CN110590113A - Water-cooling type closed sludge drying system and temperature control method thereof - Google Patents
Water-cooling type closed sludge drying system and temperature control method thereof Download PDFInfo
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- CN110590113A CN110590113A CN201910817359.0A CN201910817359A CN110590113A CN 110590113 A CN110590113 A CN 110590113A CN 201910817359 A CN201910817359 A CN 201910817359A CN 110590113 A CN110590113 A CN 110590113A
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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
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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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- 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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/027—Condenser control arrangements
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Thermal Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Drying Of Solid Materials (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a water-cooling type closed sludge drying system and a temperature control method thereof. The temperature control method controls the water flow through the frequency conversion adjustment of the water pump, thereby controlling the heat exchange quantity of the water cooler, supplementing the cold quantity lacking at the evaporation side, balancing the load balance of the circulating air at the evaporation side and the condensation side, and keeping the drying temperature stable. The temperature control method of the system is simple in control mode, high in control precision and high in control reliability.
Description
Technical Field
The invention relates to the technical field of sludge drying, in particular to a water-cooling type closed sludge drying system and a temperature control method thereof.
Background
The dehumidification energy efficiency ratio smer (specific moisture evaluation rate) is an important index for measuring the dehumidification performance of the drying device. Conventional dryers, such as superheated steam dryers, have theoretical SMER values of 1.595kg/(kw · h) (100 ℃), and practical apparatus SMER values of only 20% to 80% of theory.
With the drive of policy interest and high growth factor, the standardization of sewage and sludge treatment has created a demand for the drying equipment market. In the sludge drying process, the drying temperature directly influences the drying effect of sludge, and in addition, the drying temperature has a vital influence on important parameters of a unit, such as the dewatering rate, the dehumidification energy efficiency ratio SMER and the like. The existing drying temperature control method of the drying machine has the problems of complex control, poor control precision, low reliability and the like.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a water-cooling type closed sludge drying system and a temperature control method thereof, which have the advantages of simple control mode, high control precision and high control reliability.
The technical scheme adopted by the invention is as follows:
the utility model provides a water-cooling type closed sludge drying system, includes stoving case, main blower, main condenser, evaporimeter and water chiller, evaporimeter, main condenser, main blower and stoving case pass through the airtight endless stoving return circuit of air guide tube coupling formation, water-cooling type closed sludge drying system still includes compressor, water pump and cooling tower, compressor, main condenser and evaporimeter pass through refrigerant tube coupling and form airtight endless refrigerant return circuit, the water chiller is connected the water pump with cooling tower forms the return circuit that adjusts the temperature, main condenser with be equipped with thermodetector between the main blower.
Furthermore, the circulating airflow in the drying loop is air, the circulating medium in the refrigerant loop is refrigerant, and the medium in the temperature adjusting loop is cooling water.
Furthermore, a condensing pressure controller is arranged on a refrigerant pipeline of the refrigerant inlet of the main condenser.
Further, a thermostatic expansion valve is arranged between the evaporator and the main condenser.
Furthermore, the water pump is a variable frequency pump capable of adopting variable frequency control.
The temperature control method of the water-cooling type closed sludge drying system comprises the following steps: the temperature of the drying gas entering the drying box from the main condenser is controlled at a target value by utilizing a water pump to pump cooling water from a cooling water tower to a water cooler for heat exchange so as to take out part of heat of circulating air in a drying loop;
wherein the output power of the water pump is set to be adjustable within 15% -120% of the rated power of the water pump, and the initial output power of the water pump is set to be 80% of the rated power;
when the temperature of the drying gas is larger than the target value, the output power of the water pump is increased by 5% of the rated power of the water pump on the basis of the current output power of the water pump, and the water pump is detected and adjusted once every 30 seconds;
when the temperature of the drying gas is less than the target value, the output power of the water pump is reduced by 5% of the rated power of the water pump on the basis of the current output power of the water pump, and the water pump is detected and adjusted once every 30 seconds;
and when the temperature of the drying gas is equal to the target value, the output power of the water pump keeps the current output power unchanged, and the detection and the adjustment are performed once every 30 seconds.
