A high-efficiency purification and drying integrated pretreatment system for CCER pipeline methane gas

Abstract

This invention discloses an integrated pretreatment system for high-efficiency purification and drying of methane gas in a CCER pipeline, relating to the field of methane gas monitoring technology. It includes: a time-series data module for acquiring inlet-side moisture content, outlet-side moisture content, and flow rate status data according to a detection cycle, forming a periodic gas flow rate and a time-series cycle data chain; and a shielding identification module for reading adjacent cycles along the time-series cycle data chain, determining the gas flow delay cycle number based on the periodic gas flow rate and effective gas path volume, and pairing the inlet-side moisture content change cycle with the outlet-side moisture content response cycle shifted according to the gas flow delay cycle number. This invention pairs the inlet-side moisture content change cycle with the shifted outlet-side moisture content response cycle, thereby enabling the identification of low-flow shielding sections and recording of shielded water vapor volume when the inlet-side moisture content change direction has been formed but the outlet-side moisture content has not formed the same change direction.

Description

Technical Field

[0001] This invention relates to the field of methane gas monitoring technology, specifically to a CCER pipeline methane gas high-efficiency purification and drying integrated pretreatment system. Background Technology

[0002] In the process of monitoring methane gas in CCER pipelines, it is usually necessary to transport the methane gas drawn from the pipeline sampling point to the gas sensor for detection. Since the sampled gas may contain liquid water, oily impurities and water vapor, if it is not purified and dried before entering the gas sensor, it can easily affect the gas sensor's intake status and detection stability. Existing methane gas pretreatment devices typically achieve pre-separation via an oil-water separator and adsorb and dry water vapor using a silica gel drying cylinder, while simultaneously recording the methane gas flow status using a flow meter. This type of structure can meet the purification and drying requirements of conventional sampling gases and is suitable for most methane detection scenarios under stable flow conditions. Regarding the operating status of the drying medium, common methods include judging whether the output side water content exceeds the allowable inlet water content, or replacing and maintaining the drying medium based on fixed usage time and fixed maintenance cycle. However, in CCER pipeline methane gas monitoring, the sampling flow rate may decrease in stages, and the change in water content on the inlet side has already occurred, while the water content on the outlet side has not yet formed a synchronous response due to gas passage delay, flow rate reduction, and the remaining carrying capacity of the drying medium. At this time, it is difficult to reflect the advancement state of the water vapor front inside the drying medium in a timely manner based solely on whether the water content on the outlet side exceeds the allowable inlet water content, and it is also difficult to identify situations where the water content on the outlet side still meets the inlet requirements but the drying medium already has a hidden risk of decay. Therefore, it is necessary to construct an integrated pretreatment system that can identify low-flow-rate shielding sections, record the position of the water vapor front, and determine the hidden decay state of the drying medium based on the temporal relationship between inlet-side water content, outlet-side water content, flow rate data, periodic gas flow rate, and the remaining carrying capacity of the drying medium section. Therefore, this invention proposes an integrated pretreatment system for high-efficiency purification and drying of methane gas in CCER pipelines. Summary of the Invention

[0003] The purpose of this invention is to provide an integrated pretreatment system for high-efficiency purification and drying of methane gas in CCER pipelines, in order to solve the problems mentioned in the background art.

[0004] This invention can be achieved through the following technical solution: a high-efficiency purification, drying, and integrated pretreatment system for methane gas in CCER pipelines, comprising: The time-series data module is used to acquire data on the moisture content of the inlet side, the moisture content of the outlet side, and the flow rate status according to the detection cycle, forming a cycle-through gas volume and time-series cycle data chain; The shielding identification module is used to read adjacent cycles along the time-series periodic data chain, determine the number of gas passage delay cycles based on the gas flow rate and effective gas path volume, pair the water content change cycle on the inlet side with the water content response cycle on the outlet side shifted according to the number of gas passage delay cycles, and determine a low flow shielding section when the water content change direction on the inlet side has been formed but the water content on the outlet side has not formed the same change direction, and record the amount of shielded water vapor. The leading edge propulsion module is used to divide the drying medium into a sequence of carrying sections arranged along the direction of methane gas passage, and deduct the remaining carrying capacity of each section according to the amount of shading water vapor; when the remaining carrying capacity of a section enters the range of leading edge migration margin, the subsequent shading water vapor amount is written into the current carrying section and the next carrying section according to the leading edge distribution relationship, forming a water vapor leading edge position record. The risk recording module is used to form a risk section record when the output side moisture content does not exceed the allowable inlet air moisture content, and the sum of the remaining capacity of each carrying section between the water vapor front and the output side is lower than the total amount of inlet side water vapor input in the subsequent preset number of detection cycles. The attenuation judgment module is used to form a verification window after the period is recorded in the risk section and the gas volume recovers to a stable range. The detection period when the cumulative water vapor input first reaches the sum of the remaining carrying capacity of the section is taken as the expected response period, and the detection period when the output side water content changes from a stable state to an increasing state is taken as the actual response period. When the actual response period is the same as or adjacent to the expected response period, the implicit attenuation judgment result of the drying medium is formed.

[0005] A further technical improvement of the present invention is that the method by which the masking recognition module determines the number of delay cycles for gas passage includes: Read the cycle of water content change on the inlet side and use the cycle of water content change on the inlet side as the starting cycle for calculating the number of delay cycles for gas passage; Starting from the calculation start period, the gas volume passing through the period is accumulated cycle by cycle along the time-series period data chain in ascending order of the detection period identifier, forming a cumulative gas volume sequence; When the cumulative gas volume of the previous detection cycle is less than the effective gas path volume, and the cumulative gas volume of the current detection cycle is not less than the effective gas path volume, the current detection cycle is defined as a cross-detection cycle. The difference between the effective gas path volume and the cumulative gas volume before crossing the detection cycle is taken as the gas volume to be passed within the crossing detection cycle, and the difference between the periodic gas volume across the detection cycle and the gas volume to be passed within the crossing detection cycle is determined as the remaining gas volume for crossing. When the remaining gas volume reaches the preset response assigned gas volume, the crossing detection cycle is determined as the output side moisture content response cycle; when the remaining gas volume does not reach the preset response assigned gas volume, the next detection cycle of the crossing detection cycle is determined as the output side moisture content response cycle. The number of delay cycles for gas passage is determined based on the periodic position difference between the output side water content response cycle and the inlet side water content change cycle.

[0006] A further technical improvement of the present invention is: a method for obtaining the preset response attribution gas volume, comprising: Read the historical records in the historical time-series periodic data chain that have recorded the pairing results of historical inbound side moisture content change cycle and historical outbound side moisture content response cycle, and extract the historical inbound side moisture content change cycle, historical outbound side moisture content response cycle and historical cycle gas volume. For each historical entry side moisture content change cycle, the historical cycle through gas volume is accumulated cycle by cycle starting from that historical entry side moisture content change cycle, and the corresponding historical cross detection cycle and historical cross remaining gas volume are formed according to the method for determining the cross detection cycle and cross remaining gas volume in claim 2. The remaining gas volume across the historical span is sorted in ascending order of numerical value to form a sequence of candidate response-assigned gas volumes. Each historical span remaining gas volume in the candidate response allocation gas volume sequence is taken as the candidate boundary gas volume, and the historical records with gas volumes less than the candidate boundary gas volume are assigned to the response of the next detection cycle, and the historical records with gas volumes greater than or equal to the candidate boundary gas volume are assigned to the response of the same detection cycle, so as to form the response allocation result corresponding to the candidate boundary gas volume. Compare the response attribution results corresponding to each candidate boundary gas volume with the historical output side water content response cycle pairing results, and count the number of inconsistent attribution records. The candidate boundary gas volume with the smallest number of inconsistent attribution records is selected as the preset response attribution gas volume.

