RU2825920C1 - Heat carrier parameters control unit with automatic control system - Google Patents

Abstract

FIELD: heat power engineering.

SUBSTANCE: invention relates to heat engineering and can be used in heat supply systems of industrial buildings for automatic control of heat carrier parameters for one or more types of heat load (heating, ventilation, air conditioning, hot water supply). In the heat carrier parameters control unit with the automatic control system, the heating water supply pipeline contains a two-way control valve with an electric drive for the heat carrier supply to the main consumers, connected to the control cabinet, and the pipeline supplying the mixed heat carrier to the administrative and household premises contains a two-way control valve with an electric drive for supplying the heat carrier to additional consumers, connected to the control cabinet, wherein control cabinet allows automatic control of parameters of heat carrier supplied to consumers.

EFFECT: higher accuracy of obtaining heat carrier of specified parameters due to automatic control of heat carrier parameters for one or several types of heat load.

4 cl, 1 dwg

Description

Field of technology

The invention relates to the field of thermal power engineering and can be used in heat supply systems of industrial buildings for automatic regulation of heat carrier parameters for one or several types of heat load (heating, ventilation, air conditioning, hot water supply).

State of the art

A heating point is known, which includes supply and return pipelines of a heating network with inlet and outlet valves, respectively, and mud collectors, pressure gauges, thermometers and pressure regulators installed on these pipelines after the inlet and before the outlet valves, supply and return pipelines of a heat consumption system with outlet and inlet valves and pressure gauges and thermometers installed on these pipelines after the inlet and before the outlet valves, a mixing pipeline between the supply and return pipelines of the heating network, a self-excited hydraulic hammer generator, a check valve, a hydraulic accumulator and a thermal expansion valve with a temperature-sensitive element (RU patent No. 195018, published on 13.01.2020).

The reasons why it is impossible to achieve the technical result are the small range of regulation of the coolant parameters due to the use of a self-excited hydraulic shock generator and a mixing pump without a frequency-controlled drive for mixing the coolant from the return and supply pipelines and, as a consequence, the low reliability of the process of obtaining a coolant of specified parameters.

A device is known for regulating heat consumption for heating in heat supply systems, comprising feed and return pipelines, a jumper connecting the feed and return pipelines with a mixing pump, a heat consumption regulator for heating with sensors for the temperature of water for heating and the temperature of the outside air, a control valve with a drive in the feed pipeline, and characterized in that the heat consumption regulator for heating includes a recorder of the outside air temperature and a recorder of the temperature of water for heating, which are connected to the corresponding temperature sensors, wherein each of the temperature regulators contains comparison, setting and nonlinear feedback units, as well as electronic and magnetic amplifiers, in addition, the mixing pump is equipped with a drive with a rotation speed regulator and a control valve with a drive in the feed pipeline, equipped with a rotation speed regulator in the form of a block of powder electromagnetic clutches, wherein the magnetic amplifiers of the recorder of the outside air temperature and the recorder of the temperature of water for heating are electrically connected to the corresponding regulator of the rotation speed of the control valve and the mixing pump (patent RU No. 2485407, published 20.06.2013).

The reasons why it is impossible to achieve the technical result are the low reliability of the process of obtaining a heat carrier of the specified parameters due to the absence of a control valve and pressure sensors operating to maintain a specified pressure difference, and the absence of filters.

The closest technical solution to the claimed object is a device for regulating the temperature of water for heating systems, including a supply and return pipeline of a heating station, wherein on the supply pipeline of the heating station there are valves, a mud collector, a water-jet elevator, and on the return pipeline of the heating station - valves, a mud collector, a water meter, characterized in that after the water-jet elevator an additional supply pipeline is rigidly connected to the supply pipeline of the heating station at one end, and at the other end - to the main riser of the heating system, in addition, on the additional supply pipeline itself for the possibility of switching off, switching on and regulating the heating system the following are installed: valves, a flow regulator with an electric drive, a circulation-mixing pump and a check valve, and the return additional pipeline is connected at one end to the return pipeline of the heating station, and at the other - between the flow regulator and the circulation-mixing pump to the additional supply pipeline, in addition, on the specified The pipeline also has a check valve installed (RU patent No. 193051, published on 11.10.2019).