Further, controlling the temperature of the drying gas entering the drying oven from the main condenser at a target value includes controlling a deviation a of the temperature of the drying gas from the target value to be less than or equal to 2 ℃.
Further, the method also comprises the step of adjusting the pressure in the refrigerant loop to control the temperature of the drying gas in the drying box:
when the pressure of the refrigerant loop reaches the disconnection value, the output power of the cooling fan is increased by 5% of the rated power on the basis of the current output power, and the detection and the adjustment are performed once every 30 seconds; when the pressure of the refrigerant loop reaches a recovery value, the output power of the cooling fan keeps the current output power unchanged, and the detection and the adjustment are performed once every 30 seconds.
Further, when the heat exchange temperature difference of the refrigerant circuit is b, the cutoff value of the pressure of the refrigerant circuit is set to the target value + a + b, and the recovery value of the pressure of the refrigerant circuit is set to the target value + b.
The invention has the beneficial effects that:
according to the water-cooling type closed sludge drying system and the temperature control method thereof, the water flow is controlled through the variable frequency regulation of the water pump, so that the heat exchange quantity of the water cooler is controlled, the cold quantity lacking at the evaporation side is supplemented, the load balance of the circulating air at the evaporation side and the condensation side is balanced, and the drying temperature is kept stable. Therefore, the temperature control method of the system has the advantages of simple control mode, high control precision and high control reliability.
Drawings
FIG. 1: the invention discloses a schematic diagram of a drying loop of a water-cooling type closed sludge drying system;
FIG. 2: the invention discloses a schematic diagram of a refrigerant loop of a water-cooling type closed sludge drying system;
FIG. 3: the embodiment of the invention provides a schematic diagram of a temperature regulating loop of a water-cooling type closed sludge drying system.
Names and designations of parts
1. An evaporator; 2. a main condenser; 3. a temperature detector; 4. a main fan; 5. a drying box; 6. a water cooler; 7. a compressor; 8. a condensing pressure controller; 9. a thermostatic expansion valve; 10. a cooling water tower; 11. and (4) a water pump.
Detailed description of the preferred embodiments
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Examples
Referring to fig. 1-3, an embodiment of the invention discloses a water-cooling type closed sludge drying system, which comprises a drying box 5, a main fan 4, a main condenser 2, an evaporator 1 and a water cooler 6, wherein the water cooler 6, the evaporator 1, the main condenser 2, the main fan 4 and the drying box 5 are connected through an air guide pipeline to form a closed circulating drying loop, the water-cooling type closed sludge drying system further comprises a compressor 7, the main condenser 2 and the evaporator 1 are connected through a refrigerant pipeline to form a closed circulating refrigerant loop, and the water cooler 6 is connected with a water pump 11 and a cooling water tower 10 to form a temperature regulating loop. The main condenser 2 with be equipped with thermodetector 3 between the main fan 4, thermodetector 3 is arranged in real time detection main condenser 2 and comes out the temperature of treating the air that gets into in the stoving case 5.
The circulating air flow in the drying loop is air. In the drying loop, after the circulating air flow in the circulating loop is heated in the main condenser 2 to raise the temperature, the circulating air flow is sucked and pushed by the main fan 4 to enter the drying box 5 to perform hot air drying on the sludge in the drying box 5, wherein the sludge in the drying box 5 is supported by a mesh belt arranged in the drying box 5, and the high-temperature air heat flow exchanges heat with the sludge when passing through the mesh belt to bring out the moisture in the sludge, so that the purpose of drying the sludge is achieved; the circulating air flow from the drying box 5 is mixed with moisture emitted from the sludge, the air flows into the water cooler 6 from the backflow air guide pipeline, is pre-cooled by the water cooler 6 and then flows into the evaporator 1, and the moisture is condensed in the evaporator 1, so that the moisture in the air is drained; the air from which the moisture has been drained is again introduced into the main condenser 2 and heated, and is then again sent to the drying box 5 for use in drying the sludge. The sludge is recycled until the sludge in the drying box 5 is completely dried. The main fan 4 is used as the only power device for pushing air to flow circularly in the drying loop, and all devices in the loop are connected and communicated through air guide pipelines, so that air flow in the loop can move directionally.
