Method for controlling the first reference temperature of a gas compression device

Abstract

A method for controlling a first reference temperature in an apparatus (1) for compressing a gas, the apparatus (1) comprising: an oil-injected element (2) for compressing the gas; and an oil injection pipe network (6) for injecting oil into the oil-injected element (2); the oil injection pipe network (6) comprising distribution means (8) for distributing oil to a first part and a second part; an oil cooler (10) cooled by a fan (9) for cooling the first part; and a bypass (11) for bypassing the second part over the oil cooler (10); wherein first a distribution rate of the first part is controlled to a required distribution rate, and then a speed of the fan (9) is controlled to a required speed, optionally based on the distribution rate, the distribution rate being controlled by a control unit (15) based on a non-fuzzy logic algorithm.

Description

[Technical Field]

[0001] The present invention relates to a method for controlling the first reference temperature of a gas compression device to a desired temperature value.

[0002] In this specification, “apparatus for compressing gases” may refer to both a compressor device for compressing atmospheric gases to superatmospheric pressure and a vacuum pump device for vacuum suction of a user network or enclosed space.

[0003] More specifically, the present invention relates to a method for controlling the first reference temperature of an apparatus to a first desired temperature value, wherein the apparatus comprises the following components, namely: - An oil-injected element for compressing gas, - An oil injection pipe network having an outlet for injecting oil into an oil-injectable element, The oil injection pipe network is equipped with, - A distribution means for distributing oil into a first part and a second part, - An oil cooler cooled by a fan to cool the first part, -The second section is a bypass that goes past the oil cooler, The device is equipped with the following: first, the distribution ratio of the first part is controlled to a required distribution ratio in order to bring the second reference temperature of the device to a second desired temperature value; and subsequently, the speed of the fan is controlled to a required speed in order to bring the first reference temperature to a first desired temperature value.

[0004] In this specification, “reference temperature of the device” means the temperature at a specific reference location of the device, for example, the temperature at the outlet of an oil-injected element where the gas temperature of the device is typically highest, or the temperature at the outlet of an oil injection pipe network where the oil temperature is important for the cooling and lubrication of the device.

[0005] In this specification, “distribution ratio of the first part” means the ratio of the flow rate or amount of the first part to the total flow rate or total amount of oil. Therefore, this distribution ratio can be in the range of 0 to 100%. [Background technology]

[0006] The need and methods for controlling a specific reference temperature of a gas compressor to a desired temperature value are already known.

[0007] On the one hand, to avoid the formation of condensate from gases, for example, it is necessary to ensure that the reference temperature does not fall below a minimum level. Condensate negatively affects the cooling or lubricating capacity of the oil in the device, and further causes corrosion of the device's components, resulting in a shortened lifespan. On the other hand, to avoid damage to the device due to, for example, deterioration of the quality of the oil in the device or deformation of the device's components, it is also conceivable to ensure that the reference temperature does not rise above a maximum level.

[0008] An oil-injected element for compressing gas and an oil injection pipe network for injecting oil into this oil-injected element. of In some existing devices, the reference temperature is controlled to a desired temperature using a thermostat control valve with a fixed temperature setpoint and a fixed-speed fan to cool the oil in the oil injection pipe network, and the fan stops when the reference temperature falls below the maximum level.

[0009] Tests have shown that using a thermostat-controlled valve with a fixed temperature setting and a fan with a fixed speed does not necessarily result in high energy efficiency for the device. Even when the reference temperature does not significantly exceed the maximum level, the fan always starts at a fixed speed, causing the reference temperature to drop rapidly and requiring the fan to stop quickly. In the worst case, the reference temperature drops significantly below the minimum level, increasing the risk of condensation forming in the device.

[0010] Other existing devices use a thermostat control valve and a variable speed fan controlled by a PID controller. Such systems typically have separate control circuits for controlling the thermostat control valve and the fan.

[0011] Tests have shown that this type of device can exhibit irregular and oscillatory behavior due to interference between the separate control circuits. Adverse effects include the possibility of an emergency stop of the device, damage to the mechanical components of the device, and premature wear of various components of the device.

[0012] WO 2018 / 033827 describes a method for controlling the outlet temperature of a device having an oil injection element for compressing gas and an oil injection pipe network for injecting oil into the oil injection element, wherein the position of the thermostat control valve is controlled by applying a fuzzy logic algorithm to the measured value of the outlet temperature, and the speed of the fan for cooling the oil is controlled based on applying the fuzzy logic algorithm and further based on the position of the thermostat control valve.

[0013] The drawback of using a fuzzy logic algorithm is that it is a complex "multiple input - multiple output" (MIMO) computational algorithm.

Prior Art Documents

Patent Documents

[0014]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0015] The present invention aims to solve at least one of the above and / or other drawbacks.

[0016] More specifically, the object of the present invention is to provide a simple method for controlling the reference temperature of a device for compressing gas to a desired temperature value, on the one hand using as many separate subcircuits as possible, each having the simplest possible calculation algorithm, and on the other hand minimizing interference between separate control circuits within the device. [Means for solving the problem]

[0017] For this purpose, the present invention relates to a method for controlling the first reference temperature of a gas compressor to a desired temperature value, wherein the apparatus comprises the following components, namely - An oil-injected element for drawing gas at the inlet of the device and compressing the gas to the operating pressure at the outlet of the oil-injected element, - An oil injection pipe network having an outlet for injecting oil into an oil-injectable element, The oil injection pipe network is equipped with, - A distribution means for distributing oil into a first part and a second part, - An oil cooler cooled by a fan to cool the first part, -The second section is a bypass to go around the oil cooler, Equipped with, First, -In order to bring the second reference temperature of the apparatus to a second desired temperature value, the required distribution ratio of the first part is determined, - The distribution ratio of the first portion is controlled to the required distribution ratio. after that -The required speed of the fan is determined to bring the first reference temperature to a first desired temperature value, and if the first reference temperature is the same as the second reference temperature, the required speed is determined based on the second desired temperature value and distribution ratio. - The fan speed is controlled to the required speed. The distribution ratio is determined using the control unit. - Second reference temperature of First the current Value, and - Second desired temperature value, It is controlled based on a non-fuzzy logic algorithm, using the input as the input.

[0018] The advantage of this approach is that the distribution ratio is controlled by standard control devices, such as PID controllers or ON / OFF controllers. As a result, the use of complex "multi-input, multi-output" computation algorithms, such as those described in International Publication No. 2018 / 033827, is avoided.

