Gas supply to the city district in Bryansk

Contents

Contents

ASSIGNMENT FOR THE COURSE PROJECT

Scope of work

Contents

Introduction

1. Determination of the population of the projected area of the city

3. Calculation of gas consumption

3.1. Determination of annual gas consumption

3.2. Determination of estimated gas hourly flow rates

3.3. Determination of specific gas hourly flow rates by development zones

4. Gas Network Routing

5. Determination of estimated gas flow rates in sections of ring gas pipelines

5.1. Determination of concentrated and specific gas travel costs for gas network circuits

5.2. Determination of Gas Travel Costs in Ring Sections

5.3 Determination of Estimated Gas Hourly Flow Rates in Ring Sections

6. Hydraulic calculation of gas pipelines

6.1 Calculation of low pressure street distribution rings

6.2. Calculation of intra-quarter gas pipeline

6.3. Calculation of internal house gas pipeline

6.4. Calculation of medium and high pressure gas pipelines

List of literature

Job for Course Project

by discipline

"Gas supply"

Develop a two-stage gas distribution system with medium pressure gas pipelines in the first stage and low pressure in the second stage. From the medium pressure network, design concentrated consumers: GRP, boiler room, bakery, bath, laundry. Household and communal consumers are designed from the low-pressure network. The low pressure network must be designed as a ring.

Option 14.

Source Data:

Climatic district Bryansk

View of driveways and sidewalks Improved

Size of the settlement area by 1 person 18 m2/person

External building volume for 1 person 60 m3/person

Gas supply source Severo-Stavropol

field

Gas pressure at connection point after GPC, MPa 0.4

Distance from GDC to city gas network, km 4

The location of the GRS relative to the area of ​ ​ the city of JV

Percentage of gas supply coverage

household, communal, concentrated bathhouse consumers 30%

commonly. Pit. 25%

bread. plant 0.7t/year

center. GVA 45%

Plot Plan Number 2

Initial diagonal number 61

Diagonal Pitch 1

Low heat of gas combustion 35695 kJ/m3

Highest heat of gas combustion 39615 kJ/m3

Gas density 0.727 kg/m3

Scope of work

Content of the calculation and explanatory note:

Introduction;

Calculation of gaseous fuel characteristics;

Calculation of the population of the designed area according to the characteristic zones of development;

Calculation of gas consumption by development zones;

Routing of gas pipelines and determination of the optimal number of gas distribution points (GRP);

Determination of gas travel and estimated expenses by sections of the ring network;

Hydraulic calculation of gas pipelines;

Conclusions;

Bibliographic list;

Content;

Graphic part 2 of the sheet:

General plan of the designed area (1:5000) with application of gas pipelines of medium and low pressure, GRP and contours;

Design diagrams of medium and low pressure gas pipelines with indication of flow rates, length of design sections and diameters;

Design quarter plan (M 1:1000) with low-pressure gas pipeline routing;

Floor plans of gasified building (M 1:100 or 1:200) with application of gas networks, instruments and ventilation units;

Axonometric diagram of the internal house gas pipeline with indication of expenses, lengths of design sections and diameters;

Longitudinal profile of the section of the gas pipeline crossing the roadway of the street;

Working drawing of one of the gas pipeline units (gas network element);

Specification for Materials and Equipment of the Internal House Gas Pipeline

Introduction

The purpose of the course project is to consolidate the theoretical material on the main issues of the "Gas Supply" course. To acquire the skills of independent work in the field of gas supply systems design and experience with reference and special literature.

In the design, it is necessary to develop a two-stage gas distribution system with the implementation of the first stage by medium (high) pressure gas pipelines. and the second - low pressure. From the medium (high) pressure network, consumers should design more concentrated: GRP, boiler room, bakery, bath, laundry. At the same time, the boiler room is located taking into account the "rose of the winds" for the designed area, and the bakery, bath and laundry are arbitrary. From the low pressure network, household and communal consumers are designed, the list of which is accepted according to SNiP 2.04.0887. The low pressure network must be designed as a ring .

Improvement, intensification and automation of technological processes led to the need to improve the quality of consumable heat carriers. Natural gas meets these requirements most than other fuels.

Modern city distribution systems are a complex complex of structures consisting of the following main elements: low, medium and high pressure gas networks, gas distribution stations, gas distribution points and installations. In the above stations and installations, the gas pressure is reduced to the required value and automatically kept constant. They have automatic safety devices that exclude the possibility of increasing gas pressure in networks above normal.

The gas supply system shall ensure uninterrupted gas supply to consumers, be safe in operation, simple and convenient to maintain, shall provide for the possibility of disconnecting its individual elements or sections of gas pipelines for emergency or repair work.

Recently, networks are being designed with structural and transport reserves in connection with the development of the city's gas supply system.

Determination of the population of the projected area of the city

The total population of the district is calculated, based on the density of housing stock (storeys of buildings), the size of the settlement territory (living space) per person and the area of ​ ​ each quarter.

The density of housing stock S, m2/ha, is taken into account the storey of buildings.

The size of the settlement area f, m2/person, is established based on the average housing supply of the population with a total area.