[0007] A further technical improvement of the present invention is that the method for determining the direction of moisture content change by the occlusion recognition module includes: Along the time-series periodic data chain, read the continuous detection cycles before the entry-side cycle to be determined, forming a pre-entry stabilization segment; Based on the water content of the entry side in each detection cycle within the entry-side pre-stabilization section, a central reference value for the entry side is formed, and the maximum deviation of the water content of the entry side within the entry-side pre-stabilization section relative to the central reference value on the high side and the maximum deviation on the low side are calculated respectively. The upper boundary of stability on the entry side is formed by adding the maximum deviation on the higher side to the center reference value on the entry side, and the lower boundary of stability on the entry side is formed by subtracting the maximum deviation on the lower side from the center reference value on the entry side. When the water content on the entry side in the cycle to be determined and the subsequent preset number of adjacent detection cycles are all higher than the upper boundary of the entry side stability, the cycle to be determined is defined as the cycle in which the direction of increasing water content on the entry side has been formed; when the water content on the entry side in the cycle to be determined and the subsequent preset number of adjacent detection cycles are all lower than the lower boundary of the entry side stability, the cycle to be determined is defined as the cycle in which the direction of decreasing water content on the entry side has been formed. The output side pre-stabilization segment is formed based on the continuous detection cycle before the output side moisture content response cycle, and the output side stabilization upper boundary and output side stabilization lower boundary are formed based on the output side pre-stabilization segment; when the output side moisture content in the output side moisture content response cycle and its subsequent preset number of adjacent detection cycles does not form the same increasing or decreasing direction as the input side moisture content, it is determined that the output side moisture content does not form the same changing direction.

[0008] A further technical improvement of the present invention is that the method for determining the range of the leading-edge migration margin in the leading-edge propulsion module includes: When deducting the remaining carrying capacity of a section segment by segment based on the amount of water vapor blocked, the carrying capacity segment being deducted is identified as the current carrying capacity segment, and the remaining carrying capacity of the current carrying capacity segment is read. Read the amount of shading moisture that should be written to the current bearing segment according to the bearing segment sequence, and use it as the subsequent shading moisture amount; If the remaining carrying capacity of the current carrying section is greater than zero and less than the subsequent shading water vapor amount, the state of the remaining carrying capacity of the current carrying section is determined as entering the front migration margin range. Write the portion of the subsequent shading water vapor quantity that is equal to the remaining capacity of the current carrying segment into the current carrying segment, and write the portion of the remaining portion of the subsequent shading water vapor quantity after deducting this portion into the next carrying segment that does not exceed the remaining capacity of the segment before the next carrying segment receives the data into the next carrying segment. Based on the amount of shading water vapor received by the current bearing section and the amount of shading water vapor received by the next bearing section, a leading edge distribution relationship from the current bearing section to the next bearing section is formed.

[0009] A further technical improvement of the present invention is that the method by which the leading-edge propulsion module generates a water vapor leading-edge position record based on the leading-edge distribution relationship includes: Read the current carrying segment, the next carrying segment, the amount of shading water vapor received by the current carrying segment, and the amount of shading water vapor received by the next carrying segment in the front allocation relationship; The adjacent connection positions of the current bearing segment and the next bearing segment in the bearing segment sequence are determined as the basic front edge positions; Read the remaining capacity of the next carrying section before receiving the amount of shielded water vapor, and form the occupancy ratio of the next carrying section based on the proportion of the amount of shielded water vapor received by the next carrying section to the remaining capacity of the section. Based on the location of the basic front and the occupancy ratio of the subsequent bearing section, the relative position of the water vapor front within the subsequent bearing section is determined; Write the relative position of the water vapor front within the next bearing section, the current bearing section, the next bearing section, and the front allocation relationship into the water vapor front position record.

[0010] A further technical improvement of the present invention is that the method for the risk recording module to determine the subsequent preset quantity detection cycle includes: The remaining capacity of each carrying section between the water vapor front and the output side is read, and a remaining capacity distribution sequence is formed according to the order of each carrying section in the carrying section sequence; Write the incremental bearing segment positions for each bearing segment in the remaining bearing distribution sequence according to the direction from the water vapor front to the output side; Multiply the load-bearing segment ranking of each load-bearing segment by the remaining load capacity of that load-bearing segment to form the positional load capacity of the corresponding load-bearing segment, and determine the weighted ranking of the remaining load capacity by the ratio of the sum of the positional load capacity to the sum of the remaining load capacity of each segment. The bearing segment whose rank is not less than the weighted rank of the remaining bearing segment and whose difference from the weighted rank of the remaining bearing segment is the smallest is determined as the weighted rank of the remaining bearing segment; The number of bearing segments from the bearing segment where the water vapor front is located to the remaining bearing weighted segment is counted, and the subsequent preset quantity detection cycle is formed based on the number of bearing segments.

[0011] A further technical improvement of the present invention is that the method by which the attenuation judgment module determines the period by restoring the gas volume to a stable range includes: Read the start and end detection cycles of the low-traffic masking segment in the time-series periodic data chain, count the number of detection cycles contained between the start and end detection cycles, and form the masking cycle count. Along the time-series periodic data chain, read the same number of consecutive detection cycles as the number of occlusion cycles before the start detection cycle of the low-flow occlusion segment to form a reference cycle group before occlusion, and form a reference through gas volume sequence based on the periodic through gas volume of each detection cycle in the reference cycle group before occlusion. A reference gas volume range is formed based on the maximum and minimum values ​​of the periodic gas volume in the reference gas volume sequence. After recording the risk zone, read the same number of consecutive detection cycles as the number of shielding cycles in the order of detection cycles to form a recovery candidate cycle group, and form a recovery candidate gas volume sequence based on the gas volume of each detection cycle in the recovery candidate cycle group. The periodic through gas volume of adjacent detection cycles in the reference through gas volume sequence and the recovered candidate through gas volume sequence are subtracted to form the reference change direction sequence and the recovered change direction sequence; When the gas volume of each cycle in the candidate recovery gas volume sequence falls within the reference gas volume range, and the adjacent difference signs of the reference change direction sequence and the recovery change direction sequence are consistent at the same sequence position, the candidate recovery cycle group is determined as the cycle group whose cycle gas volume has recovered to the stable range, and the cycle gas volume range within the candidate recovery cycle group is determined as the stable range.

[0012] Compared with the prior art, the present invention has the following beneficial effects: This invention acquires data on the water content at the inlet side, the water content at the outlet side, and the flow rate status according to the detection cycle through a time-series data module, and forms a data chain of periodic gas flow and time-series cycle, so that the water content at the inlet side, the water content at the outlet side, and the periodic gas flow are established in a corresponding relationship under the same detection cycle caliber; the shielding identification module further determines the number of gas flow delay cycles based on the periodic gas flow and the effective gas path volume, and pairs the water content change cycle at the inlet side with the water content response cycle at the outlet side after the shift, so that when the water content change direction at the inlet side has been formed but the water content at the outlet side has not formed the same change direction, it can identify the low flow shielding section and record the shielding water vapor volume; Furthermore, this invention divides the drying medium into a sequence of carrying sections arranged along the direction of methane gas passage through a leading edge propulsion module, and deducts the remaining carrying capacity of each section segment by segment based on the amount of water vapor obscured. When the remaining carrying capacity of a section enters the range of the leading edge migration margin, the subsequent amount of water vapor obscured is written into the current carrying section and the next carrying section according to the leading edge distribution relationship, forming a water vapor leading edge position record. Therefore, the drying medium no longer participates in the judgment only as an overall adsorption component, but can record the water vapor leading edge propulsion state according to the carrying section sequence, so that the subsequent risk record can be judged based on the remaining carrying capacity of each carrying section between the water vapor leading edge and the output side. On the other hand, the present invention, through a risk recording module, compares the sum of the remaining load capacity of each load-bearing section between the water vapor front and the output side with the total water vapor input on the inlet side during subsequent preset number detection cycles when the output side moisture content does not exceed the allowable inlet moisture content, thus forming a risk section record. The attenuation judgment module further forms a verification window after the risk section record when the cycle through gas volume recovers to a stable range, and forms a hidden attenuation judgment result of the drying medium based on the cycle position relationship between the expected response cycle and the actual response cycle. Thus, it is possible to make an early judgment on the remaining load capacity of the drying medium when the output side moisture content has not exceeded the allowable inlet moisture content, thereby improving the stability of the pre-processing of methane gas before it enters the gas sensor. Attached Figure Description

[0013] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0014] Figure 1 This is a system block diagram of the present invention; Figure 2 This is a schematic diagram of the CCER methane gas drying and filtration pretreatment device in an embodiment of the present invention. Detailed Implementation

[0015] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0016] Please see Figure 1 As shown, this invention provides an integrated pretreatment system for high-efficiency purification and drying of methane gas in CCER pipelines, comprising: The time-series data module is used to acquire data on the moisture content of the inlet side, the moisture content of the outlet side, and the flow rate status according to the detection cycle, forming a cycle-through gas volume and time-series cycle data chain; Specifically, in this embodiment, the integrated pretreatment path for methane gas purification and drying is the gas path from the gas intake point of the pipeline, through which methane gas enters and undergoes purification and drying before reaching the gas sensor inlet. The time-series data module collects and organizes data in the integrated pretreatment path for methane gas purification and drying according to the detection cycle. Each detection cycle has a detection cycle identifier, a detection cycle start time, and a detection cycle end time. The detection cycle identifier increments sequentially according to the occurrence of the detection cycles, ensuring that the inlet-side moisture content, outlet-side moisture content, and flow rate status data generated within the same detection cycle have a unified time sequence.

