Roof modular boiler room of residential building

Contents

7 BOILER ROOM AND GAS SUPPLY

7.1 Thermal mechanical solutions

7.1.1 Boiler Room Thermal Capacity

7.1.2 Fuel and fuel supply

7.1.3 Main Equipment

7.1.4 Boiler room thermal diagram. Selection of auxiliary equipment

7.1.5 Equipment Layout

7.1.6 Water regime

7.1.7 Gas supply

7.1.8 Organization of labor, production control system, organization and mechanization of repair works

7.1.9 Occupational safety and safety

7.2 Process automation

7.3 Power supply

7.3.1 Electrical equipment

7.3.2 Electric lighting

7.3.3 Protective safety measures

7.4 Heating and ventilation

7.5 Gas supply

1.1.4 Boiler room thermal diagram. Selection of auxiliary equipment

The thermal diagram consists of four systems, according to which thermal power is supplied to consumers:

9-storey residential building - section 1;

9-storey residential building - section 2;

14-storey residential building - section 3;

boiler room ventilation.

Each heat supply system is closed four-tube.

Type and parameters of coolant:

network water with temperature 9070 0С;

hot water supply system water with temperature of 50 0С.

The total heat load on two 9-story sections of a residential building is 0.750 MW (0.645 Gcal/h), including for:

heating - 0.430 MW (0.370 Gcal/h);

hot water supply - 0.284 MW (0.244 Gcal/h);

boiler room ventilation - 0.036 MW (0.031 Gcal/h).

Therefore, the heating load for heating and hot water supply of two 9-storey sections of a residential building is provided by seven heating modules MH120 (item K1).

Supply of hot water in a heating system of buildings is carried out by means of the module regulator of temperature of ARD65 (position K2) which is intended for regulation of water temperature in a heating system depending on external weather conditions.

In the lower part of the modulator, there is a collection and distribution pipe, which is a connecting element of the boiler. Hot water flows through it for heating and reverse "cold" water. Circulating pump drives heated water through heating system through collecting-distributing pipe. Only one pump always operates, the second is standby. In case of failure of the first pump, the second pump is automatically switched on. A three-way valve with an actuator controls the temperature of water supplied to the system by mixing hot supply water with cold return network water. The temperature controller controls the temperature of the supply network water depending on the external temperature. The external temperature sensor is installed on the outside of the heated room. A filter is installed to clean the return mains water supplied to the module. Moth valves provide disconnection of individual devices of the module.

Hot water is supplied to the ventilation system using the constant temperature module ARTD-32 (item K5), which is designed to maintain constant water temperature in the ventilation system.

The device of the constant temperature module ARTD32 is similar to the device of the temperature control module APD65, with the exception of a three-way valve.

Hot water for the needs of hot water supply of a residential building is prepared in the module for hot water production of MGVP2 (item K4) with a capacity of 100 l/min. The MGVP2 module consists of the lamellar heat exchanger, circulators of the heating and heated contours, control valves, fittings, thermal sensors. Filters are installed on source water pipelines and hot water circulation pipeline.

Inside each control module there is an electric cabinet containing devices that provide operation of the electric part of the module. The module receives power from the central cabinet of the main distribution control board. Voltage removal and supply is performed using own circuit breaker.

The total heat load of the 14-story section of the residential building is 0.502 MW (0.432 Gcal/h), including for:

heating - 0.260 MW (0.224 Gcal/h);

hot water supply - 0.242 MW (0.208 Gcal/h).

Five heating modules MH120 (item K1) are provided to provide this heating and hot water supply heat load. Supply of hot water in a heating system of the building is carried out by means of the module regulator of temperature of ARD50 (position K3), and hot water for a heating system of the building is prepared in the module of preparation of MGVP2 hot water (position K4). Booster pumps (items K5, K6) are installed to supply coolant to the heating and hot water supply system of the 14-storey section of the residential building.

The heating system is made up of source water, which is softened in a special automatic installation. For certain (abnormal) situations emergency makeup of source water is provided. For this purpose, a bridge is provided between the source water pipeline and the makeup water pipeline.

During the heating of the system and the load set by the heating boilers, a sharp increase in the volume of water occurs and, as a result, an increase in the pressure in the system. To compensate for changes in the volume of the medium circulating in the system, two expansion vessels are installed (items K8, K9).

