CN110953176A - Adjustment control method for improving dew point temperature of compressed air - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001816 cooling Methods 0.000 claims abstract description 48
- 238000007906 compression Methods 0.000 claims abstract description 43
- 230000006835 compression Effects 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 239000000498 cooling water Substances 0.000 claims description 28
- 230000008929 regeneration Effects 0.000 abstract description 15
- 238000011069 regeneration method Methods 0.000 abstract description 15
- 230000005611 electricity Effects 0.000 abstract 1
- 239000003463 adsorbent Substances 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 10
- 230000001105 regulatory effect Effects 0.000 description 10
- 238000005070 sampling Methods 0.000 description 9
- 229920006395 saturated elastomer Polymers 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 8
- 238000001035 drying Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000945 filler Substances 0.000 description 5
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- 239000000428 dust Substances 0.000 description 2
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- 239000007787 solid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 239000002274 desiccant Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/163—Combinations of two or more pumps ; Producing two or more separate gas flows driven by a common gearing arrangement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/006—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by influencing fluid temperatures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling or heating the machine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
- F04D29/706—Humidity separation
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Drying Of Gases (AREA)
Abstract
The invention relates to an adjusting and controlling method for improving dew point temperature of compressed air, wherein the compressed air is prepared by an air compression system consisting of compression devices connected in series in multiple stages, a cooler for cooling the compressed air is arranged between the two adjacent stages of compression devices, and an exhaust port of the air compression system is connected with an air inlet of a dryer; the method comprises the following steps: detecting the ambient temperature of the air inlet of the suction dryer, adjusting the dew point temperature set value of the suction dryer according to the ambient temperature, automatically setting the dew point temperature of the suction dryer to-35 ℃ when the ambient temperature is lower than 15 ℃ for 24 continuous hours, and automatically setting the dew point temperature of the suction dryer to-30 ℃ when the ambient temperature is higher than or equal to 15 ℃ for 24 continuous hours. The method saves electricity consumption, shortens the regeneration time of the suction dryer, prolongs the service life of the suction dryer, and reduces manual adjustment, thereby greatly saving manpower.
Description
Technical Field
The invention relates to an adjusting and controlling method for improving the dew point temperature of compressed air, belonging to the technical field of air dew point control.
Background
The dew point temperature of compressed air is also called the compressed air dew point, and in meteorology, it is the temperature to which the gaseous water contained in the air is saturated and condensed into liquid water at a fixed air pressure. When the temperature of the air is reduced to the temperature, water vapor in the air is condensed into water drops, and then a part of the water drops floats in the air, namely the fog which is often seen by people; the other part can be attached on the surface of the solid to form the field dew in the morning in the late autumn, so the name of the dew point is two characters. The physical meaning of the dew point of air is the volume concentration of water vapor in air, in g/m3. It is understood that when the water content per unit volume is high, the dew point value of the gas is high, the water content per unit volume is low, and the dew point value is low.
At present, compressed air is increasingly widely applied to various production fields, and is particularly widely applied to large-scale steel enterprises as a power gas, an instrument gas, a process system gas or a compressed air ash conveying system. The modern medicine, food manufacturing enterprise, large-scale steel enterprise, use compressed air in a large amount in the automated production, and different compressed air application occasions have proposed the requirement of different quality grades to the air supply quality of compressed air again. Regardless of whether a screw compressor, a piston compressor or a centrifugal compressor is adopted to obtain compressor air, when the compression ratio in the compressor is more than 3, the externally supplied compressed air is easy to condense and separate out moisture in the long-distance pipeline conveying process.
Compressed air is generally specified by the quality grade of compressed air according to GB/T13277.1-2008, the water content grade of the compressed air is 7 grades, the dew points of the compressed air with the grade of 1-3 are all below minus 20 ℃, and the low dew points can be achieved only by adopting a suction dryer. The plum steel air compression system is widely applied to opening and closing of starting valves, dry dust removal of sintering desulfurization systems, pneumatic transmission of solid powder particles and the like in production sites of various secondary plants, and has very strict requirements on the dew point of compressed air, namely, the requirement of the dew point is above three-level standards, namely, the dew point is below-20 ℃.
