CN115518497A - Blast regeneration compressed air dryer and use method thereof - Google Patents
Blast regeneration compressed air dryer and use method thereof Download PDFInfo
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- CN115518497A CN115518497A CN202211352965.8A CN202211352965A CN115518497A CN 115518497 A CN115518497 A CN 115518497A CN 202211352965 A CN202211352965 A CN 202211352965A CN 115518497 A CN115518497 A CN 115518497A
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- 230000008929 regeneration Effects 0.000 title claims abstract description 56
- 238000011069 regeneration method Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001179 sorption measurement Methods 0.000 claims abstract description 297
- 239000003463 adsorbent Substances 0.000 claims abstract description 79
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000007664 blowing Methods 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 10
- 239000003570 air Substances 0.000 claims description 136
- 238000010438 heat treatment Methods 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 15
- 230000001172 regenerating effect Effects 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 239000012080 ambient air Substances 0.000 claims description 5
- 238000004062 sedimentation Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims 1
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 206010015856 Extrasystoles Diseases 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- FNYLWPVRPXGIIP-UHFFFAOYSA-N Triamterene Chemical compound NC1=NC2=NC(N)=NC(N)=C2N=C1C1=CC=CC=C1 FNYLWPVRPXGIIP-UHFFFAOYSA-N 0.000 description 1
- 238000007605 air drying Methods 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002808 molecular sieve Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 description 1
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/047—Pressure swing adsorption
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Abstract
The invention provides a blowing regeneration compressed air dryer and a using method thereof, wherein the blowing regeneration compressed air dryer comprises a first adsorption tower and a second adsorption tower which are switched to be used in at least two interval adsorption periods, and in any adsorption period, when any adsorption tower is in an adsorption state, the other adsorption tower is in a regeneration state, and the blowing regeneration compressed air dryer comprises the following steps: step one, compressed air with moisture enters a first adsorption tower in an adsorption state from an equipment inlet of a blast regeneration compressed air dryer for adsorption and drying, the compressed air dried by the adsorption tower is discharged from an equipment outlet of the blast regeneration compressed air dryer, and a detection instrument arranged at the equipment inlet acquires the single-tower adsorption water amount in the period of the current adsorption period; step two, obtaining the initial theoretical adsorption capacity of the single tower in the current adsorption period; and step three, comparing the single-tower adsorbed water amount in the period with the initial single-tower theoretical adsorption amount to obtain an adsorbent performance attenuation value.
Description
Technical Field
The invention relates to the field of air compressor equipment, in particular to a blowing regeneration compressed air dryer and a using method thereof.
Background
The compressed air dryers are generally classified into a freezing type compressed air dryer and an adsorption type compressed air dryer, the freezing type compressed air dryer separates moisture in humid air from the air by condensation by using the principle of reducing the air temperature, and obtains relatively dry air, while the adsorption type compressed air dryer obtains the dry air by using the principle of pressure swing adsorption, and when the humid air passes through an adsorbent, the moisture is adsorbed by the adsorbent.
However, after the current adsorption type compressed air dryer performs adsorption drying on compressed air for a certain time, the adsorbent in the current adsorption type compressed air dryer can be saturated in adsorption, so that the adsorbent needs to be regenerated, and the existing adsorption type compressed air dryer cannot continuously perform adsorption drying on the compressed air when the adsorbent is regenerated, so that the efficiency of adsorption drying of the compressed air is greatly reduced.
Meanwhile, the existing adsorption type compressed air dryer cannot judge the degree of attenuation of the adsorption performance of the adsorbent in the dryer, so that a user cannot simply maintain the adsorbent when the adsorbent is attenuated to a large degree.
With conventional designs, the user would only consider replacing the adsorbent at a fixed period (e.g., 3-5 years) or when the equipment outlet air dryness exceeds the standard.
If the adsorbent is replaced according to a fixed period, the performance of the adsorbent is not greatly attenuated, so that materials and working hours are wasted to a great extent; since the quality of outlet air is affected by various conditions such as air inlet condition, valve tightness, heating efficiency, blower air volume and the like, the judgment according to the quality of outlet air is easy to cause unnecessary adsorbent replacement due to misdiagnosis.
