SU1702942A1 - Green house complex heating system - Google Patents

Abstract

The invention relates to agriculture and construction, to the field of heat supply for consumers of various national and national importance, in particular greenhouse blocks from the central boiler house. The purpose of the invention is to increase the operational reliability of the system. If the source heat does not match the source 1, the loss of greenhouses 8, the overflow plunger 4 and throttling B control valves and control units 6 can be placed in such a way that the flow of heat carrier in the heating circuits 7 is lower than the permissible heat supply source 1, or (and) raise the temperature of the heating water downstream of the connection point of the relief valve 4 to the discharge pipe 3 to the temperature at which the vaporization starts at the current value of the overpressure, or (and) decrease to phenomenon in the supply pipeline 2 to the heat input below the permissible conditions for beginning the steam in the superheated coolant. In these cases, using functional blocks 16 and a threshold device 17, based on the signals from temperature sensors 13, pressure 14 and flow rate 15, actuator circuits 9 of throughput 4 and throttling 5 valves and units 6 for controlling the thermal power of heating circuits 7 are connected to open or close the actuators 9. Thus, the given structure of the heat supply system of the greenhouse complex eliminates emergency situations in its work, provides an increase in operational reliability STI. 1 silt, eaten with Nf O 1H O Jv N

Description

The invention relates to agriculture and construction, to the field of heat and gas consumers of various national economic purposes, the authority of greenhouse blocks from the central boiler house .. ..- ......

The aim of the invention is to increase the operational reliability of the system ./L; lını ::: th - - -: -. .

The diagram of the heat supply system of the greenhouse heating plant is presented on this site. The heat supply system of the greenhouse complex contains a source of heat 1, connected to it by the supply 2 and the outlet. 3 heat carrier pipelines, thermal input of the greenhouse block with alternately connected bypass 4 and throttling regulating valves b, alternately connected after the thermal roof, thermal power control units 6; Circuits 7 for heating greenhouses 8 (for example, two greenhouses 8 are shown), bypass and throttling 5 regulator; control valves and adjustment knots 6

Thermal power of heating greenhouse circuits 7 is equipped with electric mechanisms 9 with them connected and parallel circuit disconnecting devices installed (control ot pbifime 10 and closing 11 unestablIe mechanisms 9; their inputs are connected to the outputs of regulators 12 corresponding control valves Iuzloz 6 controls the thermal power of the circuits 7 for heating greenhouses 8, two temperature sensors 13 and two pressure sensors 14 / and the first temperature sensors 13 and dz enm 14 are set.

 On the supply pipe 2 are installed before the heat inputs, and the second ones are on the discharge pipe 3 of the greenhouse block 8, the heat flow sensor 15 installed on the discharge pipe of the 3rd heat supply T, two functional chambers of the chapters; of which the poik / t is more than) Hi k to the outputs of the first temperature sensors 13 and pressure 14, and the second to the outputs of the second temperature sensors 13 and pressure 14. on the horny device 17, the output input with the output of the flow sensor 15, and; output the first functional unit Full construction But to the inputs of the shutdown devices 10, control the opening of the actuators 9 of the control valves and the thermal power control units of the heating circuits 7 of the greenhouses B, and the output of the second Function block 16 is connected to the input of the device 10 disconnected control circuits from the yard of 1 ml; y: E | mechanism 9 bypass pn / mipy tdtiicr6

valve 4 and with the inputs of the disconnection control devices 11 of the closing mechanisms of the actuators 9 of the throttling regulating valve 5 and the thermal power control units b of the heating circuits 7 for heating the greenhouses 8, and the output of the threshold unit 17 is connected to the devices 11 of the closing control circuits of the actuators 9 of the control valves and nodes b control thermal power contours 7 heating greenhouses 8l

The signal at the output of the functional unit 16 (the output signal of this unit

is the state - open or closed - chickpeas - contact groups) appears when the signal (or several signals) at the input of the function block reaches the threshold value. Value

a signal at the input of a function block 16 at which an output signal appears (changing the state of a group of contacts

output relay) is controlled by a threshold value setpoint device built into the device.

The MaTeMaTH4eckafl formula for the functioning of this functional block 16 is as follows: -

thirty

Y sing (Ј-0-Kp Р).

where Y is the output signal of block 16, which may be equal to or O - contact open. or contacts are closed;

sing - jump function; Q, Kp are the coefficients determined from the table of saturated water vapor; -water temperature;

P-water pressure ..

