Gas supply to housing and industrial enterprises in the city of Bryansk - exchange rate

Contents

CONTENTS

Introduction

Design Task

1. Characteristics of the construction area

1.1 Name of the settlement where the construction is carried out

1.2 Population density of residential part of gasification area

1.3 Number of inhabitants in each quarter

1.4 Share of the population of each quarter of the population of the gasification area

1.5.Klimatic data for Bryansk

1.5.1. Design ambient temperature for heating design

1.5.2.The average outside temperature of the heating period

1.5.3. Heating period duration

2. Characteristics of gaseous fuel

3. Determination of annual gas demand

3.1.Based gas consumption

3.1.1.Preparation of food in neighborhoods with hot water supply

from RGK (blocks with 9-storey buildings)

3.1.2. Cooking and hot water in blocks with gas water heaters and gas stoves (blocks with 5-storey buildings)

3.1.3. Cooking and hot water in neighborhoods without hot water supply with gas stove (quarters with 1-storey buildings)

3.2.Gas consumption by large utilities

enterprises of the gasification area

3.2.1.Annual gas consumption by laundry

3.2.2.Annual gas consumption in baths

3.2.3. Annual gas consumption at the bakery

3.2.4. Gas consumption by large utilities

enterprises of the gasification area

3.3. Annual gas consumption by public enterprises and gasification district facilities

3.3.1.Annual gas consumption by hospitals

3.3.2.Annual gas consumption by clinics

3.3.3. Annual gas consumption by schools

3.3.4. Annual gas consumption by hotels

3.3.5. Annual gas consumption by canteens and restaurants

3.3.6. Annual gas consumption by unaccounted consumers

3.3.7. Annual gas consumption by public enterprises and gasification district facilities

3.4. Annual gas consumption for heating and hot water supply

from RGC and individual heating plants

3.4.1.Annual gas consumption for heating and hot

water supply from RGC

3.4.1.1. We calculate the annual heating gas consumption from the RGC

for blocks with 9-storey and with 5-storey buildings, according to the formula

3.4.1.2. We calculate the total annual gas consumption for heating from RGC

3.4.1.3.We calculate the annual gas flow rate for hot water supply

from RGC according to the following formula

3.4.2. We calculate the annual gas consumption for heating and hot

water supply from RGC

3.4.3. Annual gas consumption for heating and hot water supply from individual heating plants

3.4.4. We calculate the annual gas consumption for heating and hot

water supply from RGC and from individual heating plants

3.5. Annual gas consumption by industrial enterprises of the gasification area

3.5.1. Head gas flow at three-shift production

3.5.2. Annual gas consumption in two-shift production

3.5.3. Annual gas consumption in single-shift production

3.5.4. Annual gas consumption by industrial enterprises of the gasification area

3.6. Total annual gas consumption by individual quarters and gasification area

4. Determination of gas flow rates

4.1. Design-hour gas consumption in quarters with heating from individual heating plants (quarters with 1-storey buildings)

4.2.Recalculate estimated-hour gas consumption in quarters with heating from individual heating plants

4.3. Estimated gas consumption in blocks with 9-storey buildings

4.4.Computed gas consumption in blocks with 5-storey buildings

gasification area

4.5.1. Design-hour gas flow rate in laundry

4.5.2. Design-hour gas flow rate in the bath

4.5.3. Calculation and hourly gas consumption at the bakery

4.5.4. Design-hour gas flow rate from RGC

4.6. Design-hour gas consumption at industrial enterprises

gasification area

4.6.1.Computed-hour gas flow rate for three-shift production

4.6.2.Computed-hour gas flow rate for two-shift production

4.6.3.Computed-hourly gas flow rate for single-shift production

5. Gas dynamic calculation of gas pipelines

5.1. Gas dynamic calculation of low pressure network

5.1.1.Define the total number of EMG

5.1.2.Define gas flow meeting points

5.1.3. Determination of specific gas travel expenses for all consumer supply circuits

5.1.4. Determination of specific gas flow rates for sections of low pressure network

5.1.5.Define Gas Flow Rates for Low Pressure Network Sections

5.1.6. Determination of transit gas flow rate in sections of low pressure network

5.1.7.Determination of design gas flow rate in sections of low pressure network

5.1.8. Determination of mean hydraulic slope

5.1.9. Gas dynamic calculation of low pressure network

5.2. Gas dynamic calculation of medium pressure network

5.2.1 Preliminary calculation of gas pipeline ring diameter

5.2.2. Gas dynamic calculation of gas network emergency modes

5.2.3. Flow distribution in normal mode

5.2.4. Check of branch diameters in design mode

5.3. Gas dynamic calculation of internal house gas pipeline

5.3.1. Determination of estimated gas consumption in the house network

5.3.2. Gas dynamic calculation of house gas pipelines

6. Equipment selection for network GRP

6.1 Gas Reduction Point Selection

6.2. Selection of pressure regulator

6.3. Selection of gas filters

Conclusion

List of literature used

Applications

Introduction

Modern urban distribution systems are a complex complex of structures, consisting of the following main elements: gas networks of low, medium and high pressure; gas distribution stations, control and regulatory points, gas control 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 the pressure in the networks above normal; communication and telemechanization systems.

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 repair or emergency work.

Facilities, equipment and units in the gas supply system should be of the same type. The adopted version of the system should have maximum economic efficiency and provide for the construction and commissioning of a gas supply system in parts.