Taking plum steel as an example, the air compression system adopting three-stage compression and three-stage cooling at present adopts a centrifugal compressor with higher pressure in order to reduce the compression power consumption because the temperature of the air is increased in the compression process, adopts intermediate cooling in the compression process, leads the compressed air to an external intercooler for cooling through a volute chamber and an air outlet pipe, and leads the cooled low-temperature air to enter the next stage for compression through an air suction chamber. In the actual production process, a suction-type dryer is adopted to treat compressed air, and the principle of the suction-type compressed air is as follows: at a certain temperature, the adsorption amount of water in the drying agent is increased along with the increase of the water vapor partial pressure in the gas phase, at a certain pressure, the adsorption amount of water is reduced along with the increase of the temperature, namely, the water is adsorbed under the condition of high pressure or low temperature, the water is desorbed under the condition of low pressure or high temperature, and when the wet compressed air passes through a packed tower with the adsorbent by adopting a physical adsorption method and is in full contact with the packed tower, the water molecules are adsorbed by the adsorbent due to Van der Waals attraction. After the adsorbent is adsorbed and dried for a period of time, the water content of the adsorbent is saturated, and at the moment, the dew point becomes poor, drying and heating are needed to separate out saturated water in the adsorbent, so that the activity of the adsorbent is recovered. According to the experience of the plum steel in practical application, after the air temperature suddenly drops in winter, the user side is easy to separate out water, so that the pneumatic valve cannot work, the main line production is influenced, and the dew point temperature of the suction dryer in winter can be set to be-35 ℃.
However, in the practical process of the applicant, the load of the suction dryer is increased at high temperature in summer and low temperature in winter, the power consumption is increased, and even the adsorbent is possibly failed, so that the production efficiency is reduced.
Disclosure of Invention
The invention aims to solve the technical problems that: the adjustment and control method for the dew point temperature of the compressed air is energy-saving and environment-friendly, and can reduce the regeneration and heating time of the adsorbent of the suction dryer.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a regulation control method for improving dew point temperature of compressed air is characterized in that the compressed air is prepared by an air compression system consisting of a plurality of stages of compression devices connected in series, a cooler for cooling the compressed air is arranged between two adjacent stages of compression devices, and an exhaust port of the air compression system is connected with an air inlet of a suction dryer; the method comprises the following steps: detecting the ambient temperature of the air inlet of the suction dryer, adjusting the dew point temperature set value of the suction dryer according to the ambient temperature, automatically setting the dew point temperature of the suction dryer to-35 ℃ when the ambient temperature is lower than 15 ℃ for 24 continuous hours, and automatically setting the dew point temperature of the suction dryer to-30 ℃ when the ambient temperature is higher than or equal to 15 ℃ for 24 continuous hours.
In practical production, the applicant finds that in the prior art, whether in winter in low-temperature seasons or in weather with average air temperature of more than 15 ℃, the dew point of the compressed air at the outlet of the suction dryer is always controlled to be-35 ℃. On the other hand, in the weather of the average temperature of more than 15 ℃, if the dew point of the compressed air is still set to-35 ℃ in the suction dryer, the heating and cooling time is too long when the dry filler (adsorbent) is regenerated. The standard air blast heating time is shortest to one hour, the air blast cooling time is shortest to one hour, but the actual heating time may be different from 130min to 190min, and the cooling time is different from 70 min to 90min, in this case, after the air dew point of two towers is reduced, the dry filler (adsorbent) of the other tower is not regenerated, so that the production efficiency is seriously influenced.
When the environmental temperature is greater than or equal to 15 ℃ for 24 hours continuously, the dew point temperature of the suction dryer is automatically set to be-30 ℃, so that the heating and cooling time of the dry filler (adsorbent) during regeneration is reduced, the problem of long regeneration time of the suction dryer is solved, and the regeneration time basically meets the standard time, thereby improving the production efficiency and the control accuracy. And the heating regeneration time of the absorption dryer is obviously reduced from the original 3 hours to the current 1.5 hours in high-temperature seasons in summer, so that the switching time difference between the regeneration of the absorption dryer and the regeneration of the other tower can be timely completed after the dew point of one tower of the absorption dryer is reduced.
The dew point temperature of the drying machine is automatically adjusted through the environmental temperature in winter, and the exhaust temperature of the air compression system is less than 40 ℃ through the automatic adjusting cooling device at high temperature, so that the labor intensity is reduced, the labor efficiency is improved, the accuracy of temperature control is improved, meanwhile, the dew point control temperature of the air compressed by the drying machine is dynamically adjusted according to different environmental temperatures, the regeneration time is reduced, the regeneration power consumption is reduced, and the drying machine has the characteristics of high efficiency, environmental protection, energy conservation, emission reduction, low maintenance cost, easiness in popularization and the like.
