CN210462479U

CN210462479U - Gas pipeline conveying system with control system

Info

Publication number: CN210462479U
Application number: CN201920294850.5U
Authority: CN
Inventors: 关鸿鹏; 肖勇; 黄冬虹; 王振武; 翟楠希; 董新利; 伍清晔
Original assignee: Beijing Gas Group Co Ltd
Current assignee: Beijing Gas Group Co Ltd
Priority date: 2019-03-08
Filing date: 2019-03-08
Publication date: 2020-05-05
Anticipated expiration: 2029-03-08

Abstract

The utility model relates to a gas pipeline conveying system with control system, including header one, header two and a plurality of return circuit pipelines that set up between the outflow of header one and the inflow of header two to and PLC unit and human-computer interaction unit. A manual valve, a flowmeter and a loop control valve are sequentially arranged on the loop pipeline; the PLC unit comprises a CPU and an I/O module, and the I/O module is used for acquiring the operating parameters of the gas pipeline conveying system and adjusting the valve; the human-computer interaction unit comprises a display unit, an input unit and an alarm device; the I/O module of the PLC unit is connected with the valve and the flowmeter, and the human-computer interaction unit is connected with the CPU of the PCL unit. The utility model discloses guarantee the precision and the accuracy of measurement, the flowmeter is crossed gas and is not measured when preventing to break the flowmeter when large-traffic and little flow, has realized the automated control to the system.

Description

Gas pipeline conveying system with control system

Technical Field

The utility model belongs to the technical field of the gas is carried, concretely relates to gas pipeline conveying system with control system.

Background

Gas pipe networks have developed rapidly in the last decade in order to meet the needs of urban development. For example, the gas group in Beijing is the largest single urban gas supplier in the country, and the scale of pipe network, the number of gas users, the annual gas consumption and the annual sales income are all listed in the national prestore. By the end of 2017, the natural gas supply quantity of a gas group in Beijing city reaches 154.8 billion cubic meters, the gas users of the Beijing internal and external pipelines approach 600 ten thousand households, the operation pipelines reach more than 2 million kilometers, and the application range of the natural gas extends from traditional civil cooking to various industries and fields including industry, heating, refrigeration, power generation, gas automobiles, distributed energy sources and the like.

Common pressure levels of a common gas pipe network comprise five levels of high pressure A (4.0MPa), high pressure B (2.5MPa), sub-high pressure A (1.0MPa), medium pressure A (0.4MPa) and low pressure. Along with the rapid increase of the coverage area of the pipe network, the operation management work becomes heavy instantly, more advanced management level and technical equipment are urgently needed to meet the development requirement, and the management concept of intelligent gas and intelligent pipe networks is developed at the same time. The intelligent gas pipe network development aims to release personnel from heavy and simple labor, and intelligent management work is carried out on the gas pipe network through advanced technical means and equipment, so that the working efficiency is improved, the labor intensity of the personnel is reduced, and the safe and stable operation of the gas pipe network is ensured more safely and effectively.

On the other hand, because the resistance drops of the metering pipelines are difficult to be completely equal, the working state of each branch line is unbalanced, the phenomenon that the flowmeter is broken by rush when the flow rate is large and the phenomenon that the flowmeter is not metered by gas when the flow rate is small is caused frequently, the phenomenon can be caused when manual switching is not timely, the maintenance cost of the flowmeter is increased, and the metering precision and accuracy are influenced.

The capital construction project is developed rapidly, at the initial stage of project planning, the gas demand of a user cannot be clear, great changes may exist in the long term, and the traditional gas metering design mode cannot follow the development pace of the capital construction project.

SUMMERY OF THE UTILITY MODEL

The utility model provides a gas pipeline conveying system with a control system for ensuring the precision and accuracy of metering, aiming at a gas system with large gas load change and large peak-valley difference in heating seasons and non-heating seasons, comprising a first manifold, a second manifold, a plurality of loop pipelines arranged between the outflow port of the first manifold and the inflow port of the second manifold, a PLC unit and a man-machine interaction unit, wherein, the loop pipelines are sequentially provided with a manual valve, a flowmeter and a loop control valve; the PLC unit comprises a CPU and an I/O module, and the I/O module is used for acquiring the operating parameters of the gas pipeline conveying system and adjusting the valve; the human-computer interaction unit comprises a display unit, an input unit and an alarm device, wherein the display unit is used for displaying the working condition of the gas pipeline conveying system, the input unit is used for inputting a setting value and issuing an operating working condition instruction to the I/O module in time, and the alarm device is used for alarming when the parameter is out of limit; the I/O module of the PLC unit is connected with the valve and the flowmeter, and the human-computer interaction unit is connected with the CPU of the PCL unit.

