CN212157493U - Energy-saving constant-temperature humidity-control air conditioning system capable of utilizing cooling tower to supply cold in winter - Google Patents
Energy-saving constant-temperature humidity-control air conditioning system capable of utilizing cooling tower to supply cold in winter Download PDFInfo
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- CN212157493U CN212157493U CN202020671382.1U CN202020671382U CN212157493U CN 212157493 U CN212157493 U CN 212157493U CN 202020671382 U CN202020671382 U CN 202020671382U CN 212157493 U CN212157493 U CN 212157493U
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Abstract
The utility model relates to a wet air conditioning system of constant temperature accuse. The energy-saving constant-temperature humidity control unit comprises an air return section, a rotating wheel dehumidification section, a rear heat replacement section and a fan section which are sequentially communicated from front to back, wherein a regeneration area inlet of the rotating wheel dehumidification section is provided with a regeneration heater, a regeneration area outlet of the rotating wheel dehumidification section is provided with a regeneration fan, the air return section is communicated with a return air inlet of a casting workshop through a return air pipe, and the fan section is communicated with an air supply outlet of the casting workshop through an air supply pipe. The utility model solves the requirements of the drying process for the precision casting shell-making on the constant temperature and low humidity environment, realizes the independent control of the temperature and the humidity, reduces the drying time of the workpiece, improves the production efficiency and reduces the energy consumption; meanwhile, the problem that the chilled water cannot be normally supplied due to the fact that the water chilling unit cannot normally operate in a low-temperature environment is solved.
Description
Technical Field
The utility model relates to a wet air conditioning system of constant temperature accuse, more specifically say, relate to a be applied to the wet air conditioning system of energy-conserving constant temperature accuse of usable cooling tower winter cooling of precision casting trade.
Background
The cooling tower is a common cooling device in a central air-conditioning system and a process cooling system, and the cooling principle of the cooling tower is as follows: the water absorbs heat in the evaporation process so that the temperature of water which is not evaporated is reduced, the degree of water temperature reduction depends on the evaporation amount, the evaporation water amount depends on the saturation degree of air, firstly, cooling water is in contact with the air in a cooling tower to carry out heat and humidity exchange, the cooling effect can be realized as long as the temperature of a wet bulb is lower than that of the cooling water, the outdoor air temperature is gradually reduced along with the coming of transition seasons and winter, the relative humidity is reduced, the temperature of the outdoor wet bulb is also reduced along with the coming of the transition seasons and the temperature of the water discharged from the cooling tower is also reduced along.
In the precision casting production process, the surface layer, the back layer and the slurry cleaning and drying process section all require constant temperature and humidity environment, and the temperature and humidity environment of each process section must be strictly controlled in order to ensure the product quality of workpieces. The energy-saving constant-temperature humidity control unit needs a refrigerating unit to provide chilled water all the year round, a cooling tower is needed to dissipate heat of a unit condenser when the screw type refrigerating unit operates in a refrigerating mode, the screw type refrigerating unit returns oil by means of pressure difference, requirements are generally provided for the lower limit value of the water supply temperature of the cooling water for ensuring normal oil return of the refrigerating unit, the minimum water supply temperature of the cooling water is not lower than 16 degrees according to sample data of a screw type water chilling unit manufacturer, the unit can be protected to stop once the water supply temperature is lower than the lower limit value, even if a cooling tower fan is controlled not to operate in a low-temperature environment, the water supply temperature of the cooling water still reaches the lower limit value of the temperature, the.
The existing dehumidification system mostly adopts a single surface cooling dehumidification system to carry out dehumidification, and because the heat and humidity combined treatment causes energy waste, and the problems of low temperature and humidity control precision, small dehumidification amount in a low-temperature environment and the like exist, the environment with the relative humidity requirement lower than 40% cannot be realized.
The temperature control dehumidification unit can discharge high-temperature and high-humidity air in the process treatment process, and the regenerated fresh air needs to be continuously heated, so that energy sources such as electric energy and steam are consumed, and waste heat resources need to be recycled through technical measures urgently.