[0019] Nevertheless, the apparatus according to the present invention has the same basic advantages as those described in International Publication No. 2018 / 033827.

[0020] More specifically, when the first reference temperature is the same as the second reference temperature, the method according to the present invention also avoids any interference between the control of the distribution ratio and the control of the fan speed. This is in stark contrast to the risk of this type of interference, which is strictly warned against in the case of devices using an SISO control unit for the control of the distribution ratio and the control of a variable-speed fan, on page 2, lines 18-27 of International Publication No. 2018 / 033827.

[0021] In a preferred embodiment of the method according to the present invention, the second desired temperature value is determined based on the maximum temperature value within a group of one or more temperature values.

[0022] As a result, a second desired temperature value can be determined based on a number of desired objectives.

[0023] Furthermore, the second desired temperature value can be adjusted to the most relevant purpose, depending on the operating range of the device.

[0024] In a more preferred embodiment of the method according to the present invention, the first temperature value in the group is such that the temperature of the compressed gas at the outlet is - The first condensation temperature of the compressed gas at the outlet, or - The temperature obtained by adding the first safety margin to the first condensation temperature. This represents a second reference temperature value that is equal to [value].

[0025] In this way, once a second desired temperature value is determined, the first objective is considered in terms of avoiding the formation of condensate within the apparatus.

[0026] Preferably, the first temperature value is limited in this respect according to a first temperature interval between a first minimum temperature limit and a first maximum temperature limit.

[0027] this is, -If the first temperature value is lower than the first minimum temperature limit, the first temperature value is set to be the same as the first minimum temperature limit. -If the first temperature value is higher than the first maximum temperature limit, the first temperature value is set to be the same as the first maximum temperature limit. - If the first temperature value is within the first temperature interval between the first minimum temperature limit and the first maximum temperature limit, the first temperature value is not changed. It means that.

[0028] By limiting the first temperature value to a first temperature interval, safety constraints can be considered, for example, with respect to the minimum and maximum operating temperatures of the device.

[0029] In a more preferred embodiment of the method according to the present invention, the second temperature value within the group represents the second reference temperature value at which the specific energy requirements of the apparatus are minimized.

[0030] In this way, once a second desired temperature value is determined, the second objective is considered in terms of minimizing a specific energy requirement and, consequently, maximizing the energy efficiency of the device.

[0031] Preferably, the second temperature value is at least - Operating pressure Sudai 2 the current Value, and - The third value representing the gas temperature at the inlet the current value, It is determined based on the following.

[0032] In relation to the present invention, a specific parameter is "represented by the current "Value" does not necessarily mean the current This does not mean that the value is equal to the value of this parameter, but rather the current This means that the value can be derived from the value of this parameter.

[0033] In this way, the second temperature value is determined based on two standard state variables of the device, and these standard state variables can be reliably and easily measured using accurate, relatively inexpensive, and readily available sensors.

[0034] More preferably, the oil-injected element is variable speed degree When driven by a motor, the second temperature value is the tenth value representing the rotational speed of the variable speed motor. the current Further determination is made based on the value.

[0035] As a result, when a second temperature value is determined, the rotational speed of the variable-speed motor, and consequently the variable power supplied to the gas compression process by this variable-speed motor, are taken into consideration.

[0036] Furthermore, the second temperature value is optionally or additionally limited, preferably, according to a second temperature interval between a second minimum temperature limit and a second maximum temperature limit.

[0037] this is, -If the second temperature value is lower than the second minimum temperature limit, the second temperature value is set to be the same as the second minimum temperature limit. -If the second temperature value is higher than the second maximum temperature limit, the second temperature value will be set to be the same as the second maximum temperature limit. - If the second temperature value is within the second temperature interval between the second minimum temperature limit and the second maximum temperature limit, the second temperature value is not changed. It means that.

[0038] By limiting the second temperature value to a second temperature interval, safety constraints can be considered, for example, with respect to the minimum and maximum operating temperatures of the device.

[0039] In a more preferred embodiment of the method according to the present invention, - The second reference temperature is controlled from the old temperature value to the second desired temperature value, and -To determine the second desired temperature value, the above maximum temperature value is calculated by subtracting the maximum temperature decrease from the old temperature value on the one hand, and by adding the maximum temperature increase to the old temperature value on the other hand. value It is limited according to a third temperature interval between the value plus the added value.

[0040] In this way, the change in the second reference temperature can be limited, for example, when the second reference temperature is controlled to a second desired temperature value in order to take into account safety constraints related to temperature changes within the apparatus.

[0041] Preferably, the second reference temperature is controlled from an old temperature value to a second desired temperature value over a preset time interval, and the maximum temperature decrease and maximum temperature increase values ​​are positively dependent on the length of the preset time interval.

[0042] In this way, for example, to take into account safety constraints related to the maximum absolute temperature time gradient within the apparatus, the change in the second reference temperature can be limited according to a preset time interval.

[0043] In a more preferred embodiment of the method according to the present invention, the required distribution ratio is the first the current It is determined based on a first ratio between the value and a second desired temperature value.

[0044] This first ratio is the second desired temperature value and the first the current It is a measure of the deviation of a value.

[0045] If the first ratio is less than 1, this indicates that the value of the second reference temperature is too low, and the required distribution ratio must be chosen to be lower than the current value of the distribution ratio if possible. In such a case, less oil will be sent to the oil cooler, resulting in less cooling of the injected oil and an increase in the second reference temperature.

[0046] If the first ratio is greater than 1, this indicates that the value of the second reference temperature is too high, and the required distribution ratio must be chosen to be higher than the current value of the distribution ratio. In such a case, more oil will be sent to the oil cooler, resulting in the injected oil being cooled more and the second reference temperature decreasing.

[0047] Preferably, the required distribution ratio depends on a first ratio according to a first monotonically increasing function, between a minimum value of zero and a maximum value of 100%.

[0048] In this way, when there is a large deviation between the second reference temperature and the second desired temperature value, the change in the distribution ratio relative to the required distribution ratio is never small.

[0049] Alternatively, preferably, the required distribution ratio is: - First the current The value is - If it is higher than the second desired temperature value or the second desired temperature value plus the second safety margin, - If, during the first period, the temperature is higher than the second desired temperature value or the second desired temperature value plus the second safety margin, The maximum value is 100%, - Otherwise, it is the smallest zero.