The further improvement of the technical scheme is as follows: the exhaust temperature of the air compression system is adjusted to be less than 40 degrees by automatically controlling the cooler through the PLC. Preferably, the cooler is a water-cooling cooler which is supplied with water circularly by a cooling tower; when the exhaust temperature of the air compression system is higher than 40 ℃, the PLC controls the start and stop of the fan of the cooling tower to enable the water temperature of the water outlet main pipe of the cooling tower to be lower than 25 ℃, and if the fan runs at full load, the exhaust temperature of the air compression system is still higher than 40 ℃, cooling water is supplemented from the outside to the cooling tower.
The applicant finds that the room temperature generally rises to 30 ℃ along with the coming of a high-temperature season in summer, the exhaust temperature of an air compression system rises obviously, the exhaust temperature of compressed air reaches 50.3 ℃ at most in the high-temperature period in summer and is far greater than the standard temperature of an inlet of a suction dryer by 40 ℃, the high exhaust temperature can seriously affect the dew point of the compressed air of a subsequent suction dryer, and the dew point of the suction dryer cannot reach-30 ℃, which is a main factor affecting the dew point of the suction dryer. Once the temperature of the inlet air of the suction dryer is too high, the dew point temperature of the compressed air is greatly influenced, and the failure of the alumina of the filler of the dryer is easily caused.
The main performance of analyzing the damage of overhigh inlet temperature of the suction dryer is as follows: the saturated water content in the compressed air with high temperature is greatly increased. The compressed air entering the dryer is generally in a saturated state, the higher the temperature is, the more the water content is, the greater the load of the dryer is, so that the dew point of the air at the outlet is raised. Before the inlet air temperature is 30 ℃, the water content of the saturated humidity is continuously and slowly increased and kept at 30 g/m3The saturated moisture content rapidly increases with further temperature increase, and the increase is obvious, and the saturated moisture content is as high as 65.5 g/m at 45 DEG C3. It can be seen that the water content doubles more and more at a temperature rise of 15 ℃ and increases further and further.
According to the field condition of the plum steel, the inlet air temperature of the three-air-pressure suction dryer in summerThe temperature fluctuates between 38 ℃ and 49 ℃. The average inlet air temperature is 45 ℃, and the water amount entering the suction dryer is 65.5 g/m3If the temperature of the exhaust air can be reduced by 7 deg.C (i.e., reduced to 38 deg.C), which is also the ideal temperature for compressed air entering the suction dryer under normal circumstances, the saturated humidity in the compressed air at that temperature is 46.3 g/m3. Compared with the condition that the inlet air temperature is 45 ℃, the water amount entering the suction dryer is reduced by 19.3 g/m3The water content was reduced by 29.5%. Delivering 8.6 ten thousand meters per hour by using three-air pressure3Compressed air is taken as an example. Then 1672 kg more water per hour are sucked out by 6 dryers, i.e. 1.6 t more water per hour can meet the dew point requirement.
Because the water absorbed by the suction dryer consumes electric energy for heating regeneration, the reduction of the air inlet temperature means energy conservation, and under the same dehumidification efficiency, the reduction of the air inlet temperature of the suction dryer can directly reduce the dew point of an outlet, greatly reduce the load of the suction dryer and bring considerable energy-saving benefit.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present invention.
Detailed Description
Examples
As shown in fig. 1, in the present embodiment, the compressed air is made by an air compression system composed of three stages of compression devices connected in series, a cooler for cooling the compressed air is provided between two adjacent stages of compression devices, and an air outlet of the air compression system is connected to an air inlet of the dryer. Compressed air is sucked into the system from an inlet pipeline 1, after the outside air temperature is measured through an inlet temperature sampling point 2, impurities such as dust in the air are filtered through an inlet air filter element 3, the air enters a first-stage cylinder 4 of a centrifugal compressor under the drive of a centrifugal machine gear box 28, enters a primary cooler 5 for cooling through first-stage compression, enters a second-stage cylinder 6 of the centrifugal compressor for compression and pressure boosting, enters a middle cooler 7 for cooling, is compressed through a third-stage cylinder 8 of a last-stage centrifugal compressor, is heated and is boosted, and then enters a final cooler 9 for final cooling. The compressed air after three-stage compression requires pressure of 0.65MPa and temperature below 40 ℃, finally enters a compressed air drying treatment system suction dryer 11 through an exhaust sampling point 10, becomes qualified clean compressed air after the air dew point meets the requirement after drying treatment, and enters an air storage tank 12 to be delivered to a pipe network to be used by each user.