The reasons why it is impossible to achieve the technical result are the small range and low variability of the regulation of the coolant parameters due to the use of an elevator for mixing the coolant from the return and supply pipelines, operation during the heating period without the participation of a regulating valve (flow regulator) and, as a consequence, low reliability of the process of obtaining a coolant of specified parameters and high energy costs.

Revealing the essence

The technical problem solved by the claimed invention consists in increasing the reliability of the coolant parameter control unit.

The technical result consists in increasing the accuracy of the process of obtaining a heat carrier of specified parameters due to automatic regulation of the heat carrier parameters for one or several types of heat load.

The technical result is achieved in that in the coolant parameter control unit with the automatic control system, it comprises a heating water pipeline - a supply pipeline, with primary measuring transducers installed thereon for measuring the flow rate, pressure and temperature of the coolant, which are connected to the control cabinet; a heating water pipeline - supplying a mixed coolant to the main consumers, with primary measuring transducers installed thereon for measuring the pressure and temperature of the coolant, which are connected to the control cabinet; a heating water pipeline - supplying a mixed coolant to administrative and household premises, with primary measuring transducers installed thereon for measuring the pressure and temperature of the coolant, which are connected to the control cabinet; a bypass and a mixing pipeline for administrative and domestic premises, connecting the said heating water pipeline - supplying mixed heat carrier to the main consumers and the heating water pipeline - supplying mixed heat carrier to administrative and domestic premises, a heating water pipeline - return with primary measuring transducers installed thereon for measuring the flow rate, pressure and temperature of the heat carrier, which are connected to the control cabinet; a mixing pipeline connecting the said heating water supply pipeline and the heating water pipeline - return, and containing pressure measuring devices indicating with a contact device, and mixing and circulating pumps with frequency-controlled drives, connected to the control cabinet, and also designed with the possibility of automatically reproducible sequential operation; wherein said heating water supply pipeline contains a two-way regulating valve with an electric drive for supplying the heat carrier to the main consumers, connected to the control cabinet, and said heating water pipeline - supplying mixed heat carrier to administrative and household premises contains a two-way regulating valve with an electric drive for supplying the heat carrier to administrative and household premises, connected to the control cabinet, wherein the control cabinet is designed with the possibility of automatically regulating the parameters of the heat carrier that is supplied to consumers.

An additional feature is that the two-way control valve of the heating water supply pipeline is installed before the connection point of the mixing pipeline for administrative and domestic premises.

An additional feature is that the heating water supply pipeline additionally contains a balancing valve installed before the connection point of the bypass and the mixing pipeline for administrative and domestic premises.

An additional feature is that an outside air temperature sensor is additionally installed and connected to the control cabinet.

Description of drawings

Fig. 1 schematically shows the basic diagram of the coolant parameter control unit with an automatic control system, where:

1. heating water pipeline - supply;

2. heating water pipeline - supplying mixed heat carrier to the main consumers (to production facilities);

3 heating water pipeline - supplying mixed heat carrier to administrative and domestic premises;

4. heating water pipeline - return;

5. bypass;

6. mixing pipeline;

7. two-way control valve with electric drive for supplying coolant to main consumers (in production areas);

8. two-way control valve with electric drive for supplying coolant to administrative and domestic premises;

9. balancing valve;

10. mixing and circulation pumps with frequency-controlled drives;

11. rotary disc valves;

12. check valves;

13. valves;

14. filters;

15. primary measuring transducers for measuring pressure;

16. primary measuring transducers for temperature measurement;

17. pressure measuring devices indicating;

18. pressure measuring devices indicating with a contact device;

19. temperature measuring devices indicating;

20. primary measuring transducers for measuring the flow rate of the coolant;

21. outside air temperature sensor;

22. measuring transducer;

23. power cabinet;

24. control cabinet

25. mixing pipeline (for administrative and domestic premises).