[0017] The effective gas path volume is the internal volume of the gas path between the inlet-side data acquisition position and the outlet-side data acquisition position; wherein, the inlet-side data acquisition position is located before the methane gas enters the integrated pretreatment path for methane gas purification and drying, and the outlet-side data acquisition position is located after the methane gas leaves the integrated pretreatment path for methane gas purification and drying and before it enters the gas sensor.

[0018] Within each detection cycle, the time-series data module reads the humidity and temperature data on the inlet side before the methane gas enters the integrated pretreatment path for methane gas purification and drying. Based on these data, it calculates the inlet side moisture content using a moisture content conversion relationship. This conversion relationship is used to convert the humidity and temperature data to moisture content under the same metering caliber. The inlet side moisture content records the water vapor input status of the methane gas before it enters the integrated pretreatment path for methane gas within the current detection cycle and writes it under the current detection cycle identifier.

[0019] Within the same detection cycle, the time-series data module reads the output-side humidity and temperature data after the methane gas leaves the methane gas purification and drying integrated pretreatment path and before entering the gas sensor. Based on these data, it calculates the output-side moisture content using a conversion relationship consistent with the inlet-side moisture content. This consistent conversion ensures that the inlet-side and output-side moisture contents are measured under the same metering standard, supporting the pairing of subsequent inlet-side moisture content change cycles with the output-side moisture content response cycles. When the inlet-side data acquisition location directly outputs moisture content detection data, the time-series data module writes this data into the inlet-side moisture content. Conversely, when the output-side data acquisition location directly outputs moisture content detection data, the time-series data module writes this data into the output-side moisture content.

[0020] Within the same detection cycle, the time-series data module reads flow status data. This flow status data records the flow status of methane gas passing through the integrated methane gas purification and drying pretreatment pathway within the current detection cycle. Based on the flow status data and the detection cycle duration, the time-series data module generates the periodic throughput. When multiple flow rate acquisition values ​​are generated within a detection cycle, the time-series data module generates segmented throughput based on the time interval between adjacent acquisition times, and adds these segmented throughputs to form the periodic throughput for the current detection cycle. The periodic throughput records the actual amount of methane gas passing through the integrated methane gas purification and drying pretreatment pathway within the current detection cycle.

[0021] In this embodiment, the detection cycle duration is written before the time-series data module begins to form the time-series periodic data chain. The detection cycle duration is determined based on the sampling frequency of the inlet water content, the sampling frequency of the output water content, and the sampling frequency of the flow status data. When the sampling frequencies of the inlet water content, the output water content, and the flow status data are inconsistent, the longest sampling interval among the three is used as the detection cycle duration.

[0022] After generating the inlet-side moisture content, outlet-side moisture content, and cycle-through gas volume, the time-series data module writes the detection cycle identifier, detection cycle start time, detection cycle end time, inlet-side moisture content, outlet-side moisture content, flow rate status data, and cycle-through gas volume into the same detection cycle data unit. The detection cycle identifier, detection cycle start time, detection cycle end time, inlet-side moisture content, outlet-side moisture content, flow rate status data, and cycle-through gas volume written into the detection cycle data unit all correspond to the same detection cycle. This ensures that when subsequent cycles are read along the time-series cycle data chain, the inlet-side moisture content, outlet-side moisture content, and cycle-through gas volume corresponding to that detection cycle can be obtained simultaneously.

[0023] The time-series data module connects multiple detection cycle data units in ascending order of detection cycle identifiers to form a time-series cycle data chain. Adjacent detection cycle data units within the time-series cycle data chain have a sequential relationship, supporting the subsequent masking identification module in reading adjacent cycles, accumulating cycle-through gas volume, determining the number of gas passage delay cycles, and pairing the inlet-side moisture content change cycle with the outlet-side moisture content response cycle. After forming the time-series cycle data chain, the time-series data module verifies whether each detection cycle data unit contains inlet-side moisture content, outlet-side moisture content, flow status data, and cycle-through gas volume. If a detection cycle data unit lacks cycle-through gas volume, that detection cycle data unit is not used for subsequent calculations of the number of gas passage delay cycles.

[0024] The shielding identification module is used to read adjacent cycles along the time-series periodic data chain, determine the number of gas passage delay cycles based on the gas flow rate and effective gas path volume, pair the water content change cycle on the inlet side with the water content response cycle on the outlet side shifted according to the number of gas passage delay cycles, and determine a low flow shielding section when the water content change direction on the inlet side has been formed but the water content on the outlet side has not formed the same change direction, and record the amount of shielded water vapor. Specifically, in this embodiment, the water content on the inlet side and the water content on the outlet side read by the masking identification module are both expressed as the mass of water vapor per unit volume of methane gas. The periodic gas flow rate is expressed as the gas volume under the same temperature and pressure reference as the water content on the inlet side and the water content on the outlet side. Therefore, the water vapor input on the inlet side, formed by multiplying the water content on the inlet side by the periodic gas flow rate, is the mass of water vapor. The above measurement caliber remains consistent within the same time-series periodic data chain to ensure dimensional consistency when subsequently generating the masking water vapor quantity.

[0025] In this embodiment, the same temperature and pressure reference is used for the moisture content conversion relationship and the periodic gas flow calculation; the inlet moisture content, outlet moisture content and periodic gas flow are all converted according to the same temperature and pressure reference and then written into the timing periodic data chain.

[0026] Before identifying the current low-flow occlusion, the occlusion identification module reads historical records from the historical time-series periodic data chain, which already contain the pairing results of historical inbound moisture content change cycles and historical output moisture content response cycles. It then extracts the historical inbound moisture content change cycles, historical output moisture content response cycles, and historical cycle-through air volume. For each historical inbound moisture content change cycle, starting from that cycle, the historical cycle-through air volume is accumulated cycle by cycle along the historical time-series periodic data chain in ascending order of the detection cycle identifier. When the historical accumulated through air volume corresponding to the previous detection cycle is less than the effective gas path volume, and the historical accumulated through air volume corresponding to the current detection cycle is not less than the effective gas path volume, the current detection cycle is determined as a historical cross-detection cycle. The occlusion identification module uses the difference between the effective gas path volume and the historical accumulated through air volume before the historical cross-detection cycle as the air volume to be passed within the historical cross-detection cycle, and determines the difference between the historical cycle-through air volume of the historical cross-detection cycle and the air volume to be passed within the historical cross-detection cycle as the historical cross-detection remaining air volume.

[0027] The shading identification module sorts the historical remaining gas volume across historical spans from smallest to largest, forming a candidate response allocation sequence. Each historical remaining gas volume across historical spans in this sequence is then used as a candidate boundary gas volume. For each candidate boundary gas volume, the module assigns historical records smaller than the candidate boundary gas volume to the next detection cycle response, and historical records not smaller than the candidate boundary gas volume to the same detection cycle response, thus forming the response allocation result corresponding to the candidate boundary gas volume. The module then compares each response allocation result with the historical output side water content response cycle pairing result, counting the number of inconsistent allocation records. The shading identification module selects the candidate boundary gas volume with the smallest number of inconsistent allocation records as the preset response allocation gas volume. When multiple candidate boundary gas volumes have the same number of inconsistent allocation records, and both are the minimum value, if the number of candidate boundary gas volumes is odd, the candidate boundary gas volume in the middle of the sorted sequence is selected as the preset response allocation gas volume; if the number of candidate boundary gas volumes is even, the average of the two middle candidate boundary gas volumes is selected as the preset response allocation gas volume.

[0028] After establishing the preset response attribution gas volume, the shading identification module reads the continuous detection cycles preceding the entry-side cycle to be determined along the current time-series cycle data chain, forming an entry-side pre-stabilization segment. The shading identification module determines the arithmetic mean of the entry-side moisture content in each detection cycle within the entry-side pre-stabilization segment as the entry-side center reference value, and separately generates the maximum deviation on the high side and the maximum deviation on the low side of the entry side. The maximum deviation on the high side is formed by the maximum difference between the entry-side moisture content above the entry-side center reference value and the entry-side center reference value; the maximum deviation on the low side is formed by the maximum absolute value of the difference between the entry-side moisture content below the entry-side center reference value and the entry-side center reference value. The shading identification module forms the upper boundary of entry-side stability based on the entry-side center reference value plus the maximum deviation on the high side, and forms the lower boundary of entry-side stability based on the entry-side center reference value minus the maximum deviation on the low side.