And the circulating medium in the refrigerant loop is a refrigerant. In the refrigerant circuit, the refrigerant flows from the compressor 7, into the main condenser 2, and finally back to the compressor 7, and undergoes a cycle, and the cycle is repeated to form a continuous-cycle refrigerant circuit. In one embodiment, the coolant is Freon.
Further, a thermostatic expansion valve 9 is arranged between the evaporator 1 and the main condenser 2. The thermostatic expansion valve 9 realizes throttling from condensation pressure to evaporation pressure, controls the flow of the refrigerant (refrigerant) at the same time, supplies liquid to the evaporator 1 in an optimal mode, and ensures that the superheat degree of the refrigerant (refrigerant) steam at the outlet of the evaporator 1 is stable.
Furthermore, a condensing pressure controller 8 is arranged on a refrigerant pipeline of a refrigerant inlet of the main condenser 2. The condensation pressure controller 8 detects and feeds back a refrigerant supply pressure value in the refrigerant loop in real time, and the larger the pressure value displayed by the condensation pressure controller 8 is, the larger the refrigerant supply pressure value in the refrigerant loop is, namely, the higher the refrigerant gas refrigerant supply efficiency is.
The medium in the temperature regulating loop is cooling water. In the temperature adjusting loop, cooling water is pumped from a cooling water tower 10 by a water pump 11 to enter a water cooler 6, heat transfer is carried out between the cooling water and air in a drying loop, so that part of heat in the air in the drying loop is taken away and retained in the cooling water tower 10, and the cooling water tower 10 is cooled and dispersed into the external environment, so that the redundant heat on the condensation side is discharged into the atmosphere, and the effect of balancing loads on the evaporation side and the condensation side is achieved. It can be understood that, when the output power of the water pump 11 is increased, the heat discharged is increased, and the drying temperature is decreased; on the contrary, when the output power of the water pump 11 is decreased, the heat discharged is decreased, and the drying temperature is increased.
Further, the water pump 11 is an inverter pump that can be controlled by an inverter. The output power of the water pump 11 can be adjusted by adopting the variable frequency pump, so that the aim of adjusting the drying temperature of the system is fulfilled.
The embodiment of the invention also discloses a temperature control method of the air-cooled closed sludge drying system, which comprises the following steps: controlling the temperature of the drying gas entering the drying box 5 from the main condenser 2 to a target value by heat exchange with cooling water pumped from the cooling water tower 10 to the water cooler 6 by using the water pump 11 to carry out a part of heat of circulating air in the drying loop;
wherein the output power of the water pump 11 is set to be adjustable within 15% -120% of the rated power of the water pump, and the initial output power of the water pump 11 is set to be 80% of the rated power;
when the temperature of the drying gas is larger than the target value, the output power of the water pump 11 is increased by 5% of the rated power of the drying gas on the basis of the current output power of the drying gas, and the drying gas is detected and adjusted once every 30 seconds;
when the temperature of the drying gas is less than the target value, the output power of the water pump 11 is reduced by 5% of the rated power of the water pump on the basis of the current output power of the water pump, and the detection and the adjustment are carried out once every 30 seconds;
when the temperature of the drying gas is equal to the target value, the output power of the water pump 11 is kept unchanged, and the detection and the adjustment are performed every 30 seconds.
Further, controlling the temperature of the drying gas entering the drying oven from the main condenser at a target value includes controlling a deviation a of the temperature of the drying gas from the target value to be less than or equal to 2 ℃.