The invention consists of a heating water pipeline 1 - supply; a heating water pipeline 2 - supplying mixed coolant to the main consumers (to production premises); a heating water pipeline 3 - supplying mixed coolant to administrative and household premises; a heating water pipeline 4 - return; a bypass 5; a mixing pipeline 6; a two-way regulating valve 7 with an electric drive for supplying coolant to the main consumers (to production premises); a two-way regulating valve 8 with an electric drive for supplying coolant to administrative and household premises; a balancing valve 9; mixing and circulating pumps 10 with frequency-controlled drives; rotary disk valves 11; check valves 12; gate valves 13; filters 14; primary measuring transducers for measuring pressure 15; primary measuring transducers for measuring temperature 16; indicating pressure measuring devices 17; pressure measuring devices indicating with a contact device 18; temperature measuring devices indicating 19; primary measuring transducers for measuring the flow rate of the coolant 20; outside air temperature sensor 21; measuring transducer 22; power cabinet 23; control cabinet 24; mixing pipeline (for administrative and household premises) 25.

Implementation of the invention

The device works as follows.

Automatic regulation of the coolant parameters for one or several types of heat load is carried out in the following way. The heat carrier (water) from the heating network enters the heating water pipeline 1 (supply) of the heat carrier parameter control unit with an automatic control system with a certain heat carrier temperature provided by the heat source according to the schedule, passing through the valve 13 and the primary measuring transducer for measuring the heat carrier flow 20, installed on the heating water pipeline, and enters the two-way regulating valve 7 with an electric drive for supplying the heat carrier to the main consumers (to production premises), the degree of opening of which for maintaining the specified pressure difference between the heating water supply pipeline 1 and the heating water return pipeline 2 is determined by the control cabinet 24, based on the signals of the primary pressure measuring transducers 15, installed on the heating water pipelines 1 (supply), heating water 2 (supplying the mixed heat carrier to the main consumers) and the heating water pipeline 4 (return). The set value of the circuit pressure difference is calculated according to the specified pressure difference schedule. To increase the reliability of operation, a limitation is provided for the minimum degree of valve opening, and the valve is automatically fully opened in the event of an emergency threat of freezing, a break in the primary measuring transducer for measuring the pressure on the heating water pipeline 2 or 3 or the primary measuring transducer for measuring the temperature on the return pipeline 4, a lack of voltage in the electrical network, when the general emergency stop button is pressed on the control cabinet 24 or the power cabinet 23.

Then, the heat carrier from the return pipeline 4 is mixed into the heating water supply pipeline 1 and the temperature of the heat carrier is regulated using the mixing and circulating pumps 10 installed on the mixing pipeline 6. The pumps 10 operate with frequency-controlled drives, and the frequency of the current supplied to the electric motors of the pumps 10 is regulated by the control cabinet 24 based on signals from the outside air temperature sensor 21 and the primary measuring transducers for measuring temperature 16, thereby regulating the amount of mixed water and maintaining the set value of the heat carrier temperature in the circuit, calculated according to the specified temperature graph depending on the outside air temperature. Then the water enters the heating water pipeline 2 (supplying the mixed heat carrier to the main consumers). In order to increase the reliability of the process of obtaining the heat carrier of the specified parameters, it is also provided to regulate the frequency of the pumps 10 in the case when the pressure drop in the circuit is below half of the set value and the degree of opening of the two-way regulating valve 7 is maximum, to increase the pressure drop. Also, to increase the reliability of operation and ease of use, it is provided for automatically reproducible alternate operation of the pumps 10 in cases when the operation of one pump is sufficient to maintain the required pressure drop, and in the event of a failure of the frequency-controlled drive, pressing the emergency stop button on the push-button post, pressing the general emergency stop button on the control cabinet 24 or on the power cabinet 23, lack of voltage in the electrical network, contamination of filters 14 (according to the readings of pressure measuring devices showing with the contact device 18) or low pressure in the return pipeline 4 (according to the readings of the primary measuring transducer for measuring pressure 15 - less than 0.1 bar) the pumps 10 cannot be started. The mixing water enters through the mixing pipeline 6, passing through the rotary disc valves 11, hydraulic filters 14, check valves 12, which prevent the coolant from moving in the opposite direction through the mixing pipeline 6, and gate valves 13. Hydraulic filters 14 provide protection for the impeller of the pumps 10 from foreign objects and contamination.

