CN113694700A - Automatic multistage dry air dew point adjusting system and method - Google Patents
Automatic multistage dry air dew point adjusting system and method Download PDFInfo
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Abstract
The invention provides a multistage dry air dew point automatic regulating system and a method, wherein the dew point automatic regulating system comprises an air inlet pipeline, a moisture processing unit, a dry air processing unit, a dry and wet air mixing unit, a dew point automatic regulating unit, a linkage control unit and an air outlet pipeline, wherein the air inlet pipeline is respectively connected with the moisture processing unit and the dry air processing unit so that one part of air is regulated by the moisture processing unit and then outputs normal temperature air, and the other part of air is regulated by the dry air processing unit and then outputs air at a specified dew point temperature; the dry and wet gas mixing unit mixes the two parts of air to obtain mixed gas; the linkage control unit can control the dew point automatic regulating unit to regulate the output flow of the two parts of air, so that the dew point of the mixed gas reaches the preset dew point temperature. The invention can set the dew point to automatically adjust so as to obtain the required dew point dry air, and has the advantages of high adjusting speed, uniform gas mixing and small dew point error.
Description
Technical Field
The invention relates to a compressed air drying system, in particular to a multi-stage dry air dew point automatic adjusting system and a method.
Background
The general procedure for putting a long-distance natural gas pipeline into production is as follows: pressure testing, dewatering, drying, replacement and production. Residual water and steam exist in the pipeline after pressure testing is finished, and the residual water and the steam need to be removed through water removal and drying processes, otherwise, a series of problems of pipeline corrosion, natural gas hydrate formation, conveying efficiency reduction and the like can be caused. Among them, the dry air drying method is widely used because of its advantages of low drying cost, uniform drying effect, small potential safety hazard, etc.
To guide the relevant research work on the dry air drying method, the dry air drying effect at different dew points needs to be tested. The existing drying equipment such as a dryer cannot obtain dry air at any preset dew point from the structure and the working principle of the drying equipment, and the existing dew point adjusting device has the defects of long response time, inaccurate adjustment, inconvenient operation and the like. For example, an adsorption dryer dew point accurate control system and an adjustment method disclosed in 2016, 8, 17, and patent document No. CN 105854441 a describe a dew point control system including a compressed air duct, a cooling dehydration unit, a dust filter unit, an adsorption dryer unit, and a user online dew point meter, wherein the compressed air duct is connected to the cooling dehydration unit and the dust filter unit in sequence, the dust filter unit is connected in two ways, one way is connected to the adsorption dryer unit, the other way is connected to a common gas electric control valve and a common gas bypass, and the user online dew point meter is arranged in a user main pipe. Although the system can reasonably match the normal gas with the cleaner, the adjusting range is limited and the adjusting speed is slow. A linkage control system and a control method for a compressed air dew point temperature header pipe disclosed in 24/4/2020, and patent document with publication number CN 111054190 a describe a control system including a controller, a dryer and a first dew point instrument arranged at an output end of the dryer, wherein the controller is respectively connected with the first dew point instrument and the dryer, the number of the dryers is plural, the output end of each dryer is provided with the first dew point instrument, the dryers are connected in parallel, an input end of each dryer is connected with an air source, the output end of each dryer is connected with an air using device through an air supply integration pipe, the input end of each dryer is respectively connected with an output end of each air supply branch pipe, the air supply header pipe is provided with a second dew point instrument, and the second dew point instrument is connected with the controller. Although the system can solve the problems of unstable air supply dew point and large energy waste caused by regeneration of the dryer under the condition of only the dryer, the adjustment process is complex, the operation is not convenient enough, the dew point temperature is also influenced by the dryer, and the adjustment range is very limited.
Therefore, it is necessary to invent a device capable of precisely adjusting the dew point of dry air, which can obtain the dry air with the required dew point by presetting the dew point, and has the advantages of wide adjustment range, high adjustment speed, small dew point error and stable pressure flow.
Disclosure of Invention
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, one of the objects of the present invention is to provide a multistage dry air dew point automatic adjustment system and method which can achieve multistage adjustment of a dry air dew point and have a wide dew point adjustment range.
In order to achieve the above object, in one aspect, the present invention provides a multi-stage dry air dew point automatic regulating system, which includes an air inlet pipeline, a moisture processing unit, a dry air processing unit, a dry-wet air mixing unit, a dew point automatic regulating unit, a linkage control unit, and an air outlet pipeline, wherein the air inlet pipeline is respectively connected to the moisture processing unit and the dry air processing unit, so that a part of air is regulated by the moisture processing unit and then outputs normal temperature air, and another part of air is regulated by the dry air processing unit and then outputs air at a specified dew point temperature; the moisture processing unit comprises a moisture main pipe, and a first flow meter and a first electric regulating valve which are sequentially connected to the moisture main pipe, wherein the first flow meter can monitor the flow of the part of air output by the moisture main pipe, and the first electric regulating valve can control the flow of the part of air through regulating the opening of the valve; the dry gas treatment unit comprises a dry gas main pipe, and a freezing type dryer, a first dew point branch pipe, a second flow meter and a second electric regulating valve which are sequentially connected to the dry gas main pipe, wherein the first dew point branch pipe and the second dew point branch pipe are arranged in parallel and are positioned between the freezing type dryer and the second flow meter; the first dew point branch pipe is provided with a first valve, and the dew point of the other part of air entering the main dry gas pipe is reduced to a first specified dew point temperature from normal temperature after being processed by the freeze dryer in the opening state of the first valve; the second dew point branch pipe is provided with a second valve and an adsorption dryer, the dew point of the other part of air entering the main dry gas pipe is reduced to a second specified dew point temperature from the normal temperature after being treated by the freezing dryer and the adsorption dryer under the condition that the second valve is opened, and the second specified dew point temperature is less than the first specified dew point temperature; the second flow meter can monitor the flow of the other part of air output by the main dry gas pipe, and the second electric regulating valve can control the flow of the other part of air by regulating the opening of the valve; the dry and wet air mixing unit is respectively connected with the wet air processing unit and the dry air processing unit and comprises an air storage tank, and the air storage tank can mix the part of air output by the wet air main pipe and the other part of air output by the dry air main pipe to form mixed air; the automatic dew point adjusting unit is connected with the dry and wet gas mixing unit and comprises an emptying valve, a dew point instrument and a third electric adjusting valve which are sequentially arranged, the emptying valve can empty the mixed gas of which the dew point does not reach the preset dew point temperature in the dry and wet gas mixing unit, the dew point instrument can monitor the dew point temperature of the mixed gas, and the third electric adjusting valve can control the output flow of the mixed gas; the linkage control unit is respectively connected with the wet gas processing unit, the dry gas processing unit and the dew point automatic regulating unit and can perform linkage control on the first electric regulating valve, the second electric regulating valve, the third electric regulating valve and the emptying valve, so that when the mixed gas dew point does not reach the preset dew point temperature, the third electric regulating valve is closed, the emptying valve is opened, and the first electric regulating valve and the second electric regulating valve respectively regulate the opening degree of the valves to control the mixing proportion of the part of air output by the wet gas main pipe and the other part of air output by the dry gas main pipe, so that the mixed gas with the preset dew point temperature is obtained; when the mixed gas dew point reaches the preset dew point temperature, the third electric valve is opened, the emptying valve is closed, and the first electric regulating valve and the second electric regulating valve respectively regulate the opening degree of the valves to maintain the dew point of the mixed gas to be stable at the preset dew point temperature; the gas outlet pipeline is connected with the dew point automatic regulating unit so as to output mixed gas with preset dew point temperature.