Disclosure of Invention
The utility model aims at overcoming the deficiencies of the prior art, providing an energy-conserving constant temperature accuse wet air conditioning system and accuse temperature dehumidification method of usable cooling tower cooling in winter, it is first: the problem that the chilled water cannot be normally supplied due to the fact that the water chilling unit cannot normally operate in a low-temperature environment is solved, the failure rate of equipment is reduced, and the operation working condition of the equipment is improved; secondly, the method comprises the following steps: the cooling tower utilizes a natural cold source for cooling, so that the cooling requirement of process production is met, the running time of a refrigerating unit is reduced, a remarkable energy-saving effect is obtained, and the energy consumption is reduced; thirdly, the method comprises the following steps: the cooling water storage tank can be used for cold accumulation under the condition of low production load, and a natural cold source is utilized to the maximum extent; fourthly: the temperature and humidity independent control air conditioning equipment and the control method for the low-humidity production environment are provided; fifth, the method comprises the following steps: the waste heat of the high-temperature high-humidity waste gas is recycled for preheating the regenerated fresh air, so that the air inlet temperature is improved, the energy consumption is reduced, and the operation cost is saved.
The utility model relates to an energy-saving constant temperature humidity control air conditioning system capable of utilizing cooling tower to supply cold in winter, which is characterized by comprising an energy-saving constant temperature humidity control unit for cooling and dehumidifying a casting shop 28, the energy-saving constant temperature humidity control unit comprises a return air section 1, a rotary wheel dehumidification section 4, a rear replacement heat section 5 and a fan section 6 which are sequentially communicated from front to back, a regeneration area inlet 32 of the rotary wheel dehumidification section 4 is provided with a regeneration heater 9, a regeneration area outlet 33 of the rotary wheel dehumidification section 4 is provided with a regeneration fan 10, the return air section 1 is communicated with a return air inlet of the casting shop through a return air pipe 27, the fan section 6 is communicated with an air supply outlet of the casting shop through an air supply pipe 29, a water outlet of the rear replacement heat section 5 is communicated with an evaporator inlet of the refrigerating unit 14 through a first circulation pipeline 23, a water inlet of the rear replacement heat section 5 is communicated with an evaporator water outlet of the refrigerating unit 14 through a, an electric regulating valve 11 is installed on a first circulating pipeline 23, a condenser water outlet of a refrigerating unit 14 is communicated with a cooling tower 18 water inlet through a third circulating pipeline 25, a condenser water inlet of the refrigerating unit 14 is communicated with a cooling tower 18 water outlet through a fourth circulating pipeline 26, a temperature and humidity sensor 12 is installed on a return air pipe 27, a chilled water circulating pump 13 is installed on the first circulating pipeline 23, a cooling water pump 16 is installed on the fourth circulating pipeline 26, and a regeneration heater 9, a regeneration fan 10, the electric regulating valve 11, the temperature and humidity sensor 12, the chilled water circulating pump 13 and the cooling water pump 16 are all controlled by a PLC (programmable logic controller);
the air return section 1 is provided with an air inlet 20 and a fresh air inlet 21, the air inlet 20 is communicated with an air return pipe 27, and the fresh air inlet 21 is communicated with external fresh air;
a filtering section 2 and a front replacement hot section 3 are sequentially arranged between the air return section 1 and the rotating wheel dehumidification section 4 from front to back, a water outlet of the front replacement hot section 3 is converged with the first circulation pipeline 23 through a first branch pipe 42, and a water inlet of the front replacement hot section 3 is converged with the second circulation pipeline 24 through a second branch pipe 19;
the refrigeration unit 14 is connected with the plate type heat exchanger 15 in parallel, one end of the first circulation pipeline 23 close to the refrigeration unit 14 is divided into two branches, namely a first branch 36 and a second branch 37, the first branch 36 is communicated with an evaporator inlet of the refrigeration unit 14, the second branch 37 is communicated with a primary side inlet of the plate type heat exchanger 15, one end of the second circulation pipeline 24 close to the refrigeration unit 14 is divided into two branches, namely a third branch 38 and a fourth branch 39, the third branch 38 is communicated with an evaporator outlet of the refrigeration unit 14, and the fourth branch 39 is communicated with a primary side outlet of the plate type heat exchanger 15;
the fourth circulation pipeline 26 is provided with a cooling water storage tank 17, one end of the fourth circulation pipeline 26 close to the refrigerating unit 14 is divided into two branches, namely a fifth branch 40 and a sixth branch 41, the fifth branch 40 is communicated with a condenser inlet of the refrigerating unit 14, the sixth branch 41 is communicated with a secondary side inlet of the plate heat exchanger 15, and a secondary side outlet of the plate heat exchanger 15 is communicated with the third circulation pipeline 25;
the first branch 36, the second branch 37, the fifth branch 40 and the sixth branch 41 are provided with an electric switch valve V1, an electric switch valve V2, an electric switch valve V3 and an electric switch valve V4, and the four electric switch valves are controlled by a PLC controller;
the regenerative heater 9 is connected with a heat recoverer 8, the heat recoverer 8 is provided with a regenerative fresh air inlet 30, a regenerative fresh air outlet 31, a high-temperature side inlet 34 and a high-temperature side outlet 35, wherein an outlet of the regenerative fan 10 is communicated with the high-temperature side inlet 34, and the high-temperature side outlet 35 is connected with outdoor atmosphere;
and a flow equalizing section 7 is also arranged between the fan section 6 and the casting shop 28, an air outlet 22 is formed in the flow equalizing section 7, and the air outlet 22 is communicated with an air supply pipe 29.