The system works as follows. If the heat supplied by the heat supply source .1 corresponds to the heat sink of the greenhouses 8, the plunger of both the regulating overflow 4 and the throttling 5 valves and the regulating valves of the nodes 6 for controlling the heat output of the contours 7 of the greenhouse heating 8 are in the operating range. This ensures the estimated consumption of heating water in the supply 2 and outlet 3 pipelines, which eliminates its boiling up in the water heaters of the heat supply source 1.

The pressure in the supply pipe 2 before thermal input above the critical, which also eliminates boiling

overheated coolant. Bypass

valve 4 in this sit-ution bypasses such

part of the coolant in the discharge pipe 3, which when displaced with the exhaust

heat; damper, does not raise its tempera. TURU is higher than critical boiling point, for the current value of the excess pressure in the discharge pipe 3. before the thermal inlet.

When reducing the heat loss of greenhouses 8, the regulators 12 of the throttling valve 5 and the thermal power control units 6, with any of the possible algorithms, their functioning decreases

The flow of heat carrier for heating greenhouses 8. In turn, the recuperator 12 of lerip regulating valve 4 also, regardless of the algorithm of its operation in order to reduce the consumption of heat carrier in circuits 7 of heating of greenhouses 8, will increase the amount of bypassing heat carrier from the supply 2 to the outlet 3 pipelines before thermal output. Thus, the decrease in heat loss of greenhouses 8 is accompanied by a decrease in the flow rate of the heat transfer medium in the supply 2 and discharge 3 pipelines and (or) an increase in the temperature in the discharge pipe 3 beyond the point of connection of the control valve to it 4. In case of a decrease in the coolant flow rate, c. feed pipe 2 and discharge pipe 3 below the boiling condition permitted, the threshold device 17 will turn on and will send a signal to the device 11 to turn off the control mechanisms for closing the actuators 9, which will break the chains that control the closing of the actuators 9 of the throttling control valve 5 and the adjustment units 6 . Thus, the further closure of the throttling regulating

: valve 5 and adjustment knots 6, and trace. Consequently, a further decrease in the flow rate of the heat carrier from the heat supply source 1, which can lead to the occurrence of a -, -. „; emergency situation. But at the same time With this, due to the operation of the regulator 12 of the relief-regulating valve 4., the temperature of the body of the carrier behind the point of displacement may rise above the permissible level at the current pressure value. In that . on the basis of signals from temperature transmitters 13 and pressure 14, the functional unit 16 will give a signal to device 10 from; control circuit opening control actuators that are. break the chains controlling the opening of the actuator 9 bypass. a control valve 4, and a switch-off control device 10 for the opening of the actuators 9 of the throttling valve 5 and the control units 6, which will break the chains controlling the closing of the actuators.

the throttling valve 5 and the adjustment units 6, since their further closure will cause an increase in the flow of hot coolant through the control valve 4, with the former position of its plunger.

With increasing heat loss of greenhouses 8 regulators 12 throttling. control valve 5 and units b for adjusting the thermal power of the contours of heating the greenhouses 7 will increase the flow rate of the heat carrier for heating the greenhouses 8, which will cause a decrease in the overpressure in the supply pipe 2 in front of the heat supply. V if this causes a decrease in pressure below the permissible level, at the current temperature of the coolant, a function block 16 connected to the temperature sensors 13 and pressure 14,

0 installed on the supply pipe 2, will signal the opening circuit 10 of the opening control actuators 9, which will break the chains controlling the opening of the actuating mechanisms 9 bypass 4 and the throttling 5 control valves and heat capacity control units 6, since the further operation of the actuators 9 towards the open

0 may cause an emergency.

The system returns to its original state automatically after the heat supply source 1 switches to another mode, which allows to compensate for the heat loss of greenhouses 8 without creating an emergency situation. For example, after reducing heat losses, the heat supply source 1 will decrease the temperature of the heat transfer medium in the supply pipe 2,

0 which will lead to the return of the plungers of the bypass 4 and throttling 5 valves and adjustment units 6 to the operating range, since to ensure the same performance of the heating system circuits 7 8

5 at a lower temperature, a greater flow rate of heat carrier is required.

As functional blocks 16 and the threshold device 17 can be used, for example, corrective

0 K26 instruments designed to signal limit values of parameters with standard analog input signals from temperature sensors, pressure sensors, and flow sensors.