The following auxiliary equipment is provided for normal operation of the hot water boiler:

temperature module regulator for a heating system of 9-storey inhabited ARD65 sections (position K2) with two pumps GrunfosUPS65180 giving of 20 m3/h, a pressure of 12 m everyone (from which one worker, the second reserve);

temperature control module for the heating system of the 14-storey residential section of the APD50 type (item K3) with two pumps GrunfosUPS50180 supply of 15 m3/h, head of 11.5 m each (one of which is working, the second is standby);

two hot water preparation modules of MGVP2 type (item K4) (with plate heaters) with a capacity of 100 l/min with circulation pumps of the first circuit UPS5060/2F with a supply of 15 m3/h, a head of 12 m and the second circuit UPS5060/2F (B) with a supply of 6 m3/h, a head of 4 m;

module of constant temperature of boiler room ventilation system of ARTD32 type (item K5), with two pumps GrunfosUPS32120 supply of 2 m3/h, head of 7 m each (one of which is working, the second is standby);

two circulation pumps of the hot water supply system of the 14storey residential section WilloIPL321301,1/2 (item K6) with a supply of 5 m3/h, with a head of 20 m each (one working, the second standby);

automatic water softening device (item K7) with a capacity of 650 l/h, consisting of two ion exchange columns (of which one is working, the second for regeneration), a source water reserve tank with a capacity of 500 l, a tank for preparing a regeneration salt solution, two make-up pumps GrunfosJP524 a supply of 0.5 m3/h, a head of 35 m each (of which one is working, the second is standby);

two volume compensators with a capacity of 1000 liters for a heating system of 9-storey residential sections and a capacity of 750 liters for a heating system of a 14-storey residential section;

tank for drain from safety valves with capacity of 1 m3;

four gas convectors KOG5 ("Ros") with a nominal heating capacity of 5.8 kW, designed for heating the boiler room, if for any reason the main heating of the boiler room turns off and the temperature in the room drops to 5 0С;

two sets of off-module parts (one for each group of boilers), each set of which includes two side panels, a thermostat, a control cabinet with a rack, a water filling device, a safety unit, a connecting water pipe, flanges, brackets.

In addition to the listed equipment, the thermal diagram provides a set of the following equipment: safety and control valves, hot and cold water meters, heat meters, filters, isolation valves and other necessary equipment to ensure the normal functioning of the hot water boiler room.

1.1.5 Equipment Layout

Heating modules and control modules are installed in the center of the boiler room in two groups along axes 1-3. Heating modules are combined into groups of seven and five boilers, which are installed by rear walls to each other, respectively, four and three modules in a row. Temperature control module and hot water preparation module are installed on left side to each formed group of heating modules. All modules are connected to each other by means of flange connections. Each heating equipment group shall have a special foundation 100 mm high.

Volume compensators and automatic water softening unit are installed along axis 3.

Gas convectors are installed along axis B under window openings.

The boiler room also houses all pump equipment, relief valve drain tank, automatic equipment, instrumentation and other small equipment

For each heating module there is an individual exhaust of flue gases. Flue gases used in boilers are discharged through boiler room roof by independent vertical gas ducts of rectangular section 490150 mm made of corrosion-resistant steel. The length of each gas duct is 3.6 m, the elevation of the mouth of the gas duct relative to the ground level is 34,000 m.

1.1.7 Gas supply

Technical solutions for gas supply are made taking into account requirements

DNAOP 0.001.20-98.

From the high-pressure street gas pipeline laid along ul. Ring natural gas enters the SHP2 type gas control cabinet, designed for gas reduction. After the cabinet unit, gas with excess pressure of 0.0002MPa (0.02 kgf/cm2) is supplied to the designed residential building through the common gas pipeline DN 100.

From the point of connection to the existing medium-pressure street gas pipeline to the designed residential building, the gas pipeline is laid underground at a depth of not more than 1.2 m from the top of the pipe to the planning elevation of the ground.

Steel shutoff valves are installed at the gas pipeline inlet and outlet from the gas control unit cabinet.

The cabinet unit is installed on the support in the grid fence. A canopy is built above the installation, lighting is provided.

Gas is supplied to the boiler house by one common gas pipeline Dn 80, from which gas pipelines Dn 65 are provided to two groups of heating modules.

Fast-acting shut-off valve, filter, gas counter with corrector, shut-off valves are installed at gas pipeline entry into boiler room.

Four gas convectors (gas flow rate 0.75 m3/h for each) are also connected to the common gas pipeline, with the help of which the boiler room will be heated in winter during an emergency shutdown of the boiler room. To measure the flow rate of gas burned in gas convectors, a gas meter G4RL is installed.

In the diagram of gas pipelines there is a sampling device and a system of purge gas pipelines.

For continuous monitoring of microconcentration of natural (up to 1%) and carbon monoxide (up to 0.01%) gases in the boiler room air, installation of "Leleka2" SZM-NR gas indicator is provided.