The utility model discloses an energy-conserving constant temperature accuse wet air conditioning system's of usable cooling tower cooling in winter accuse temperature dehumidification method, its special character lies in including following step:
1. the air in the casting shop 28 is delivered to the air return section 1 through the air return pipe 27;
the air return section 1 is also communicated with external fresh air, so that the air quality of a workshop is improved, and the micro-positive pressure of the workshop can be kept;
the outlet of the air return section 1 is also communicated with a filtering section 2 to remove dust in a workshop;
the outlet of the filtering section 2 is also communicated with a front replacement hot section 3, and preliminary dehumidification is carried out through the front replacement hot section 3;
2. the air output from the air return section 1 is input into the rotary wheel dehumidification section 4 for deep dehumidification, and as the regeneration zone inlet 32 of the rotary wheel dehumidification section 4 is provided with the regeneration heater 9 and the regeneration zone outlet 33 of the rotary wheel dehumidification section 4 is provided with the regeneration fan 10, the moisture absorbent in the rotary wheel regeneration zone can be continuously regenerated, so that the rotary wheel dehumidification section 4 can be continuously provided with moisture absorption performance;
the regeneration heater 9 is connected with a heat recoverer 8, a regeneration fresh air inlet 30, a high-temperature side inlet 34 and a high-temperature side outlet 35 are arranged on the heat recoverer 8, wherein an outlet of a regeneration fan 10 is communicated with the high-temperature side inlet 34, the high-temperature side outlet 35 is connected with outdoor atmosphere, the regeneration fresh air enters the regeneration heater 9 after being preheated by the heat recoverer 8, high-temperature and high-humidity air from the regeneration fan 10 is input into the heat recoverer 8 through the high-temperature side inlet 34, and waste heat is used for preheating the regeneration fresh air, so that the air inlet temperature is increased;
3. the dehumidified air enters the rear heat exchange section 5 to be cooled, the rear heat exchange section 5 is connected with the refrigerating unit 14 and the plate heat exchanger 15, when the outdoor wet bulb temperature is lower than 5 ℃, the PLC controller controls the electric switch valve V1 to be closed, the electric switch valve V2 to be opened, the electric switch valve V3 to be closed and the electric switch valve V4 to be opened, so that the refrigerating unit 14 is disconnected, the plate heat exchanger 15 and the cooling tower 18 are used for cooling, and when the outdoor wet bulb temperature is higher than 5 ℃, the plate heat exchanger 15 is disconnected, and the refrigerating unit 14 is used for cooling; different wet bulb temperatures can be set according to the load condition of the air conditioner, and the PLC control system switches the cooling working condition of the refrigerating machine and the cooling working condition of the cooling tower according to the set wet bulb temperatures; the opening degree of the electric regulating valve 11 is controlled through a PLC controller, so that temperature regulation is realized;
4. the air after temperature reduction and humidity reduction is conveyed to a casting shop 28 through a fan section 6;
and a flow equalizing section 7 is also arranged between the fan section 6 and the casting shop 28, and the flow equalizing section 7 can reduce airflow disturbance and stably convey air to the casting shop 28.