In an exemplary embodiment of the multistage dry air dew point automatic regulating system of the present invention, the first designated dew point temperature may be 0 ℃ to 3 ℃, the second designated dew point temperature may be-61 ℃ to-58 ℃, and the preset dew point temperature may be-60 ℃ to 25 ℃.
In an exemplary embodiment of the multistage dry air dew point automatic regulating system of the present invention, the dry gas treatment unit may further comprise a precooler installed before the freeze dryer and capable of reducing the temperature of the another portion of air entering the dry gas main.
In an exemplary embodiment of the multistage dry air dew point automatic regulating system of the present invention, the outlet of the wet gas main may extend to the center of the dry gas main to promote the mixing of the portion of air output by the wet gas main and the another portion of air output by the dry gas main.
In an exemplary embodiment of the multistage dry air dew point automatic regulating system of the present invention, the dry-wet gas mixing unit may further include a static mixer disposed before the air storage tank to promote mixing of the portion of air output from the wet gas main and the another portion of air output from the dry gas main.
In an exemplary embodiment of the multistage dry air dew point automatic regulating system of the present invention, a swirl mixer may be disposed at a gas inlet of the air storage tank, and the swirl mixer may promote mixing of the portion of air output by the wet gas main pipe and the other portion of air output by the dry gas main pipe.
In an exemplary embodiment of the multistage dry air dew point automatic regulating system of the present invention, the dew point automatic regulating system may include a plurality of filters respectively installed in the wet gas treating unit, the dry gas treating unit and the dry and wet gas mixing unit to control an oil content in the mixed gas to be 0.001ppm or less and a solid impurity content to be 0.001 μm or less.
In an exemplary embodiment of the multi-stage dry air dew point automatic regulating system of the present invention, the outlet of the blow-off valve may be provided with a silencer capable of reducing noise generated when the mixed gas is blown off.
In an exemplary embodiment of the multistage dry air dew point automatic regulating system of the invention, the linkage control unit may include a controller, the controller is configured with an input panel and a blending proportion adjusting module, the input panel is capable of inputting a preset dew point temperature, and the blending proportion adjusting module is configured to be capable of respectively controlling the opening sizes of the first electric regulating valve and the second electric regulating valve according to the current dew point change rate, so as to achieve that the dew point of the mixed gas reaches the preset dew point temperature.
The invention also provides a multistage dry air dew point automatic adjusting method, wherein the dry air dew point is obtained by adopting the dew point automatic adjusting system to carry out automatic adjustment, and the dew point automatic adjusting method comprises the following steps: s1, starting the dew point automatic regulating system, and setting the first appointed dew point temperature T output by the freezing type dryer1And a second specified dew point temperature T output by the adsorption type dryer2And inputting a preset dew point temperature T in the linkage control unitIs provided withThen compressed air is fed into the intake line, the compressed air being fed at a temperature T0(ii) a S2, when the dew point temperature T is presetIs provided withHas a value range of T1<TIs provided with≤T0When the air conditioner is used, the first valve is opened, the second valve is closed, one part of compressed air enters the air storage tank after passing through the main moisture pipe, the other part of compressed air enters the air storage tank after being processed by the freeze dryer through the first dew point branch pipe, and the two parts of compressed air are mixed to obtain mixed air; or when the preset dew point temperature T isIs provided withHas a value range of T2≤TIs provided with≤T1When the air conditioner is used, the second valve is opened, the first valve is closed, one part of compressed air enters the air storage tank after passing through the main moisture pipe, the other part of compressed air enters the air storage tank after being jointly processed by the freezing type dryer and the adsorption type dryer through the second dew point branch pipe, and the two parts of compressed air are mixed to obtain mixed gas; s3, when the dew point temperature of the mixed gas does not reach the preset dew point temperature, closing the third electric regulating valve by using the linkage control unit, opening the emptying valve, and simultaneously respectively regulating the opening degrees of the first electric regulating valve and the second electric regulating valve according to the flow data measured by the first flowmeter and the second flowmeter so as to control the mixing proportion of the part of air output by the wet gas main pipe and the other part of air output by the dry gas main pipe, thereby obtaining the mixed gas with the preset dew point temperature; s4, when the mixed gas dew point reaches the preset dew point temperature, the linkage control unit is used for opening the third electric regulating valve and closing the emptying valve, and meanwhile, the opening degrees of the first electric regulating valve and the second electric regulating valve are respectively regulated according to dew point data measured by a dew point meter so as to maintain the mixed gas dew point to be stable at the preset dew point temperatureThe point temperature.
