Heating line construction technology

Contents

Introduction

1. Heat supply

1.1. Heat Loads Calculation

1.2. Schedule of quality control of heat release for heating

1.3. Determination of the flow rate of network water passing through

ventilation system calorifers

1.4. Network water flow chart

1.5. Mechanical calculation

1.6. Calculation of GDP connected according to a two-stage mixed scheme

1.7. Hot water supply

2. Automation

3. Heat generating plants

4. Technology and organization of construction and assembly and procurement works

5. Occupational safety in construction

6. Economy

7. List of literature

Introduction.

Heat supply is a large branch of the national economy, one of the main energy systems. About 1/3 of all energy resources used in the country are spent on heating the national economy and the population.

The main areas of improvement of this subsystem are centralized heat supply. At the beginning of the 20th century, in connection with the mass production of electric motors, central water heat supply was developed.

Centralized heat supply is based on the use of large district boiler houses characterized by greater efficiency than small heating plants.

With decentralized heat supply, small heating plants, which are the source of pollution of the air basin, are eliminated, large heat sources are used instead, the gas emissions of which contain minimum concentrations of toxic substances. Thus, centralized heat supply contributes to solving the major problem of our time - environmental protection.

The development of industry and widespread housing and communal construction causes a continuous increase in the heat load, while the process of concentrating this load in large cities is underway, which creates the basis for further development. The prospects for the development of district heating supply determine the great tasks of improving and improving the efficiency of construction and operation of sources, transport systems and heat consumption.

In this thesis, a heat supply project for the Tomilin distribution warehouse complex was developed.

Design temperature for design for Lyuberetsky District of Moscow tpr =28C.

The centralized heat supply system consists of the following main elements: a heat source, a heat network and local consumers. The heat supply source is the district boiler house.

Hot water is used as a coolant, which is supplied from the Power Unit through a two-pipe system to the ITP of warehouse buildings and ITP of the Administrative and Domestic Building. Hot water is supplied to the consumer through the supply pipeline, gives heat in heat exchangers and after cooling it returns through the return pipeline to the heat source. Thus, the heat carrier continuously circulates between the heat source and the consumers. The circulation is provided by the heat source pump substation.

Heat pipelines are laid in underground impassable channels, in a channel-free manner under lawns and above ground on low and high supports. To reduce heat losses during coolant movement through pipelines, thermal insulation from mineral wool mats is used, steel pipes are used in SGP insulation.

The heat supply system is automated, and the amount of heat supplied is controlled in accordance with the requirements of consumers. The largest amount of heat is spent on heating buildings. The heating load changes as the outside temperature changes. It is not possible to achieve high quality of heat supply, applying only central regulation, so additional automatic control is used at heat stations.

Heat stations provide the necessary amount of heat in the building for their heating and ventilation. The water flow rate for hot water supply is continuously changed, and to maintain stable heat supply, the hydraulic mode of the heating networks is automatically controlled, and the temperature of hot water is kept constant.

Heat points.

On the territory of the complex, the construction of the Power Unit - a gas boiler house is provided.

Instruments are installed in boiler room on coolant T = 13070 C0

heat energy accounting.

Heat carrier for heating, ventilation and hot

water supply of housings will be water with parameters

T = 95-70 С 0.

Preparation of water with T=9570 C0 parameters is carried out on

independent circuit for connection of heat exchangers (Alfa Laval) to heat networks.

Accidental water removal in the boiler room is carried out to the ramp.

In the boiler room on the local control board, light is provided

and sound signalling of standby pumps switching on and

reaching the following parameters:

- water pressure in supply and return pipelines on

input of heating system (min-max);.

- temperature of water supplied to the system (to heat networks);

(min. - max.);

- set pressure in the system return pipeline.

Alarm output is possible

to the control room .

Thermal loads by enclosures and types of heat consumption, see

Table.

Connection to heating and ventilation systems

is provided according to a dependent scheme..

Preparation of water for hot water supply system in storage

sky cases with the T=6550C parameters it is carried out on the 2nd stupen-

hot circuit of heat exchangers connection to heat networks.

Preparation of water for hot water supply system in ABK

is carried out by electric heating.

The following are installed in ITR:

- thermal energy metering units;

- Alfa Laval plate heat exchangers (except ABK);

- Grundfos GVA circulation pumps.

(1working, 1reserved) (except for ABC);

- control valves are accepted with electric drive, as well as

direct action, in ABC direct action.

Valves and control valves used - domestic

and imports.

Diversion of accidental water to ITP of clade hulls (except for No. 39) and

ABK is carried out in the ladder

Accidental water discharge in the housing No. 39 is carried out in the pit where

a drain pump is installed with pumping of water into the household

sewage system.

In ITR on the local control panel light is provided

and sound signalling of standby pumps switching on and

reaching the following parameters:

- water pressure in supply and return pipelines on

input of heating system (min-max);.

- water temperature entering the WAN and heating system

(min. - max.);

- set pressure in the system return pipeline.