The utility model has the advantages that:
1. the switching between the refrigerating machine cooling condition and the cooling tower cooling condition is carried out according to the outdoor wet bulb temperature, the water supply temperature of cooling water under the refrigerating machine unit cooling condition is not lower than 16 ℃, the problem that the chilled water cannot be normally supplied due to the fact that a water chilling unit cannot normally operate under a low-temperature environment is solved, the failure rate of equipment is reduced, and the operation condition of the equipment is improved;
2. when the requirement of the minimum water supply temperature of the cooling water is not met due to too low outdoor temperature, the water chilling unit cannot run, the cooling tower supplies cold in winter, the natural cold source is used for supplying cold, the cold supply requirement of process production is met, and compared with direct cold supply of a refrigerating unit, the water chilling unit does not need to run, so that the energy consumption of a motor of the water chilling unit is saved, the remarkable energy-saving effect is achieved, and the energy consumption is reduced;
3. the cooling water storage tank can be used for cold accumulation under the condition of low production load, and a natural cold source is utilized to the maximum extent;
4. the temperature and humidity independent control air conditioning system and the constant temperature and humidity control method aiming at the low-humidity production environment requirement are provided;
5. the waste heat of the high-temperature high-humidity waste gas is recycled for preheating the regenerated fresh air, so that the air inlet temperature is improved, the consumption of energy sources such as electric energy and steam is reduced, and the operation cost is saved.
The system is economical, efficient, advanced in control, safe, reliable and easy to popularize and apply.
Drawings
FIG. 1: the utility model relates to a structure schematic diagram of an embodiment 1 of an energy-saving constant-temperature humidity-control air conditioning system which can utilize a cooling tower for cooling in winter;
FIG. 2: the utility model relates to a wet air conditioning system embodiment 2's of energy-conserving constant temperature accuse of usable cooling tower cooling in winter structural schematic.
In the figure: 1. a return air section; 2. a filtration section; 3. a front displacement hot section; 4. a rotary wheel dehumidification section; 5. a post-displacement hot section; 6. a fan section; 7. a current equalizing section; 8. a heat recovery device; 9. a regenerative heater; 10. a regenerative fan; 11. an electric control valve; 12. a temperature and humidity sensor; 13. a chilled water circulation pump; 14. a refrigeration unit; 15. a plate heat exchanger; 16. a cooling water pump; 17. a cooling water storage tank; 18. a cooling tower; 19. a second branch pipe; 20. an air inlet; 21. a fresh air inlet; 22. an air outlet; 23. a first circulation line; 24. a second circulation line; 25. a third circulation line; 26. a fourth circulation line; 27. a return air duct; 28. a foundry; 29. an air supply pipe; 30. a regeneration fresh air inlet; 31. a regenerated fresh air outlet; 32. an inlet of the regeneration zone; 33. a regeneration zone outlet; 34. a high temperature side inlet; 35. a high temperature side outlet; 36. a first branch; 37. a second branch circuit; 38. a third branch; 39. a fourth branch; 40. a fifth branch; 41. a sixth branch; 42. a first branch pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
Referring to fig. 1, the present invention provides an energy-saving constant temperature humidity control air conditioning system capable of using a cooling tower to supply cold in winter, comprising an energy-saving constant temperature humidity control unit for cooling and dehumidifying a foundry 28, the energy-saving constant temperature humidity control unit comprises a return air section 1, a rotary wheel dehumidification section 4, a rear replacement heat section 5 and a fan section 6 which are sequentially communicated from front to rear, a regeneration zone inlet 32 of the rotary wheel dehumidification section 4 is provided with a regeneration heater 9, a regeneration zone outlet 33 of the rotary wheel dehumidification section 4 is provided with a regeneration fan 10, the return air section 1 is communicated with a return air inlet of the foundry through a return air pipe 27, the fan section 6 is communicated with an air supply outlet of the foundry through an air supply pipe 29, a water outlet of the rear replacement heat section 5 is communicated with an evaporator inlet of a refrigeration unit 14 through a first circulation pipeline 23, a water inlet of the rear replacement heat section 5 is communicated with an evaporator water outlet of the refrigeration unit 14 through a second circulation, install electrical control valve 11 on the first circulation pipeline 23, the condenser delivery port of refrigerating unit 14 has the cooling tower 18 water inlet through third circulation pipeline 25 intercommunication, the condenser water inlet of refrigerating unit 14 has the cooling tower 18 delivery port through fourth circulation pipeline 26 intercommunication, install temperature and humidity sensor 12 on the return air pipe 27, install chilled water circulating pump 13 on the first circulation pipeline 23, install cooling water pump 16 on the fourth circulation pipeline 26, regeneration heater 9, regeneration fan 10, electrical control valve 11, temperature and humidity sensor 12, chilled water circulating pump 13, cooling water pump 16 all is controlled by the PLC controller. Install electric control valve 11 on the first circulation pipeline 23, install the energy-conserving constant temperature accuse wet unit of temperature and humidity sensor 12 on the return air pipe 27 and pass through the PLC controller, according to casting shop return air temperature regulation electric control valve 11's aperture, according to the dehumidification of casting shop return air humidity control runner dehumidification section 4 to realize humiture independent control, improve the atmospheric control precision.