Compared with the prior art, the beneficial effects of the invention comprise at least one of the following:
(1) the invention can input the required dew point in the system, automatically adjust and obtain the dry air with any set dew point within the range of-60 ℃ to 25 ℃ so as to meet the experiment or production requirement of the dry air with the specific dew point;
(2) the dry air dew point can be adjusted in multiple stages, the dew point adjusting range is wider, when the preset dew point is within the range of 3-25 ℃ (excluding 3 ℃), only the freezing dryer is started, so that the dew point adjustment within the range is easier to realize, and when the preset dew point is within the range of-60-3 ℃, both the freezing dryer and the adsorption dryer are started to ensure that the outlet dew point of the adsorption dryer can reach-60 ℃ and keep constant;
(3) the invention has the advantages of high dew point regulation speed, uniform gas mixing and small dew point error;
(4) the dry air obtained by the invention has stable pressure, flow and dew point.
Drawings
The above and other objects and/or features of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a schematic structural view of an automatic dew point regulating system in an exemplary embodiment of the multistage dry air dew point regulating system of the present invention.
FIG. 2A shows a schematic process flow diagram for conditioning high dew point dry air in an exemplary embodiment of the multi-stage dry air dew point auto-adjustment method of the present invention.
FIG. 2B shows a schematic process flow diagram for conditioning low dew point dry air in an exemplary embodiment of the multi-stage dry air dew point auto-adjustment method of the present invention.
Description of reference numerals:
1-an air inlet pipeline, 2-a wet gas main pipe, 3-a dry gas main pipe, 4-a first dew point branch pipe, 5-a second dew point branch pipe, 6-an air outlet pipeline, 7-a first flowmeter, 8-a first electric regulating valve, 9-a freezing dryer, 10-a first valve, 11-a second valve, 12-an adsorption dryer, 13-a second flowmeter, 14-a second electric regulating valve, 15-a static mixer, 16-an air storage tank, 17-an emptying valve, 18-a dew point instrument, 19-a third electric regulating valve, 20-a controller, 21-a third valve, 22-a first filter, 23-a fourth valve, 24-a second filter, 25-a third filter, 26-a fourth filter and 27-a fifth valve, 28-sixth valve.
Detailed Description
Hereinafter, the multistage dry air dew point automatic adjusting system and method of the present invention will be described in detail with reference to exemplary embodiments.
It should be noted that "first", "second", "third", "fourth", etc. are merely for convenience of description and for convenience of distinction, and are not to be construed as indicating or implying relative importance. "upper," "lower," "inner," and "outer" are merely for convenience of description and relative orientation or positional relationship, and do not indicate or imply that the referenced components must have that particular orientation or position. For those of ordinary skill in the art, the term "pressure" in part herein corresponds to pressure.
Most of the existing compressed air dew point control systems adopt a freeze dryer or an adsorption dryer to obtain the dew point temperature required by a user, but the output dew point temperature of the freeze dryer is narrow in range, the lowest output dew point temperature can only reach-15 ℃, and if the dry air with lower dew point (for example, lower than-15 ℃) is required to be obtained, the dry air can only pass through the adsorption dryer. However, the output dew point temperature of the adsorption dryer is not adjustable, which directly results in that the dew point temperature is also influenced by the dryer, and only the dew point temperature of the adsorption dryer can be output, and the adjustment range is very limited.
The inventor finds out through research that: the method is characterized in that a freezing dryer and an adsorption dryer are simultaneously used in a compressed air dew point control system, compressed air is divided into two pipelines to be processed, one pipeline is connected with an electric regulating valve and outputs 'moisture' (namely, normal-temperature compressed air) with a dew point of a high-temperature extreme value, the other pipeline is connected with the freezing dryer, the adsorption dryer and the electric regulating valve, the compressed air is cooled and dried and then outputs 'dry air' (namely, dry air with a dew point of a dryer output temperature) with a dew point of a low-temperature extreme value, the two pipelines of air with extreme dew points are mixed, and the ratio of the two pipelines of air is controlled through the electric regulating valve, so that the dry air with any dew point value in two extreme dew point value ranges can be obtained. When the dry gas is output for treatment, the dry gas pipeline can be divided into a high dew point branch pipe and a low dew point branch pipe, and part of air is treated by the high dew point branch pipe or the low dew point branch pipe through the switching valve, so that dry air with any dew point in a set range can be obtained. For example, if the dew point is desired to be obtained in a higher range (e.g., 3 ℃ to 25 ℃), the valve may be switched to only open the freeze dryer, and at this time, the extreme dew point value of the output "dry air" is higher, so that it is easier to control the ratio of the two paths of air to obtain dry air with a dew point in a higher range (e.g., 3 ℃ to 25 ℃). If the dew point to be obtained is in a lower range (for example, -60 ℃ -3 ℃), the valve can be switched to open the freeze dryer and the adsorption dryer at the same time, at the moment, the extreme dew point value of the output dry air is lower, and the dry air with the dew point in the lower range (for example, -60 ℃ -3 ℃) can be obtained by controlling the proportion of the two paths of air.
In order to achieve the above object, an aspect of the present invention provides a multi-stage dry air dew point automatic adjusting system. In an exemplary embodiment of the invention, the multi-stage dew point automatic adjustment system may include an air intake line, a moisture processing unit, a dry gas processing unit, a dry and wet gas mixing unit, an automatic dew point adjustment unit, a coordinated control unit, and an air outlet line.
Specifically, the air inlet pipeline is respectively connected with the moisture processing unit and the dry air processing unit, so that one part of air is regulated by the moisture processing unit and then outputs normal-temperature air, and the other part of air is regulated by the dry air processing unit and then outputs air at a specified dew point temperature. That is, the wet gas processing unit and the dry gas processing unit are disposed in parallel while processing the compressed air output from the intake line.