The adjusting and controlling method for improving the dew point temperature of the compressed air comprises the following steps: the temperature of the air inlet of the suction dryer is detected at an inlet temperature sampling point 2 to be used as the ambient temperature, the dew point temperature setting value of the suction dryer is adjusted according to the ambient temperature, when the ambient temperature is lower than 15 ℃ for 24 hours continuously, the dew point temperature of the suction dryer is automatically set to be-35 ℃, and when the ambient temperature is higher than or equal to 15 ℃ for 24 hours continuously, the dew point temperature of the suction dryer is automatically set to be-30 ℃. The requirement of dew point control under the different ambient temperature condition can be satisfied like this, according to the nimble regulation of the automatic difference of ambient temperature's change, compressed air external supply quality can be guaranteed, the precipitation of pipe network comdenstion water in winter is reduced, can save the suction drier regeneration time that significantly reduces again in non-winter, improved the control precision.
The embodiment can be further modified as follows: the exhaust temperature of the air compression system is adjusted to be less than 40 degrees by automatically controlling the cooler through the PLC. When the cooling device is implemented, the cooler is a water-cooling cooler which is supplied with water by a cooling tower in a circulating manner; when the exhaust temperature of the air compression system is higher than 40 ℃, the PLC controls the start and stop of the fan of the cooling tower to enable the water temperature of the water outlet main pipe of the cooling tower to be lower than 25 ℃, if the fan runs at full load, the exhaust temperature of the air compression system is still higher than 40 ℃, cooling water is supplemented into the cooling tower from the outside, namely the opening degree of a cooling water inlet valve is increased, and therefore the exhaust temperature of the air compression system is enabled to be lower than 40 ℃.
As shown in fig. 1, in this embodiment, electric control valves 14, 17, and 20 are respectively installed on cooling water inlet pipes 13, 16, and 19 of a primary cooler 5, an intermediate cooler 7, and a final cooler 9 of an air compression system, cooling water controls water flow rate flowing into the coolers through the electric control valves, the cooling water absorbs heat of compressed air, after temperature rise, the cooling water is converged into a water inlet header 22 of a cooling tower through cooling water outlet pipes 15, 18, and 21, and then enters a mechanical ventilation cooling tower 24 and a cooling tower 25 for temperature reduction, and cooling circulating water cooled by the cooling tower is subjected to temperature measurement from a cooling water outlet header 30 through a water outlet header temperature sampling point 27, and then is supplied to each cooler for circulating cooling of compressed air.
In order to ensure that the exhaust temperature of compressed air is below 40 ℃, on one hand, the cooling water has a cooling effect, the temperature of the cooling water outlet header pipe is required to be controlled to be less than or equal to 25 ℃, the temperature of the cooling water is detected at a temperature sampling point 27 of the cooling water outlet header pipe, whether the temperature of the cooling water exceeds 25 ℃ is judged, and therefore, the start and stop of cooling tower fans 24 and 25 are controlled by a PLC (programmable logic controller), the temperature of the cooling water sent into a cooling system is reduced, if the temperature of the two cooling tower fans is fully opened, the temperature is still greater than 25 ℃, the water inlet header pipe 22 of the cooling tower is controlled by an added electric regulating valve 23 to be supplemented into a cooling water pool, the effects of regulating the water flow of circulating cooling water and reducing the water temperature of the circulating cooling water are achieved, and the PLC automatically controls the electric regulating valve 23 to increase. On the other hand, the opening degree of cooling water inlet valves of the three coolers is controlled, the system detects whether the exhaust temperature of compressed air after three-stage compression exceeds 40 ℃ through an exhaust temperature sampling point 10, the opening degree of each inlet electric regulating valve of the three-stage cooler is controlled through a PLC according to the detection result, the opening degree of each inlet electric regulating valve of the three-stage cooler is linked with the exhaust temperature of the compressor, and after the exhaust temperature is detected to exceed 40 ℃, the opening degree of each inlet electric regulating valve of the cooler is increased, and the exhaust temperature of the cooler is reduced to be below 40 ℃.
