RU2516114C1 - Automated system to control coolant flow rate for heat supply of group of loads - Google Patents

Abstract

FIELD: power engineering.

SUBSTANCE: control system includes a source of heat, supply and return pipelines, a unit of coolant flow rate control, comprising a flow rate controller and sensors of flow rate, temperature and pressure, installed on supply and return pipelines, a circulating pump, a heat energy processor, linked to sensors and the controller. To achieve the technical result, the unit of coolant flow rate control is equipped with sensors of temperature of external and internal air, at the same time the unit of coolant flow rate control, the circulating pump and the heat energy processor are installed on a load with higher thermal load, other loads of the system are equipped with sensors of coolant flow rate and sensors of internal air temperature, connected to the heat energy processor.

EFFECT: control of heat consumption of a group of loads without installation of a full complex of automatics devices with preservation of the temperature mode, which are connected to heat networks of buildings, which makes it possible to save capital costs, service costs, saving of thermal and electric energy.

1 dwg

Description

The invention relates to the field of power engineering, and can be used in district heating systems of dead-end heating networks.

A known system for regulating heat supply (see ed. Certificate of the USSR No. 1343196, IPC F24D 19/10, publ. 07.10.1987), containing temperature sensors in the supply and return pipelines and temperature sensors for outdoor and indoor air connected to the controller, controlling the actuator with an adjusting valve, the actuator is equipped with limit microswitches.

A heat supply control system is also known (see patent No. 2196274, IPC F24D 19/10, publ. 10.01.2003), including sensors for measuring the temperature of the coolant in the supply and return pipes, the temperature of the outdoor air and air inside the building, as well as a control valve, controlled by a regulator.

The disadvantages of these systems, in the case of the introduction of systems for consumer groups, is the need to implement a full range of automation devices for each of the consumers.

Technically close to the claimed regulation system is a heat supply regulation system (see utility model patent No. 15775, IPC F24D 19/10, publ. 10.11.2000), containing a heat source, supply and return pipelines of a closed heating network with drain feeds connected to them and return pipelines of heat supply for each of the consumers, a unit for measuring, metering and regulating the flow of coolant with flow, temperature and pressure sensors installed on the supply and return pipelines, flow regulators, pressure pressure and differential pressure, circulation pump, heat and power processor associated with sensors and regulators.

The disadvantages of this regulation system include the redundancy of regulation elements, the difficulty of accurately determining the required amount of heat for consumers due to the lack of sensors for indoor and outdoor air, as well as increased energy costs for the circulation pump drive.

The technical result achieved by the present invention is the ability to control the heat consumption of consumer groups without installing a full range of automation devices, subject to the temperature conditions connected to the heating networks of buildings.

The result is achieved in that an automated system for controlling the flow of heat carrier for heat supply to a group of consumers, containing a heat source, supply and return pipelines of a closed heat network with connected by-pass supply and return pipelines of heat supply for each of the consumers, a unit for regulating the flow of heat carrier, including a flow regulator and sensors flow, temperature and pressure installed on the supply and return pipelines, circulation pump, heat power project the quarrel associated with the sensors and the regulator is characterized in that the coolant flow control unit is equipped with external and internal air temperature sensors, while the coolant flow control unit, the circulation pump and the heat and power processor are installed on the consumer with the highest heat load (automated consumer), the rest of the system consumers (non-automated consumers) equipped with flow rate sensors and internal temperature sensors associated with the heat and power the cessor.

In FIG. The heat supply control system is depicted, where: 1 is a heat source, 2 is an automated consumer, 3 is a non-automated consumer, 4 is a heat and power processor (TEC), 5 is a supply pipe, 6 is a return pipe, 7 is a coolant flow sensor, 8 is a coolant flow controller 9 - a set of sensors for an automated consumer, including flow, temperature and pressure sensors, 10 - a circulation pump, 11 - an internal temperature sensor, 12 - an outdoor temperature sensor.

Automated regulatory system works as follows:

, определяемого следующим образом:When changing the environmental parameters in such a way that there is a need to increase the heat load of consumers, TEC 4 gives a signal to the flow regulator 8 to increase the flow of heat carrier to the automated consumer 2, which allows you to maintain the set internal temperature of the automated consumer 2, while at the same time, the non-automated consumer 3 begins to experience a shortage of thermal energy, which leads to a gradual decrease in its internal air temperature, monitored by a sensor 11. When the temperature of indoor air non-automated customer 3 to the lower set limit, TEP 4 gives a signal to a flow regulator 8 to reduce the coolant flow in the automated user 2, which leads to an increase in consumption by the consumer non-automated 3 by increasing the pressure in the heating system. The reduction in consumption for an automated consumer is performed until the consumption for a non-automated consumer 3 reaches the minimum required value

defined as follows:

;

;

where: Q - current heat consumption of the building (Gcal / h),

c is the heat capacity of the coolant (kcal / (kg · ° C)),

t _under. - current temperature in the supply pipe (° C),

t _arr. - current return temperature (° C).

The current heat consumption of the building is determined by:

;

;

where: Q _calc. - estimated heat consumption of the building (Gcal / h),

- расчетная температура внутреннего воздуха (°С),

- calculated internal air temperature (° C),

- расчетная температура наружного воздуха (°С),

- calculated outdoor temperature (° C),

t _n - current outdoor temperature (° C).

The current temperature t _{n are} monitored by TEC 4 using the sensor 12, the current temperature t t _arr. , t _under. - using a set of sensors 9.

, ТЭП 4 перестает подавать сигнал на регулятор расхода 8, тем самым стабилизируя систему, после чего начинается прогрев неавтоматизированного потребителя 3, а автоматизированный потребитель 2 постепенно охлаждается, расходуя аккумулированное тепло. Как только температура внутреннего воздуха неавтоматизированного потребителя 3 достигнет верхнего установленного предела, или температура внутреннего воздуха автоматизированного потребителя 2 опустится до нижнего установленного предела, ТЭП 4 возвращает систему в исходное состояние.Using the flow sensor 7, TEP 4 monitors the change in the flow rate to a non-automated consumer, after reaching a flow value equal to

, TEP 4 ceases to send a signal to the flow regulator 8, thereby stabilizing the system, after which the heating of the non-automated consumer 3 begins, and the automated consumer 2 gradually cools, consuming the accumulated heat. As soon as the temperature of the internal air of the automated consumer 3 reaches the upper set limit, or the temperature of the internal air of the automated consumer 2 drops to the lower set limit, TEC 4 returns the system to its original state.

Thus, the cycles of redistribution of expenses allow observing the temperature regime of consumers connected to the heating networks without installing additional control devices, which saves the capital costs of installing automation devices and the costs of their maintenance, as well as saving heat and electric energy.

Claims (1)

An automated coolant flow control system for heat supply for a group of consumers, containing a heat source, supply and return pipelines of a closed heat network with connected by-pass supply and return heat supply pipelines of each of the consumers, a coolant flow control unit, including a flow regulator and flow, temperature and pressure sensors installed on the supply and return pipelines, a circulation pump, a heat and power processor associated with sensors and a cooler, characterized in that the flow rate control unit is equipped with outdoor and indoor air temperature sensors, while the flow rate control unit, the circulation pump and the heat and power processor are installed on the consumer with the highest heat load, the rest of the system consumers are equipped with flow rate sensors and internal air temperature sensors, associated with a heat power processor.