Disclosure of Invention
The invention aims to provide a blast regeneration compressed air dryer and a using method, wherein the blast regeneration compressed air dryer can continuously adsorb and dry compressed air when an adsorbent is regenerated and can judge the degree of the adsorption performance attenuation of the adsorbent.
In order to solve the technical problem, the invention provides a method for using a blowing regeneration compressed air dryer, wherein the blowing regeneration compressed air dryer comprises a first adsorption tower and a second adsorption tower which are used by switching at least two interval adsorption periods, and in any adsorption period, when any adsorption tower is in an adsorption state, the other adsorption tower is in a regeneration state, the method comprises the following steps:
step one, compressed air with moisture enters a first adsorption tower in an adsorption state from an equipment inlet of a blast regeneration compressed air dryer for adsorption and drying, the compressed air dried by the adsorption tower is discharged from an equipment outlet of the blast regeneration compressed air dryer, and a detection instrument arranged at the equipment inlet acquires the single-tower adsorption water amount in the period of the current adsorption period;
step two, obtaining the initial theoretical adsorption capacity of a single tower in the current adsorption period;
and step three, comparing the single-tower adsorption water quantity in the period with the initial single-tower theoretical adsorption quantity to obtain an adsorbent performance attenuation value.
Further, a detection instrument of the equipment inlet comprises a flow integrating instrument used for obtaining total air inflow in the current period and a pressure transmitter used for obtaining air inflow pressure, the moisture content of compressed air is calculated by utilizing the air inflow pressure and the water vapor partial pressure, and the product of the moisture content and the total air inflow is obtained to obtain the single-tower water absorption amount in the period.
Further, when the initial single-tower theoretical adsorption amount in the current adsorption period is obtained in the step two, the dynamic adsorption amount of the adsorbent is obtained according to the inlet air temperature of the adsorption tower, and the product of the dynamic adsorption amount of the adsorbent and the weight of the single-tower adsorbent is calculated to obtain the initial single-tower theoretical adsorption amount in the current adsorption period.
Further, when the performance attenuation value of the adsorbent is obtained in the third step, calculating the difference value between the single-tower adsorbed water amount and the initial single-tower theoretical adsorbed amount in the period to obtain the performance attenuation value of the adsorbent.
Furthermore, a heater controlled in a grouping mode is connected to the side of the adsorption tower, and when the adsorption tower is in a regeneration state, the heater is adjusted according to the current environment humidity to output corresponding heat in a matching mode.
Furthermore, each adsorption tower is provided with a material level switch, the material level switch monitors the sedimentation state of the adsorbent in the current adsorption tower, and if the height of the adsorbent is reduced, the material level switch is started to prompt.
Further, a blower, a heater and a cooler are connected between the first adsorption tower and the second adsorption tower, when the first adsorption tower or the second adsorption tower is heated and regenerated, the blower, the heater, the first adsorption tower or the second adsorption tower are communicated with each other, so that ambient air enters the first adsorption tower or the second adsorption tower after being heated by the heater, and when the first adsorption tower or the second adsorption tower is subjected to cold blowing, the blower, the cooler, the first adsorption tower or the second adsorption tower are communicated with each other, so that gas in the first adsorption tower or the second adsorption tower is circulated and cooled by the cooler.
Furthermore, when the blower stops being used and the first adsorption tower or the second adsorption tower carries out heating regeneration, the valve is switched, so that the compressed air which is partially dried at the outlet of the equipment is heated by the heater and enters the first adsorption tower or the second adsorption tower for temperature rise.
The invention also discloses a blast regeneration compressed air dryer which comprises a first adsorption tower and a second adsorption tower, wherein a blower, a heater and a cooler are connected between the first adsorption tower and the second adsorption tower, the blower, the heater, the first adsorption tower or the second adsorption tower form a heating regeneration flow path, the blower, the cooler, the first adsorption tower or the second adsorption tower form a cold blowing flow path, an equipment outlet, the heater, the first adsorption tower or the second adsorption tower form an internal heating flow path, and the operation is carried out according to the use method of the blast regeneration compressed air dryer.
Furthermore, a plurality of sub-heating groups are arranged in the heater.