The improved technical scheme of the embodiment comprises the following specific operation steps:
1) an inlet temperature sampling point 2 detects the external environment temperature;
2) when the external environment temperature is lower than 15 ℃ for 24 hours continuously, the default winter state is entered, the dew point of the suction drier is automatically set to be-35 ℃ through a PLC (programmable logic controller), and when the external environment temperature is higher than 15 ℃ for 24 hours continuously, the default winter state is ended, the dew point of the suction drier is automatically set to be-30 ℃;
3) detecting the temperature of cooling water through a temperature sampling point 27 of a cooling water outlet main pipe;
4) the temperature of the cooling water is more than or equal to 25 ℃, and the opening of the fans of the cooling towers 24 and 25 is sequentially controlled by a PLC;
5) if the fully-opened water inlet temperature of the two cooling tower fans is still higher than 25 ℃, the PLC automatically controls the electric regulating valve 23 to increase the amount of the reuse water to be supplemented to the cooling water pool until the purpose of cooling water below 25 ℃ is achieved;
6) if the temperature of the cooling water is less than or equal to 25 ℃, the PLC judges that the electric regulating valve 22 is automatically closed to reduce the water amount supplemented to the cooling water pool; secondly, the PLC closes the cooling tower fans 24 and 25 in sequence, so that the aim of automatically closing the cooling tower fans to reduce power consumption in winter is fulfilled;
7) detecting the exhaust temperature of the compressed air after the three-stage compression through an exhaust temperature sampling point 10; when the temperature of the three-stage compression exhaust is higher than 40 ℃, the opening of the electric regulating valve at the inlet of the three-stage cooler is interlocked with the exhaust temperature of the compressor through the PLC, the opening of the electric regulating valve at the inlet of the cooler is increased, and the exhaust temperature of the cooler is reduced to be below 40 ℃.
The method of the invention automatically and flexibly adjusts the dew point setting of the suction dryer after automatic detection according to the change of the external environment temperature, thereby reducing the regeneration time of the suction dryer and reducing the power consumption. On the other hand, the three coolers are automatically adjusted in a linkage manner to adjust the water inlet flow, the cooling fans of the cooling tower are automatically adjusted in a linkage manner to start and stop, the amount of the recycled water is automatically adjusted to be supplemented to the cooling water pool, the exhaust temperature of the compressed air is guaranteed to be less than or equal to 40 ℃ under the combined action of the three measures, the dew point of the compressed air is improved, and the quality of the gas of the compressed air externally supplied to users is guaranteed. Therefore, the electric quantity consumption is saved, the regeneration time of the suction dryer is shortened, the service life of the suction dryer is prolonged, the accuracy of the temperature of the unit is improved, manual adjustment is reduced, and manpower is greatly saved.
Through contrast verification, the effect of reducing the power consumption of the suction dryer is obvious. The power consumption of the suction dryer is analyzed, the maximum power consumption part is the power consumption of the electric heating rod when the filler is regenerated, and the power consumption of the suction dryer is greatly influenced by different dew point settings. The embodiment reduces the power consumption of the electric heating rod during regeneration by optimizing the dew point set value of the drying machine, so that the power consumption of the whole drying machine can be reduced. The power consumption of the dryer is counted three months before and three months after dew point adjustment, the daily power consumption of the dryer is reduced from 245849 ℃ to 20003 ℃ at present, the daily average power consumption is 4546 ℃, 13.6 ten thousand DEG of power can be saved in one month, the power consumption of the dryer is obviously reduced, and the effect is obvious.
The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments may be made in the present invention in addition to the above embodiments. It will be understood by those skilled in the art that various changes, substitutions of equivalents, and alterations can be made without departing from the spirit and scope of the invention.
Claims (3)
1. A regulation control method for improving dew point temperature of compressed air is characterized in that the compressed air is prepared by an air compression system consisting of a plurality of stages of compression devices connected in series, a cooler for cooling the compressed air is arranged between two adjacent stages of compression devices, and an exhaust port of the air compression system is connected with an air inlet of a suction dryer; the method comprises the following steps: detecting the ambient temperature of the air inlet of the suction dryer, adjusting the dew point temperature set value of the suction dryer according to the ambient temperature, automatically setting the dew point temperature of the suction dryer to-35 ℃ when the ambient temperature is lower than 15 ℃ for 24 continuous hours, and automatically setting the dew point temperature of the suction dryer to-30 ℃ when the ambient temperature is higher than or equal to 15 ℃ for 24 continuous hours.
2. The adjustment control method for improving the dew point temperature of compressed air according to claim 1, characterized in that: the exhaust temperature of the air compression system is adjusted to be less than 40 degrees by automatically controlling the cooler through the PLC.
3. The adjustment control method for improving the dew point temperature of compressed air according to claim 2, characterized in that: the cooler is a water-cooling cooler which is supplied with water circularly by a cooling tower; when the exhaust temperature of the air compression system is higher than 40 ℃, the PLC controls the start and stop of the fan of the cooling tower to enable the water temperature of the water outlet main pipe of the cooling tower to be lower than 25 ℃, and if the fan runs at full load, the exhaust temperature of the air compression system is still higher than 40 ℃, cooling water is supplemented from the outside to the cooling tower.
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