Further, the method also comprises the step of adjusting the pressure of refrigerant gas in the condensation loop to control the temperature of drying gas in the drying box 5:
when the pressure of the refrigerant loop reaches the disconnection value, the output power of the cooling fan is increased by 5% of the rated power on the basis of the current output power, and the detection and the adjustment are performed once every 30 seconds; when the pressure of the refrigerant loop reaches a recovery value, the output power of the cooling fan keeps the current output power unchanged, and the detection and the adjustment are performed once every 30 seconds.
Further, when the heat exchange temperature difference of the refrigerant circuit is b, the cutoff value of the pressure of the refrigerant circuit is set to the target value + a + b, and the recovery value of the pressure of the refrigerant circuit is set to the target value + b.
In a specific embodiment, when the temperature target value of the drying gas is T1, and the drying gas temperature control deviation a is set to 2 ℃, the allowable drying gas temperature control range of the system is [ T1-2, T1+2], i.e. when the current value of the temperature of the drying gas falls within the control range [ T1-2, T1+2], the system considers that the temperature of the drying gas is equal to the target value. Otherwise, the system considers that the temperature of the drying gas is not equal to the target value, and the output power of the water pump 11 needs to be adjusted.
For example, when the heat exchange temperature difference b of the refrigerant circuit is 5 ℃, the condensing temperature Tc of the system is T1+5 ℃, in this case, a cut-off value Pk1 may be set for the pressure of the refrigerant circuit, and a recovery value Pk2 may be set for the pressure of the refrigerant circuit, wherein the cut-off value Pk1 is a saturation pressure corresponding to a target value T1+7 (i.e., T1+2+5) of the drying temperature, and the recovery value Pk2 is a saturation pressure corresponding to a target value T1+5 of the drying temperature. For example, if the target drying temperature is 50 ℃, the cut-off value is 1.47MP (gauge pressure, corresponding to 50+7 ℃); the recovery value was 1.39MP (gauge pressure, corresponding to 50+5 ℃ C.).
In summary, the air-cooled closed sludge drying system of the present invention adopts frequency conversion adjustment, and through output adjustment of the water pump 11, the water pump 11 firstly performs a pre-cooling function before air in the drying loop enters the evaporator 1, and at this time, surplus heat can be discharged to the atmosphere, and secondly, the load balance of the circulating air on the evaporation side and the condensation side can be balanced, so that the drying temperature is kept stable.
The temperature control method of the system can be adjusted by adjusting the output power of the water pump 11. When the output power of the water dispersion pump 11 is adjusted, the system can be simultaneously controlled according to the pressure of the refrigerant in the refrigerant loop and the temperature of the drying gas measured by the temperature detector 3 arranged between the main condenser 2 and the main fan 4, the system has higher reliability, and the problem of control failure caused by inaccurate temperature detection is avoided; meanwhile, the operation pressure of the system can be stabilized, and the reliability of the system is ensured.
In addition, through setting up the frequency (30S detects once) and the range (+ 5% or-5%) of reasonable regulation of water pump 11, avoided system temperature to appear shaking undulant for drying temperature is more stable, and accurate control more easily.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. The utility model provides a water-cooling type closed sludge drying system, its characterized in that, includes stoving case, main blower, main condenser, evaporimeter and water chiller, evaporimeter, main condenser, main blower and stoving case pass through the airtight endless stoving return circuit of air guide tube coupling formation, water-cooling type closed sludge drying system still includes compressor, water pump and cooling tower, compressor, main condenser and evaporimeter pass through refrigerant tube coupling formation airtight endless coolant return circuit, the water chiller is connected the water pump with cooling tower forms the return circuit that adjusts the temperature, main condenser with be equipped with thermodetector between the main blower.
2. The water-cooling type closed sludge drying system as claimed in claim 1, wherein the circulating air flow in the drying loop is air, the circulating medium in the cooling medium loop is cooling medium, and the medium in the temperature adjusting loop is cooling water.