The main element of urban gas supply systems are gas networks. According to the number of pressure levels used in gas networks, gas supply systems are divided into:

1. two-stage, consisting of low and medium or high (up to 0.6 MPa) pressure networks;

2. three-stage, including low, medium and high pressure pipelines (up to 0.6 MPa);

3. multistage, in which gas is supplied through gas pipelines of low, medium and high (up to 0.6 and up to 1.2 MPa) pressure.

The choice of the gas supply system of the city is influenced by a number of factors. The main ones are: 1) the nature of the gas source, the properties of the gas, the degree of its purification and humidity; 2) the size of the city, the peculiarities of its layout and development, population density; 3) number and nature of industrial consumers; 4) the presence of natural or artificial obstacles to the laying of gas pipelines.

Gas is supplied to the city through several main gas pipelines, which end with gas distribution stations (GRS). Gas pressure decreases in GPC and it enters the high-pressure network. Underground gas storage is connected to high-pressure ring through control and control station. Medium and high pressure gas pipelines (up to 0.6 MPa) serve to supply low pressure urban distribution networks through gas control stations (GRP). They also supply gas through GRP and local gas control plants (GRU) to gas pipelines of industrial and municipal enterprises. Low-pressure gas pipelines serve to transport gas to residential and public buildings, as well as small public utilities, and small heating boilers can also join them.

The number of FRG supplying the low pressure network is determined by technical and economic calculation. The FRG is located in the center of the zones that they feed, the zones of action do not overlap. Gas pipeline routes are designed with minimum network length. Distribution networks consist of main lines and subscriber branches.

In this course project, the main characteristics of the construction area and gaseous fuel will be determined. Annual and estimated-hour gas flow rates are calculated. Low and medium (high) pressure networks are designed and calculated. Equipment for network GRP is selected.

Assignment for gas supply system design

1. Settlement: Bryansk.

2. Plot Plan Number: 6

3. GRS number: 1

4. Water supply and heating of neighborhoods:

A (with hot water supply from the district gas boiler house and central heating (9 storeys): 3,4,5,6

B (with hot water supply from flowing water heaters and central heating (5 storeys): 7.9

In (without hot water supply with heating from individual boiler houses (1-storey building): 1.2

5. District gas boiler house: quarter No. 9.

6. Bakery: quarter number 6.

7. Bath and Laundry Plant: Quarter No. 5.

8. Percentage of gasification coverage of public buildings and structures:

Pa = 31%.

9. Specific cubic structure of residential buildings: Vud. = 52m3.

10. Industrial enterprises:

A: three-shift production:

Quarter No. 8 P pr1 = 153 million tons/year ;

B: two-shift production:

Quarter No. 10 P pr2 = 8 million ft/year ;

C: single-shift production:

Quarter No. 11 P pr3 = 6 million sht/year ;

11. The population density of the residential part of the district: n = 176 people/ha.

12. Gas composition variant: No. 3 .

Determination of estimated gas flow rate

The calculated gas hourly flow rate serves as the initial data for determination of gas pipeline diameters, for selection of sizes and types of gas valves, equipment and equipment.

Gas dynamic calculation of gas pipelines

When designing pipelines for gas transportation, the selection of pipe sizes is based on their gas dynamic calculation, which aims to determine the internal diameter of the gas pipeline to pass the required amount of gas at permissible pressure losses for specific conditions or vice versa, pressure loss during transport of the required amount of gas through a gas pipeline of a given diameter.

Since the formulas for gas dynamic calculation by the gas pipeline are quite complex, instead they are used nomograms built according to the formulas given in Appendix 1,2.

Gas dynamic calculation is carried out in accordance with the general plan of the microdistrict of Bryansk with the formed gas supply system of low and medium pressure networks

5.3. Gas dynamic calculation of internal house gas pipeline

Gas pipelines in buildings are laid openly. If they intersect foundations, floors, staircases, walls, and partitions, they are enclosed in steel cases. Within the case the gas pipeline shall have no butt connections and the space between it and the case shall be filled with bitumen. The end of the case is brought over the floor to a height of 3 cm. Gas pipelines intersecting with the electric wire are enclosed in a rubber or ebonite pipe.

Calculation of in-house gas pipelines is carried out after selecting and placing equipment and developing a gas pipeline scheme. The calculation begins with the highest and farthest instrument in the building. On the calculation diagram, the numbers of the node points from the farthest upper device to the entry into the building are placed and gas flow rates are determined from the sections of the house network by the nominal gas flow rates of the devices. The set of devices installed in apartments is conditionally designated: GK - gas fast-acting water heater; P-2- plate is two-room, installed in 1- and 2- room apartments; P-4 - four-room slab is installed in 3-room apartments or more. Installation of gas instruments is given in Appendix 3.

Conclusion

In this course project, a two-stage gas supply system was developed for the Belgorod microdistrict.

Characteristics of the construction area and gaseous fuel are determined. Annual and design-hour gas requirements are calculated. Gas dynamic calculation of low and medium pressure networks was carried out. The design of a low-pressure network for supplying gas to domestic consumers and a medium-pressure network for supplying gas to industrial consumers, a gas generator for supplying the low-pressure network, a district gas boiler house, a bath and laundry plant and a bakery was carried out.

Emergency modes of the high pressure network were calculated when the head sections were switched off to the left and right of the power supply point, to provide gas to the most remote consumers. Calculation was made taking into account all standards, pressure losses do not exceed permissible values.

Gas control station, pressure regulator and filter are selected.

In addition, a system of an internal house gas pipeline of a 9-story residential building was designed, a gas dynamic calculation of the internal house gas pipeline was made.

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