Further, the loop pipeline comprises a small-caliber metering loop pipeline and a large-caliber standby loop pipeline.

Further, the flowmeter is a gas turbine flowmeter.

Further, the loop control valve is an electric ball valve.

Furthermore, the number of the large-caliber standby loop pipelines is 1-3.

Furthermore, a flow regulating valve is further arranged on the small-caliber metering loop pipeline, and the flow regulating valve is arranged between the flowmeter and the loop control valve.

Further, the plurality of loop pipelines are connected in parallel through the first collecting pipe and the second collecting pipe.

Further, the filter system is connected with the inflow opening of the first collecting pipe.

And the gas output pipeline is connected with the outflow port of the second collecting pipe.

The utility model discloses guarantee the precision and the accuracy of measurement, the flowmeter is crossed gas and is not measured when preventing to break the flowmeter when large-traffic and little flow, has realized the automated control to the system.

Drawings

Fig. 1 is a schematic diagram of the parallel connection of the 4 loops of the present invention which is not used simultaneously;

FIG. 2 is a schematic diagram of the parallel connection of the 2-loop circuit of the present invention;

FIG. 3 is a flow chart of a metering process of the present invention which is not used when the 4-loop parallel connection is performed;

fig. 4 is a flow chart of the metering process of the present invention with 2 circuits connected in parallel and used simultaneously.

In the figure: a is a first manifold, B is a second manifold, I-1, II-1, III-1 and IV-1 are manual ball valves, I-2, II-2, III-2 and IV-2 are flow meters, I-3, II-3, III-3 and IV-3 are loop control valves, and II-4 is a flow regulating valve.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The utility model relates to an adapt to the development trend of china's city gas supply technique, be applied to the city gas transmission and distribution system of reality with high-tech research achievements such as intelligent pipe network, it will help promoting the development of gas equipment manufacturing and gas information industry, makes the technical level of whole city gas system reach higher level, makes the operation dispatch more accurate more intelligent.

Example 1

Referring to fig. 1 and 3, the utility model discloses a gas pipeline conveying system with control system, including collection pipe A, collection pipe two B and the 4 return circuit pipelines that set up between the outflow of collection pipe A and the inflow of collection pipe two B, and PLC unit and human-computer interaction unit, wherein, be equipped with manual valve I-1, II-1, III-1 and IV-1 on the return circuit pipeline in proper order, flowmeter I-2, II-2, III-2 and IV-2, and return circuit control valve I-3, II-3, III-3 and IV-3. The loop pipeline comprises a small-caliber metering loop, namely an IV loop, and 3 large-caliber loops, namely a first loop, a second loop and a third loop, wherein the IV loop, the first loop, the second loop and the third loop are connected in parallel through a first manifold A and a second manifold B. The loop control valve is an electric ball valve, and the flowmeter is a gas turbine flowmeter.

The gas pipeline conveying system of the utility model also comprises a filtering system and a gas output pipeline, wherein the filtering system is used for filtering impurities in the gas, and the gas pipeline conveying system is used for conveying the gas; the filter system is connected with an inflow port of the first collecting pipe A, and the fuel gas output pipeline is connected with an outflow port of the second collecting pipe B.

The utility model discloses still include PLC unit and human-computer interaction unit HMI for control gas pipeline conveying system, monitoring gas pipeline conveying system's operating condition, and in time feed back.

Referring to fig. 3, the serial port of the PLC and the serial port of the HMI are connected for data communication.

The PLC unit comprises a CPU and an I/O module, and the I/O module is used for acquiring the operating parameters of the gas pipeline conveying system and adjusting the valve; and the I/O module of the PLC unit is connected with the valve and the flowmeter. Wherein, the switch signals of the manual valves I-1, II-1, III-1 and IV-1 and the loop control valves I-3, II-3, III-3 and IV-3 are input into a DI module of the PLC, the flow signals of the flow meters I-2, II-2, III-2 and IV-2 are input into an AI module of the PLC, and the switch commands of the electric valves I-3, II-3, III-3 and IV-3 are output by a DO module of the PLC.

The human-computer interaction unit HMI comprises a display unit, an input unit and an alarm device, the display unit is used for displaying the working condition of the gas pipeline conveying system, the input unit is used for inputting parameter values and issuing operating condition instructions to the I/O module in time, and the alarm device is used for alarming when the parameters are out of limit.