[0050] This is a simple ON / OFF control, and if the reference temperature is too high, more specifically, if it is higher than a second desired temperature value or a second desired temperature value plus a second safety margin, all the oil is sent to the oil cooler.

[0051] By applying a first period before controlling the distribution ratio to a state where all oil is sent to the oil cooler, a rapid and unnecessary transition of the distribution ratio from a minimum of zero to a maximum of 100% and then back to zero can be avoided. Otherwise, this would occur if the second reference temperature is higher than the second desired temperature or the second desired temperature plus a second safety margin for a limited, harmless period shorter than the first period.

[0052] Therefore, by applying the first period, the control dynamics of the distribution means and apparatus generally do not respond, or respond very little, to harmless short-term increases in the second reference temperature. As a result, these control dynamics are more stable than when the first period is not applied.

[0053] In a more preferred embodiment of the method according to the present invention, the second reference temperature is - The temperature of the gas at the outlet of the oil-injected element, or - This is the oil temperature at the outlet of the oil injection pipe network.

[0054] At the outlet of an oil-injected element, the gas pressure within the system is highest. Consequently, the risk of condensate formation is also highest at this outlet, because higher gas pressure leads to higher gas condensation temperatures. It is necessary to ensure that the gas temperature at the outlet does not fall below the condensation temperature at this outlet. Therefore, the gas temperature at the outlet of an oil-injected element is a relevant second reference temperature within the system, with the aim of avoiding condensate formation within the system.

[0055] The oil temperature at the outlet of the oil injection pipe network determines the oil's cooling capacity. It is necessary to ensure that this cooling capacity does not become too high in order to prevent the gas temperature at a given location within the apparatus from falling below the gas's condensation temperature at that location. Therefore, the oil temperature at the outlet of the oil injection pipe network is a relevant second reference temperature within the apparatus, also for the purpose of avoiding condensation formation within the apparatus.

[0056] In a more preferred embodiment of the method according to the present invention, the required fan speed is determined based on the maximum speed value from a set of one or more speed values.

[0057] This allows the required speed to be determined based on a desired number of criteria.

[0058] Furthermore, the required speed can be adjusted to the most relevant standard, depending on the operating range of the device.

[0059] In a more preferred embodiment of the method according to the present invention, the first rate value in the set is the second reference temperature of This represents the fan speed value required to achieve the second desired temperature.

[0060] In this way, when determining the required fan speed, the first criterion is considered from the perspective of achieving a second desired temperature value. In other words, fan control in this respect has the same purpose as the distribution ratio control described above, and as a result helps to achieve the goal of distribution ratio control.

[0061] In a more preferred embodiment of the method according to the present invention, - Second reference temperature of The fourth the current If the value is higher than the preset minimum temperature, and - Distribution ratio of Fifth the current The value is higher than the predetermined minimum distribution ratio, and the fourth the current If the value is higher than the desired temperature value, The first velocity value is at least, - The sixth value representing the operating pressure the current Value, and - The seventh value represents the temperature of the gas at the inlet. the current value, It is determined based on the following.

[0062] In this way, the first velocity value is determined based on two standard state variables of the device, and these standard state variables can be reliably and easily measured using accurate, relatively inexpensive, and readily available sensors.

[0063] Preferably, when the oil-filled element is driven by a variable-speed motor, the first speed value is an eleventh value representing the rotational speed of the variable-speed motor. the current Further determination is made based on the value.

[0064] As a result, when the first speed value is determined, the rotational speed of the variable-speed motor, and consequently the variable power supplied to the gas compression process by this variable-speed motor, are taken into consideration.

[0065] Alternatively or additionally, preferably, -4th the current If the value is higher than the sum of the second desired temperature value and the first tolerance value, or -In the second period, the fourth the current If the value is higher than the sum of the second desired temperature value and the first tolerance value, or -4th the current If the value is lower than the value obtained by subtracting the second tolerance from the second desired temperature value, or -In the third period, the fourth the current If the value is lower than the value obtained by subtracting the second tolerance from the second desired temperature value, The first velocity value is at least - Distribution ratio of Fifth the current Value, and -4th the current The second ratio between the value and the second desired temperature value, Further determination will be made based on the above.

[0066] Distribution ratio of Fifth the current By determining a first speed value based on the value, the distribution ratio can be taken into consideration when determining the fan speed, and thus any interference between fan speed control and distribution ratio control can be avoided.

[0067] The second ratio is the fourth the current This is a measure of the deviation between the value and a second desired temperature value.

[0068] If the second ratio is less than 1, this indicates that the value of the second reference temperature is too low, and the required distribution ratio must be selected to be lower than the current value of the distribution ratio. In such a case, less oil will be sent to the oil cooler, resulting in less cooling of the injected oil and an increase in the second reference temperature.

[0069] If the second ratio is greater than 1, this indicates that the value of the second reference temperature is too high, and the required distribution ratio must be chosen to be higher than the current value of the distribution ratio. In such a case, more oil will be sent to the oil cooler, resulting in the injected oil being cooled more and the second reference temperature decreasing.

[0070] More preferably, the first velocity value depends on a second ratio according to a second monotonically increasing function.

[0071] In this way, when there is a large deviation between the second reference temperature and the second desired temperature value, the change in fan speed relative to the first speed value is never small.

[0072] Alternatively or additionally, more preferably, the first rate value is a fifth rate value according to a third monotonically increasing function. the current It depends on the value.

[0073] As a result, when controlled to the first speed value, the fan speed will not decrease as the distribution ratio increases, nor will it increase as the distribution ratio decreases.

[0074] This design allows the fan speed to be gradually increased as the distribution ratio increases and gradually decreased as the distribution ratio decreases, which is advantageous for the stability of fan speed control. This prevents the fan from having to suddenly start up at high speed from a stopped state when the distribution ratio increases from zero, or from suddenly stopping from high speed when the distribution ratio suddenly decreases to zero.

[0075] In a more preferred embodiment, if the device includes an aftercooler for cooling the compressed gas downstream of the oil-injected element, - Minimum effective temperature in aftercooler of 8th the current The value is the required minimum effective temperature. of If the value is higher than the second velocity value in the set, - The first velocity value, and -8th the current A third ratio between the value and the required minimum effective temperature value, It is determined based on, - Otherwise, the second velocity value is set to equal to zero.

[0076] In this way, the minimum effective temperature of the aftercooler of 8th the current If the value is too high, the fan speed can be controlled to a second speed value that is higher than the first speed value. This allows the fan to be used to adequately cool the aftercooler in addition to cooling the oil cooler, controlling the maximum temperature of the gas in the aftercooler and limiting it to the required minimum effective temperature.