The invention has the beneficial effects that:
1. through the mutual switching between the first adsorption tower and the second adsorption tower, when the first adsorption tower needs to regenerate the adsorbent in the first adsorption tower, the second adsorption tower can be normally used for carrying out adsorption drying on the compressed air, and when the second adsorption tower carries out adsorbent regeneration, the first adsorption tower can also be used for carrying out adsorption drying, so that the continuity in the compressed air drying process is increased, and the working efficiency is further increased;
2. through detecting the single-tower adsorbed water volume in the cycle that obtains to single-tower adsorbed water volume and initial single-tower theoretical adsorption capacity in the cycle are compared, and then judge the adsorption performance decay degree of first adsorption tower or second adsorption tower, but make the decay degree of user real-time supervision adsorbent, so that prevent in advance.
Drawings
FIG. 1 is a schematic of the present invention.
FIG. 2 is a schematic view of the pneumatic programmable valves of the present invention.
FIG. 3 is a schematic view of the adsorption isobar of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships that are based on those shown in the drawings, which are merely for convenience in describing the present disclosure and to simplify the description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus the terms above should not be construed as limiting the present disclosure.
It is understood that the terms "a" and "an" should be interpreted as meaning "at least one" or "one or more," i.e., that a quantity of one element may be one in one embodiment, while a quantity of another element may be plural in other embodiments, and the terms "a" and "an" should not be interpreted as limiting the quantity.
As shown in fig. 1 to 3, the present invention provides a method for using a forced air regeneration compressed air dryer, which comprises a first adsorption tower 1 and a second adsorption tower 2 used by switching at least two adsorption periods, wherein in any adsorption period, when any adsorption tower is in an adsorption state, the other adsorption tower is in a regeneration state, comprising the following steps:
step one, compressed air with moisture enters a first adsorption tower 1 in an adsorption state from an equipment inlet of a blast regeneration compressed air dryer for adsorption drying, the compressed air dried by the adsorption tower is discharged from an equipment outlet of the blast regeneration compressed air dryer, a detection instrument arranged at the equipment inlet acquires the single-tower adsorption water amount in the period of the current adsorption period, wherein the first adsorption tower and a second adsorption tower are filled with active alumina or molecular sieves and the like;
wherein, a detection instrument arranged at an equipment inlet acquires the single-tower water adsorption amount in the period of the current adsorption period, the value acquired in the actual use process is the intake water content, and the actual water adsorption amount = (intake water content-outlet water content) multiplied by the air mass flow; because the outlet of the device is dry air, the water content is extremely low, and the numerical values of the water absorption amount of the single tower in the period and the water inflow amount in the absorption period are very close.
Taking a conventional design working condition as an example, the water content of inlet air of the equipment is 5.2g/kg dry air, the water content of outlet air is about 0.002 to 0.01g/kg dry air, the water absorption amount accounts for 99.8 to 99.96 percent of the water content of the inlet air, the deviation of each relevant calculation result caused by the difference value of the two is between 0.04 to 0.2 percent, and the judgment of the attenuation value of the adsorbent cannot cause substantial influence.
Step two, obtaining the initial theoretical adsorption capacity of the single tower in the current adsorption period;
and step three, comparing the single-tower adsorption water quantity in the period with the initial single-tower theoretical adsorption quantity to obtain an adsorbent performance attenuation value.
It should be mentioned that, in the process of switching between the first adsorption tower 1 and the second adsorption tower 2, after a set period, the second adsorption tower 2 replaces the first adsorption tower 1 to adsorb and dry the compressed air with moisture, and at the same time, the first adsorption tower 1 is subjected to pressure relief, heating regeneration, cold blowing and pressurization in sequence; then, switching between the first adsorption tower 1 and the second adsorption tower 2 at set intervals, and performing pressure relief, heating regeneration, cold blowing and pressurization on the other adsorption tower so as to ensure that the other adsorption tower can still maintain the adsorption effect on the compressed air when one adsorption tower performs adsorbent regeneration;
wherein, the equipment exit of the compressed air dryer that provides at this scheme is provided with dew point detection instrument, and this scheme adopts two kinds of switching cycles usually when switching the use to first adsorption tower and second adsorption tower, and first switching cycle is: when the dew point of the compressed air at the outlet of the equipment is detected by a dew point detection instrument, and the moisture carried by the compressed air is higher and exceeds a set value, the current adsorption quantity can be judged to reach the upper limit, and the first adsorption tower and the second adsorption tower are switched at the moment; and the second switching cycle employs: the cycle time is set, that is, the switching time is set, and when the switching time is reached, the first adsorption tower and the second adsorption tower can be directly switched.