Example 2
Referring to fig. 2, the present embodiment is different from embodiment 1 in that:
the air return section 1 is provided with an air inlet 20 and a fresh air inlet 21, the air inlet 20 is communicated with an air return pipe 27, and the fresh air inlet 21 is communicated with external fresh air; in order to ensure the temperature and humidity stability of a casting workshop, a part of outdoor fresh air can be introduced into the air return section of the constant-temperature humidity control unit, and the fresh air and the return air are mixed and then treated, so that the workshop is in a micro-positive pressure state to prevent the outside air of a drying room from flowing into the workshop, the air quality of the workshop can be improved, and the working environment of workers is improved.
A filtering section 2 and a front replacement hot section 3 are sequentially arranged between the air return section 1 and the rotating wheel dehumidification section 4 from front to back, a water outlet of the front replacement hot section 3 is converged with the first circulation pipeline 23 through a first branch pipe 42, and a water inlet of the front replacement hot section 3 is converged with the second circulation pipeline 24 through a second branch pipe 19; casting shop work piece drying process can produce partly dust, for guaranteeing the normal operating of wet unit of constant temperature accuse, is provided with filter segment 2 in the unit, carries out purification treatment to the circulated air, also can avoid the dust to get into runner dehumidification section runner when improving workshop air quality, ensures the steady operation of system.
In order to enable the water chilling unit to still normally operate when the temperature of cooling water is lower than 16 ℃, the refrigeration unit 14 is connected in parallel with the plate heat exchanger 15, one end of the first circulation pipeline 23, which is close to the refrigeration unit 14, is divided into two branches, namely a first branch 36 and a second branch 37, the first branch 36 is communicated with an evaporator inlet of the refrigeration unit 14, the second branch 37 is communicated with a primary side inlet of the plate heat exchanger 15, one end of the second circulation pipeline 24, which is close to the refrigeration unit 14, is divided into two branches, namely a third branch 38 and a fourth branch 39, the third branch 38 is communicated with an evaporator outlet of the refrigeration unit 14, and the fourth branch 39 is communicated with a primary side outlet of the plate heat exchanger 15;
a cooling water storage tank 17 is installed on the fourth circulation pipeline 26, one end of the fourth circulation pipeline 26 close to the refrigerating unit 14 is divided into two branches, namely a fifth branch 40 and a sixth branch 41, the fifth branch 40 is communicated with a condenser inlet of the refrigerating unit 14, the sixth branch 41 is communicated with a secondary side inlet of the plate heat exchanger 15, and a secondary side outlet of the plate heat exchanger 15 is communicated with the third circulation pipeline 25;
the first branch 36, the second branch 37, the fifth branch 40 and the sixth branch 41 are provided with an electric switch valve V1, an electric switch valve V2, an electric switch valve V3 and an electric switch valve V4, and the electric switch valves are all controlled by a PLC controller;
the regenerative heater 9 is connected with a heat recoverer 8, the heat recoverer 8 is provided with a regenerative fresh air inlet 30, a regenerative fresh air outlet 31, a high-temperature side inlet 34 and a high-temperature side outlet 35, wherein an outlet of the regenerative fan 10 is communicated with the high-temperature side inlet 34, and the high-temperature side outlet 35 is connected with outdoor atmosphere; the rotating wheel dehumidification section 4 mainly absorbs moisture in air by using hydrophilicity of a moisture absorbent, the moisture absorbent material of the rotating wheel is usually silica gel, a molecular sieve, lithium chloride and a composite body of the silica gel, the rotating wheel is of a honeycomb structure, the rotating wheel is divided into two fan-shaped areas by a sealing strip, a processing area with a central angle of 270 degrees and a regeneration area with a central angle of 90 degrees, after the processed wet air passes through the processing area of the rotating wheel dehumidification section, because the water vapor partial pressure of the moisture absorbent in the rotating wheel is lower than the water vapor partial pressure of the processed wet air at normal temperature, the moisture in the processed air is reduced after being absorbed by the moisture absorbent in the rotating wheel, the wet air is dried, the moisture absorbent is saturated to a certain degree, the moisture absorption process is terminated, in order to maintain the performance of the moisture absorbent, the moisture absorbent needs to be regenerated, the regenerated air is firstly preheated by a heat recoverer 8, enters a regeneration heater 9 and is heated to a set regeneration, then enters a regeneration area of a rotating wheel dehumidification section 4, the water vapor partial pressure of air is lower than that of a moisture absorbent in the rotating wheel at high temperature, so that the originally adsorbed water is desorbed, the moisture absorbent is fully regenerated, the rotating wheel recovers the moisture absorption capacity, the regenerated fresh air passing through the regeneration area of the rotating wheel is changed into wet air with large moisture content, and then enters a heat recovery device 8 through a regeneration fan 10 to exchange heat with the regenerated fresh air and then is discharged to the outside, and the heat recovery device 8 can adopt a plate type heat exchanger, a heat pipe type heat exchanger, a shell and tube type heat exchanger and other forms to realize the gas-gas heat exchange.