In this embodiment, the priority order of the 3 large-diameter loops is set such that the loop i is the highest, and the loops ii and iii are sequentially lowered. The opening and closing processes of each loop are as follows:

a. opening a loop control valve IV-3 in summer or in a load valley, ensuring downstream air supply by using an IV loop, and setting one path with the highest priority as a standby loop according to the priority;

b. in winter or during load peak, when the flow of the natural gas in the IV loop reaches 0.8Qmax and the flow continuously reaches 0.8Qmax within 30 seconds, or when the flow of the natural gas in the IV loop reaches 1.1Qmax, the loop control valve I-3 is opened, the loop I is opened, and the loop control valve I-3 is closed after being opened; if the fluctuation generated by the 30-second intermediate flow is lower than 0.8Qmax, the 30-second timing is carried out again;

c. when the natural gas flow of the loop I reaches 0.8Qmax and the flow continuously reaches 0.8Qmax within 30 seconds, or when the natural gas flow of the loop I reaches 1.1Qmax, the loop control valve II-3 is opened, and the loop II is opened; if the fluctuation generated by the 30-second intermediate flow is lower than 0.8Qmax, the 30-second timing is carried out again;

d. when the flow of any one of the natural gas in the loop I and the loop II reaches 0.8Qmax and the flow continuously reaches 0.8Qmax within 30 seconds, or when the flow of the natural gas in the loop I and the loop II reaches 1.1Qmax, the loop control valve III-3 is opened, and the loop III is opened; if the 30 second intermediate flow fluctuates below 0.8Qmax, the 30 second timer will be reset.

e. When the natural gas flow of each of the loop I, the loop II and the loop III is less than or equal to 0.2Qmax and the continuous flow within 30 seconds is less than or equal to 0.2Qmax, closing the loop control valve III-3 and closing the loop III; if the 30-second intermediate flow fluctuates to 0.2Qmax, the 30-second timer will be started again.

f. When the natural gas flow of each path of the loop I and the loop II is less than or equal to 0.2Qmax and the continuous flow within 30 seconds is less than or equal to 0.2Qmax continuously, closing a loop control valve II-3 and closing a loop II; if the 30-second intermediate flow fluctuates to 0.2Qmax, the 30-second timer will be started again.

g. And when the natural gas flow of the loop I is less than or equal to 0.2Qmax, and the continuous flow within 30 seconds is less than or equal to 0.2Qmax, opening IV-3, then closing the loop control valve I-3, closing the loop I, and ensuring downstream gas supply by the loop IV. If the 30-second intermediate flow fluctuates to 0.2Qmax, the 30-second timer will be started again.

Example 2

Referring to fig. 2 and 4, the utility model discloses a gas pipeline conveying system with control system, including header A, header two B and 2 return circuit pipelines that set up between the outflow of header A and the inflow of header two B to and PLC unit and HMI (human-computer interaction) unit. Wherein, the loop pipeline is sequentially provided with manual valves I-1 and II-1, flow meters I-2 and II-2 and loop control valves I-3 and II-3. The loop pipeline comprises a small-caliber metering loop pipeline, namely a second loop and a large-caliber loop, namely a first loop, wherein the first loop and the second loop are connected in parallel through a first manifold A and a second manifold B. A flow regulating valve II-4 and a pressure transmitter PT are also arranged on the second loop pipeline, and the flow regulating valve is arranged between the gas turbine flowmeter and the loop control valve; the pressure transmitter PT is provided with 3 sets which are arranged according to 2-out-of-3 and used for data acquisition of a control system.

And the serial port of the PLC is connected with the serial port of the HMI for data communication. Switch signals of manual valves I-1 and II-1 and electric ball valves I-3 and II-3 are input into a DI module of the PLC, opening signals of a flow regulating valve II-4, which is a valve for performing the maximum flow protection control function on a loop II, are input into an AI module of the PLC, flow signals of flow meters I-2 and II-2 are input into the AI module of the PLC, switch instructions of the electric ball valves I-3 and II-3 are output by a DO module of the PLC, and opening instructions of the flow regulating valve II-4 are output by an AO module of the PLC.