As shown in fig. 1, a blower 3, a heater 4 and a cooler 5 are connected between the first adsorption tower 1 and the second adsorption tower 2, when the first adsorption tower 1 or the second adsorption tower 2 performs heating regeneration, the blower 3, the heater 4, the first adsorption tower 1 or the second adsorption tower 2 are communicated with each other, so that ambient air is heated by the heater 4 and then enters the first adsorption tower 1 or the second adsorption tower 2, and when the first adsorption tower 1 or the second adsorption tower 2 performs cold blowing, the blower 3, the cooler 5, the first adsorption tower 1 or the second adsorption tower 2 are communicated with each other, so that gas in the first adsorption tower 1 or the second adsorption tower 2 circulates through the cooler 5 to be cooled.
Wherein, first adsorption tower, the second adsorption tower, the air-blower, all communicate through supporting pipeline between heater and the cooler, and control the flow path of supporting pipeline through pneumatic program control valve, and pneumatic program control valve adopts control system to control and opens and close, this control system can adopt MODBUS, profibus, TCP/TP, multiple communication protocol realization such as profinet and host computer or remote control system's both-way communication, and then guarantee the stability and the accuracy of flow path switching in-process, and then make the control room can monitor equipment running state and parameter, and guarantee that equipment can carry out long-range opening and closing operation.
And the pneumatic program control valve of this scheme is equipped with pneumatic trigeminy piece, double coil solenoid valve and travel switch, and pneumatic trigeminy piece wherein is used for keeping the action of this pneumatic program control valve sensitive, reliable, and the double coil solenoid valve is used for guaranteeing this pneumatic program control valve under the outage state and keeps the normal position, avoids the malfunction to cause the system to lose pressure, and travel switch is then used for feeding back this pneumatic program control valve's valve signal to be convenient for carry out shutdown protection when the valve position trouble.
Specifically, when the compressed air dryer provided by the scheme is actually used, the adsorbent can adsorb moisture in the compressed air under the conditions of normal temperature and high pressure and analyze the moisture under the conditions of high temperature and normal pressure according to the pressure-swing temperature-swing adsorption principle and the characteristics of the adsorbent.
In the working cycle process, the first adsorption tower is taken as an example, compressed air firstly enters the first adsorption tower, moisture carried by the compressed air is adsorbed by the adsorbent in the first adsorption tower, and dried compressed air is discharged from an outlet of the equipment. After the adsorbent in the first adsorption tower is adsorbed and saturated, the adsorbent does not have adsorption capacity any more, and pressure reduction and heating regeneration are needed to ensure that the adsorbent has adsorption capacity again, so that the adsorbent regeneration needs the following two steps:
pressure relief: and discharging the compressed air in the adsorption tower to reduce the working pressure in the tower to the normal pressure.
Heating and regenerating: the power is provided by the blower, the ambient air is introduced into the heater to be heated and then enters the adsorption tower to heat the adsorbent in the tower, so that the adsorbent is heated and dehydrated.
After regeneration is completed, in order to make the adsorbent enter the adsorption state again, the normal-temperature and high-pressure state needs to be reestablished in the tower, so that the method is mainly realized by the following two steps:
cold blowing: through valve switching, a closed circulating system is formed by the adsorption tower, the air blower, the cooler and the like, the air blower is used as a circulating driving force to continuously take heat of the adsorbent out to exchange heat with the cooler, and therefore the purpose of cold blowing is achieved.
Pressurizing: and closing the emptying valve, and taking part of compressed air from the equipment outlet to gradually increase the pressure in the tower to a working state.