The wet gas processing unit comprises a wet gas main pipe, and a first flow meter and a first electric regulating valve which are sequentially connected to the wet gas main pipe. The first flow meter can monitor the flow rate of the part of air (namely, moisture) output by the moisture main pipe, and the first electric regulating valve can control the flow rate of the part of air (namely, moisture) by regulating the opening degree of the valve.
The dry gas treatment unit comprises a dry gas main pipe, and a freezing type dryer, a first dew point branch pipe, a second flowmeter and a second electric regulating valve which are sequentially connected to the dry gas main pipe. The first dew point branch pipe and the second dew point branch pipe are arranged in parallel and are located between the freeze dryer and the second flow meter. The first dew point branch pipe (namely, the high dew point branch pipe) is provided with a first valve, and in the opening state of the first valve, the dew point of the other part of air (namely, the dry gas) entering the dry gas main pipe is reduced to a first specified dew point temperature from normal temperature after being processed by the freeze dryer. And the second dew point branch pipe (namely the low dew point branch pipe) is provided with a second valve and an adsorption dryer, and the dew point of the other part of air (namely the dry air) entering the main dry air pipe is reduced to a second specified dew point temperature from normal temperature after being treated by the freeze dryer and the adsorption dryer under the condition that the second valve is opened. And the second specified dew point temperature is less than the first specified dew point temperature, for example, the first specified dew point temperature may be 0 ℃ to 3 ℃, the second specified dew point temperature may be-61 ℃ to-58 ℃, and the preset dew point temperature may be-60 ℃ to 25 ℃. The second flow meter can monitor the flow rate of the other part of air (namely, the dry gas) output by the dry gas main pipe, and the second electric regulating valve can control the flow rate of the other part of air (namely, the dry gas) by regulating the valve opening.
Of course, a flow meter and an electric control valve may be respectively provided for the first dew point branch pipe and the second dew point branch pipe to respectively control the output flow rates of the dry gas at the first specified dew point temperature and the second specified dew point temperature.
When the dry gas dew point needs to be lowered to the second specified dew point temperature, the freeze dryer and the adsorption dryer need to be connected in series, because the freeze dryer and the adsorption dryer may have a service life deteriorated if frequently switched, and the freeze dryer may have a cooling function of the pre-cooler to lower the air temperature so that the adsorption dryer lowers the air dew point to the second specified dew point temperature.
The dry and wet air mixing unit is respectively connected with the wet air processing unit and the dry air processing unit and comprises an air storage tank, and the air storage tank can mix the part of air output by the wet air main pipe and the other part of air output by the dry air main pipe to form mixed air. The gas holder can stabilize gas pressure and flow, and the inside entrance of gas holder can be provided with the swirler for promote the mixture of dry and wet gas.
Dew point automatically regulated unit is connected with dry wet gas mixing unit to including atmospheric valve, dew point meter and the third electrical control valve that sets gradually, atmospheric valve can not reach the mist unloading of presetting dew point temperature with dew point among the dry wet gas mixing unit, and dew point meter can monitor mist's dew point temperature, and third electrical control valve can control mist's output flow.
The linkage control unit is respectively connected with the wet gas processing unit, the dry gas processing unit and the dew point automatic regulating unit, and can carry out linkage control on the first electric regulating valve, the second electric regulating valve, the third electric regulating valve and the emptying valve, so that when the mixed gas dew point does not reach the preset dew point temperature, the third electric regulating valve is closed, the emptying valve is opened, and the first electric regulating valve and the second electric regulating valve respectively regulate the opening degree of the valves to control the mixing proportion of the part of air output by the wet gas main pipe and the other part of air output by the dry gas main pipe, so that the mixed gas with the preset dew point temperature is obtained. And when the mixed gas dew point reaches the preset dew point temperature, the third electric valve is opened, the emptying valve is closed, and the first electric regulating valve and the second electric regulating valve respectively regulate the opening degree of the valves so as to maintain the dew point of the mixed gas to be stable at the preset dew point temperature.
The air outlet pipeline is connected with the dew point automatic regulating unit to output mixed gas with preset dew point temperature, and the mixed gas is dry air with preset dew point value.
In this embodiment, the dry gas treatment unit may further comprise a pre-cooler, which is installed before the freeze dryer and is capable of reducing the temperature of the another portion of air entering the dry gas main.
In this embodiment, the main dry gas pipe is connected to the main wet gas pipe, and the main wet gas pipe outlet extends to the center of the main dry gas pipe, so that the wet gas and the dry gas can be mixed better.
Further, the dry-wet air mixing unit may further include a static mixer disposed before the air storage tank to promote mixing of the portion of air output by the wet air main and the another portion of air output by the dry air main.
In this embodiment, the dew point automatic adjusting system may include a plurality of filters respectively installed in the wet gas processing unit, the dry gas processing unit and the dry and wet gas mixing unit, the filters being capable of filtering oil and solid impurities in the air to control the oil content in the mixed gas to be less than or equal to 0.001ppm and the solid impurity content to be less than or equal to 0.001 μm.
In this embodiment, the outlet of the blow valve may be provided with a silencer to reduce noise generated when the mixed gas is blown down.
In this embodiment, the linkage control unit may include a controller, the controller is configured with an input panel and a blending ratio adjustment module, the input panel is capable of inputting a preset dew point temperature, and the blending ratio adjustment module is configured to be capable of respectively controlling the opening sizes of the first electric control valve and the second electric control valve according to a change rate of a current dew point, so as to achieve that the dew point of the mixed gas reaches the preset dew point temperature. For example, the blending ratio adjusting module may be configured with an algorithm for adjusting the opening sizes of the first electric regulating valve and the second electric regulating valve, the algorithm may control the opening of the second electric regulating valve to be constant all the time, and the indicator of the regulator for controlling the first electric regulating valve to be changed between 4 and 20 according to the change rate of the current dew point, wherein the indicator is fully closed when the indicator is 4, the adjusted dew point is the lowest, the indicator is fully open when the indicator is 20, and the adjusted dew point is the highest.