A flow equalizing section 7 is further arranged between the fan section 6 and the casting shop 28, an air outlet 22 is formed in the flow equalizing section 7, and the air outlet 22 is communicated with an air supply pipe 29.
The following table shows the operating logic of the control device under different operating conditions:
valve state under different working conditions
Example 3
The temperature control dehumidification method of the energy-saving constant-temperature humidity control air conditioning system capable of utilizing the cooling tower for cooling in winter in the embodiment refers to the attached drawing 2, and includes the following steps:
1. the air in the casting shop 28 is delivered to the air return section 1 through the air return pipe 27;
the air return section 1 is also communicated with external fresh air, so that the air quality of a workshop is improved, and the micro-positive pressure of the workshop can be kept;
the output end of the air return section 1 is also communicated with a filtering section 2 to remove dust in a workshop;
the output end of the filtering section 2 is also communicated with a front replacement hot section 3, and preliminary dehumidification is carried out through the front replacement hot section 3;
2. the air output from the air return section 1 is input into the rotary wheel dehumidification section 4 for deep dehumidification, and as the regeneration zone inlet 32 of the rotary wheel dehumidification section 4 is provided with the regeneration heater 9 and the regeneration zone outlet 33 of the rotary wheel dehumidification section 4 is provided with the regeneration fan 10, the moisture absorbent in the rotary wheel regeneration zone can be continuously regenerated, so that the rotary wheel dehumidification section 4 can be continuously provided with moisture absorption performance;
the regenerative heater 9 is connected with a heat recoverer 8, a regenerative fresh air inlet 30, a high-temperature side inlet 34 and a high-temperature side outlet 35 are arranged on the heat recoverer 8, wherein an outlet of a regenerative fan 10 is communicated with the high-temperature side inlet 34, the high-temperature side outlet 35 is connected with outdoor atmosphere, the regenerative fresh air enters the regenerative heater 9 after being preheated by the heat recoverer 8, high-temperature and high-humidity air from the regenerative fan 10 is input into the heat recoverer 8 through the high-temperature side inlet 34, and waste heat is used for preheating the regenerative fresh air, so that the inlet air temperature is increased;
3. the dehumidified air enters the rear heat exchange section 5 to be cooled, the rear heat exchange section 5 is connected with the refrigerating unit 14 and the plate heat exchanger 15, when the outdoor wet bulb temperature is lower than 5 ℃, the PLC controller controls the electric switch valve V1 to be closed, the electric switch valve V2 to be opened, the electric switch valve V3 to be closed and the electric switch valve V4 to be opened, so that the refrigerating unit 14 is disconnected, the plate heat exchanger 15 and the cooling tower 18 are used for cooling, and when the outdoor wet bulb temperature is higher than 5 ℃, the plate heat exchanger 15 is disconnected, and the refrigerating unit 14 is used for cooling; different wet bulb temperatures can be set according to the load condition of the air conditioner, and the PLC control system switches the cooling working condition of the refrigerating machine and the cooling working condition of the cooling tower according to the set wet bulb temperatures; the opening degree of the electric regulating valve 11 is controlled by a PLC controller, so that the temperature regulation of the shell-making drying room is realized;
4. the air after temperature reduction and humidity reduction is conveyed to a casting shop 28 through a fan section 6;
and a flow equalizing section 7 is also arranged between the fan section 6 and the casting shop 28, and the flow equalizing section 7 can reduce airflow disturbance and stably convey air to the casting shop 28.