[0029] For the inlet-side pre-stabilization section, when there is no inlet-side water content higher than the inlet-side center reference value within the inlet-side pre-stabilization section, the maximum deviation on the high side of the inlet side is determined to be zero; when there is no inlet-side water content lower than the inlet-side center reference value within the inlet-side pre-stabilization section, the maximum deviation on the low side of the inlet side is determined to be zero. For the outlet-side pre-stabilization section, when there is no outlet-side water content higher than the outlet-side center reference value within the outlet-side pre-stabilization section, the maximum deviation on the high side of the outlet side is determined to be zero; when there is no outlet-side water content lower than the outlet-side center reference value within the outlet-side pre-stabilization section, the maximum deviation on the low side of the outlet side is determined to be zero.

[0030] In this embodiment, the number of preset adjacent detection cycles is formed before the determination of the direction of change in water content on the inlet side. Specifically, the occlusion recognition module reads the duration required for direction confirmation and the detection cycle duration, divides the duration required for direction confirmation by the detection cycle duration, and rounds up the result to form the preset number of adjacent detection cycles; when the rounded result is less than one, the preset number of adjacent detection cycles is set to one. The duration required for direction confirmation is determined by the duration of water content change in historical stable operating data, the sampling frequency of water content on the inlet side, and the sampling frequency of water content on the output side. The preset number of adjacent detection cycles remains unchanged during the same low-flow occlusion recognition process and is used for determining the direction of change in water content on the inlet side, the direction of change in water content on the output side, and the actual response cycle.

[0031] When the water content on the entry side in the period to be determined and in the subsequent preset number of adjacent detection periods are all higher than the upper boundary of the entry side stability, the occlusion recognition module determines the period to be determined as a period in which the direction of increasing water content on the entry side has been formed. When the water content on the entry side in the period to be determined and in the subsequent preset number of adjacent detection periods are all lower than the lower boundary of the entry side stability, the occlusion recognition module determines the period to be determined as a period in which the direction of decreasing water content on the entry side has been formed. The determination of the direction of change in water content on the entry side is based on the upper boundary and the lower boundary of the entry side stability, and not on the difference in water content on the entry side between a single adjacent detection period.

[0032] After the direction of moisture content change on the inlet side has been established, the occlusion identification module uses the corresponding inlet side cycle to be determined as the inlet side moisture content change cycle, and uses the inlet side moisture content change cycle as the starting cycle for calculating the number of gas passage delay cycles. Starting from the calculation start cycle, the occlusion identification module accumulates the gas volume passing through each cycle in ascending order of the detection cycle identifier along the current time-series cycle data chain, forming a cumulative gas volume sequence. When the cumulative gas volume passing through the previous detection cycle is less than the effective gas path volume, and the cumulative gas volume passing through the current detection cycle is not less than the effective gas path volume, the current detection cycle is determined as a cross-detection cycle. The occlusion identification module uses the difference between the effective gas path volume and the cumulative gas volume passing through before the cross-detection cycle as the gas volume to be passed through within the cross-detection cycle, and determines the difference between the gas volume passing through the cross-detection cycle and the gas volume to be passed through within the cross-detection cycle as the remaining cross-detection gas volume. When the remaining gas volume after crossing reaches the preset response volume, the crossing detection cycle is determined as the output-side moisture content response cycle; when the remaining gas volume after crossing does not reach the preset response volume, the next detection cycle after the crossing detection cycle is determined as the output-side moisture content response cycle. The masking identification module determines the number of gas passage delay cycles based on the periodic position difference between the output-side moisture content response cycle and the inbound-side moisture content change cycle, and accordingly pairs the inbound-side moisture content change cycle with the output-side moisture content response cycle shifted backward according to the number of gas passage delay cycles.

[0033] After the input-side moisture content change cycle and the output-side moisture content response cycle are paired, the shading identification module reads the continuous detection cycles preceding the output-side moisture content response cycle along the current time-series cycle data chain, forming the output-side pre-stabilization segment. The shading identification module determines the arithmetic mean of the output-side moisture content in each detection cycle within the output-side pre-stabilization segment as the output-side center reference value. Based on the high-side and low-side deviations of each output-side moisture content relative to the output-side center reference value within the output-side pre-stabilization segment, it forms the output-side high-side maximum deviation and output-side low-side maximum deviation, respectively. The upper boundary of output-side stability is formed by adding the output-side center reference value to the output-side high-side maximum deviation, and the lower boundary of output-side stability is formed by subtracting the output-side low-side maximum deviation from the output-side center reference value.

[0034] The occlusion recognition module reads the output side moisture content during the output side moisture content response period and the subsequent preset number of adjacent detection periods. If the output side moisture content is not above the upper stable boundary of the output side during the output side moisture content response period and the subsequent preset number of adjacent detection periods when the increasing direction of the entering side moisture content has been formed, it is determined that the output side moisture content has not formed the same increasing direction as the entering side moisture content. If the output side moisture content is not below the lower stable boundary of the output side during the output side moisture content response period and the subsequent preset number of adjacent detection periods when the decreasing direction of the entering side moisture content has been formed, it is determined that the output side moisture content has not formed the same decreasing direction as the entering side moisture content.

[0035] When the direction of change in water content on the inlet side has been established, and the response period of water content on the output side, after being paired according to the number of gas passage delay cycles, does not show the same direction of change, the masking identification module determines the detection period range between the water content change period on the inlet side and the response period of water content on the output side as a low-flow masking segment. This determination result is formed by the combined directional response of the water content change direction on the inlet side, the number of gas passage delay cycles, and the response period of water content on the output side, rather than solely by the directional difference between the water content on the inlet side and the water content on the output side.

[0036] The shading identification module reads the inlet-side moisture content and periodic gas flow rate corresponding to each detection cycle within the low-flow shading section. It multiplies the inlet-side moisture content of each detection cycle by the periodic gas flow rate to form the inlet-side water vapor input for that cycle. The module then accumulates the inlet-side water vapor input for each detection cycle within the low-flow shading section to form the shading water vapor volume. The shading identification module writes the start and end detection cycles, the direction of change in inlet-side moisture content, the output-side moisture content response cycle, the number of gas flow delay cycles, and the shading water vapor volume into the low-flow shading section record. This allows the subsequent forward propulsion module to deduct the remaining capacity of the section segment by segment based on the shading water vapor volume.

[0037] The leading edge propulsion module is used to divide the drying medium into a sequence of carrying sections arranged along the direction of methane gas passage, and deduct the remaining carrying capacity of each section according to the amount of shading water vapor; when the remaining carrying capacity of a section enters the range of leading edge migration margin, the subsequent shading water vapor amount is written into the current carrying section and the next carrying section according to the leading edge distribution relationship, forming a water vapor leading edge position record. Specifically, in this embodiment, the leading-edge propulsion module reads the position range of the drying medium in the integrated pretreatment path for methane gas purification and drying, and divides this position range into multiple carrying sections according to the direction of methane gas flow. These carrying sections are arranged sequentially according to the direction of methane gas flow, forming a carrying section sequence. The leading-edge propulsion module reads the filling amount of the drying medium and the unit water absorption capacity of the drying medium for each carrying section, calculates the initial carrying capacity of each carrying section, and uses the initial carrying capacity as the remaining carrying capacity of the corresponding carrying section in the initial state. The remaining carrying capacity of the section and the amount of shading water vapor generated by the shading identification module use the same water vapor mass measurement caliber to support subsequent deduction processing.

[0038] Furthermore, in this embodiment, the preset segment length is formed before dividing the carrying segment sequence. The leading-edge propulsion module reads the effective filling length of the drying medium in the methane gas passage direction, the cross-sectional area of ​​the drying medium passage, and the periodic gas flow rate of a single detection cycle under stable operating conditions. The periodic gas flow rate of a single detection cycle under stable operating conditions is divided by the cross-sectional area of ​​the drying medium passage to form the single-cycle gas propulsion length. The result of dividing the effective filling length of the drying medium in the methane gas passage direction by the single-cycle gas propulsion length is rounded up to form the preset number of carrying segments. The effective filling length of the drying medium in the methane gas passage direction is divided by the preset number of carrying segments to form the preset segment length. Each carrying segment is divided sequentially along the methane gas passage direction according to the preset segment length. When the remaining length at the end is less than the preset segment length, the area corresponding to the remaining length at the end is taken as the end carrying segment.