[0077] Preferably, the required minimum effective temperature is equal to the second condensation temperature of the aftercooler gas plus an offset.

[0078] The formation of condensate within the aftercooler can be avoided by offsetting.

[0079] Alternatively or additionally, the second velocity value preferably depends on the third ratio according to a fourth monotonically increasing function.

[0080] In that case, the required minimum effective temperature of If there is a large deviation of the minimum effective temperature beyond the value, the second speed value will not decrease, and the minimum effective temperature will be the minimum effective temperature required at the acceleration speed. of The value cannot be deviated from further.

[0081] In a more preferred embodiment of the method according to the present invention, the third velocity value in the set is - First reference temperature of 9th the current Value, and - First reference temperature of Pre-set maximum value, The third velocity value is determined based on the following: -9th the current If the value is lower than the preset maximum value, it is equal to zero, and -9th the current If the value is higher than the preset maximum value, it is equal to the value representing the fan's maximum speed.

[0082] In this way, the fan speed can be adjusted to a third speed value determined by exceeding a preset maximum value, which is, for example, the maximum value of the first reference temperature of a gas that, for safety reasons, must not rise above.

[0083] The present invention further provides, in order to carry out the method according to any of the embodiments described above, - A first computational control unit comprising a control unit for controlling a second reference temperature in a device for compressing gas to a second desired temperature value, - A second calculation and control unit for controlling the first reference temperature of the device to a first desired temperature value, This relates to a computational control assembly equipped with the following features.

[0084] Finally, the present invention relates to a gas compression apparatus comprising such a computational control assembly according to the present invention.

[0085] It is clear that such computational control assemblies and such devices offer the same advantages as the methods according to the embodiments of the present invention described above.

[0086] To better illustrate the features of the present invention, several preferred embodiments of the method, computational control assembly, and apparatus according to the present invention are described below non-limitingly and illustratively with reference to the accompanying drawings. [Brief explanation of the drawing]

[0087] [Figure 1] This shows an apparatus equipped with a computational control assembly according to the present invention. [Figure 2] A schematic diagram of the method according to the present invention is shown. [Modes for carrying out the invention]

[0088] Figure 1 shows a device 1 for compressing gas, which includes an oil-injected element 2 that draws in gas at its inlet 3 and compresses this gas to an operating pressure at its outlet 4.

[0089] Within the scope of the present invention, apparatus 1 is interpreted as a complete compressor or vacuum pump system, including, in particular, oil-injected elements 2 in the form of compressor or vacuum pump elements, all typical connecting pipes and valves, a possible housing for apparatus 1, and a motor 5 for driving the oil-injected elements 2.

[0090] In relation to the present invention, the oil-injected element 2 is understood as an element housing in which gas is compressed by the motion of a rotating rotor or a reciprocating piston.

[0091] In this regard, as a non-limiting example, the oil-filled element 2 may comprise one or more screw rotors, gear rotors, baffles, lobes, or pistons.

[0092] If the device 1 includes a compressor element, the inlet 3 of the device 1 is typically fluidically connected to the atmospheric environment of the device 1. If the device 1 includes a vacuum pump element, the inlet 3 is typically fluidically connected to a user network or a sealed space at near-atmospheric pressure.

[0093] Furthermore, the device 1 includes an oil injection pipe network 6 having an outlet 7 for injecting oil into the oil injection element 2.

[0094] In this regard, within the scope of the present invention, it is not excluded that the oil injection pipe network 6 comprises a plurality of outlets 7 for injecting oil into the oil injection element 2.

[0095] The compression of gas in the oil-injected element 2 generates heat of compression that heats the gas. In order to keep the temperature of the compressed gas at outlet 4 of the oil-injected element 2 below a specific maximum safety limit, the temperature of the injected oil must be below the maximum level corresponding to this safety limit. On the other hand, the temperature of the compressed gas at outlet 4 must not fall below a first condensation temperature of the gas at outlet 4, or below the first condensation temperature plus a first safety margin, in order to avoid the formation of condensate at outlet 4. As a result, the temperature of the injected oil must be above the minimum level corresponding to this first condensation temperature or the first condensation temperature plus a first safety margin. Therefore, the temperature of the gas at outlet 4 of the oil-injected element 2 and, accordingly, the temperature of the oil at outlet 7 of the oil injection pipe network 6 must be controlled to values ​​within a correspondingly limited temperature interval at both ends.

[0096] For this purpose, the oil injection pipe network 6 is configured - For example, a distribution means 8 for distributing oil to a first part and a second part, such as a thermostat control valve, - An oil cooler 10, cooled by a fan 9, for cooling the first part, - A bypass 11 to route the second section past the oil cooler 10, It is equipped with.

[0097] The speed of fan 9 is variable and is driven by a second motor 12. This makes it possible to control the cooling of the first portion of the injected oil, for example, by adjusting the speed of fan 9.

[0098] More generally, in the present invention, the speed of the fan 9 is adjusted so that the first reference temperature of the device 1 is controlled to a first desired temperature value.

[0099] The distribution means 8 and bypass 11 are provided to divert the second portion of the injected oil beyond the oil cooler 10, thereby more or less limiting the cooling of the injected oil by the oil cooler 10 by controlling the distribution ratio of the first portion of the oil. In this way, the second reference temperature of the device 1 can be controlled to a second desired temperature value, which is, for example, the temperature of the compressed gas at the outlet 4 of the oil injection element 2 or the temperature of the oil at the outlet 7 of the oil injection pipe network 6. The first reference temperature controlled by the fan 9 can be the same as the second reference temperature, in which case the first desired temperature value is equal to the second desired temperature value.

[0100] To control the distribution ratio, device 1 is first performance It is equipped with a calculation control unit 13. performance The calculation control unit 13 is - A calculation unit 14 for determining a second desired temperature value and - Second reference temperature of A control unit 15 for adjusting the distribution ratio of the first portion to a second desired temperature based on the first current value, It is equipped with.

[0101] In this case, control unit 15 is designed, for example, as a PID control device or an ON / OFF control device.

[0102] In this case, the second reference temperature of First the current The value is provided by measurement using a temperature sensor, for example, a first temperature sensor 16 at the outlet 4 of the oil-injection element 2 or a second temperature sensor 17 at the outlet 7 of the oil injection pipe network 6.