To make the switching cycle of the blast regeneration compressed air dryer clearer, the following table 1 is given as an example:
TABLE 1
As shown in fig. 2, after the pneumatic programmable valve is labeled, the following steps are performed:
1. an adsorption stage: (taking the first adsorption column as an example)
Highly humid compressed air → plant inlet → pneumatic butterfly valve 804 → first adsorption tower → check valve 816 → plant outlet.
2. Pressure relief stage (second adsorption tower regeneration for example)
Compressed air in the second adsorption tower → T-shaped valve 815 → muffler 6 → atmospheric air
3. Heating regeneration stage (taking regeneration of the second adsorption column as an example)
An external heating mode: the ambient air (through the air intake screen) → the pneumatic butterfly valve 806 → the roots blower 3 → the pneumatic butterfly valve 808 → the heater 4 → the pneumatic butterfly valve 811 → the second adsorption tower → the pneumatic butterfly valve 803 → the pneumatic butterfly valve 820 → the atmosphere.
4. Cooling regeneration stage (taking second adsorption tower regeneration as an example)
An external heating mode: high-temperature air in the second adsorption tower → the pneumatic butterfly valve 811 → the cooler 5 → the pneumatic butterfly valve 807 → the roots blower 3 → the pneumatic butterfly valve 801 → the pneumatic butterfly valve 803 → the inside of the second adsorption tower.
5. Pressurizing stage (second adsorption tower regeneration is taken as an example)
Part of the apparatus outlet clean air → the T-shaped valve 813 → the inside of the second adsorption tower.
Preferably, the detecting instrument at the device inlet comprises a flow integrating instrument for acquiring total air inflow in the current period and a pressure transmitter for acquiring intake pressure, the moisture content of the compressed air is calculated by using the intake pressure and the water vapor partial pressure, and the product of the moisture content and the total air inflow is obtained to acquire the single-tower water absorption amount in the period.
Therefore, the calculation process of the amount of water adsorbed by the single tower in the period is m H2O And = m × W, wherein m is the total air intake amount in the adsorption period, and W is the moisture content.
The moisture content W was calculated as W =0.621945 × p w /(p-p w ) So that m is H2O =0.621945×m×p w /(p-p w ) Where p is the pressure of the equipment inlet compressed air, p w Is the partial pressure of water vapor.
Partial pressure p of water vapor w Is calculated as lgP w = 7.07406-1657.46/(T + 227.02), where T is the inlet compressed air temperature.
It is worth mentioning that the detecting instrument that this scheme equipment entrance set up includes apparatuses such as thermal mass flowmeter, flow integrating instrument, pressure transmitter, integration thermal resistance, and can know by above-mentioned computational formula:
the amount of water m adsorbed by a single tower in the period H2O =m×W=0.621945×m×p w /(p-p w )；
Wherein, m is total air input in the adsorption cycle, is read by the flow totalizer, and the unit: the weight of the mixture is kg,
w is moisture content, unit: kg/kg, since the dryer inlet is saturated with compressed air, W, the saturated moisture content of the compressed air, can be calculated by the following formula: w =0.621945 × p w /(p-p w )；
0.621945 in the formula is a ratio of the relative molecular mass of water to the relative molecular mass of 18.015268 to the relative molecular mass of air to the molecular mass of 28.966; p is the inlet compressed air pressure, which is read by the pressure transmitter at the inlet of the device in units: kPa; and p is w Is the water vapor partial pressure, unit: kPa. Because the air inlet of the device is saturated compressed air containing water p w The value can be given by the Antoni equation lgp w = 7.07406-1657.46/(T + 227.02), where T is the inlet compressed air temperature, which is read by the integrated thermal resistance at the inlet of the device, in units: K.
preferably, when the initial theoretical single-tower adsorption amount in the current adsorption period is obtained in the second step, the dynamic adsorption amount of the adsorbent is obtained according to the inlet air temperature of the adsorption tower, and the product of the dynamic adsorption amount of the adsorbent and the weight of the single-tower adsorbent is calculated to obtain the initial theoretical single-tower adsorption amount in the current adsorption period.