The invention provides a multistage dry air dew point automatic adjusting method. In an exemplary embodiment of the invention, the dry air dew point is obtained by automatic adjustment of the dew point automatic adjusting system, and the multistage dry air dew point automatic adjusting method can comprise the following steps:
s1, starting the dew point automatic regulating system, and setting the first appointed dew point temperature T output by the freezing type dryer1And a second specified dew point temperature T output by the adsorption type dryer2And inputting a preset dew point temperature T in the linkage control unitIs provided withThen compressed air is fed into the intake line, the compressed air being fed at a temperature T0。
S2, when the dew point temperature T is presetIs provided withHas a value range of T1<TIs provided with≤T0When the air storage tank is used, the first valve is opened, the second valve is closed, one part of compressed air enters the air storage tank after passing through the main moisture pipe, the other part of compressed air enters the air storage tank after being processed by the freeze dryer through the first dew point branch pipe, and mixed gas is obtained after the two parts of compressed air are mixed.
Or when the preset dew point temperature T isIs provided withHas a value range of T2≤TIs provided with≤T1When the air storage tank is used, the second valve is opened, the first valve is closed, one part of compressed air enters the air storage tank after passing through the main moisture pipe, the other part of compressed air enters the air storage tank after being jointly processed by the freezing type dryer and the adsorption type dryer through the second dew point branch pipe, and mixed gas is obtained after the two parts of compressed air are mixed.
And S3, when the dew point temperature of the mixed gas does not reach the preset dew point temperature, closing the third electric regulating valve by using the linkage control unit, opening the emptying valve, and simultaneously respectively regulating the opening degrees of the first electric regulating valve and the second electric regulating valve according to the flow data measured by the first flowmeter and the second flowmeter so as to control the mixing proportion of the part of air output by the wet gas main pipe and the other part of air output by the dry gas main pipe, thereby obtaining the mixed gas with the preset dew point temperature.
And S4, when the mixed gas dew point reaches the preset dew point temperature, opening the third electric regulating valve by using the linkage control unit, closing the emptying valve, and simultaneously respectively regulating the opening degrees of the first electric regulating valve and the second electric regulating valve according to the dew point data measured by the dew point meter so as to maintain the mixed gas dew point to be stable at the preset dew point temperature.
For a better understanding of the above-described exemplary embodiments of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and specific examples.
Fig. 1 is a schematic structural diagram of a multi-stage dry air dew point automatic regulating system. As shown in fig. 1, the multistage dry air dew point automatic adjusting system is composed of an air intake line 1, a main wet gas line 2, a main dry gas line 3, a first dew point branch line 4, a second dew point branch line 5, an air outlet line 6, a first flow meter 7, a first electric regulating valve 8, a freeze dryer 9, a first valve 10, a second valve 11, an adsorption dryer 12, a second flow meter 13, a second electric regulating valve 14, a static mixer 15, an air storage tank 16, an emptying valve 17, a dew point meter 18, a third electric regulating valve 19, a controller 20, a third valve 21, a first filter 22, a fourth valve 23, a second filter 24, a third filter 25, a fourth filter 26, a fifth valve 27, and a sixth valve 28.
Specifically, the multi-stage dry air dew point automatic adjusting system may include an air intake line 1, a moisture processing unit, a dry air processing unit, a dry and wet air mixing unit, a dew point automatic adjusting unit, a controller 20, and an air outlet line 6.
Wherein the air inlet line 1 is connected with a wet gas processing unit and a dry gas processing unit, respectively.
The wet gas processing unit includes a wet gas main pipe 2, and a third valve 21, a first filter 22, a first flow meter 7, and a first electric regulator valve 8 which are provided in this order on the wet gas main pipe 2. The main wet gas pipe 2 is used for conveying the normal temperature wet gas which is not dried, and the third valve 21 is used for communicating the air inlet pipeline 1 and the main wet gas pipe 2. The first filter 22 is disposed before the first flow meter 7 to filter oil content and solid impurities in the input air. The first flow meter 7 is used for monitoring the flow rate of the wet gas in the main wet gas pipe 2, and the first electric control valve 8 is used for flow rate regulation to control the blending ratio of the subsequent dry wet gas.
The dry gas treatment unit comprises a dry gas main pipe 3, a fourth valve 23, a second filter 24, a freeze dryer 9, a third filter 25, a first dew point branch pipe 4, a second dew point branch pipe 5, a second flow meter 13 and a second electric regulating valve 14, wherein the fourth valve 23, the second filter 24, the freeze dryer 9, the third filter 25, the first dew point branch pipe 4 and the second dew point branch pipe 5 are arranged on the dry gas main pipe 3. The dry gas main pipe 3 is used for conveying dried low dew point dry gas, and the fourth valve 23 is used for communicating the air inlet pipeline 1 with the dry gas main pipe 3. A second filter 24 is arranged before the freeze dryer 9 for filtering oil content and solid impurities in the incoming air. The freeze dryer 9 can lower the dew point of the input air from the normal temperature to the first predetermined dew point temperature, and the first predetermined dew point temperature output from the freeze dryer 9 is 3 ℃. A third filter 25 is arranged before the freeze dryer 9 and the connection of the first dew point branch 4 with the second dew point branch 5 for re-filtering the oil content and solid impurities in the dry air at the first specified dew point temperature. The main dry gas pipe 3 is divided into a first dew point branch pipe 4 and a second dew point branch pipe 5 after the third filter 25, that is, the first dew point branch pipe 4 and the second dew point branch pipe 5 are arranged in parallel, the first dew point branch pipe 4 is used as a high dew point branch pipe, and the second dew point branch pipe 5 is used as a low dew point branch pipe. The first dew point branch pipe 4 is provided with a first valve 10, and the first valve 10 is used for communicating the first dew point branch pipe 4 with the main dry gas pipe 3 so as to convey dry air with a high dew point. The second dew-point branch pipe 5 is provided with a second valve 11, an adsorption dryer 12, a fourth filter 26, and a fifth valve 27 in this order. The second valve 11 is used for communicating the second dew point branch pipe 5 and the main dry gas pipe 3 to convey the dry air with low dew point. The adsorption dryer 12 is capable of lowering the dew point of the input air from a first specified dew point temperature to a second specified dew point temperature, and the second specified dew point temperature output by the adsorption dryer 12 is-60 ℃. A fourth filter 26 is provided after the adsorption dryer 12 for filtering again the oil content and the solid impurities in the dry gas. The fifth valve 27 is used for connecting the second dew point branch pipe 5 and the main dry gas pipe 3. And a second flow meter 13 and a second electric regulating valve 14 are arranged behind the first dew-point branch pipe 4 and the second dew-point branch pipe 5, the second flow meter 13 is used for monitoring the output flow of the dry gas in the dry gas main pipe 3, and the second electric regulating valve 14 is used for controlling the flow regulation of the dry gas so as to control the blending proportion of the subsequent dry and wet gas.