Example 4
The temperature of a drying room of a shell manufacturing and drying company of Qingdao in the embodiment is required to be 22-24 ℃, and the humidity is 30-40%; the design parameters are that the temperature is 23 ℃, the humidity is 35 percent, and the moisture content is 6.9 g/kg; carrying out fresh air volume 600m plantation at 35 ℃ and moisture content of 24.3 g/kg; carrying out workshop air return 8400m for carrying out labor/hour, wherein the temperature of the mixed fresh air and the workshop air is 23.6 ℃, and the moisture content is 8.1 g/kg; the temperature of the mixed air after being treated by the front replacement thermal section is 13 ℃, and the moisture content is 8.1 g/kg; after dehumidification in the treatment area of the rotary wheel dehumidification section 4, the temperature is 30 ℃, and the moisture content is 3.1 g/kg; then the temperature is 16 ℃ after the treatment of the post-displacement hot section 5, and the moisture content is 3.1 g/kg; the treated drying air is fed to the drying room via the fan section 6.
The temperature of the regenerated fresh air is 35 ℃, the temperature of the regenerated fresh air is 58 ℃ after being heated by the heat recovery device 8, the regenerated fresh air is heated to 120 ℃ by the regenerative heater 9 and enters a rotating wheel regeneration area of the rotating wheel dehumidification section 4 to regenerate the rotating wheel moisture absorbent, the air temperature of an outlet 33 of the rotating wheel regeneration area is 70 ℃, the regenerated fresh air is conveyed to the heat recovery device 8 through the regenerative fan 10 to exchange heat with the regenerated fresh air, and the temperature of the regenerated exhaust air after heat exchange is 42 ℃.
When outdoor wet bulb temperature is less than 5 ℃, the cooling temperature of the cooling tower 18 can reach 7-10 ℃, the temperature required by a workshop is 23 ℃, the requirement for workshop cooling is met, compared with the direct cooling of a water chilling unit, the cooling of the cooling tower and the plate heat exchanger saves the electric quantity of the water chilling unit during operation, and the operation cost is saved. Taking a refrigeration capacity 372KW refrigerating unit as an example, the running power of the unit is 63KW, the power of a cooling water pump is 15KW, the power of a cooling tower fan is 7.5KW, and the power of a chilled water circulating pump is 11 KW; when the water chilling unit is used for directly supplying cold, the maximum running power is 96.5KW, when the cooling tower is used for supplying cold, the maximum running power is 33.5KW, and compared with the direct cooling of the water chilling unit, the cooling tower and the plate heat exchanger can save the power consumption of 63KWH per hour.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. An energy-saving constant-temperature humidity control air conditioning system capable of supplying cold by utilizing a cooling tower in winter is characterized by comprising an energy-saving constant-temperature humidity control unit for cooling and dehumidifying a casting shop, wherein the energy-saving constant-temperature humidity control unit comprises an air return section, a rotating wheel dehumidification section, a rear heat exchange section and a fan section which are sequentially communicated from front to back, a regeneration heater is arranged on an inlet of a regeneration area of the rotating wheel dehumidification section, a regeneration fan is arranged on an outlet of a regeneration area of the rotating wheel dehumidification section, the air return section is communicated with an air return opening of the casting shop through an air return pipe, the fan section is communicated with an air supply opening of the casting shop through an air supply pipe, a water outlet of the rear heat exchange section is communicated with an evaporator inlet of the refrigerating unit through a first circulating pipeline, a water inlet of the rear heat exchange section is communicated with a water outlet of an evaporator of the refrigerating unit through a second circulating pipeline, an electric regulating valve is arranged on the first circulating pipeline, a water inlet of a condenser of the refrigerating unit is communicated with a water outlet of the cooling tower through a fourth circulating pipeline, a temperature and humidity sensor is installed on the air return pipe, a chilled water circulating pump is installed on the first circulating pipeline, a cooling water pump is installed on the fourth circulating pipeline, and the regenerative heater, the regenerative fan, the electric regulating valve, the temperature and humidity sensor, the chilled water circulating pump and the cooling water pump are controlled by the PLC.
2. The energy-saving constant-temperature humidity-control air-conditioning system capable of supplying cold in winter by utilizing the cooling tower as claimed in claim 1, wherein the air return section is provided with an air inlet and a fresh air inlet, the air inlet is communicated with the air return pipe, and the fresh air inlet is communicated with external fresh air.
