Automate the thermal assembly. AOB

BELARUSIAN STATE

BELENERGO ENERGY CONCERN

GOMELENERGO

Energy Generation Branch

CONSTRUCTION PROJECT

"Installation of heat energy metering device and control system for heating and hot water supply in ITP of Gomel RES building as per

Gomel St. Humpback 82 "

The technical solutions adopted in this project comply with the requirements of environmental, sanitary, fire-proof explosion-proof and other existing interstate and national norms and rules and ensure safe operation of the facility for life and health of people, subject to the measures stipulated by the project.

General Instructions

This project is based on:

1. SNiP 2.04.0786 "Heat Networks"

2. SNiP 2.04.0185 "Internal water supply and sewerage of buildings"

3. SNB 2.04.0197 "Construction heat engineering"

4. SNiP 3.05.0785 "Automation Systems"

5. "Rules for accounting of heat energy release" PR 347001085

6. "Temporary instruction on the procedure for equipment of metering units for mutual settlements between consumers and suppliers of thermal energy," approved by the Ministry of Energy of the Republic of Belarus 30.04.93

7. Manufacturer's Instruction for Thermal Energy Meter

8. STB EN 143422004 "Heat Meters, Part 2"

9. STB EN 143462004 "Heat Meters, Part 6"

10. SNB 4.02.013 "Heating, ventilation and air conditioning"

11. STB P GOST R 8.5912002/2004 "Two-channel heat meters for water heat supply systems. Normalization of permissible error limits at measurement of thermal energy consumed by subscribers "

12. Manufacturer's instruction for MP01 regulator.

This section provides for the equipment of the ITP of the Gomel RES building at Gomel st. Gorbatov 82 with a system for accounting for thermal energy and automatic regulation of heating and GVA.

The purpose of the heating and WAN control plant is to provide a mode of saving thermal energy resources.

To automatically control the consumption of thermal energy consumption, the two-circuit controller of thermal energy consumption MP01 is adopted for the plant.

Temperature sensors for the thermal energy flow controller are installed on the supply, return pipelines, on the hot water pipeline at the outlet of the heat exchanger and the outdoor temperature sensor installed on the north side of the building. For the heat energy meter, the primary transducers are installed on the supply and return pipelines, and temperature sensors on the supply, return pipelines and the cold water supply pipeline.

Average hourly flow rate of mains water for heating - 3.68 m3/h

Average hourly flow rate of mains water per GVA - 2.8 m3/h

Due to the fact that the average hourly flow rate of water for heating and HVA is 5.4 m3/h, we select the TEM104/2 heat meter with a diameter of 32 mm, with an operating range of 0.07530.0 m3/h;

For heating circuit we accept adjustable valve Dn = 32 mm Kv = 6.3 m3/h;

For WAN circuit we accept adjustable valve Dn = 25 mm Kv = 4 m3/h;

Technical characteristics of thermal energy meter TEM-104/2

Heat meter provides measurement of volume and mass flow rate of heat carrier, as well as volume and mass of heat carrier in the range from 0.25 to 100% of selected maximum flow rate Gmax.

Coolant network water

Coolant temperature range 0-1500С

Temperature difference in direct

and return pipelines 3-1400С

Nominal passage diameter 32 mm

Minimum flow of 0.075 m3/h

Maximum flow rate 30.0 m3/h

Processor: 220 V, 50 Hz, consumption (maximum) - 15 VA, protection class - IP 64. Flowmeter: pressure - 2.5 MPa, Protection class IP 65.

The processor has a two-line LCD backlit display. The readings on the display are switched over by pressing the buttons on the instrument panel, and the following main readings are displayed:

Current time and calendar date

consumed energy with increase (Gcal, MWh),

volume and weight of coolant with increase (m, t);

instantaneous power (KW, Mkal);

instantaneous coolant flow rate (me/h, t/h);

temperature values in supply and return pipelines (° С);

temperature difference in forward and reverse pipelines (° С);

operating time of the device.