The joint of the main dry gas pipe 3 and the main wet gas pipe 2, and the outlet of the main wet gas pipe 2 extends to the center of the main dry gas pipe 3, so that the wet gas and the dry gas are better mixed.
The dry and wet gas mixing unit includes a static mixer 15 and a gas storage tank 16. The static mixer 15 is disposed in front of the gas storage tank 16 and is connected to the main wet gas pipe 2 and the main dry gas pipe 3, respectively, for promoting the mixing of dry and wet gases. The gas reservoir 16 is capable of stabilizing gas pressure and flow and the interior inlet is provided with a swirler to promote mixing of dry and wet gases.
The dew point automatic regulating unit is connected with the dry-wet gas mixing unit and comprises an air release valve 17, a dew point meter 18, a third electric regulating valve 19 and a sixth valve 28 which are sequentially arranged on the air outlet pipeline 6. And the emptying valve 17 is connected with an outlet of the air storage tank 16 and is used for emptying the mixed gas in the air storage tank 16 when the measured dew point does not reach the preset dew point temperature. The outlet of the emptying valve 17 is provided with a silencer, so that the noise generated when the mixed gas is emptied can be reduced. A dew point meter 18 is arranged behind the emptying valve 17 and used for monitoring the dew point of the mixed gas in the gas storage tank 16, and the precision error of the dew point meter 18 is +/-0.5 ℃. The third electrically adjustable valve 19 and the sixth valve 28 are used to control the flow rate control and delivery of the mixed gas.
The controller 20 is respectively connected with the first flow meter 7, the first electric regulating valve 8, the second flow meter 13, the second electric regulating valve 14, the emptying valve 17, the dew point instrument 18 and the third electric regulating valve 19, and is used for controlling the mixing proportion of the dry moisture and obtaining the dry air with the required dew point. The controller 20 has a dew point input panel, and can input a dew point value to automatically adjust the dew point value to obtain dry air with a desired dew point, and the input dew point value is any value within-60 ℃ to 25 ℃. The controller 20 may display the data measured by the first flow meter 7, the second flow meter 13 and the dew point meter 18.
The controller 20 carries on the flow regulation according to the mixed gas dew point measured by the dew point meter 18, when the measured dew point does not reach the set dew point, the controller 20 controls the air release valve 17 to open, the third electric control valve 19 to close, regulate the first electric control valve 8, the second electric control valve 14 opening degree according to the flow data measured by the first flowmeter 7 and the second flowmeter 13 at the same time; when the dew point reaches the set dew point, the controller 20 controls the third electric regulating valve 19 to be opened and the air release valve 17 to be closed, and when the dew point fluctuates after the third electric regulating valve 19 is opened, the controller 20 controls the first electric regulating valve 8 and the second electric regulating valve 14 to be finely adjusted to maintain the dry air at the set dew point.
FIG. 2A shows a schematic process flow diagram for conditioning to obtain high dew point dry air; FIG. 2B shows a schematic process flow diagram for conditioning to obtain low dew point dry air. The solid arrowed lines in fig. 2A indicate the flow path of the moisture, the dashed arrowed lines in fig. 2A indicate the flow path of the high dew point dry gas, and the crosses in fig. 2A indicate the valve closure. The solid arrowed lines in fig. 2B indicate the flow path of the moisture, the dashed arrowed lines in fig. 2B indicate the flow path of the low dew point dry gas, and the crosses in fig. 2B indicate the valve closure.
As shown in fig. 2A and fig. 2B, in practical application, the multi-stage dew point automatic adjustment method includes the following steps:
step 1, starting the dew point automatic regulating system in fig. 1, and setting a first specified dew point temperature T output by the freezing type dryer 91At 3 deg.C, a second specified dew point temperature T outputted from the adsorption type dryer 122At-60 deg.C, and then inputting a preset dew point temperature T on a dew point input panel of the controller 20Is provided withPreset dew point temperature TIs provided withThe selectable value range is-60 ℃ to 25 ℃, and after the air compressor is used, compressed air enters the air inlet pipeline 1 from the inlet of the left system.
Step 2, when the preset dew point temperature T is reachedIs provided withWhen the temperature is set in the range of 3 ℃ to 25 ℃ (excluding 3 ℃), that is, 3 DEG C<TIs provided withWhen the temperature is less than or equal to 25 ℃, the first valve 10 and other valves are opened, the second valve 11 and the fifth valve 27 are closed, one part of compressed air enters the static mixer 15 after passing through the main moisture pipe along a solid line with an arrow in fig. 2A, the other part of compressed air enters the static mixer 15 through the first dew-point branch pipe 4 after being processed by the freeze dryer 9 along a dotted line with an arrow in fig. 2A, the two parts of compressed air are mixed by the static mixer 15 and then enter the air storage tank 16 for further mixing, and mixed gas is obtained after mixing.
