous refrigerant outlet are arranged on the shell side of the shell-and-tube economizer; the oil return port is close to the gaseous refrigerant outlet; the suction port of the screw compressor is connected with the gaseous refrigerant outlet, the first end of the evaporator is provided with a U-shaped bend, and the U-shaped bend is connected with the gaseous refrigerant inlet; a second end of the evaporator is connected to the liquid refrigerant outlet; the liquid refrigerant inlet is connected to the accumulator.
4. The heat pump sludge drying system of claim 3 wherein each heat pump system further comprises a secondary oil separator; the exhaust port of the screw compressor is connected with the first condenser through the secondary oil separator; the secondary oil separator is also connected with the gaseous refrigerant outlet through a control valve.
5. The heat pump sludge drying system of claim 1 wherein one of the plurality of heat pump systems further comprises a second condenser and a second subcooler; the air outlet of the screw compressor, the second condenser, the second subcooler and the liquid accumulator are connected in sequence; the second condenser and the second subcooler are arranged between the second condenser and the evaporator.
6. The heat pump sludge drying system of claim 5, wherein the first condenser and the first subcooler are aluminum fins provided with an anti-corrosion coating; the evaporator, the second condenser and the second subcooler adopt stainless steel fins.
7. The heat pump sludge drying system of any one of claims 1-6, wherein the refrigerant is a medium temperature refrigerant.
8. A sludge drying apparatus, characterized in that the sludge drying apparatus comprises a heat pump sludge drying system according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011328238.9A CN113371971B (en) | 2020-11-24 | 2020-11-24 | Heat pump sludge drying system and sludge drying equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011328238.9A CN113371971B (en) | 2020-11-24 | 2020-11-24 | Heat pump sludge drying system and sludge drying equipment |
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| CN113371971A CN113371971A (en) | 2021-09-10 |
| CN113371971B true CN113371971B (en) | 2022-10-28 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210012737U (en) * | 2019-02-14 | 2020-02-04 | 北京联合创业环保工程股份有限公司 | Full-energy sludge drying heat pump unit |
| CN111018299A (en) * | 2019-11-18 | 2020-04-17 | 江苏天舒电器有限公司 | Negative pressure type heat pump closed sludge drying system |
| KR102111587B1 (en) * | 2019-11-07 | 2020-05-15 | (주)제이피텍 | a drying machine of sludge |
| CN111333301A (en) * | 2020-04-08 | 2020-06-26 | 湖南清源智造设备有限公司 | Sludge drying system with combination of gas internal combustion engine and heat pump |
-
2020
- 2020-11-24 CN CN202011328238.9A patent/CN113371971B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210012737U (en) * | 2019-02-14 | 2020-02-04 | 北京联合创业环保工程股份有限公司 | Full-energy sludge drying heat pump unit |
| KR102111587B1 (en) * | 2019-11-07 | 2020-05-15 | (주)제이피텍 | a drying machine of sludge |
| CN111018299A (en) * | 2019-11-18 | 2020-04-17 | 江苏天舒电器有限公司 | Negative pressure type heat pump closed sludge drying system |
| CN111333301A (en) * | 2020-04-08 | 2020-06-26 | 湖南清源智造设备有限公司 | Sludge drying system with combination of gas internal combustion engine and heat pump |
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