[0039] The calibration test data includes the cumulative water vapor input when the drying medium reaches the state of rising output water content under the conditions of calibration inlet air moisture content, calibration cycle gas flow rate, and calibration temperature. The leading-edge propulsion module divides this cumulative water vapor input by the amount of drying medium used in the calibration to form the unit water absorption capacity of the drying medium. The initial capacity of a section is formed by multiplying the amount of drying medium filled in the corresponding capacity section by the unit water absorption capacity of the drying medium.

[0040] The leading-edge propulsion module reads the low-flow shielding segment record generated by the shielding identification module and extracts the shielding water vapor volume from it. Following the carrying segment sequence, starting from the carrying segment closest to the methane gas inlet side, the leading-edge propulsion module deducts the remaining carrying capacity of each segment segment based on the shielding water vapor volume. During the deduction process, the carrying segment being deducted is determined as the current carrying segment; the shielding water vapor volume that should be written to the current carrying segment according to the carrying segment sequence is determined as the subsequent shielding water vapor volume. When the current carrying segment is the first carrying segment, the subsequent shielding water vapor volume is the shielding water vapor volume in the low-flow shielding segment record; when the current carrying segment is not the first carrying segment, the subsequent shielding water vapor volume is the remaining shielding water vapor volume that was not fully written after being received from the previous carrying segment.

[0041] The leading-edge propulsion module reads the remaining capacity of the current carrying segment and compares it with the subsequent shading moisture volume. When the remaining capacity of the current carrying segment is greater than zero and less than the subsequent shading moisture volume, the current carrying segment can still receive some of the subsequent shading moisture volume, but cannot receive all of it alone. The leading-edge propulsion module determines the state of the remaining capacity of the current carrying segment as entering the leading-edge migration margin range. The leading-edge migration margin range is formed by the receiving relationship between the remaining capacity of the current carrying segment and the subsequent shading moisture volume, and is used to trigger the current carrying segment and the next carrying segment to jointly receive the same subsequent shading moisture volume.

[0042] After the current carrying segment enters the leading-edge migration margin range, the leading-edge propulsion module writes the portion of the subsequent shielding water vapor volume equal to the remaining carrying capacity of the current carrying segment into the current carrying segment, and deducts the remaining carrying capacity of the current carrying segment used for this writing. Subsequently, the leading-edge propulsion module uses the remaining portion of the subsequent shielding water vapor volume after deducting the portion received by the current carrying segment as the shielding water vapor volume to be written into the next carrying segment; wherein, the shielding water vapor volume written into the next carrying segment does not exceed the remaining carrying capacity of the segment before the next carrying segment is received. When the aforementioned remaining portion is greater than the remaining carrying capacity of the segment before the next carrying segment is received, the leading-edge propulsion module continues to process the remaining shielding water vapor volume not written into the next carrying segment along the carrying segment sequence as the subsequent shielding water vapor volume to be deducted segment by segment in the next round. This forms the shielding water vapor volume received by the current carrying segment and the shielding water vapor volume received by the next carrying segment.

[0043] The leading-edge propulsion module establishes a leading-edge allocation relationship from the current carrying segment to the next carrying segment based on the amount of shielding water vapor received in the current carrying segment and the amount of shielding water vapor received in the next carrying segment. This leading-edge allocation relationship records the current carrying segment, the next carrying segment, the amount of shielding water vapor received in the current carrying segment, the amount of shielding water vapor received in the next carrying segment, and the corresponding low-flow shielding segment. This leading-edge allocation relationship is used to represent the reception result of the same subsequent shielding water vapor amount between two adjacent carrying segments.

[0044] After establishing the frontal allocation relationship, the frontal propulsion module reads the current bearing segment, the next bearing segment, the amount of shading water vapor received by the current bearing segment, and the amount of shading water vapor received by the next bearing segment from the frontal allocation relationship. It then determines the adjacent connection position between the current and next bearing segments in the bearing segment sequence as the basic frontal position. The basic frontal position corresponds to the bearing handover position between the current and next bearing segments and serves as a positional reference when the water vapor front enters the next bearing segment.

[0045] The leading-edge propulsion module reads the remaining capacity of the subsequent carrying segment before receiving the amount of shielded water vapor, and calculates the occupancy ratio of the subsequent carrying segment based on the proportion of shielded water vapor received by the subsequent carrying segment to its remaining capacity. When the current carrying segment and the subsequent carrying segment jointly receive the same amount of subsequent shielded water vapor, the occupancy ratio of the subsequent carrying segment is greater than zero and not greater than one. Based on the position of the base leading edge and the occupancy ratio of the subsequent carrying segment, the leading-edge propulsion module determines the relative position of the water vapor leading edge within the subsequent carrying segment along the methane gas passage direction, so that the position of the water vapor leading edge reflects the relative degree of shielded water vapor occupation in the subsequent carrying segment. When the length of the subsequent carrying segment along the methane gas passage direction is a preset segment length, the occupancy ratio of the subsequent carrying segment is multiplied by the preset segment length to form the forward movement distance of the water vapor leading edge relative to the position of the base leading edge, and the relative position of the water vapor leading edge within the subsequent carrying segment is determined based on the position of the base leading edge and the forward movement distance.

[0046] The leading edge propulsion module writes the current carrying capacity segment, the next carrying capacity segment, the basic leading edge position, the occupancy ratio of the next carrying capacity segment, the relative position of the water vapor leading edge within the next carrying capacity segment, and the leading edge allocation relationship into the water vapor leading edge position record. The water vapor leading edge position record is used by the risk recording module to read the sum of the remaining carrying capacity of each carrying capacity segment between the water vapor leading edge and the output side.

[0047] The risk recording module is used to form a risk section record when the output side moisture content does not exceed the allowable inlet air moisture content, and the sum of the remaining capacity of each carrying section between the water vapor front and the output side is lower than the total amount of inlet side water vapor input in the subsequent preset number of detection cycles. Specifically, in this embodiment, the risk recording module reads the water vapor front position record generated by the front advancement module and determines the carrying section where the water vapor front is located and the carrying section range between the water vapor front and the output side based on the water vapor front position record. The carrying section range between the water vapor front and the output side refers to the carrying section covered from the carrying section where the water vapor front is located, along the direction of methane gas passage to the corresponding carrying section on the output side. The risk recording module reads the remaining carrying capacity of each carrying section within the above-mentioned carrying section range and arranges the remaining carrying capacity of each section according to the arrangement order of each carrying section in the carrying section sequence to form a remaining carrying capacity distribution sequence. The remaining carrying capacity distribution sequence is used to record the distribution position of the remaining carrying capacity of each carrying section between the water vapor front and the output side in the carrying section sequence.

[0048] After forming the remaining carrying capacity distribution sequence, the risk recording module writes an increasing carrying capacity segment position for each carrying capacity segment in the remaining carrying capacity distribution sequence, following the direction from the water vapor front to the output side. Following the direction from the water vapor front to the output side, each carrying capacity segment is sequentially written as the first position, second position, and so on until the last position. The risk recording module multiplies the carrying capacity segment position of each carrying capacity segment by the segment's remaining carrying capacity to form the corresponding carrying capacity segment's position carrying capacity, and sums all position carrying capacity values ​​to form the total position carrying capacity; simultaneously, it sums the segment remaining carrying capacity values ​​of each carrying capacity segment in the remaining carrying capacity distribution sequence to form the remaining path carrying capacity.

[0049] The risk recording module determines the weighted position of the remaining capacity by the ratio of the sum of the location capacity to the remaining path capacity. The weighted position of the remaining capacity is used to record the distribution of the remaining capacity in the capacity segment sequence between the water vapor front and the output side.

[0050] After determining the weighted position of the remaining load capacity, the risk recording module reads the load segment position of each load segment in the remaining load capacity distribution sequence and identifies the load segment whose position is not less than the weighted position of the remaining load capacity and has the smallest difference between the two positions as the weighted remaining load capacity segments. When the weighted remaining load capacity position is equal to the position of a certain load segment, that load segment is identified as the weighted remaining load capacity segment; when the weighted remaining load capacity position is between two adjacent load segment positions, the load segment with the later position is identified as the weighted remaining load capacity segment. Thus, the risk recording module converts the non-integer weighted remaining load capacity position into the actual load segments in the load segment sequence, ensuring clear segment boundaries when calculating the number of subsequent detection cycles.