If the concentration of natural and carbon monoxide increases above the permissible ones, except for the supersonic signal, which is transmitted to the room where the duty personnel are located, the gas detector transmits a "command" to close the electromagnetic valve, which stops the gas supply to the boiler room.

The arrangement is made in such a way that all valves, instrumentation, meters and other equipment located on natural gas pipelines are available for servicing from the floor elevation of the boiler room.

1.1.8 Labor organization, production control system, organization and mechanization of repair works

The boiler plant is equipped with modern monitoring and control tools that ensure the operation of the main and auxiliary equipment in automatic mode without the presence of permanent maintenance personnel.

Information about boiler room operation, as well as emergency light-and-sound alarm about equipment normal operating conditions violations are output to the room where the duty personnel are located. Personnel on duty must be specially trained and trained in safety.

All maintenance of boiler room equipment, troubleshooting and preventive repairs will be carried out by a specialized organization. The organization that will be involved in the service should have all the necessary lifting mechanisms, devices, tools, instruments and other means.

The design of modular units makes it possible to repair equipment without stopping the boiler room, which increases reliability and reduces the cost of repair work.

1.1.9 Occupational Safety and Safety

The boiler room is designed taking into account the requirements of sanitary standards.

The operation of the main and auxiliary equipment is provided in automatic mode, therefore, the permanent presence of the duty personnel in the boiler room is not required.

Slab structures at elevation 27.650 and enclosing walls are designed based on the condition of acceptance of all loads from process equipment, pipelines and other boiler plant elements.

Window openings are equipped with nets to protect against glass scattering in case of an accident.

Equipment and pipelines are selected based on the condition of providing strength characteristics, both at operational parameters and at emergency pressure increase to the value of safety devices actuation. The medium is discharged from the safety devices outside the boiler room into the atmosphere (to a safe space).

The noise characteristics of the main and auxiliary equipment laid down in the design ensure the noise level up to the requirements of sanitary standards.

At the intersection of enclosing structures, pipelines are laid in casings made of non-combustible materials. Sealing of clearances between the sleeve and the pipeline shall be performed with non-combustible materials providing the rated fire resistance limit of the enclosing structures.

To create comfortable conditions in case of temporary stay of maintenance personnel in the boiler room, a ventilation and heating system is provided.

Design decisions on electrical safety were made in accordance with SNiP II3576, DNAOP 0.001.20-98.

To create the conditions for normal operation of maintenance and repair personnel, the project provides for appropriate systems and types of artificial lighting in the boiler room.

The gas supply system of water heating boilers is designed in accordance with the requirements of DNAOP 0.001.20-98.

In the boiler room, a system for monitoring the concentrations of natural and carbon monoxide in the air is installed, and in case of increasing the concentrations of natural gas to 1%, and carbon monoxide to 0.01%, the protective fast-acting valve at the gas pipeline inlet to the boiler room is automatically closed and a light-and-sound signal is sent to the duty personnel room (concierge room).

Automatic closing of the fast-acting shut-off valve at the gas pipeline inlet to the boiler house is also provided when the fire alarm system is activated, and when the power is cut off.

All data on boiler room equipment operation are transmitted to the control room (concierge room):

• equipment malfunctions (boiler emergency shutdown);

• failure of boiler house power supply;

• decrease of temperature in the boiler room below permissible (+ 5 ° С);

• pressure reduction signal in heating, ventilation and hot water supply systems;

• actuation of the gas content signal in the boiler room (natural and carbon monoxide gas);

• actuation of security alarm;

• fire alarm system actuation.

The operation of boiler units shall be organized as follows:

system of measures for operation of general technical equipment;

system of measures to ensure reliable operation of the boiler room.

1.2 Process automation

According to SNiP 2.04.0887, it is necessary to control the content of methane and carbon dioxide in the boiler room air, for this it is necessary to install a gas analyzer

STM-10-0002 (D) (B) (H) in the boiler room.

From the alarm unit of the gas analyzer, bring contact to the electromagnetic valve control circuit at gas supply to the boiler room for its closing at increased concentration of explosive mixture and contact to the connection box SK24 in the boiler room.

Collect the following signals on the junction box:

emergency shutdown of the boiler;

absence of boiler house power supply;

temperature decrease in the boiler room below (+ 5 0С);

reduction of pressure in heating system and GVA;

fire;

gas content of the boiler room.

Then use KVVG 41.5 cable to output one generalized signal to the room of the on-duty personnel, where to install a light annunciator and a sound roll to signal the boiler room operation mode violation.