CN-121993745-A - High-flow gas diversion decompression temperature compensation control method and system

CN121993745ACN 121993745 ACN121993745 ACN 121993745ACN-121993745-A

Abstract

The application provides a high-flow gas split-flow decompression temperature compensation control method and a system, and relates to the technical field of temperature control, wherein a decompression section is divided into a front-stage heating zone and a rear-stage heating zone, and a heating unit is configured to acquire decompression working condition parameters, a front-stage section temperature and an output end gas temperature; determining a first compensation requirement for maintaining the front stage above a protection temperature according to the pressure-reducing working condition parameter and the front stage section temperature, determining a second compensation requirement for enabling the output temperature to reach a target value according to the pressure-reducing working condition parameter and the output gas temperature, and respectively determining the front stage target heating power and the rear stage target heating power according to the first compensation requirement and the second compensation requirement and controlling the operation of each heating unit. The application sets the compensation targets of two different properties of antifreezing protection and process standard reaching for the front stage and the rear stage, and considers the safety of the cold concentration area and the control precision of the temperature of the output end.

Inventors

SHEN DAN
ZHU YAOKUN
ZOU JIZHONG
SHANG HUA
Huang xiyan

Assignees

正帆科技(湖州)有限公司

Dates

Publication Date: 20260508
Application Date: 20260408

Claims (10)

1. The high-flow gas split-flow decompression temperature compensation control method is characterized by comprising the following steps of: Dividing a depressurization section in a gas depressurization conveying path into at least two segmented heating zones, wherein the segmented heating zones comprise at least one front-stage heating zone and at least one rear-stage heating zone, and a heating unit is configured for each segmented heating zone; Acquiring decompression working condition parameters and temperature detection data of the decompression section, wherein the temperature detection data comprise section temperature of the front-stage heating zone and output gas temperature of an output end of the decompression section; Determining a first compensation requirement for maintaining the forehearth heating zone above a preset forehearth protection temperature according to the depressurization working condition parameter and the zone temperature of the forehearth heating zone, and determining a second compensation requirement for enabling the output gas temperature of the output end of the depressurization zone to reach the preset output target temperature according to the depressurization working condition parameter, the output gas temperature and the preset output target temperature; Determining a front-stage target heating power according to the first compensation requirement, and determining a rear-stage target heating power according to the second compensation requirement; and controlling each heating unit to perform sectional heating on the pressure reducing section according to the corresponding target heating power.
2. The method of claim 1, wherein the pre-stage heating zone comprises at least one staged heating zone located within a preset distance range downstream of a pressure relief valve, the post-stage heating zone comprises at least one staged heating zone located outside the preset distance range and proximate to an output of the pressure relief section, and the preset pre-stage protection temperature is less than the preset output target temperature.
3. The method of claim 1 or 2, wherein the reduced pressure operating parameters include an inlet pressure, a reduced pressure, and a gas flow, and wherein the determining a first compensation requirement for maintaining the foreheating zone above a preset foreprotection temperature comprises: Acquiring the temperature of the gas before decompression; determining a pressure drop value based on the inlet pressure and the post-depressurization pressure; Determining a predicted temperature after depressurization according to the pressure drop value, a preset Joule-Thomson coefficient and the gas temperature before depressurization; And determining the first compensation requirement according to a first temperature difference value between the reduced predicted temperature and the preset pre-stage protection temperature and the gas flow.
4. The method of claim 2, wherein the predetermined distance range is determined from a post-depressurization temperature recovery gradient, comprising: Acquiring section temperatures of at least two position points along the downstream direction of the pressure reducing valve; determining a position, where the temperature recovery slope falls below a preset slope threshold, as a cold energy attenuation boundary according to the temperature recovery slope between the at least two position points; The segmented heating zone located upstream of the significant reduction in cold energy boundary is determined as a preceding stage heating zone, and the segmented heating zone located downstream of the significant reduction in cold energy boundary is determined as a succeeding stage heating zone.
5. The method of claim 1, wherein said determining a pre-stage target heating power based on said first compensation demand and a post-stage target heating power based on said second compensation demand comprises: acquiring a distance parameter between each segmented heating zone and a pressure reducing valve and a heat loss characteristic parameter corresponding to each segmented heating zone; Determining the compensation priority of each segmented heating zone according to the distance parameter and the heat loss characteristic parameter; When the front-stage heating zone comprises a plurality of section heating zones, distributing the front-stage target heating power according to the compensation priority of each front-stage section heating zone to obtain the target heating power corresponding to each front-stage section heating zone; And under the condition that the rear-stage heating zone comprises a plurality of sectional heating zones, distributing the rear-stage target heating power according to the compensation priority of each rear-stage heating zone to obtain the target heating power corresponding to each rear-stage heating zone.
6. The method as recited in claim 1, further comprising: updating the first compensation demand and the second compensation demand based on the updated and acquired depressurization condition parameters, the section temperature of the forestage heating zone, and the output gas temperature; and updating the front-stage target heating power and the rear-stage target heating power according to the updated first compensation requirement and second compensation requirement.
7. The method of claim 1, wherein in response to the sum of the pre-stage target heating power and the post-stage target heating power exceeding a preset available compensation power, the pre-stage target heating power is preferentially met and the post-stage target heating power is determined based on remaining available compensation power.
8. The method of claim 5, wherein said determining a compensation priority for each of said segmented heating zones comprises: determining a cold source proximity index corresponding to each segmented heating zone according to the distance parameter between each segmented heating zone and the pressure reducing valve; Determining local heat dissipation concentration indexes corresponding to the segmented heating zones according to the number of valves, the number of connectors, the number of flanges and the outer surface area in the segmented heating zones; Determining thermal inertia response indexes corresponding to the segmented heating zones according to the length and the heat transfer efficiency parameters of the segmented heating zones; And determining the compensation priority of each sectional heating area according to the cold source proximity index, the local heat dissipation concentration index and the thermal inertia response index.
9. The method of claim 8, wherein determining a local heat dissipation concentration indicator for each of the segmented heating zones comprises: Identifying a localized interface member corresponding to the valve, joint and flange in each of the segmented heating zones; Determining an interface heat dissipation contribution value corresponding to each local interface member according to the exposed metal area of each local interface member, the connection area with the main pipeline and the number of sealing interfaces; Determining the interface heat dissipation density of each segmented heating zone according to the sum of the interface heat dissipation contribution values in each segmented heating zone and the length of the corresponding segment; And determining local heat dissipation concentration indexes corresponding to the segmented heating zones according to the interface heat dissipation density and the outer surface area of the segmented heating zones.
10. A high flow gas split pressure reducing temperature compensating control system, comprising: A first processing module for dividing a depressurization segment in a gas depressurization conveying path into at least two segmented heating zones, wherein the segmented heating zones comprise at least one preceding stage heating zone and at least one subsequent stage heating zone, and a heating unit is configured for each segmented heating zone; the acquisition module is used for acquiring the pressure reduction working condition parameters of the pressure reduction section and temperature detection data, wherein the temperature detection data comprise the section temperature of the front-stage heating zone and the output gas temperature of the output end of the pressure reduction section; The second processing module is used for determining a first compensation requirement for maintaining the front-stage heating zone above a preset front-stage protection temperature according to the pressure-reducing working condition parameter and the section temperature of the front-stage heating zone; The control module is used for determining the front-stage target heating power according to the first compensation requirement and determining the rear-stage target heating power according to the second compensation requirement, and controlling each heating unit to perform sectional heating on the pressure reducing section according to the corresponding target heating power.