When the preset dew point temperature T is reachedIs provided withWhen the temperature is set within the range of-60 ℃ to 3 ℃, namely-60 DEG C≤TIs provided withWhen the temperature is less than or equal to 3 ℃, the second valve 11, the fifth valve 27 and other valves are opened, the first valve 10 is closed, a part of compressed air enters the static mixer 15 after passing through the main moisture pipe along a solid line with an arrow in fig. 2B, the other part of compressed air enters the static mixer 15 through the second dew-point branch pipe 5 after being jointly processed by the freezing type dryer 9 and the adsorption type dryer 12 along a dotted line with an arrow in fig. 2B, the two parts of compressed air are mixed by the static mixer 15 and then enter the air storage tank 16 for further mixing, and mixed gas is obtained.
And 3, when the mixed gas passes through the dew point instrument 18, measuring dew point data of the mixed gas by the dew point instrument 18 and transmitting the data to the controller 20. When the measured dew point does not reach the preset dew point temperature TIs provided withMeanwhile, the controller 20 controls the atmospheric valve 17 to be opened and the third electric control valve 19 to be closed, and simultaneously adjusts the opening degrees of the first electric control valve 8 and the second electric control valve 14 according to the flow data measured by the first flow meter 7 and the second flow meter 13.
Thus, dry air with required dew point can be obtained after passing through the multistage dry air dew point automatic regulating system, and the dew point of mixed gas after the gas storage tank can be any set value within the range of minus 60 ℃ to 3 ℃.
In summary, the beneficial effects of the invention include at least one of the following:
(1) the invention can input the required dew point in the system, automatically adjust and obtain the dry air with any set dew point within the range of-60 ℃ to 25 ℃ so as to meet the experiment or production requirement of the dry air with the specific dew point.
(2) The dry air dew point multistage adjustment can be realized, the dew point adjustment range is wider, when the preset dew point is in the range of 3 ℃ -25 ℃ (3 ℃ is not included), only the freezing type dryer is started, so that the dew point adjustment in the range is easier to realize, when the preset dew point is in the range of-60 ℃ -3 ℃, the freezing type dryer and the adsorption type dryer are both started, and the condition that the outlet dew point of the adsorption type dryer can reach-60 ℃ and keep constant is ensured.
(3) The invention has the advantages of high dew point regulation speed, uniform gas mixing and small dew point error.
(4) The dry air obtained by the invention has stable pressure, flow and dew point.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (10)
1. The automatic multistage dry air dew point regulating system is characterized by comprising an air inlet pipeline, a moisture processing unit, a dry gas processing unit, a dry and wet gas mixing unit, an automatic dew point regulating unit, a linkage control unit and an air outlet pipeline, wherein the air inlet pipeline is connected with the dry gas processing unit,
the air inlet pipeline is respectively connected with the wet air processing unit and the dry air processing unit so that one part of air is regulated by the wet air processing unit and then outputs normal-temperature air, and the other part of air is regulated by the dry air processing unit and then outputs air at a specified dew point temperature;
the moisture processing unit comprises a main moisture pipe, and a first flow meter and a first electric regulating valve which are sequentially connected to the main moisture pipe, wherein the first flow meter can monitor the flow of the part of air output by the main moisture pipe, and the first electric regulating valve can control the flow of the part of air through regulating the opening of the valve;
the dry gas treatment unit comprises a dry gas main pipe, and a freezing type dryer, a first dew point branch pipe, a second flow meter and a second electric regulating valve which are sequentially connected to the dry gas main pipe, wherein the first dew point branch pipe and the second dew point branch pipe are arranged in parallel and are positioned between the freezing type dryer and the second flow meter; the first dew point branch pipe is provided with a first valve, and the dew point of the other part of air entering the main dry gas pipe is reduced to a first specified dew point temperature from normal temperature after being processed by the freeze dryer in the opening state of the first valve; the second dew point branch pipe is provided with a second valve and an adsorption dryer, the dew point of the other part of air entering the main dry gas pipe is reduced to a second specified dew point temperature from the normal temperature after being treated by the freezing dryer and the adsorption dryer under the condition that the second valve is opened, and the second specified dew point temperature is less than the first specified dew point temperature; the second flow meter can monitor the flow of the other part of air output by the main dry gas pipe, and the second electric regulating valve can control the flow of the other part of air by regulating the opening of the valve;
the dry and wet air mixing unit is respectively connected with the wet air processing unit and the dry air processing unit and comprises an air storage tank, and the air storage tank can mix the part of air output by the wet air main pipe and the other part of air output by the dry air main pipe to form mixed air;
the automatic dew point adjusting unit is connected with the dry and wet gas mixing unit and comprises an emptying valve, a dew point instrument and a third electric adjusting valve which are sequentially arranged, the emptying valve can empty the mixed gas of which the dew point does not reach the preset dew point temperature in the dry and wet gas mixing unit, the dew point instrument can monitor the dew point temperature of the mixed gas, and the third electric adjusting valve can control the output flow of the mixed gas;
the linkage control unit is respectively connected with the wet gas processing unit, the dry gas processing unit and the dew point automatic regulating unit, and can perform linkage control on the first electric regulating valve, the second electric regulating valve, the third electric regulating valve and the emptying valve, so that when the mixed gas dew point does not reach the preset dew point temperature, the third electric regulating valve is closed, the emptying valve is opened, and the first electric regulating valve and the second electric regulating valve respectively regulate the opening degree of the valves to control the mixing proportion of the part of air output by the wet gas main pipe and the other part of air output by the dry gas main pipe, thereby obtaining the mixed gas with the preset dew point temperature; when the mixed gas dew point reaches the preset dew point temperature, the third electric valve is opened, the emptying valve is closed, and the first electric regulating valve and the second electric regulating valve respectively regulate the opening degree of the valves to maintain the dew point of the mixed gas to be stable at the preset dew point temperature;
and the gas outlet pipeline is connected with the dew point automatic adjusting unit so as to output mixed gas with preset dew point temperature.