Calculation of gas consumption

City consumers spend gas unevenly. To identify the features of gas flow unevenness, city consumers are conditionally divided into the following main categories:

household (cooking and heating of water in apartments of residential buildings),

communal (baths, laundry, bakeries, public, medical, etc.),

heating, ventilation and centralized GVA of residential, public and industrial buildings,

industrial consumption for industrial and technological needs of the enterprise,

gas consumption by power plants for power generation, hot water and steam generation.

The gas flow rate is determined separately for each consumer.

3.1. Determination of annual gas consumption

Norms of annual heat consumption for household and communal needs are given in [1]. Annual gas consumption for household needs is determined by the population of the city (district) and gas consumption standards per person. Annual gas consumption for utility needs is determined depending on the capacity of the enterprise and gas consumption rates.

Gas Network Routing

Gas pipeline routes are designed according to the minimum length of the network. At the same time, high-pressure gas pipelines are trying to lay along the outskirts of the city, where there is a small population density and a smaller number of underground structures .

Low-pressure networks consist of street distribution gas pipelines, subscriber branches supplying gas to the building and internal gas pipelines that distribute gas between individual devices of the building. The density of distribution gas pipelines is accepted so that the length of subscriber branches before entering the buildings is 50100 m. Residential and public buildings, utility consumers, as well as small enterprises are connected directly to distribution gas pipelines.

To increase reliability of low-pressure networks ring. In low-pressure networks, it is advisable to ring only distribution gas pipelines, and make secondary (subscriber branches) dead end branched. There are no gas pipelines along the main passages.

The number of gas control points (GRP) is determined by technical and economic calculation. EMG is located in the centers of the zones that they feed. The range of one GRP shall not be covered by the range of another GRP. Gas flow meeting points in a system with several GRP are assigned at the boundary of zones of neighboring GRP.

When designing multi-stage gas supply systems, the question arises about the economically optimal range of Ropt GRP. As the number of FRG increases, the cost of the low pressure network decreases, but the total cost of FRG increases, as well as the cost of the medium (high) pressure network that feeds the FRG.

The most economical is considered Ropt = 400800 m.

Determination of estimated gas flow rates in sections of ring gas pipelines

In the design practice, the following procedure for calculating low-pressure ring networks is used:

Based on the known hourly flow rate of the consumed gas and the developed gas pipeline scheme, the concentrated hourly flow rate is calculated, which is consumed in the areas of each circuit of the gas network.

Based on known concentrated gas flow rates, specific travel rates are calculated for all consumer supply circuits.

Using the found values of specific travel expenses along the circuits of the network, the travel expenses for all sections of the gas pipeline are determined.

Based on Qp and the given initial distribution of flows in the network, the estimated gas flow rates for all sections of the network are determined.

Hydraulic calculation of low-pressure gas pipelines is carried out, the purpose of which is to select diameters.

The diameters of the main circuits are selected, while checking the completeness of the use of the calculated transition from the supply point to the flow meeting point;

Diameters of sections of intra-quarter and intra-house gas pipelines are selected by checking full use of the given pressure period.

5.1. Determination of concentrated and specific gas travel costs for gas network circuits

Calculation sequence:

On the scale of the plot plan, the design diagram of the low-pressure gas network with arbitrary ring numbering is drawn. Each ring must have its own constant specific hour gas flow rate yezon.

The concentrated hourly flow rates that are consumed in the areas of each ring Qc are calculated. For this purpose estimated hourly expenses of quarters located in ring contour and adjacent to it are summed.

Hydraulic calculation of gas pipelines

6.1 Calculation of low pressure street distribution rings

The purpose of the calculation is to determine the diameters of individual sections of street distribution gas pipelines.

The calculation is made in the following sequence:

Apply total allowable pressure losses in street gas pipelines

List of literature

Ionin A.A. Gas supply. - M.; Stroyizdat, 1981. – 415 pages.

Yenin P. M., Semenov M.B., Takhtamysh N.I. Gas supply of housing and communal facilities/Reference book. - Kiev: Budivelnik, 1981.136s.

Staskevich N.L., Severintsev G.N., Vigdarchik D.Ya. Handbook on gas supply and use. -L: Nedra, 1990.762s.

SNiP 2.04.0887 *. Gas supply. - M.: Stroyizdat, 1981.- 79s.

SNiP 2.07.0189 *. Urban planning. - M.: Stroyizdat, 2000. – 79 pages.

SNiP 2.01.0182. Construction climatology and geophysics. - M.: Stroyizdat, 1983-136 p.

Gordyukhin A.I. Gas networks and installations. Construction and design. M.: Stroyizdat, 1987. – 383 pages.

Skaftymov N.A. Fundamentals of gas supply. - L.: Nedra, 1975. – 343 pages.

Designer's reference book: internal sanitary devices. Part two. Water supply and sewerage ./Ed. I.G. Staroverov and Yu.I. Schiller. - M.: Stroyizdat, 1990-247 p.

Guskov B.I., Kryazhev B.G. Gasification of industrial enterprises. - M.: Stroyizdat, 1982. – 368 pages .

Курсовой проект газ2.dwg

Курсовой проект газ1 rogov.dwg