Particularly, initial measurement or factory measurement is required to be performed when the adsorbent is in an initial state, after dynamic adsorption amounts of the adsorbent under different pressures and temperatures are tested, a curve fitting method is performed by matching with experimental data, so that the dynamic adsorption amounts of the adsorbent under different working conditions are obtained, and since the initial single-tower theoretical adsorption amount of the adsorbent is a product of the dynamic adsorption amount and the weight of the single-tower adsorbent, for example, when the dynamic adsorption amount is measured for 1kg of adsorbent, the initial single-tower theoretical adsorption amount of 100 × dynamic adsorption amount can be obtained by setting the weight of the adsorbent in a single tower to 100g, and therefore, on the basis of knowing the initial single-tower theoretical adsorption amount and the single-tower adsorption water amount in a period, comparison and judgment can be performed on the initial single-tower theoretical adsorption amount and the single-tower adsorption water amount.
In the actual judgment process, the relation equation of the theoretical dynamic adsorption capacity and the temperature of the adsorbent under different working conditions can be obtained through a curve fitting method, wherein S = aT 2 + bT + C, where S is the theoretical dynamic adsorption capacity of the adsorbent and T is the corresponding temperature.
Specifically, in the process of obtaining the relational equation, the following steps may be performed:
1) The initial theoretical adsorption capacity of the single tower at different temperatures of the sample adsorbent (within the working interval of the compressed air dryer in the scheme) is respectively tested, such as the adsorption capacity at six states of 20 ℃,25 ℃,30 ℃,35 ℃,40 ℃ and 45 ℃.
2) Adsorption isobars are drawn according to the adsorption amount at each temperature, as shown in fig. 3.
3) And fitting a curve equation according to the adsorption isobars.
It should be noted that, since the processes, categories, and specifications of different manufacturers are different, the coefficients a, b, and c in the relational equation are different and need to be obtained by reference to actual measurement and substituted into a formula.
Meanwhile, the initial theoretical adsorption capacity of the single tower and the amount of water adsorbed by the single tower in the period have period limitations, namely the initial theoretical adsorption capacity of the single tower in the period and the amount of water adsorbed by the single tower in the period, wherein the period refers to a switching period of the first adsorption tower and the second adsorption tower.
Preferably, when the performance attenuation value of the adsorbent is obtained in the third step, the difference between the amount of water adsorbed by the single tower in the period and the initial theoretical amount of adsorbed by the single tower is calculated to obtain the performance attenuation value of the adsorbent.
Under the effect of frequent thermal regeneration alternation, partial inner holes can collapse and melt to lose the function of absorbing moisture, and along with the increase of absorption and desorption times, the pore channels in the adsorbent can be reduced in sequence, so that the saturated adsorption capacity can be attenuated.
According to the above judgment mode, in the switching period, the initial single-tower theoretical adsorption amount is compared with the single-tower adsorption water amount in the period, for example, in the switching period and at a certain temperature, the initial single-tower theoretical adsorption amount is 100g, the single-tower adsorption water amount in the period obtained by calculation in the equipment operation process is 80g, and the performance attenuation of the adsorbent is 20%; and then, the performance attenuation value of the adsorbent can be transmitted to a display window visible for a user through display equipment, model signal transmission equipment and the like, or the user can be prompted directly in an alarm mode.
It should be noted that, in order to ensure the accuracy of the detection of the decay value of the performance of the adsorbent in the present embodiment, a dew point detection instrument is used to detect the dew point at the outlet of the device in the switching period between the first adsorption tower 1 and the second adsorption tower 2, and then the switching manner between the first adsorption tower 1 and the second adsorption tower 2 is determined.
Preferably, when the blower 3 is not in use and the first adsorption tower 1 or the second adsorption tower 2 is in heating regeneration, the valve is switched so that the partially dried compressed air at the outlet of the apparatus is heated by the heater 4 and then enters the first adsorption tower 1 or the second adsorption tower 2 to be heated.
As shown in fig. 2, when the blower is stopped due to a failure or the like, an internal heating mode is adopted, for example:
in the heating regeneration phase, the internal heating mode: part of the equipment outlet clean air → the flow regulating valve 818 → the T-shaped valve 819 → the heater 4 → the pneumatic butterfly valve 811 → the tower 2 → the pneumatic butterfly valve 803 → the pneumatic butterfly valve 820 → the atmosphere.