[0103] The second desired temperature value is at least, - The second operating pressure the current Value (this second the current The value is provided, for example, by measurement using the first pressure sensor 18 at the outlet 4 of the oil-injected element 2, and -The third point indicating the gas temperature at inlet 3 the current Value (this third the current The value is provided, for example, by measurement using the third temperature sensor 19 at the inlet 3 of the device 1. This is determined by the calculation unit 14 based on the above.

[0104] In addition, it is possible to consider the atmospheric pressure measurement at inlet 3, which is provided, for example, by measurement using a second pressure sensor 20 at inlet 3 of device 1. However, the absolute standard value of atmospheric pressure can simply be assumed to be 1 bar or 1 atmosphere, which means that this measurement of atmospheric pressure, and consequently the second pressure sensor 20, is not strictly necessary for the present invention.

[0105] Similarly, it is possible to consider measuring the relative humidity at inlet 3 using, for example, the humidity sensor 21 at inlet 3. Alternatively, a worst-case relative humidity value of 100% can be assumed for this gas at inlet 3. In the latter case, measuring the relative humidity at inlet 3, and consequently the humidity sensor 21, is not strictly necessary for the present invention.

[0106] The second desired temperature value determined by the calculation unit 14, and the second desired temperature value of Based on the first current value, the control unit 15 determines the required distribution ratio and controls the distribution ratio of the first portion of the oil to this required distribution ratio.

[0107] In Figure 1, the distribution means 8 is located downstream of the oil cooler 10 and the bypass 11. However, in relation to the present invention, it is not excluded that the distribution means 8 be located upstream of the oil cooler 10 and / or the bypass 11, for example, at the point where the piping to the oil cooler 10 and the bypass 11 diverge from each other.

[0108] To control the speed of the fan 9, the device 1 includes a second calculation control unit 22.

[0109] The second arithmetic control unit 22, together with the first arithmetic control unit 13, forms an arithmetic control assembly according to the present invention.

[0110] The control of fan 9 can have the purpose of controlling the second reference temperature to a second desired temperature value, similar to the control of the distribution ratio of the first portion of oil as described above. In that case, the first reference temperature will be the same as the second reference temperature, and the first desired temperature value will be equal to the second desired temperature value.

[0111] In that case, the second reference temperature of The fourth the current The value is higher than the second desired temperature value, and the distribution ratio of Fifth the current If the value is higher than the preset minimum distribution ratio, then the second calculation control unit 22 performs at least, - The sixth operating pressure the current Value (6th the current The value is provided, for example, by measurement using the first pressure sensor 18 at the outlet 4 of the oil-injected element 2, and - The seventh point indicating the gas temperature at inlet 3 the current Value (7th the current The value is provided, for example, by measurement using a third temperature sensor 19. The required speed of fan 9 is determined based on this.

[0112] The fourth the currentThe value can be provided, for example, by measurement using the first temperature sensor 16 or the second temperature sensor 17.

[0113] The second desired temperature value is determined by the second calculation control unit 22. Total Obtained from calculation unit 14.

[0114] Next, in order to take into account the distribution ratio of the first portion of oil when controlling the speed of fan 9, the required speed of fan 9 of To determine a specific value, the distribution ratio of Fifth the current The value can also be considered. This fifth the current The value can be provided by measuring the position of the distribution means 8 or by using the flow sensor 23, thereby allowing the opening of the distribution means 8 and, consequently, the distribution ratio of the first portion of the oil to be measured.

[0115] Of course, in relation to the present invention, the second arithmetic control unit 22 is directly connected to the fifth control unit 15 (not shown in Figure 1) the current It is not impossible to obtain a value. In that case, the position sensor or flow sensor 23 is no longer necessary and can be omitted.

[0116] Furthermore, Figure 1 shows that the gas compressed by the oil-injected element 2 can be passed through, for example, an oil separator 24, in which the compressed gas is purified by separating the oil previously injected into the oil-injected element 2 from the compressed gas before the compressed gas is expelled from the device 1.

[0117] The oil separated by the oil separator 24, if present, is, in this case, preferably reinjected into the oil-injectable element 2 via the oil injection pipe network 6.

[0118] Optionally, the compressed gas can be sent to the aftercooler 25 before leaving the device 1, whether or not it is purified. In this aftercooler 25, the compressed gas can be cooled by the same fan 9 used in the oil cooler 10. In this case, the speed of the fan 9 can be controlled so that the minimum effective temperature of the gas in the aftercooler 25 is below the required minimum effective temperature. In this case, the first reference temperature is equal to the minimum effective temperature of the gas in the aftercooler 25. The fan 9 controls the required minimum effective temperature and the minimum effective temperature of 8th the current Controlled based on the value, this 8th the current The value is measured, for example, using a fourth temperature sensor 26 located in an appropriate position on the aftercooler 25.

[0119] Furthermore, the speed of fan 9 is set to a first reference temperature, for example, in locations within device 1 where the temperature is generally relatively high and needs to be kept below the maximum value for safety reasons. of Control can also be performed based on a preset maximum value. Here, the first reference temperature is, for example, the temperature of the motor 5, the second motor 12, or the frequency converter of the device 1. Alternatively, the first reference temperature can be the temperature of the gas discharged from the aftercooler 25.

[0120] Next, the speed of fan 9 is determined by the input, the first reference temperature. of 9th the current Controlled using a value, this ninth the current The value is measured, for example, using a fifth temperature sensor 27.

[0121] In relation to the present invention, it is not impossible for the fifth temperature sensor 27 to be, for example, the first temperature sensor 16 or the second temperature sensor 17.

[0122] If motor 5 is a variable speed motor, calculation Unit 14, in determining the second desired temperature, indicates the rotational speed of motor 5. the currentThe second calculation control unit 22 also considers the value, and when determining the required speed of the fan 9, it considers the 11th value indicating the rotational speed of the motor 5. the current The value can also be taken into consideration.

[0123] Figure 2 shows a schematic overview of the method according to the present invention.

[0124] As mentioned above, the second reference temperature of The second desired temperature value is determined by the calculation unit 14.

[0125] In this case, the second desired temperature value is determined based on the maximum temperature value within the group of two temperature values. This is shown in Figure 2 by the first maximization operator MAX1.

[0126] Therefore, the first temperature value T1 in the above group represents the value of a second reference temperature at which the temperature of the compressed gas at the outlet 4 of the oil-injected element 2 is equal to the first condensation temperature of the compressed gas at the outlet 4 of the oil-injected element 2, or the temperature obtained by adding a first safety margin to this first condensation temperature.