Part of the heat carrier before the two-way regulating valve 7 (for supplying the heat carrier to the main consumers) is sent to the balancing valve 9 and then to the two-way regulating valve 8, the degree of opening of which is automatically set by the control cabinet 24 based on the readings of the pressure measuring transducers 15, the temperature measuring transducers 16 and the outside air temperature sensor 21, based on the specified temperature graph. In order to increase the reliability of the individual heating point, a pressure reduction is provided by the regulating valve 8 in the event that the pressure in the pipeline 3 exceeds the specified permissible value. After the regulating valve 8, water from the pipeline 2 is mixed with the heat carrier in the pipeline 3 through the mixing pipeline 25, containing the check valve 12 and the shutter 11.

Then the heat carrier from pipeline 2 is directed to the main heat consumers (for servicing production facilities), and the heat carrier from pipeline 3 is directed to the heat needs of administrative and domestic premises. After passing the consumers, the heat carrier is directed to the return pipeline 4 and then from the individual heating point, passing through valve 13 and the primary measuring transducer for measuring the flow rate of the heat carrier 20. The signal from the transducers for measuring the flow rate of the heat carrier 20 is directed to the measuring transducer 22, and then, for ease of operation, to the control cabinet 24, where the data is available for review on a special visualization panel.

To improve ease of use, pressure measuring devices 17 and temperature measuring devices 19 are installed on the supply, return and mixing pipelines.

If the outside air temperature is equal to or below 0 °C and the water temperature in the return pipeline 4 is below the set emergency temperature, then the freeze protection mode is automatically activated: pumps 10 are switched off, the control valve 7 is fully opened, an emergency signal is sent to the visualization panel and, if available, to the dispatching system.

Claims (4)

1. A heat carrier parameter control unit with an automatic control system, comprising a heating water pipeline - supply (1), with primary measuring transducers installed thereon for measuring the flow rate, pressure and temperature of the heat carrier, which are connected to a control cabinet; a heating water pipeline - supplying mixed heat carrier to the main consumers (2), with primary measuring transducers installed thereon for measuring the pressure and temperature of the heat carrier, which are connected to a control cabinet; a heating water pipeline - supplying mixed heat carrier, supplying mixed heat carrier to administrative and household premises (3), with primary measuring transducers installed thereon for measuring the pressure and temperature of the heat carrier, which are connected to a control cabinet; a bypass and a mixing pipeline for administrative and domestic premises (25) connecting the said heating water pipeline supplying mixed heat carrier to the main consumers (2) and the heating water pipeline supplying mixed heat carrier to administrative and domestic premises (3), a heating water return pipeline (4) with primary measuring transducers installed thereon for measuring the flow rate, pressure and temperature of the heat carrier, which are connected to the control cabinet; a mixing pipeline (6) connecting the said heating water supply pipeline (1) and heating water return pipeline (4), and containing pressure measuring devices indicating, with a contact device, and mixing and circulating pumps with frequency-controlled drives, connected to the control cabinet, and also designed with the possibility of automatically reproducible sequential operation; wherein the said heating water supply pipeline (1) contains a two-way regulating valve with an electric drive for supplying the heat carrier to the main consumers, connected to the control cabinet, and the said heating water pipeline - supplying the mixed heat carrier to the administrative and household premises (3) contains a two-way regulating valve with an electric drive for supplying the heat carrier to the administrative and household premises, connected to the control cabinet, wherein the control cabinet is designed with the possibility of automatically regulating the parameters of the heat carrier supplied to consumers. 2. The unit according to item 1, characterized in that the two-way control valve of the heating water pipeline (supply) is placed in the following manner: the two-way control valve of the heating water pipeline (supply) is installed before the connection point of the mixing pipeline for administrative and household premises. 3. The unit according to item 1, characterized in that the heating water supply pipeline additionally contains a balancing valve installed in the following manner: before the connection point of the bypass and the mixing pipeline for administrative and domestic premises. 4. The unit according to item 1, characterized in that it additionally contains an outside air temperature sensor connected to the control cabinet.