Internal heating mode in cooling phase: part of the equipment outlet clean air → the flow rate adjusting valve 818 → the T-shaped valve 819 → the heater 4 (heating stopped state) → the pneumatic butterfly valve 811 → the tower 2 → the pneumatic butterfly valve 803 → the pneumatic butterfly valve 820 → the atmosphere.
The invention also discloses a blowing regeneration compressed air dryer, which comprises a first adsorption tower 1 and a second adsorption tower 2, wherein a blower 3, a heater 4 and a cooler 5 are connected between the first adsorption tower 1 and the second adsorption tower 2, the blower 3, the heater 4, the first adsorption tower 1 or the second adsorption tower 2 form a heating regeneration flow path, the blower 3, the cooler 5, the first adsorption tower 1 or the second adsorption tower 2 form a cold blowing flow path, an equipment outlet, the heater 4, the first adsorption tower 1 or the second adsorption tower 2 form an internal heating flow path, and the operation is carried out according to the using method of the blowing regeneration compressed air dryer.
Wherein, the cooling water inlet department in the cooler is provided with electrical control valve, opens and close and opens the size through electrical control valve and control the flow, stop and the flow size of cooling water to adapt to different cooling demands.
Preferably, a heater 4 controlled in groups is connected to the side of the adsorption tower, a plurality of sub-heating groups are arranged in the heater 4, and when the adsorption tower is in a regeneration state, the heater 4 is adjusted to output corresponding heat in a matching manner according to the current environmental humidity.
Specifically, through a plurality of heating sub-groups in the heater, the cooperation sets up the ambient humidity detecting instrument in the equipment outside for a plurality of heating sub-groups in the heater can heat the adjustment that starts quantity according to ambient humidity, for example when ambient humidity is higher, open the more heating sub-group of quantity simultaneously and adapt to, make the temperature can control in reasonable within range, when avoiding ambient humidity to rise, because regeneration temperature crosses lowly causes the problem that the adsorbent can not be regenerated completely.
Preferably, each adsorption tower is provided with a material level switch, the material level switch monitors the sedimentation state of the adsorbent in the current adsorption tower, and if the height of the adsorbent is reduced, the material level switch is started to prompt.
In particular, during the operation of the equipment, the adsorbent is subjected to frequent impacts of pressure, water vapor and heat for most of the time and is easily broken mechanically. On the other hand, when the drying tower is frequently switched, the pressure drop is too rapid, so that the adsorbents are greatly displaced in the tower and rub against each other to be pulverized. At this time, if the adsorbent is not timely replenished, an obvious space will appear at the upper part of the adsorption tower. When compressed air enters the lower part of the adsorption tower, the adsorbent can rapidly displace in a short time under the impact force of airflow, so that the adsorbents collide and rub with each other and collide with the wall of the adsorption tower, and further pulverization and failure of the adsorbent are easily caused.
Meanwhile, pressure gauges are arranged on the first adsorption tower and the second adsorption tower so as to ensure that pressure in the first adsorption tower and the second adsorption tower can be clearly observed by a user.
The material level switch of this scheme adopts and hinders material level switch soon for when the material level in the adsorption tower was unchangeable, hinder material level switch and maintain normal condition soon, when the adsorbent material descends, hinder material level switch signals soon.
In the preferred embodiment of the scheme, the adsorbent is allowed to slightly settle until the adsorbent settles to the set position, and a prompt signal is sent.
The present invention is not limited to the above preferred embodiments, and any other various products can be obtained by anyone in light of the present invention, but any changes in shape or structure thereof, which are similar or identical to the technical solution of the present invention, fall within the protection scope of the present invention.
Claims (10)
1. A method for using a forced air regeneration compressed air dryer, which comprises a first adsorption tower (1) and a second adsorption tower (2) switched to be used by at least two interval adsorption periods, wherein in any adsorption period, when any adsorption tower is in an adsorption state, the other adsorption tower is in a regeneration state, the method is characterized by comprising the following steps:
step one, compressed air with moisture enters a first adsorption tower (1) in an adsorption state from an equipment inlet of a blast regeneration compressed air dryer for adsorption and drying, the compressed air dried by the adsorption tower is discharged from an equipment outlet of the blast regeneration compressed air dryer, and a detection instrument arranged at the equipment inlet acquires the single-tower adsorption water amount in the period of the current adsorption period;
step two, obtaining the initial theoretical adsorption capacity of the single tower in the current adsorption period;
and step three, comparing the single-tower adsorbed water amount in the period with the initial single-tower theoretical adsorption amount to obtain an adsorbent performance attenuation value.
