Several problems in the optimization design of urban gas pipeline network
Strengthening urban gas network construction is of great importance for optimizing urban energy structure, reducing environmental pollution, improving urban functions and living quality of residents, and is a very important livelihood project. The urban residents use bottled liquefied petroleum gas as fuel, the use of safety coefficient is low and the need of road transport, and bottled liquefied gas, the price is high; with methane as the main component of natural gas with low price, high safety factor, clean and environmentally friendly features, in terms of price, environmental protection, convenience and security is better than liquefied petroleum gas, natural gas should accelerate the construction of urban network.
In recent years, with the development of city construction, the city continues to expand the scale of natural gas consumption increased dramatically, the gas pipe network system tends to be large and complex, various threats to network facilities and gas safety more and more factors, the network design is scientific, economic, safety and reliability will directly affect the gas pipeline the. The urban gas pipeline network is different from the logistics network or the power grid. It is the same as the heat pipe network and the water pipe network. How to optimize the design of urban gas pipeline network according to the local specific conditions and the characteristics of the gas pipeline system has become a problem worthy of further discussion.
Factors to be considered in the optimization design of urban gas pipeline network
1, a reasonable choice of pressure regulating device is one of the key links in the optimal design and implementation of urban gas pipeline network. How to choose the pressure regulating device reasonably is suggested to select the pressure regulating device with a main secondary regulator and an overpressure cut-off device, for example, Run Feng regulating cabinet.
The characteristics of the moistening and regulating cabinet are as follows:
One use one double way pressure metering cabinet (pre pressure metering)
(1) the inlet and outlet ball valves of the whole device can be found from the gas pressure regulating cabinet, so that even if there is a more urgent safety accident, it can also be shut down in the shortest time.
(2) Runfeng gas pressure regulating cabinet meet the large enterprise users and industrial boiler gas, standard gas flow pressure regulator shall be within the tolerance range, supply standards: a gas pressure regulating cabinet should be able to meet the daily gas 400 households consumption, if households is more large residents of the community, you can use a combination of a plurality of pressure regulating cabinet.
(3) the biggest advantage of the use of Run Feng main and auxiliary (one to one) two way pressure regulating cabinet is that it can completely rest 24 hours of gas consumption. If the main regulator fails, the secondary voltage regulator can be put into the operation of gas supply, which will not affect the user's use.
One use one double way voltage regulator (after pressure adjustment)
(4) the rational use of the pressure adjusting box can greatly reduce the construction cost and station area, like the original does not need to adjust the pressure to ban as a unit, which greatly reduces the pressure regulating equipment management fees and daily maintenance expenses, also makes the number of adjustable pressure box is greatly reduced.
(5) after using the overpressure emergency shut-off valve of Run Feng gas regulator, even if the pressure regulator is unstable or the regulator fails, the emergency shut-off valve will shut down automatically and need to be reset manually. This will not only protect the gas supply, but also ensure the safety of the gas supply.
The optimization of gas pipeline network in 2 cities and towns is carried out in depth with the optimization design of urban gas pipeline network, and the structure optimization of the pipe network is also progressing. The size of the town gas pipe network must meet the needs of the market. At the same time, the cost of material and the cost of erection should be guaranteed to achieve the best performance price ratio. We can transform the optimization of pipeline network into abstract numerical value, and take the erection cost of urban gas pipeline network as the objective function, and take the gas source node pressure value, the pipe pressure difference equation and the node flow equation as the conditions to carry out the numerical computation. The selection of pipe material is no longer based on the previous experience in construction practice, but should be considered in accordance with the needs of the optimized design.
3 urban gas network of pipe selection of city gas pipeline network is mostly used in traditional design of steel pipe, because of the long gas pipeline buried in the underground pipe, it is prone to corrosion, in order to avoid or delay the effects of corrosion on the pipeline, the pipeline must be corrosion effectively, the treatment is difficult and expensive. The PE pipe has the advantages of long service life, easy maintenance, simple installation, low cost, in the urban gas network began to be widely used, especially in the medium pressure pipeline.
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