[0127] The first condensation temperature can be determined by methods known to those skilled in the art, for example, as described in International Publication No. 2018 / 033827.

[0128] When determining the first temperature value, a value T is representative of the value obtained by adding or not adding the first safety margin to the first condensation temperature. cond In this case as well, the first minimum temperature limit T min,1 and the first maximum temperature limit T max,1 The temperature can be limited according to a first temperature interval between the first condensation temperature and the second temperature. This limitation, which is either the first condensation temperature plus or without a first safety margin, is performed by the first limiting operator LIM1.

[0129] If the second reference temperature is the gas temperature at the outlet 4 of the oil-injected element 2, then the first minimum temperature limit T min,1 and the first maximum temperature limit T max,1The value may vary, for example, between 0 °C and 120 °C, and this value can be set with an accuracy of, for example, 1 °C.

[0130] The second temperature value within the above group is the value T of the second reference temperature at which the specific energy requirement of the device 1 is minimized. SER It represents.

[0131] When the motor 5 is a fixed-speed motor, the value T of this second reference temperature SER is the second the current value α2 representing the operating pressure and the third the current value α3 representing the temperature of the gas at the inlet 3, and can be calculated, for example, according to the following formula: T SER = B·α3 + C·α2 + D (Equation 1)

[0132] When the motor 5 is a variable-speed motor, the value T of this second reference temperature SER is the second the current value α2 representing the operating pressure, the third the current value α3 representing the temperature of the gas at the inlet 3, and the tenth the current value α 10 representing the rotational speed of the motor 5, and can be calculated, for example, according to the following formula: T SER = A·α 10 + B·α3 + C·α2 + D (Equation 2)

[0133] Here, the current the value α 10 is the value of the rotational speed of the motor 5 determined as a percentage of the maximum rotational speed of the motor 5.

[0134] In the above Equations 1 and 2, the value T of the second reference temperature SER is expressed in °C, the second the current value α2 is determined as the operating pressure in bar units, and the third the current value α3 is determined as the temperature of the gas at the inlet 3 in °C units.

[0135] When the second reference temperature is the gas temperature at the outlet 4 of the oil-injected element 2, the possible value intervals for the constants A, B, C, and D in equations 1 and 2 above are as follows: JPEG0007848338000001.jpg9150 JPEG0007848338000002.jpg7150 JPEG0007848338000003.jpg7150 JPEG0007848338000004.jpg7150

[0136] Once the second temperature value T2 is determined, the value T SER This is the second minimum temperature limit T min,2 and the second maximum temperature limit T max,2 The value T can be limited according to a second temperature interval between . SER This restriction is enforced by the second restriction operator LIM2.

[0137] If the second reference temperature is the gas temperature at the outlet 4 of the oil-injected element 2, then the second minimum temperature limit T min,2 and the second maximum temperature limit T max,2 The value may vary, for example, between 0°C and 120°C, and this value can be set with an accuracy of, for example, 1°C.

[0138] If the second reference temperature is arbitrarily controlled from the old temperature value to the second desired temperature value, the above maximum temperature value, which is the result of the first maximization operator MAX1, is, on the one hand, the decrease in temperature from the old temperature value to the maximum temperature decrease value ΔT. max,down The value obtained by subtracting ΔT is used, while the old temperature value is used for the maximum temperature increase ΔT. max,up The temperature can be limited according to a third temperature interval between the added value and the actual temperature. This prevents excessive decreases or increases in the second reference temperature. This limitation of the maximum temperature value is performed by the third limiting operator LIM3.

[0139] Here, in order to control the old temperature value to a second desired temperature value, a preset time interval Δt can be determined, and the maximum temperature decrease value ΔT max,downand maximum temperature increase value Δ Tmax,up This depends positively on the length of this predetermined time interval Δt.

[0140] Optionally, the second desired temperature value is, on the other hand, the third minimum temperature limit value T. min,3 On the other hand, there is a third maximum temperature limit T max,3 It can be further restricted according to a fourth temperature interval between and .

[0141] If the second reference temperature is the gas temperature at the outlet 4 of the oil-injected element 2, then the third minimum temperature limit T min,3 To prevent the formation of condensate at outlet 4, this can be set to a value between 20°C and 80°C, for example, with an accuracy of 1°C.

[0142] Alternatively, if the oil injection pipe network 6 further includes a heat recovery system (not shown in Figure 1) that can recover heat from the oil separated by the oil separator 24 into a heat-absorbing fluid, a third minimum temperature limit value T min,3 This can be set to a high value, for example, 105°C. Third minimum temperature limit value T min,3 Because of this high value, the heat recovery system can recover more heat from the oil in the oil injection pipe network 6, even when the temperature of the heat-absorbing fluid is relatively high.

[0143] Third maximum temperature limit Value T max,3 This can be set to a value between, for example, 100°C and 120°C, with an accuracy of, for example, 1°C.

[0144] The second desired temperature value determined in this way by the calculation unit 14 is used by the control unit 15 as the second reference temperature. of A first ratio β1 between a first current value α1 and this second desired temperature value is further used to determine the required distribution ratio.

[0145] The required distribution ratio can be determined as a continuous ratio between a minimum value of zero and a maximum value of 100%, depending on a first ratio β1, according to a first monotonically increasing function.

[0146] On the other hand, the required distribution ratio is, It can also be determined as a binary proportion. During the operation of device 1, - The first current value α 1 but, Higher than the second desired temperature value or the second desired temperature value plus a second safety margin. case , or, - The first current value α 1 but, During the first period, a value higher than the second desired temperature value or the second desired temperature value plus the second safety margin. In that case, Binary ratio The maximum value is 100%. , -Otherwise The binary ratio is The smallest zero value 。

[0147] Here, the second safety margin can be set to a value between, for example, 0°C and 20°C, with an accuracy of, for example, 0.1°C.

[0148] The first period can be set to a value between, for example, 0 seconds and 255 seconds.

[0149] Based on the required distribution ratio determined by the control unit 15, the distribution means 8 is then operated to actually achieve this required distribution ratio.

[0150] The required speed of the fan 9 for controlling the first reference temperature to a first desired temperature value is determined using the second calculation control unit 22.

[0151] For this purpose, the required speed is selected as the highest speed value from a set of speed values, in this case three speed values. This is illustrated in Figure 2 by the second maximization operator MAX2.