2. The automatic multistage dry air dew point regulating system according to claim 1, wherein the first specified dew point temperature is 0 ℃ to 3 ℃, the second specified dew point temperature is-61 ℃ to-58 ℃, and the preset dew point temperature is-60 ℃ to 25 ℃.
3. The multi-stage dry air dew point automatic regulating system of claim 2, wherein the dry gas processing unit further comprises a precooler installed before the freeze dryer and capable of reducing the temperature of the another portion of air entering the dry gas main.
4. The multi-stage dry air dew point automatic regulating system of claim 3, wherein the outlet of the wet gas main extends to a center of the dry gas main to promote blending of the portion of air output by the wet gas main and the another portion of air output by the dry gas main.
5. The multi-stage dry air dew point automatic regulating system of claim 4, wherein the dry-wet gas mixing unit further comprises a static mixer disposed before the air storage tank to promote mixing of the portion of air output by the wet gas main and the another portion of air output by the dry gas main.
6. The multi-stage dry air dew point automatic regulating system of claim 5, wherein a swirl mixer is arranged at a gas inlet of the air storage tank, and the mixing of the part of the air output by the wet gas main pipe and the other part of the air output by the dry gas main pipe in the air storage tank can be promoted.
7. The automatic multistage dry air dew point regulating system of claim 6, wherein the automatic dew point regulating system comprises a plurality of filters respectively installed in the wet gas treatment unit, the dry gas treatment unit and the dry and wet gas mixing unit to control the oil content in the mixed gas to be less than or equal to 0.001ppm and the solid impurity content to be less than or equal to 0.001 μm.
8. The automatic multistage dry air dew point regulating system of claim 7, wherein the outlet of the blow-down valve is provided with a silencer capable of reducing noise generated when the mixed gas is blown down.
9. The automatic multistage dry air dew point regulating system according to claim 8, wherein the linkage control unit comprises a controller, an input panel and a blending proportion regulating module are arranged on the controller, the input panel can input a preset dew point temperature, and the blending proportion regulating module is configured to control the opening degree of the first electric regulating valve and the second electric regulating valve respectively according to the change rate of the current dew point so as to achieve the purpose of enabling the dew point of the mixed gas to reach the preset dew point temperature.
10. A multi-stage dry air dew point automatic adjusting method, wherein the dry air dew point is automatically adjusted by using the dew point automatic adjusting system according to any one of claims 1 to 9, and the dew point automatic adjusting method comprises the following steps:
s1, starting the dew point automatic regulating system, and setting the first appointed dew point temperature T output by the freezing type dryer1And a second specified dew point temperature T output by the adsorption type dryer2And inputting a preset dew point temperature T in the linkage control unitIs provided withThen compressed air is fed into the intake line, the compressed air being fed at a temperature T0；
S2, when the dew point temperature T is presetIs provided withHas a value range of T1<TIs provided with≤T0When the first valve is opened, the second valve is closed, one part of compressed air enters the air storage tank after passing through the main wet gas pipe, and the other part of compressed air enters the air storage tank after passing through the main wet gas pipeThe partial compressed air is processed by a freezing type dryer and then enters an air storage tank through a first dew point branch pipe, and the two parts of compressed air are mixed to obtain mixed gas; alternatively, the first and second electrodes may be,
when the preset dew point temperature T is reachedIs provided withHas a value range of T2≤TIs provided with≤T1When the air conditioner is used, the second valve is opened, the first valve is closed, one part of compressed air enters the air storage tank after passing through the main moisture pipe, the other part of compressed air enters the air storage tank after being jointly processed by the freezing type dryer and the adsorption type dryer through the second dew point branch pipe, and the two parts of compressed air are mixed to obtain mixed gas;
s3, when the dew point temperature of the mixed gas does not reach the preset dew point temperature, closing the third electric regulating valve by using the linkage control unit, opening the emptying valve, and simultaneously respectively regulating the opening degrees of the first electric regulating valve and the second electric regulating valve according to the flow data measured by the first flowmeter and the second flowmeter so as to control the mixing proportion of the part of air output by the wet gas main pipe and the other part of air output by the dry gas main pipe, thereby obtaining the mixed gas with the preset dew point temperature;
and S4, when the mixed gas dew point reaches the preset dew point temperature, opening the third electric regulating valve by using the linkage control unit, closing the emptying valve, and simultaneously respectively regulating the opening degrees of the first electric regulating valve and the second electric regulating valve according to the dew point data measured by the dew point meter so as to maintain the mixed gas dew point to be stable at the preset dew point temperature.
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| US5554230A (en) * | 1995-06-01 | 1996-09-10 | Surface Combustion, Inc. | Low dew point gas generator cooling system |
| CN105854441A (en) * | 2016-06-07 | 2016-08-17 | 安徽欣创节能环保科技股份有限公司 | Precise dew point control system and adjustment method of adsorption drier |
| US20190076782A1 (en) * | 2017-09-14 | 2019-03-14 | Seibu Giken Co., Ltd. | Dry Room For Gas Substitution |
| CN111054190A (en) * | 2019-12-28 | 2020-04-24 | 宁波杭州湾新区祥源动力供应有限公司 | Linkage control system and method for compressed air dew point temperature main pipe |
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2021
- 2021-09-16 CN CN202111085666.8A patent/CN113694700B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5554230A (en) * | 1995-06-01 | 1996-09-10 | Surface Combustion, Inc. | Low dew point gas generator cooling system |
| CN105854441A (en) * | 2016-06-07 | 2016-08-17 | 安徽欣创节能环保科技股份有限公司 | Precise dew point control system and adjustment method of adsorption drier |
| US20190076782A1 (en) * | 2017-09-14 | 2019-03-14 | Seibu Giken Co., Ltd. | Dry Room For Gas Substitution |
| CN111054190A (en) * | 2019-12-28 | 2020-04-24 | 宁波杭州湾新区祥源动力供应有限公司 | Linkage control system and method for compressed air dew point temperature main pipe |
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