[0051] The risk recording module counts the number of carrying segments from the carrying capacity segment where the water vapor front is located to the remaining weighted carrying capacity segment, and determines this number of carrying segments as the preset number of subsequent preset quantity detection cycles. The preset number of cycles in subsequent preset quantity detection cycles is formed before the risk segment record is determined, and is redefined each time a water vapor front position record is generated. Specifically, the risk recording module determines the carrying capacity segment where the water vapor front is located based on the water vapor front position record and reads the carrying capacity segment position of the water vapor front carrying capacity segment in the carrying capacity segment sequence; the risk recording module determines the remaining weighted carrying capacity segment based on the remaining carrying capacity distribution sequence and the remaining weighted carrying capacity position, and reads the carrying capacity segment position of the remaining weighted carrying capacity segment in the carrying capacity segment sequence; the carrying capacity segment position of the remaining weighted carrying capacity segment is subtracted from the carrying capacity segment position of the water vapor front carrying capacity segment, and then one is added to form the preset number of cycles for subsequent preset quantity detection cycles. When the carrying capacity segment where the water vapor front is located and the remaining weighted carrying capacity segment are the same carrying capacity segment, the preset number of cycles for subsequent preset quantity detection cycles is determined to be one. The risk recording module writes the preset number of cycles, the water vapor front position record, the remaining carrying capacity distribution sequence, the remaining carrying capacity weighted segment, and the detection cycle identifier corresponding to the formation of the preset number of cycles into the subsequent preset number of detection cycle fields. Then, the risk recording module determines the first detection cycle after the formation of the water vapor front position record as the starting detection cycle for the subsequent preset number of detection cycles, and reads continuous detection cycles from this starting detection cycle along the time-series periodic data chain. The number of continuous detection cycles read is the same as the preset number of cycles for the subsequent preset number of detection cycles. It also reads the ingress moisture content and periodic gas flow within the aforementioned continuous detection cycles. The risk recording module multiplies the ingress moisture content of each detection cycle by the periodic gas flow for that detection cycle to form the ingress moisture input for the corresponding detection cycle, and accumulates the ingress moisture input for each detection cycle within the aforementioned continuous detection cycles to form the total ingress moisture input. The total ingress moisture input uses the same moisture mass measurement caliber as the remaining path carrying capacity and is used for carrying capacity comparison before the formation of the risk segment record.

[0052] In this embodiment, the water content of the intake air is allowed to be the upper limit of the water content required by the gas sensor, and it is written into the risk record module according to the same metering caliber as the water content on the output side.

[0053] The risk recording module reads the output-side moisture content in the initial detection period of the subsequent preset quantity detection cycle and compares this output-side moisture content with the allowable inlet moisture content. When the output-side moisture content does not exceed the allowable inlet moisture content, and the remaining path carrying capacity is lower than the total inlet-side water vapor input corresponding to the subsequent preset quantity detection cycle, the risk recording module forms a risk segment record. The risk segment record includes data such as the carrying capacity segment where the water vapor front is located, the remaining carrying capacity distribution sequence, the remaining path carrying capacity, the weighted position of the remaining carrying capacity, the weighted segment of the remaining carrying capacity, the subsequent preset quantity detection cycle, the total inlet-side water vapor input, and the corresponding output-side moisture content; the risk segment record also includes a low-flow shielding segment record associated with the water vapor front location record, enabling the attenuation judgment module to read the start and end detection cycles of the corresponding low-flow shielding segment.

[0054] The attenuation judgment module is used to form a verification window after the period recovers to a stable range through gas volume after recording in the risk section; the detection period when the cumulative water vapor input first reaches the sum of the remaining carrying capacity of the section is taken as the expected response period, and the detection period when the output side water content changes from a stable state to an increasing state is taken as the actual response period; when the actual response period is the same as or adjacent to the expected response period, the implicit attenuation judgment result of the drying medium is formed. Specifically, in this embodiment, the attenuation judgment module performs verification judgment after the risk segment record is formed. The attenuation judgment module first reads the low-flow shielding segment corresponding to the risk segment record, and reads the start detection period and end detection period of the low-flow shielding segment along the time-series periodic data chain. It counts the number of detection periods contained between the start detection period and the end detection period to form the shielding period count. The shielding period count is used to limit the period length of the reference period group and the recovery candidate period group before subsequent shielding, so that the period before the formation of the low-flow shielding segment has the same time-series comparison scale through the gas volume state and the period after the risk segment record through the gas volume recovery state.

[0055] The attenuation judgment module reads a number of consecutive detection cycles equal to the number of detection cycles before the start of the low-flow shielding section along the time-series periodic data chain, forming a pre-shielding reference cycle group. It then reads the periodic gas flow rate of each detection cycle within this reference cycle group, arranging the flow rates in ascending order of the detection cycle identifier to form a reference flow rate sequence. The attenuation judgment module reads the maximum and minimum periodic flow rates from this sequence and defines the range between the minimum and maximum periodic flow rates as the reference flow rate range. This range is used to record the periodic flow rate fluctuation boundary corresponding to the methane gas flow state before the low-flow shielding section is formed.

[0056] After establishing the reference air volume range, the attenuation judgment module reads consecutive detection cycles equal to the number of shielding cycles along the time-series periodic data chain after the risk segment is recorded, in ascending order of the detection cycle identifier, forming a recovery candidate cycle group. It then reads the periodic air volume of each detection cycle within the recovery candidate cycle group and arranges the periodic air volumes in ascending order of the detection cycle identifier, forming a recovery candidate air volume sequence. The attenuation judgment module subtracts the periodic air volume of adjacent detection cycles in the reference air volume sequence and the recovery candidate air volume sequence, respectively, to form a reference change direction sequence and a recovery change direction sequence. Each position in the reference change direction sequence records the sign of the periodic air volume difference between adjacent detection cycles in the reference cycle group before shielding, and each position in the recovery change direction sequence records the sign of the periodic air volume difference between adjacent detection cycles in the recovery candidate cycle group. The periodic air volume difference sign includes a positive sign, a negative sign, and a zero sign.

[0057] When the gas volume of each cycle in the recovery candidate gas volume sequence falls within the reference gas volume range, and the adjacent difference signs of the reference change direction sequence and the recovery change direction sequence are consistent at the same sequence position, the attenuation judgment module determines the recovery candidate cycle group as the cycle group whose cycle gas volume has recovered to the stable range, and determines the cycle gas volume range within the recovery candidate cycle group as the stable range. The attenuation judgment module uses the starting detection cycle of the recovery candidate cycle group as the starting position of the verification window, and continues to read subsequent detection cycles along the time-series periodic data chain in ascending order of the detection cycle identifier to form the verification window; the verification window covers the detection cycle in which the cumulative water vapor input first reaches the remaining path carrying capacity, and the detection cycle used to determine whether the output side water content changes from a stable state to an increasing state. Through the above processing, the verification window is not directly triggered by a fixed flow threshold, but is jointly determined by the reference gas volume state before the formation of the low flow shielding section and the recovery candidate gas volume state after the risk section is recorded.

[0058] After the verification window is formed, the attenuation judgment module reads the ingress moisture content and periodic gas flow rate for each detection cycle within the verification window. It then multiplies the ingress moisture content by the periodic gas flow rate for each detection cycle to form the ingress moisture input for that cycle. The attenuation judgment module accumulates the ingress moisture input within the verification window cycle by cycle in ascending order of the detection cycle identifier, forming a cumulative moisture input sequence. The cumulative moisture input and the remaining path carrying capacity in the risk section record use the same moisture mass measurement caliber for subsequent determination of the expected response cycle.

[0059] The attenuation judgment module reads the remaining path capacity from the risk segment record. This remaining path capacity is the sum of the remaining capacity of each carrying segment between the water vapor front and the output side, and is used as the comparison benchmark for the expected response period. The attenuation judgment module reads the cumulative water vapor input sequence along the verification window in ascending order of the detection period identifier. When the cumulative water vapor input corresponding to a certain detection period first reaches the remaining path capacity, that detection period is determined as the expected response period. The expected response period is used to record the expected time position at which subsequent water vapor input on the input side advances to the output side according to the input state within the verification window, given that the risk segment record has already been formed.

[0060] After determining the expected response period, the attenuation judgment module reads the output side moisture content along the verification window and forms an output side moisture content sequence in ascending order of the detection period identifier. The attenuation judgment module reads a preset number of adjacent detection periods at the beginning of the verification window to form an output side stable reference segment; it forms an output side stable center value based on the output side moisture content of each detection period within the output side stable reference segment, and reads the maximum deviation of the output side moisture content within the output side stable reference segment from the output side stable center value. The upper boundary of the output side moisture content corresponding to the stable output state is formed by adding the output side stable center value to the maximum deviation. When there is no output side moisture content higher than the output side stable center value within the output side stable reference segment, the maximum deviation of the output side corresponding to the output side stable reference segment is set to zero.