[0152] In the above set, the first velocity value v1 is, in that case, the second reference temperature of This represents the speed value of fan 9 required to achieve the second desired temperature value.

[0153] When device 1 is in a first operating range that has not yet warmed up, i.e., a second reference temperature of The fourth the current If the value α4 is lower than a preset minimum temperature, for example 90°C, required to complete the first operating region of this warm-up, then the first speed value v1 is equal to zero.

[0154] The fourth the current In the second operating region of device 1 where the value α4 is higher than the preset minimum temperature, the distribution ratio is lower than the preset minimum distribution ratio, or the fourth the current If the value α4 is lower than the second desired temperature value, the first velocity value v1 is still equal to zero.

[0155] The predetermined minimum distribution ratio can be set, for example, as a value between 0% and 100%, with an accuracy of, for example, 1%.

[0156] On the other hand, in the second operating area, distribution ratio of Fifth the current The value α5 is higher than the preset minimum distribution ratio, and the fourth the current If the value α4 is higher than the second desired temperature value, the first velocity value v1 is at least - The sixth value representing the operating pressure the current The value α6, and - The seventh value representing the gas temperature at inlet 3 the current Value α7, It is determined based on the following.

[0157] If motor 5 is a variable speed motor, when the first speed value v1 is determined, the rotational speed of motor 5 is expressed according to, for example, the following formula. Sudai 11 the current Value α 11 This will also be taken into consideration. v1=v 1,raw =E·α11 +F·α7+G·α6+H (Equation 7)

[0158] Here, the current Value α 11 This is the value of the rotational speed of motor 5, which is determined as a percentage of the maximum rotational speed of motor 5.

[0159] In equation 7 above, the first velocity value v1 is determined as a percentage of the maximum speed of fan 9, and the sixth the current The value α6 is determined as the operating pressure in bar units, and the seventh the current The value α7 is determined as the gas temperature at inlet 3 in degrees Celsius.

[0160] When the second reference temperature is the gas temperature at the outlet 4 of the oil-injected element 2, the possible value intervals for the constants E, F, G, and H in Equation 7 are as follows: JPEG0007848338000005.jpg7150 JPEG0007848338000006.jpg7150 JPEG0007848338000007.jpg7150 JPEG0007848338000008.jpg7150

[0161] In the following cases, namely, -4th the current If the value α4 is higher than the value obtained by adding the first tolerance to the second desired temperature value, or -In the second period, the fourth the current If the value α4 is higher than the value obtained by adding the first tolerance to the second desired temperature value, or -4th the current If the value α4 is lower than the value obtained by subtracting the second tolerance from the second desired temperature value, or -In the third period, the fourth the current If the value α4 is lower than the value obtained by subtracting the second tolerance from the second desired temperature value, The first velocity value v1 is at least - Distribution ratio of Fifth the current The value α5, and -4th the current The second ratio β2 between the value α4 and the second desired temperature value, Further determination will be made based on the above.

[0162] The first and second tolerance values ​​can be set, for example, between values ​​of 0°C and 20°C, with an accuracy of, for example, 0.1°C.

[0163] The second and third periods can be set to values ​​ranging from, for example, 0 seconds to, for example, 255 seconds.

[0164] The first velocity value v1 in this case preferably depends on the second ratio β2 according to the second monotonically increasing function, and alternatively or additionally, preferably according to the following formula, the fifth according to the third monotonically increasing function. the current It depends on the value α5. v1=v 1,raw ·α5^P·β2^Z (Equation 12)

[0165] The possible value intervals for the constants P and Z in Equation 12 are as follows: P=0-4 (Equation 13) Z=0-4 (Equation 14)

[0166] The second velocity value v2 in the above set is determined as follows: - Minimum effective temperature of Aftercooler 25 of 8th the current The value α8 is the required minimum effective temperature. of If it is higher than the value, the second velocity value v2 is, - The first velocity value v1, and -8th the current The third ratio β3 between the value α8 and the required minimum effective temperature value. It is determined based on, - Otherwise, the second velocity value v2 is set to zero.

[0167] The required minimum effective temperature is equal to the second condensation temperature of the gas in the aftercooler 25 plus an offset.

[0168] The second rate value v2 preferably depends on the third ratio β3 according to a fourth monotonically increasing function. Minimum effective temperature of aftercooler 25 of 8th the current The value α8 is the required minimum effective temperature. of If the value is higher than the first value, the second velocity value v2 is calculated, for example, according to the following formula: v2=v1 · β3^P (Equation 15)

[0169] In equation 15 above, the second speed value v2 is determined as a percentage of the maximum speed of fan 9.

[0170] The possible value intervals for the constant P are already given in Equation 13.

[0171] The third velocity value v3 in the above set is, - First reference temperature of 9th the current The value α9, and - First reference temperature of Pre-set maximum value, Determined based on the third velocity value v 3 is, -9th the current If the value α9 is lower than the preset maximum value, it is zero. -9th the current If the value α9 is higher than the preset maximum value, it represents the maximum speed of fan 9.

[0172] The preset maximum value can be set, for example, between 90°C and 120°C, with an accuracy of, for example, 1°C.

[0173] Finally, based on the requested speed determined by the second arithmetic control unit 22, the second motor 12 is activated, and the fan 9 actually operates at the requested speed.

[0174] The present invention is not limited to the embodiments described and illustrated as examples, and any method, computational control device, or apparatus according to the present invention can be implemented in any variety of modifications without departing from the scope of the invention as defined in the claims. [Explanation of symbols]

[0175] 1 device 2. Oil-filled element 6. Oil injection pipe network 8 Distribution means 9 Fans 10 Oil cooler 11 Bypass 15 Control Unit

Claims

1. A method for controlling a first reference temperature in a gas compression apparatus (1) to a first desired temperature value, wherein the apparatus (1) comprises the following components, namely - An oil-injectable element (2) for drawing in the gas at the inlet (3) of the device (1) and compressing the gas to the operating pressure at the outlet (4) of the oil-injectable element (2), - An oil injection pipe network (6) having an outlet (7) for injecting oil into the oil injection element (2), The oil injection pipe network (6) is provided with, - Distributing means (8) for distributing the oil to the first part and the second part, - An oil cooler (10) cooled by a fan (9) for cooling the first part, - A bypass (11) is provided to route the second portion past the oil cooler (10), Equipped with, First, - In order to bring the second reference temperature of the apparatus (1) to a second desired temperature value, the required distribution ratio of the first part is determined, and the second reference temperature is the temperature of the gas at the outlet (4) of the oil-injectable element (2), or the temperature of the oil at the outlet (7) of the oil injection pipe network (6), - The distribution ratio of the first portion is controlled to the required distribution ratio, after that - In order to bring the first reference temperature to the first desired temperature value, the required speed of the fan (9) is determined, and if the first reference temperature is the same as the second reference temperature, the required speed is determined based on the second desired temperature value and the distribution ratio. - The speed of the fan (9) is controlled to the required speed, The distribution ratio is determined using the control unit (15). - The first current value α of the second reference temperature 1 , and - The second desired temperature value, A method that takes input and is controlled based on a non-fuzzy logic algorithm.