3. The water-cooling type closed sludge drying system as claimed in claim 2, wherein a condensing pressure controller is provided on a refrigerant pipeline of the refrigerant inlet of the main condenser.
4. The water-cooling type closed sludge drying system as claimed in claim 3, wherein a thermal expansion valve is provided between the evaporator and the main condenser.
5. The water-cooling type closed sludge drying system according to claim 1, wherein the water pump is a variable frequency pump capable of being controlled by variable frequency.
6. A method for controlling the temperature of the water-cooling type closed sludge drying system as claimed in any one of claims 1 to 5, comprising: the temperature of the drying gas entering the drying box from the main condenser is controlled at a target value by utilizing a water pump to pump cooling water from a cooling water tower to a water cooler for heat exchange so as to take out part of heat of circulating air in a drying loop;
wherein the output power of the water pump is set to be adjustable within 15% -120% of the rated power of the water pump, and the initial output power of the water pump is set to be 80% of the rated power;
when the temperature of the drying gas is larger than the target value, the output power of the water pump is increased by 5% of the rated power of the water pump on the basis of the current output power of the water pump, and the water pump is detected and adjusted once every 30 seconds;
when the temperature of the drying gas is less than the target value, the output power of the water pump is reduced by 5% of the rated power of the water pump on the basis of the current output power of the water pump, and the water pump is detected and adjusted once every 30 seconds;
and when the temperature of the drying gas is equal to the target value, the output power of the water pump keeps the current output power unchanged, and the detection and the adjustment are performed once every 30 seconds.
7. The temperature control method of the water-cooling type closed sludge drying system according to claim 6, wherein the controlling the temperature of the drying gas entering the drying box from the main condenser to a target value comprises controlling a deviation a of the drying gas temperature from the target value to be less than or equal to 2 ℃.
8. The temperature control method of the water-cooling type closed sludge drying system according to claim 7, further comprising adjusting the pressure in the refrigerant circuit to control the temperature of the drying gas in the drying box:
when the pressure of the refrigerant loop reaches the disconnection value, the output power of the cooling fan is increased by 5% of the rated power on the basis of the current output power, and the detection and the adjustment are performed once every 30 seconds; when the pressure of the refrigerant loop reaches a recovery value, the output power of the cooling fan keeps the current output power unchanged, and the detection and the adjustment are performed once every 30 seconds.
9. The temperature control method of the water-cooling type closed sludge drying system according to claim 8, wherein when the heat exchange temperature difference of the refrigerant circuit is b, the cutoff value of the pressure of the refrigerant circuit is set to the target value + a + b, and the recovery value of the pressure of the refrigerant circuit is set to the target value + b.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910817359.0A CN110590113A (en) | 2019-08-30 | 2019-08-30 | Water-cooling type closed sludge drying system and temperature control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910817359.0A CN110590113A (en) | 2019-08-30 | 2019-08-30 | Water-cooling type closed sludge drying system and temperature control method thereof |
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| CN110590113A true CN110590113A (en) | 2019-12-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910817359.0A Pending CN110590113A (en) | 2019-08-30 | 2019-08-30 | Water-cooling type closed sludge drying system and temperature control method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605910A (en) * | 2016-02-18 | 2016-05-25 | 郏松筠 | Operation modes and structure of heat-circulation heat pump drying unit |
| CN109553270A (en) * | 2018-12-06 | 2019-04-02 | 江苏天舒电器有限公司 | A kind of pump type heat enclosed sludge drying system and its control method |
-
2019
- 2019-08-30 CN CN201910817359.0A patent/CN110590113A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105605910A (en) * | 2016-02-18 | 2016-05-25 | 郏松筠 | Operation modes and structure of heat-circulation heat pump drying unit |
| CN109553270A (en) * | 2018-12-06 | 2019-04-02 | 江苏天舒电器有限公司 | A kind of pump type heat enclosed sludge drying system and its control method |
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