[0061] The attenuation judgment module continues to read the detection cycle after the stable reference segment on the output side along the output side moisture content sequence. When the output side moisture content in a certain detection cycle and its subsequent preset number of adjacent detection cycles is higher than the upper boundary of the output side moisture content corresponding to the stable state on the output side, the detection cycle is determined as the actual response cycle. The actual response cycle is used to record the actual time position when the output side moisture content changes from a stable state to an increasing state.

[0062] The attenuation judgment module compares the actual response period with the expected response period. When the actual response period and the expected response period are the same detection period, or when the actual response period is the preceding or following detection period of the expected response period, the attenuation judgment module generates a latent attenuation judgment result for the drying medium. The latent attenuation judgment result for the drying medium is written into the corresponding risk section record, stability range, verification window, expected response period, actual response period, and the periodic position relationship between the actual response period and the expected response period, which is used to record the latent attenuation status of the drying medium corresponding to the risk section record.

[0063] Implementation Cases Please see the appendix Figure 2Methane gas enters through the pipeline intake point, passes sequentially through an oil-water separator 1 and a silica gel drying cylinder 2, and then enters a laser methane sensor 4 after purification and drying. The oil-water separator 1 is used for pre-separation of liquid water and oily impurities in the methane gas; the silica gel drying cylinder 2 is used for adsorption and drying of water vapor in the methane gas; the flow meter 3 is used to generate flow status data; and the laser methane sensor 4 is used to detect the pre-treated methane gas. The data acquisition point on the inlet side is set before the oil-water separator 1, and the data acquisition point on the output side is set after the silica gel drying cylinder 2 and before the laser methane sensor 4. The internal volume of the passage between the inlet-side data acquisition point and the output-side data acquisition point forms the effective gas path volume.

[0064] The time-series data module reads the inlet moisture content, outlet moisture content, and flow status data according to the detection cycle. The inlet moisture content records the water vapor input state of methane gas before it enters the oil-water separator 1 and the silica gel drying cylinder 2, while the outlet moisture content records the water vapor output state of methane gas after it has been processed by the silica gel drying cylinder 2. The flow meter 3 generates flow status data within the same detection cycle. The time-series data module generates the periodic gas flow rate based on the flow status data and the detection cycle duration, and writes the detection cycle identifier, inlet moisture content, outlet moisture content, flow status data, and periodic gas flow rate into the detection cycle data unit. Then, a time-series periodic data chain is formed according to the increasing order of the detection cycle identifier.

[0065] The masking identification module reads adjacent cycles along the time-series periodic data chain, determines the number of gas passage delay cycles based on the cycle-through gas volume and effective gas path volume, and pairs the inlet-side moisture content change cycle with the output-side moisture content response cycle shifted according to the gas passage delay cycle number. When the inlet-side moisture content change direction has been formed, but the output-side moisture content in the output-side response cycle and its subsequent adjacent detection cycles does not form the same change direction, the masking identification module determines the corresponding detection cycle range as a low-flow masking segment, and accumulates the masking water vapor volume based on the inlet-side moisture content and cycle-through gas volume in each detection cycle within the low-flow masking segment.

[0066] The leading-edge propulsion module uses the silica gel drying cylinder 2 as the main carrier of the drying medium and divides the silica gel drying cylinder 2 into multiple carrier segments according to the direction of methane gas flow, forming a sequence of carrier segments. The leading-edge propulsion module determines the initial carrier capacity of each carrier segment based on the amount of silica gel filling and the unit water absorption capacity, and uses the initial carrier capacity as the remaining carrier capacity of the corresponding carrier segment. After the leading-edge propulsion module reads the amount of shading water vapor, it deducts the remaining carrier capacity of each carrier segment starting from the carrier segment closest to the methane gas entry side. When the remaining carrier capacity of the current carrier segment is greater than zero and less than the amount of subsequent shading water vapor, it determines that the current carrier segment has entered the leading-edge migration margin range, and writes the amount of subsequent shading water vapor into the current carrier segment and the next carrier segment according to the leading-edge distribution relationship, forming a water vapor leading-edge position record.

[0067] The risk recording module reads the water vapor front position record to determine the carrying capacity section where the water vapor front is located and the carrying capacity section range between the water vapor front and the output side. It then reads the remaining carrying capacity of each carrying capacity section within this range to form the remaining path carrying capacity. Based on the remaining carrying capacity of each carrying capacity section and its corresponding carrying capacity section position, the risk recording module generates a weighted position for the remaining carrying capacity and determines the weighted section for the remaining carrying capacity. Subsequently, the risk recording module subtracts the carrying capacity section position of the water vapor front from the carrying capacity section position of the weighted section for the remaining carrying capacity and adds one to form the preset number of detection cycles for subsequent preset number of detection cycles, and accumulates the total water vapor input on the inlet side corresponding to the subsequent preset number of detection cycles. When the output side moisture content does not exceed the allowable inlet moisture content, and the remaining path carrying capacity is lower than the total water vapor input on the inlet side corresponding to the subsequent preset number of detection cycles, a risk section record is generated.

[0068] The attenuation judgment module performs verification judgment after the risk section record is formed. Based on the periodic through gas volume status before the low-flow shielding section is formed and the periodic through gas volume status after the risk section record, the attenuation judgment module determines whether the periodic through gas volume has recovered to a stable range; when the periodic through gas volume recovers to a stable range, a verification window is formed. Within the verification window, the attenuation judgment module accumulates the incoming side water vapor input, and determines the detection period when the accumulated incoming side water vapor input first reaches the remaining path capacity as the expected response period; simultaneously, it reads the output side moisture content, and determines the detection period when the output side moisture content changes from a stable state to an increasing state as the actual response period. When the actual response period is the same as the expected response period, or when the actual response period is the previous or next detection period of the expected response period, a latent attenuation judgment result for the drying medium is formed. Therefore, the oil-water separator 1, silica gel drying cylinder 2, flow meter 3, and laser methane sensor 4 together constitute the structural basis of the integrated pretreatment device for methane gas purification and drying, and form a corresponding relationship with the time-series data, shielding identification, leading edge propulsion, risk recording, and attenuation judgment process.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-efficiency purification, drying, and integrated pretreatment system for methane gas in a CCER pipeline, characterized in that, include: The time-series data module is used to acquire data on the moisture content of the inlet side, the moisture content of the outlet side, and the flow rate status according to the detection cycle, forming a cycle-through gas volume and time-series cycle data chain; The shielding identification module is used to read adjacent cycles along the time-series periodic data chain, determine the number of gas passage delay cycles based on the gas flow rate and effective gas path volume, pair the water content change cycle on the inlet side with the water content response cycle on the outlet side shifted according to the number of gas passage delay cycles, and determine a low flow shielding section when the water content change direction on the inlet side has been formed but the water content on the outlet side has not formed the same change direction, and record the amount of shielded water vapor. The leading edge propulsion module is used to divide the drying medium into a sequence of carrying sections arranged along the direction of methane gas passage, and deduct the remaining carrying capacity of each section according to the amount of shading water vapor; when the remaining carrying capacity of a section enters the range of leading edge migration margin, the subsequent shading water vapor amount is written into the current carrying section and the next carrying section according to the leading edge distribution relationship, forming a water vapor leading edge position record. The risk recording module is used to form a risk section record when the output side moisture content does not exceed the allowable inlet air moisture content, and the sum of the remaining capacity of each carrying section between the water vapor front and the output side is lower than the total amount of inlet side water vapor input in the subsequent preset number of detection cycles. The attenuation judgment module is used to form a verification window after the cycle recovers to a stable range through gas volume after recording in the risk section; The detection period when the cumulative water vapor input first reaches the sum of the remaining carrying capacity of the section is taken as the expected response period, and the detection period when the output side water content changes from a stable state to an increasing state is taken as the actual response period; when the actual response period is the same as or adjacent to the expected response period, the implicit attenuation judgment result of the drying medium is formed.