Description

High-flow gas diversion decompression temperature compensation control method and system Technical Field The application relates to the technical field of temperature control, in particular to a high-flow gas diversion decompression temperature compensation control method and system. Background In the process of conveying special gases such as silane, the gases are usually required to be conveyed to a downstream gas end after being depressurized by a pressure reducing valve. In the prior art, in order to reduce the influence of temperature drop after decompression on conveying stability, a heating device is generally arranged on a decompression valve body and/or a pipeline after decompression, and industrial monitoring scheduling software or a data acquisition and monitoring control system is combined to acquire and monitor parameters such as pressure, flow, temperature and the like, so that heating control is implemented on the basis. However, most of the existing schemes are developed around a whole heating or single temperature target, the pressure reducing section is usually used as a unified controlled object to be regulated, and distinguishing treatment of a local cold concentration area and output end temperature control requirements in the pressure reducing process is not needed. In actual operation, only the integral heat compensation or single measuring point feedback is relied on, and the antifreezing protection of a local cold concentration area and the accurate standard control of the gas temperature at the output end are difficult to be simultaneously considered, so that the operation safety of the system is influenced, the heat compensation is not reasonable enough, and the energy utilization efficiency is reduced. Therefore, a new sectional heating control scheme of the gas decompression section is still necessary to be provided so as to effectively consider the antifreezing protection of the local cold concentration area in the decompression process and the accurate standard control of the gas temperature at the output end, and simultaneously improve the operation safety and the energy utilization efficiency of the system. Disclosure of Invention Aiming at the defects of the prior art, the application provides a high-flow gas diversion decompression temperature compensation control method and a system. In a first aspect, the present application provides a method for controlling high-flow gas split pressure-reducing temperature compensation, including: Dividing a depressurization section in a gas depressurization conveying path into at least two segmented heating zones, wherein the segmented heating zones comprise at least one front-stage heating zone and at least one rear-stage heating zone, and a heating unit is configured for each segmented heating zone; Acquiring decompression working condition parameters and temperature detection data of the decompression section, wherein the temperature detection data comprise section temperature of the front-stage heating zone and output gas temperature of an output end of the decompression section; Determining a first compensation requirement for maintaining the forehearth heating zone above a preset forehearth protection temperature according to the depressurization working condition parameter and the zone temperature of the forehearth heating zone, and determining a second compensation requirement for enabling the output gas temperature of the output end of the depressurization zone to reach the preset output target temperature according to the depressurization working condition parameter, the output gas temperature and the preset output target temperature; Determining a front-stage target heating power according to the first compensation requirement, and determining a rear-stage target heating power according to the second compensation requirement; and controlling each heating unit to perform sectional heating on the pressure reducing section according to the corresponding target heating power. Optionally, the pre-stage heating zone comprises at least one segmented heating zone located within a preset distance range downstream of the pressure reducing valve, the post-stage heating zone comprises at least one segmented heating zone located outside the preset distance range and close to the output end of the pressure reducing section, and the preset pre-stage protection temperature is smaller than the preset output target temperature. Optionally, the pressure-reducing working condition parameters include inlet pressure, pressure after pressure reduction and gas flow, and the determining a first compensation requirement for maintaining the foreheating zone above a preset foreprotection temperature includes: Acquiring the temperature of the gas before decompression; determining a pressure drop value based on the inlet pressure and the post-depressurization pressure; Determining a predicted temperature after depressurization according to the pressure d