Technical characteristics of dual-circuit flow controller MP01.

- heating circuit controlled by the saddle valve DN = 32mm Kv = 6.3 m3/h, installed on the supply pipeline. Temperature correction is provided by readings of network water temperature sensors of supply-mixed and backmixed water, as well as by readings of external air temperature sensor;

- hot water temperature maintenance circuit, controlled by saddle valve SF Dn = 25mm Kv = 4 m3/h, installed on the line water pipeline supplying to the heat exchanger. Correction shall be made by readings of the hot water temperature sensor installed in the hot water pipeline supplying at the heat exchanger outlet.

The regulator during operation provides:

- setting of thermal energy consumption control mode;

- automatic maintenance of the specified control mode in the supply pipeline of the object after the mixing unit;

- control of actuators (control valves and pumps);

- temperature monitoring depending on the operating mode (inputs in the WAN system, coolant in the supply pipeline of the object heating system after the mixing unit, coolant in the return pipeline of the object heating system, outdoor air);

- limitation of network water temperature in the return pipeline;

- protection of heating system from overheating;

- frost protection;

- transient mode "zimaleto."

Wiring to instruments and automation tools is accepted according to the manufacturer's instructions by cables and wires protected by vinyl plastic pipes and metal shells.

Specifying safety measures

1. For installation and operation of the regulator and thermal energy metering device, persons who have undergone safety training and instruction during work with radio measuring devices, who have familiarized themselves with these maintenance equipment with a qualification group for electrical safety of at least 3, who have learned safe techniques and methods of work are allowed.

2. The source of danger during installation and operation is electric current and coolant, which is under pressure up to 16 kGs/cm2 at temperature up to 150 0С.

3. Safety of regulator operation is ensured by:

- strength of control valve and protective sleeves;

- insulation of electrical circuits of regulator components;

- reliable grounding of regulator components.

Grounding

For the grounding of equipment and automation means, separate wires of wiring are used, specially designed for this purpose.

Installation and adjustment of automation equipment shall be carried out in accordance with the requirements of SNiP 3.05 0785.

Instrumentation & Automation

Heat station automation is performed in the following volume:

- accounting of heat energy consumption;

- control of water temperature in heating and hot water supply system;

- local control of water temperature and pressure.

Heat meter TEM104/2 is used to account for heat energy consumption. Temperature sensors are installed on supply, return network pipelines and cold water supply pipeline. Heat meter flow sensor is installed on supply and return network pipeline.

Information on temperature and flow rate of coolant is converted into electric signal and transmitted to electronic thermal calculator, displayed on its annunciator in digital expression.

Water control in the heating and hot water supply system is carried out by microprocessor control system MP01. Power supply of TEM104/2 heat meter and temperature regulator is provided from the common group (AP50B20BM automatic circuit breaker) of the existing power panel.

Installation of thermal energy measurement and control tools shall be carried out in accordance with manufacturer's certificates.

Local control of temperature and pressure of direct and return network water, hot and cold water is carried out by thermometers and pressure gauges taken into account in the specification in accordance with the automation diagram.

In order to avoid injuries of maintenance personnel from electric shock, protective grounding of the device and electrical equipment is provided according to PUE.

All non-energized metal non-conductive parts of the equipment shall be occupied. Additional cable cores, PVZ wire are used as the main zero protective conductors.

When the pipelines are emptied, the heat meter and temperature controller shall be switched off. During welding operations, the pipelines must be reliably grounded before and after the welding site, the thermal energy measuring and control means must be disconnected from the 220V network.

Selection of heating system correction pumps.

Based on the average hourly instantaneous flow of mains water for heating according to the technical catalog of pumps "DAB," we select a pump of grade DABD50/250 40M 32/25 with the following characteristics:

Gn = 2 m3/h, H = 5.0 ppm

The design of this pump allows it to be used as two mixing pumps - the main and standby pumps. When one engine goes out of operation, the second engine (standby pump) is automatically switched on.