5 The output signal of the correction devices is the state of their output contacts, which can be used as devices for opening control circuits opening 10 and closing 11 of the actuators 9. In this case.

normally closed contacts K26 are connected between the corresponding output of the regulator 12 and the corresponding input of the actuator 9. When using K2b as the threshold device 17. The flow sensor 15 and the switch-off threshold of its contacts connected to the circuit of the corresponding actuator are connected to it. The mouth knows with the help of the sensor built into it. When using K2b as a fuction unit 16, it is connected to it. pressure sensors 14 and temperatures 13 in such a way that their signals are summed up with corresponding weighting factors determined on the basis of a table of saturated water vapor. As regulators 12, regulators of the type P25 / a can be used in the US; d | conventional mechanisms are MEO. , .1: ..- In the quality of devices for opening control circuit disconnection. 10 and closing 11 versions: mechanisms 9 can be used contact and contactless

KEYS. K: l -. -:: .....

In the first case, the contacts are used as Keys. Signals to turn on are fed from functional blocks 16. In the second case, for example, these are thyristor key 6 amplitude controlled. -.-.-. . ; .-. -V Thus, the given construction is; The heating system of the greenhouse combines to exclude emergencies, which will increase the reliability of the heat supply of the greenhouse plant. .

Form m l l a and z s ro rete n and and; 7

The heat supply system of the heating plant, containing the heat supply source, communicated through the supply and discharge pipelines with thermal input of the greenhouse block, which includes the bypass and throttling: the switchboard valve with a suitable gear line with a line of gear lines and a line of gas lines. the greenhouses connected to the supply and discharge pipelines after the heat input of 6ndk3 heat energy through the thermal power control units with the appropriate powers: actuators and regulators, the first sensor The temperature of the heat medium mounted on the draining line between the heat source and the heat supplying

the input of the greenhouse block, and the flow sensor, o.t.t.p, which is intended to increase the operational reliability of the system, it is equipped with a second heat transfer temperature sensor installed on the supply pipe between the heat supply and heat

entering the greenhouse block, two pressure sensors located respectively on

supply and discharge pipelines

between the source of geplosnaya, bzheni and thermal input of the greenhouse block, two functional blocks, the inputs of which are connected to the outputs of the corresponding temperature and pressure sensors and devices for switching off control circuits, respectively, by opening and closing the actuators, the first inputs of which are connected to the outputs of the corresponding regulators, and the outputs to the control inputs

corresponding actuators, with the flow sensor installed on the exhaust pipe between the heat supply source and the thermal input of the greenhouse unit, and its output through the threshold unit

connected to the second inputs of the devices for disconnecting the control circuits by closing the execution mechanisms, the output

the first function block is connected

to the combined inputs of the device for disconnecting the control circuits by opening the executive mechanisms of the thermal power control unit, the throttling control valve and the first input of the control circuit disconnecting device

opening the actuator of the bypass control valve, and the output of the second functional unit

connects to one of the input inputs of control circuit disconnect devices

the opening of the actuating mechanism of the regulating control valve, the devices for switching off the control circuits by closing the actuators of the throttling control valve

and thermal power control units.

Claims (1)

SUMMARY OF THE INVENTION A heat supply system for a greenhouse plant comprising a heat supply source communicated through supply and 40 exhaust pipelines with heat input to the greenhouse block. ”Which includes bypass and throttling control“ valves with appropriate actuating mechanisms and regulators, and 45 greenhouses heating connected to the supply and discharge pipelines' after the thermal input of the unit through. thermal power control units with corresponding actuating mechanisms and regulators, the first coolant temperature sensor installed on the outlet pipe between the heat supply source and the heat input of the greenhouse block, and the flow sensor, about τη and tagging, which * £ is aimed at increasing the system operational reliability , it is equipped with a second coolant temperature sensor mounted on the supply pipe between the heat supply source and the heat input of the greenhouse block, two pressure sensors, laid respectively on the supply and outlet pipelines between the source of heat supply and the thermal input of the greenhouse block, two functional blocks, the inputs of which are connected to the outputs of the corresponding temperature and pressure sensors and the disconnecting devices of the control circuits, respectively, by opening and closing the actuators, the first inputs of which are connected to the outputs of the corresponding regulators, and the outputs - to the control inputs of 25 relevant actuators, while the flow sensor is installed on the lead pipe between the heat supply source by the thermal input of the greenhouse block, and its output through the threshold block is connected to the second inputs of the closing devices for closing the control circuits of the actuators, the output of the first functional block connected to the combined inputs of the disconnecting devices of the switching circuits for opening the actuators for opening the thermal control units, throttle control valve and the first input of the device for disconnecting the control circuits of the opening of the actuating mechanism ISM bypass control valve, and the output of the second functional unit is connected to the combined second Input- '·' s devices for disconnecting control circuits. by opening the actuator of the bypass control valve, devices for disconnecting the control circuits by closing the actuators of the throttling control valve and units for regulating thermal power. .1 · /