3. The energy-saving constant-temperature humidity-controlling air-conditioning system capable of utilizing the cooling tower to supply cold in winter as claimed in claim 1, wherein a filtering section and a front heat-exchanging section are sequentially arranged between the air return section and the rotary wheel dehumidification section from front to back, the water outlet of the front heat-exchanging section is converged with the first circulation pipeline through a first branch pipe, and the water outlet of the front filtering section is converged with the second circulation pipeline through a second branch pipe.
4. An energy-saving constant-temperature humidity-controlling air conditioning system capable of using a cooling tower for cooling in winter as claimed in claim 1, wherein the refrigerating unit is connected in parallel with a plate heat exchanger, the first circulation pipeline is divided into two branches near one end of the refrigerating unit, the first branch is a first branch and a second branch, the first branch is communicated with the evaporator inlet of the refrigerating unit, the second branch is communicated with the primary side inlet of the plate heat exchanger, the second circulation pipeline is divided into two branches near one end of the refrigerating unit, the third branch is a third branch and a fourth branch, the third branch is communicated with the evaporator outlet of the refrigerating unit, and the fourth branch is communicated with the primary side outlet of the plate heat exchanger.
5. The energy-saving constant-temperature humidity-controlling air conditioning system capable of supplying cold in winter by utilizing the cooling tower as claimed in claim 4, wherein the fourth circulating pipeline is provided with a cooling water storage tank, one end of the fourth circulating pipeline close to the refrigerating unit is divided into a fifth branch and a sixth branch, the fifth branch is communicated with the inlet of the condenser of the refrigerating unit, the sixth branch is communicated with the inlet of the secondary side of the plate heat exchanger, and the outlet of the secondary side of the plate heat exchanger is communicated with the third circulating pipeline.
6. The energy-saving constant-temperature humidity-control air-conditioning system capable of utilizing the cooling tower for cooling in winter as claimed in claim 5, wherein the first branch, the second branch, the fifth branch and the sixth branch are respectively provided with an electric switch valve V1, an electric switch valve V2, an electric switch valve V3 and an electric switch valve V4, and the four electric valves are controlled by a PLC controller.
7. The system of claim 1, wherein the regenerative heater is connected to a heat recovery unit having a fresh air inlet, a fresh air outlet, a high temperature side inlet, and a high temperature side outlet, wherein the outlet of the regeneration fan is connected to the high temperature side inlet, and the high temperature side outlet is connected to the outdoor atmosphere.
8. The energy-saving constant-temperature humidity-controlling air-conditioning system capable of utilizing the cooling tower for cooling in winter as claimed in claim 1, wherein a flow equalizing section is further arranged between the fan section and the foundry, an air outlet is formed in the flow equalizing section, and the air outlet is communicated with the blast pipe.
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| CN202020671382.1U CN212157493U (en) | 2020-04-28 | 2020-04-28 | Energy-saving constant-temperature humidity-control air conditioning system capable of utilizing cooling tower to supply cold in winter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111457514A (en) * | 2020-04-28 | 2020-07-28 | 烟台泓麟制冷空调工程有限公司 | Energy-saving constant-temperature humidity-control air conditioning system capable of supplying cold in winter by utilizing cooling tower and temperature-control dehumidification method |
| CN112807932A (en) * | 2021-01-05 | 2021-05-18 | 湖南中冶长天节能环保技术有限公司 | Method for optimally controlling discharge temperature of desorption tower and cooling air system |
-
2020
- 2020-04-28 CN CN202020671382.1U patent/CN212157493U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111457514A (en) * | 2020-04-28 | 2020-07-28 | 烟台泓麟制冷空调工程有限公司 | Energy-saving constant-temperature humidity-control air conditioning system capable of supplying cold in winter by utilizing cooling tower and temperature-control dehumidification method |
| CN111457514B (en) * | 2020-04-28 | 2024-01-02 | 山东泓麟环境工程技术有限公司 | Energy-saving constant-temperature humidity control air conditioning system capable of utilizing cooling tower for cooling in winter and temperature control dehumidification method |
| CN112807932A (en) * | 2021-01-05 | 2021-05-18 | 湖南中冶长天节能环保技术有限公司 | Method for optimally controlling discharge temperature of desorption tower and cooling air system |
| CN112807932B (en) * | 2021-01-05 | 2022-06-07 | 湖南中冶长天节能环保技术有限公司 | Method for optimally controlling discharge temperature of desorption tower and cooling air system |
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