The opening and closing processes of the two loops are as follows:

a. in summer or in load valley, opening the flow regulating valve II-4, using the second loop to ensure downstream air supply, and using the first loop as a standby loop; in winter or during load peak, when the natural gas flow of the second loop reaches 0.8Qmax and the continuous internal flow reaches 0.8Qmax within 30 seconds, or when the natural gas flow of the second loop reaches 1.1Qmax, the loop control valve I-3 is opened, the loop I is opened, and then the loop II-3 is closed; if the fluctuation generated by the 30-second intermediate flow is lower than 0.8Qmax, the 30-second timing is carried out again;

b. when the natural gas flow of the loop I reaches 0.8Qmax and the flow continuously reaches 0.8Qmax within 30 seconds, or when the natural gas flow of the loop I reaches 1.1Qmax, the loop control valve II-3 is opened, and the loop II is opened; if the fluctuation generated by the 30-second intermediate flow is lower than 0.8Qmax, the 30-second timing is carried out again;

c. setting the upper limit of a flow set value by the small-caliber loop, and taking the low values of 80% of the passing capacity of the regulating valve, the maximum passing capacity of a loop pipeline and the maximum value of the measuring range of the flowmeter; when the flow of the small-caliber loop reaches the upper limit of the flow set value, the output of the electric regulating valve is kept and is not opened any more;

d. when the flow sum of the natural gas in the two paths of the loop I and the loop II is less than or equal to 80% of the maximum flow of the flow meter I-2 of the loop I, and the flow continuously flows for 30 seconds and is less than or equal to 80% of the maximum flow of the flow meter I-2, the loop control valve II-3 is closed, and the loop II is closed; if the total flow of the natural gas in the middle loop I and the natural gas in the middle loop II reaches 80% of the maximum flow of the flowmeter I-2 in the loop I within 30 seconds, timing for 30 seconds again;

e. when the natural gas flow of the loop I is less than or equal to 0.2Qmax and the continuous flow within 30 seconds is less than or equal to 0.2Qmax, opening a loop control valve II-3, opening a small-caliber loop (a second loop), and then closing the loop I-3; if the 30-second intermediate flow fluctuates to 0.2Qmax, the 30-second timer will be started again.

The utility model discloses to the hysteresis quality of the artifical dispatch mode of flowmeter, carry out intelligent management work to pipe network metering equipment, improve work efficiency, reduce staff intensity of labour, rationally optimize personnel's structure, improve pipe network measurement reaction rate, guarantee gas metering equipment's safety and stability operation more safely effectively. The advantages are that:

1) the balance of the working state of each branch line of the gas metering system is ensured, and the resistance drops of all metering loops are basically the same.

2) And the downstream valve of the flow meter adopts an electric ball valve as a loop control valve to realize the automatic switching of the metering loop.

3) The flowmeter is prevented from being damaged by flushing in large flow, and the small-caliber metering loop is provided with a maximum flow protection control function.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the details of the above embodiments, and the technical concept of the present invention can be within the scope of the present invention to perform various simple modifications to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

Claims

1. A gas pipeline conveying system provided with a control system is characterized by comprising a first collecting pipe, a second collecting pipe, a plurality of loop pipelines arranged between an outlet of the first collecting pipe and an inlet of the second collecting pipe, a PLC unit and a human-computer interaction unit, wherein,

a manual valve, a flowmeter and a loop control valve are sequentially arranged on the loop pipeline;

the PLC unit comprises a CPU and an I/O module, and the I/O module is used for acquiring the operating parameters of the gas pipeline conveying system and adjusting the valve;

the human-computer interaction unit comprises a display unit, an input unit, a communication unit and an alarm device, wherein the display unit is used for working condition display, setting value modification and alarm display of the gas pipeline conveying system, the input unit is used for setting value input, the communication unit timely sends down the setting value and uploads operating working condition data, and the alarm device is used for out-of-limit alarm of parameters;

the I/O module of the PLC unit is electrically connected with the valve and the flowmeter, and the human-computer interaction unit is connected with the CPU of the PLC unit.

2. The gas pipeline transportation system of claim 1, wherein the circuit conduits include a small bore metering circuit conduit and a large bore backup circuit conduit.

3. The gas duct delivery system of claim 1, wherein the flow meter is a gas turbine flow meter.

4. The gas pipeline delivery system of claim 1, wherein the loop control valve is an electric ball valve.

5. The gas pipeline transportation system of claim 2, wherein the number of the large-caliber standby loop pipelines is 1-3.

6. The gas pipeline conveying system according to claim 2, wherein a flow regulating valve is further disposed on the small-caliber metering loop pipeline, and the flow regulating valve is disposed between the flow meter and the loop control valve.

7. The gas pipeline transport system of claim 1, wherein the plurality of return pipelines are connected in parallel by the first and second headers.

8. The gas duct delivery system of claim 1, further comprising a filter system coupled to the inlet of the first header.

9. The gas pipeline delivery system according to claim 1, further comprising a gas output pipeline, wherein the gas output pipeline is connected to the outflow port of the second collecting pipe.