2. The integrated pretreatment system for high-efficiency purification and drying of methane gas in a CCER pipeline according to claim 1, characterized in that, The methods used by the masking recognition module to determine the number of delay cycles for gas passage include: Read the cycle of water content change on the inlet side and use the cycle of water content change on the inlet side as the starting cycle for calculating the number of delay cycles for gas passage; Starting from the calculation start period, the gas volume passing through the period is accumulated cycle by cycle along the time-series period data chain in ascending order of the detection period identifier, forming a cumulative gas volume sequence; When the cumulative gas volume of the previous detection cycle is less than the effective gas path volume, and the cumulative gas volume of the current detection cycle is not less than the effective gas path volume, the current detection cycle is defined as a cross-detection cycle. The difference between the effective gas path volume and the cumulative gas volume before crossing the detection cycle is taken as the gas volume to be passed within the crossing detection cycle, and the difference between the periodic gas volume across the detection cycle and the gas volume to be passed within the crossing detection cycle is determined as the remaining gas volume for crossing. When the remaining gas volume reaches the preset response assigned gas volume, the crossing detection cycle is determined as the output side moisture content response cycle; when the remaining gas volume does not reach the preset response assigned gas volume, the next detection cycle of the crossing detection cycle is determined as the output side moisture content response cycle. The number of delay cycles for gas passage is determined based on the periodic position difference between the output side water content response cycle and the inlet side water content change cycle.

3. The integrated pretreatment system for high-efficiency purification and drying of methane gas in a CCER pipeline according to claim 2, characterized in that, The preset method for obtaining the assigned gas volume of the response includes: Read the historical records in the historical time-series periodic data chain that have recorded the pairing results of historical inbound side moisture content change cycle and historical outbound side moisture content response cycle, and extract the historical inbound side moisture content change cycle, historical outbound side moisture content response cycle and historical cycle gas volume. For each historical entry side moisture content change cycle, the historical cycle through gas volume is accumulated cycle by cycle starting from that historical entry side moisture content change cycle, and the corresponding historical cross detection cycle and historical cross remaining gas volume are formed according to the method for determining the cross detection cycle and cross remaining gas volume in claim 2. The remaining gas volume across the historical span is sorted in ascending order of numerical value to form a sequence of candidate response-assigned gas volumes. Each historical span remaining gas volume in the candidate response allocation gas volume sequence is taken as the candidate boundary gas volume, and the historical records with gas volumes less than the candidate boundary gas volume are assigned to the response of the next detection cycle, and the historical records with gas volumes greater than or equal to the candidate boundary gas volume are assigned to the response of the same detection cycle, so as to form the response allocation result corresponding to the candidate boundary gas volume. Compare the response attribution results corresponding to each candidate boundary gas volume with the historical output side water content response cycle pairing results, and count the number of inconsistent attribution records. The candidate boundary gas volume with the smallest number of inconsistent attribution records is selected as the preset response attribution gas volume.

4. The integrated pretreatment system for high-efficiency purification and drying of methane gas in a CCER pipeline according to claim 1, characterized in that, The method for determining the direction of moisture content change using a masking detection module includes: Read the continuous detection cycles before the entry side cycle to be determined along the time-series periodic data chain to form an entry side pre-stabilization segment, and form the entry side center reference value, the maximum deviation of the high side of the entry side, the maximum deviation of the low side of the entry side, the upper boundary of the entry side stabilization and the lower boundary of the entry side stabilization based on the water content of the entry side in the entry side pre-stabilization segment; When the water content on the entry side in the cycle to be determined and in the subsequent preset number of adjacent detection cycles is higher than the upper boundary of the entry side stability, it is determined that the direction of increasing water content on the entry side has been formed; when the water content on the entry side in the cycle to be determined and in the subsequent preset number of adjacent detection cycles is lower than the lower boundary of the entry side stability, it is determined that the direction of decreasing water content on the entry side has been formed. Read the continuous detection cycles before the output side water content response cycle along the time-series periodic data chain to form the output side pre-stabilization segment, and form the output side stabilization upper boundary and output side stabilization lower boundary; When the output side moisture content does not form the same increasing or decreasing direction as the input side moisture content in the output side moisture content response cycle and its subsequent preset number of adjacent detection cycles, it is determined that the output side moisture content does not form the same changing direction.

5. The integrated pretreatment system for high-efficiency purification and drying of methane gas in a CCER pipeline according to claim 1, characterized in that, The methods for determining the range of front migration margin in the front propulsion module include: When deducting the remaining carrying capacity of a section segment by segment based on the amount of water vapor blocked, the carrying capacity segment being deducted is identified as the current carrying capacity segment, and the remaining carrying capacity of the current carrying capacity segment is read. Read the amount of shading moisture that should be written to the current bearing segment according to the bearing segment sequence, and use it as the subsequent shading moisture amount; If the remaining carrying capacity of the current carrying section is greater than zero and less than the subsequent shading water vapor amount, the state of the remaining carrying capacity of the current carrying section is determined as entering the front migration margin range. Write the portion of the subsequent shading water vapor quantity that is equal to the remaining capacity of the current carrying segment into the current carrying segment, and write the portion of the remaining portion of the subsequent shading water vapor quantity after deducting this portion into the next carrying segment that does not exceed the remaining capacity of the segment before the next carrying segment receives the data into the next carrying segment. Based on the amount of shading water vapor received by the current bearing section and the amount of shading water vapor received by the next bearing section, a leading edge distribution relationship from the current bearing section to the next bearing section is formed.

6. The integrated pretreatment system for high-efficiency purification and drying of methane gas in a CCER pipeline according to claim 5, characterized in that, The methods used by the leading-edge propulsion module to generate water vapor leading-edge position records based on leading-edge distribution relationships include: Read the current carrying segment, the next carrying segment, the amount of shading water vapor received by the current carrying segment, and the amount of shading water vapor received by the next carrying segment in the front allocation relationship; The adjacent connection positions of the current bearing segment and the next bearing segment in the bearing segment sequence are determined as the basic front edge positions; Read the remaining capacity of the next carrying section before receiving the amount of shielded water vapor, and form the occupancy ratio of the next carrying section based on the proportion of the amount of shielded water vapor received by the next carrying section to the remaining capacity of the section. Based on the location of the basic front and the occupancy ratio of the subsequent bearing section, the relative position of the water vapor front within the subsequent bearing section is determined; Write the relative position of the water vapor front within the next bearing section, the current bearing section, the next bearing section, and the front allocation relationship into the water vapor front position record.

7. The integrated pretreatment system for high-efficiency purification and drying of methane gas in a CCER pipeline according to claim 1, characterized in that, The risk recording module determines the subsequent preset quantity detection cycle using the following methods: The remaining capacity of each carrying section between the water vapor front and the output side is read, and a remaining capacity distribution sequence is formed according to the order of each carrying section in the carrying section sequence; Write the incremental bearing segment positions for each bearing segment in the remaining bearing distribution sequence according to the direction from the water vapor front to the output side; Multiply the load-bearing segment ranking of each load-bearing segment by the remaining load capacity of that load-bearing segment to form the positional load capacity of the corresponding load-bearing segment, and determine the weighted ranking of the remaining load capacity by the ratio of the sum of the positional load capacity to the sum of the remaining load capacity of each segment. The bearing segment whose rank is not less than the weighted rank of the remaining bearing segment and whose difference from the weighted rank of the remaining bearing segment is the smallest is determined as the weighted rank of the remaining bearing segment; The number of bearing segments from the bearing segment where the water vapor front is located to the remaining bearing weighted segment is counted, and the subsequent preset quantity detection cycle is formed based on the number of bearing segments.

8. The integrated pretreatment system for high-efficiency purification and drying of methane gas in a CCER pipeline according to claim 1, characterized in that, The attenuation judgment module determines the cycle by restoring the gas volume to a stable range using the following methods: Read the start and end detection cycles of the low-traffic masking segment in the time-series periodic data chain, count the number of detection cycles contained between the start and end detection cycles, and form the masking cycle count. Along the time-series periodic data chain, read the same number of consecutive detection cycles as the number of occlusion cycles before the start detection cycle of the low-flow occlusion segment to form a reference cycle group before occlusion, and form a reference through gas volume sequence based on the periodic through gas volume of each detection cycle in the reference cycle group before occlusion. A reference gas volume range is formed based on the maximum and minimum values ​​of the periodic gas volume in the reference gas volume sequence. After recording the risk zone, read the same number of consecutive detection cycles as the number of shielding cycles in the order of detection cycles to form a recovery candidate cycle group, and form a recovery candidate gas volume sequence based on the gas volume of each detection cycle in the recovery candidate cycle group. The periodic through gas volume of adjacent detection cycles in the reference through gas volume sequence and the recovered candidate through gas volume sequence are subtracted to form the reference change direction sequence and the recovered change direction sequence; When the gas volume of each cycle in the candidate recovery gas volume sequence falls within the reference gas volume range, and the adjacent difference signs of the reference change direction sequence and the recovery change direction sequence are consistent at the same sequence position, the candidate recovery cycle group is determined as the cycle group whose cycle gas volume has recovered to the stable range, and the cycle gas volume range within the candidate recovery cycle group is determined as the stable range.

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