2. The second desired temperature value is determined based on the maximum temperature value within the group including the first temperature value T1 and the second temperature value T2. The first temperature value T1 is, - The first condensation temperature of the gas at the outlet (4), or - The temperature obtained by adding a first safety margin to the first condensation temperature, This represents the value of the second reference temperature that is equal to the above, The method according to claim 1, wherein the second temperature value T2 represents the value of the second reference temperature at which the specific energy requirement of the apparatus (1) is minimized.

3. The first temperature value T 1 This is the first minimum temperature limit T min,1 and the first maximum temperature limit T max,1 The method according to claim 2, limited according to a first temperature interval between and .

4. The second temperature value T 2 At least - The second current value α representing the operating pressure 2 , and - A third current value α representing the temperature of the gas at the inlet (3) 3 , The method according to claim 2, determined based on the above.

5. The second temperature value T 2 is limited according to a second temperature interval between a second minimum temperature limit value T min,2 and a second maximum temperature limit value T max,2 The method according to claim 2, wherein the method is limited according to a second temperature interval between the second minimum temperature limit value T and the second maximum temperature limit value T

6. - The second reference temperature is controlled from the current temperature value to the second desired temperature value, and - In order to determine the second desired temperature value, the maximum temperature value is, on the one hand, the current temperature value minus the maximum temperature decrease ΔT max,down The value obtained by subtracting the maximum temperature increase value ΔT from the current temperature value, and on the other hand, the current temperature value plus the maximum temperature increase value ΔT max,up It is limited according to a third temperature interval between the value plus the added value. The method according to feature 2.

7. The second reference temperature is controlled from the current temperature value to the second desired temperature value at a preset time interval Δt, and the maximum temperature decrease value ΔT max,down and the maximum temperature increase value ΔT max,up The method according to claim 6, wherein the length of the predetermined time interval Δt is positively dependent on the length of the predetermined time interval Δt.

8. The required distribution ratio is the first current value α. 1 The first ratio β between and the second desired temperature value 1 The method according to claim 2, determined according to the method described in claim 2.

9. The required distribution ratio is between a minimum value of zero and a maximum value of 100%, following the first ratio β according to a first monotonically increasing function. 1 The method according to claim 8, which depends on the method.

10. The required distribution ratio is, - The first current value α 1 but, - If it is higher than the second desired temperature value or the second desired temperature value plus a second safety margin, - If, during the first period, the temperature is higher than the second desired temperature value or the second desired temperature value plus the second safety margin, It has a maximum value of 100%, - Otherwise, the minimum zero value, The method according to claim 8, wherein the method is characterized by having the following features.

11. The required speed is determined based on the maximum speed value in a set including a first speed value v1, a second speed value v2, and a third speed value v3. The apparatus (1) includes an aftercooler (25) downstream of the oil-injected element (2) for cooling the gas, and the aftercooler (25) is cooled by the fan (9). The first speed value v1 represents the speed value of the fan (9) required to achieve the second desired temperature value of the second reference temperature, If the eighth current value α8 of the minimum effective temperature in the aftercooler (25) is higher than the required minimum effective temperature value, then the second rate value v2 is - The first velocity value v1, and - The third ratio β3 between the eighth current value α8 and the required minimum effective temperature value, It is determined based on, If the eighth current value α8 is less than or equal to the required minimum effective temperature, the second velocity value v2 is set to zero. The third velocity value v3 is, - The ninth current value α9 of the first reference temperature, and - The preset maximum value of the first reference temperature, It is determined based on, The third velocity value v3 is, - If the current value α9 of the ninth term is lower than the preset maximum value, it is equal to zero. - The method according to claim 1, wherein if the current value α9 of the ninth is higher than the preset maximum value, it is equal to the value representing the maximum speed of the fan (9).

12. - The fourth current value α of the second reference temperature 4 However, if the temperature is higher than the preset minimum temperature, - The fifth current value α of the distribution ratio 5 However, it is higher than the predetermined minimum distribution ratio, and the fourth current value α 4 However, if it is higher than the second desired temperature value, The first velocity value v 1 At least - The sixth current value α representing the operating pressure 6 , and - A seventh current value α representing the temperature of the gas at the inlet (3) 7 , The method according to claim 11, determined based on the following:

13. - The fourth current value α 4 However, if the value is higher than the sum of the second desired temperature value and the first allowable value, - In the second period, the fourth current value α 4 However, if the value is higher than the sum of the second desired temperature value and the first allowable value, - The fourth current value α 4 However, if the value is lower than the second desired temperature value minus the second allowable value, - In the third period, the fourth current value α 4 However, if the value is lower than the second desired temperature value minus the second allowable value, The first velocity value v 1 At least - The fifth current value α of the distribution ratio 5 , and - The fourth current value α 4 The second ratio β between and the second desired temperature value 2 , The method according to claim 12, further determined based on the above.

14. The first velocity value v 1 The second ratio β follows a second monotonically increasing function. 2 The method according to claim 13, which depends on the method.

15. The first velocity value v 1 The fifth current value α follows a third monotonically increasing function. 5 The method according to claim 13, which depends on the method.

16. The method according to claim 11, wherein the required minimum effective temperature is equal to the value obtained by adding an offset to the second condensation temperature of the gas in the aftercooler (25).

17. The second velocity value v 2 The third ratio β follows a fourth monotonically increasing function. 3 The method according to claim 11, which depends on the method.

18. A computational control assembly, for carrying out the method according to claim 1, - A first calculation control unit (13) is provided with a control unit (15) for controlling a second reference temperature in a gas compression device (1) to a second desired temperature value, - A second calculation control unit (22) for controlling the first reference temperature of the apparatus (1) to a first desired temperature value, A computational control assembly equipped with the following features.

19. An apparatus for compressing gas, comprising the calculation control assembly described in claim 18.

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