2. The method of using a forced air regenerative compressed air dryer of claim 1, wherein: the detection instrument at the inlet of the device comprises a flow totalizer for acquiring total air inflow in the current period and a pressure transmitter for acquiring air inflow pressure, wherein the moisture content of compressed air is calculated by utilizing the air inflow pressure and the water vapor partial pressure, and the product of the moisture content and the total air inflow is obtained to acquire the single-tower water absorption amount in the period.
3. The method of using a forced air regenerative compressed air dryer of claim 1, wherein: and step two, when the initial single-tower theoretical adsorption amount in the current adsorption period is obtained, the dynamic adsorption amount of the adsorbent is obtained according to the inlet air temperature of the adsorption tower, and the product of the dynamic adsorption amount of the adsorbent and the weight of the single-tower adsorbent is calculated to obtain the initial single-tower theoretical adsorption amount in the current adsorption period.
4. The method of using a forced air regenerative compressed air dryer of claim 1, wherein: and when the performance attenuation value of the adsorbent is obtained in the third step, calculating the difference value between the single-tower adsorbed water amount and the initial single-tower theoretical adsorbed amount in the period to obtain the performance attenuation value of the adsorbent.
5. The method of using a forced air regenerative compressed air dryer of claim 1, wherein: the side of the adsorption tower is connected with a heater (4) controlled in a grouping way, and when the adsorption tower is in a regeneration state, the heater (4) is adjusted according to the current environment humidity to match and output corresponding heat.
6. The method of using a forced air regenerative compressed air dryer of claim 1, wherein: and a material level switch is arranged on each adsorption tower and used for monitoring the sedimentation state of the adsorbent in the current adsorption tower, and if the height of the adsorbent is reduced, the material level switch is started to prompt.
7. The method of using a forced air regenerative compressed air dryer of claim 1, wherein: the air blower (3), the heater (4), the first adsorption tower (1) or the second adsorption tower (2) are communicated with each other when the first adsorption tower (1) or the second adsorption tower (2) is heated and regenerated, so that ambient air is heated by the heater (4) and then enters the first adsorption tower (1) or the second adsorption tower (2), and when the first adsorption tower (1) or the second adsorption tower (2) is subjected to cold blowing, the air blower (3), the cooler (5), the first adsorption tower (1) or the second adsorption tower (2) are communicated with each other so that gas in the first adsorption tower (1) or the second adsorption tower (2) circulates through the cooler (5) to be cooled.
8. The method of using a forced air regenerative compressed air dryer of claim 7, wherein: when the blower (3) is stopped to be used and the first adsorption tower (1) or the second adsorption tower (2) is heated and regenerated, the valve is switched, so that the compressed air which is partially dried at the outlet of the equipment is heated by the heater (4) and then enters the first adsorption tower (1) or the second adsorption tower (2) to be heated.
9. The utility model provides a blast regeneration compressed air desicator which characterized in that: the compressed air drier comprises a first adsorption tower (1) and a second adsorption tower (2), wherein a blower (3), a heater (4) and a cooler (5) are connected between the first adsorption tower (1) and the second adsorption tower (2), the blower (3), the heater (4), the first adsorption tower (1) or the second adsorption tower (2) form a heating regeneration flow path, the blower (3), the cooler (5), the first adsorption tower (1) or the second adsorption tower (2) form a cold blowing flow path, an equipment outlet, the heater (4), the first adsorption tower (1) or the second adsorption tower (2) form an internal heating flow path, and the use method of the compressed air drier for air blowing regeneration according to any one of claims 1-8 is operated.
10. The forced air regenerative compressed air dryer of claim 9, wherein: a plurality of sub-heating groups are arranged in the heater (4).
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Application publication date: 20221227 |