SU1725019A1 - Method and system for controlling heat output of heat supply boiler - Google Patents

Abstract

The invention relates to the regulation of the heating capacity of heating boilers with a water intake to the hot water supply and allows increasing the reliability and efficiency of the system. Three regulators 5-7, a valve control block 8, a summation block 9, a subtraction block 10, a block 11 are entered into the control system.

Description

differentiation, sensor 12, total fuel consumption, switch 13, null organ 14, memory block 15, and boiler load controller 16. When boilers start 29, fuel supply valves 3 open up until the signal from sensor 12 at the second regulator input The torus 16 of the boiler room load is not compared in magnitude with the signal at its first input. At this point, the initial installation of the fuel supply valves 3 is completed. Further, the position of the valves 3 is adjusted 1-2 times per day according to the signal received from the switch 1.3 through the memory block 15 to the third input of the summation block 9. This signal is given at times when the rate of change of water level in battery tank 1 is close to zero, and the magnitude of this signal is proportional to the difference between the actual and predicted water levels in tank 1. With this signal, valves 3 are set to any position in the zone maximum efficiency. Reliability and efficiency of operation of the boiler house is increased by reducing the frequency of switching valves 3. 2 sec. f-ly, 2 ill.

The invention relates to the regulation of the heating capacity of heating boilers with direct water intake to the hot water supply.

The aim of the invention is to increase the reliability, efficiency and increase the service life of the equipment.

Figure 1 shows the structural scheme of the heating capacity control system of a heating boiler house that implements the proposed method; figure 2 - timing charts of the system.

The heating capacity regulation system of a heating boiler house with an accumulator tank 1 contains a water level sensor 2 in the accumulator tank 1, control valves 3 for fuel consumption installed on the fuel lines 4, first setting device 5, second setting device 6, third setting device 7, valve control unit 8 3, a summation unit 9, a subtraction unit 10, a differentiation unit 11, a total fuel consumption sensor 12, a switch 13, a null organ 14, a memory block 15 and a boiler room load controller 16.

The first setting device 5 and the second setting device 6 are connected respectively to the first and second inputs of the summation unit 9, which is connected via the load controller 16 to the control unit 8 for controlling the fuel consumption control valves 3. A sensor 12 for the total fuel consumption is connected to the second input of the load controller 16. A subtraction unit 10 connected to a third setter 7, an output through a switch 13 and a memory unit 15 is connected to the third input of the summation unit 9, and a water level sensor 2 in the storage tank 1 is connected to the input of the differentiation unit 11 and to the second input of the unit A subtraction maintenance, wherein the output of the differentiation unit 11 through the null organ 14 is connected to the second input of the switch 13. The heating boiler contains a heat exchanger 17, the heater 18 is crude

water and deaerator 19, sequentially connected by pipe 20, and between the preheater 18 raw water and deaerator 19 has a control valve 21 for deaerated water,

Via a series-connected heat exchanger 17, a transfer pump 22 with a check valve 23 and a water level control valve 24 in the deaerator 19, the pipe 25 connects the outlet of the deaerator 19 s

the inlet of the storage tank 1, the outlet of which is connected to the reverse heating network through the feed pump 26 and the feed regulator 27; connected to the deaerator 19 and through the controller 32 of the temperature of the raw water is connected to the heater 18 raw water.

Automatic control of the steam pressure in the collecting steam manifold 30 is carried out by changing the flow rate of raw water to the deaerator using the regulator

21, as a result of which the steam consumption for the whole heating-deaerator installation changes with the help of regulators 31 and 32. At the same time, regulator 31 changes steam consumption in such a way that pressure in deaerator IV remains constant, and controller 32 changes the steam flow to the preheater 18 to maintain the temperature of the water entering the deaerator 19, the automatic regulation of the water level in the deaerator is performed by the control valve 24 by changing the water flow from

deaerator 19 into the accumulator tank 1. The regulator 27 provides the required flow of water from the accumulator tank 1 to the feed of the heating network 28 under the condition that the water pressure in the return pipe of the heating network 28 is maintained. The load of the steam boilers 29 is changed using valves 3 depending on signals produced by the control system.

During the adjustment cycle, the water level in the battery tank 1 varies from the minimum to the maximum allowed, limited to the working volume of the battery tank. At the beginning of the regulation cycle, when the water level in the accumulator tank 1 is minimum, namely, at the time of the discharge of the accumulator tank, determined on the basis of statistical processing of data on the water flow rate, the first, second and third set points are started by the operator 5.6 and 7. Before starting work, diagrams of changes in heat output during the period of charging and discharging the accumulator tank 1 are laid out, corresponding to the average water consumption for feeding QF and the average rate of change of water level in acc mule Thorne tank 1 Qv, and variable assignment in the level for the same time period. The signals from the output of the first and second setters 5 and 6 are received respectively at the first and second inputs of summation unit 9. At the initial moment of time, the current water level of Ntek in the battery tank is minimum and equal to the variable reference level in the third unit 7, therefore the signal arriving at the third input of summation unit 9 is zero at this moment. A signal from the output of block 9 summation, proportional to the value of the specified thermal performance (load boiler QJ, Fig.2), corresponding to the average water consumption for make-up QF and the average rate of change of the level Qv in the battery tank 1 during the charging period of the battery tank 1, arrives at the first driver input of the controller 16. At the same time, the signal from the fuel consumption sensor 12 to the second input (feedback input) of the controller 16 is zero at the initial moment of time. Thus, at the output of the regulator 16, a More signal appears, during which the valve and boiler control unit 8 generates output signals that trigger the boilers 29 and set the valves 3 to the initial positions at which the boilers operate in the optimum efficiency zone, and the total load of the boilers corresponds to the specified top performance of the boiler house (O, Fig.2). After starting the first boiler, the fuel consumption starts to change and appears

5 signal at the second input of the regulator 16. When the magnitude of this signal becomes a ramp signal at the first input of the controller 16 of the load of the boiler room, the signal More output disappears and the installation of the valves R

0 initial positions ends. As a result, the total heat capacity of the steam boilers corresponds to the sum of the average water consumption for feeding QF and the deluge of filling rate of the storage tank Qv with increasing water level Ntek in the storage tank. The signal that characterizes the water level in the battery tank Ntek. from the level 2 sensor comes simultaneously to the second

0 input of subtraction unit 10 and input of differentiation unit 11. Differentiated

block-11 signal (-tgr) - characterizing the rate of change of the current

Level 5 in the battery tank is fed to the input of the zero-body 14, which compares the input signal with a certain value equal to the dead zone d, and generates a discrete signal Ua at the output

0 This signal controls the switch 13 and permits the passage through the switch of a signal proportional to the mismatch of the current and specified levels of DNs, only at those times when the rate of change5 of the current water level in the battery tank is zero. This minimizes the number of switching valves and boilers, which reduces the operating time of boilers in transient conditions.

0 The switch 13 at the specified time instant connects the error signal, proportional to the DN, to the input of the memory block 15. A signal proportional to the level mismatch comes from the output

5 block 15 of memory with the opposite sign to the third input of block 9 summation. The adjusted reference signal, proportional to the output QJ.C output of the summation unit 9, is fed to the first input.

0 controller 16 load boiler. Depending on the difference between the signals at the first and second inputs of the regulator 16, a Less or More signal appears at its output, as a result of which the valve control unit 8 generates output signals that set valves 3 to new positions in the zone of optimum efficiency the next time the task changes.

F o rumlula and z o breetn

1. A method for controlling the heat output of a heating boiler house equipped with battery tanks by discretely varying the fuel consumption to the boilers, including regulating the supply of raw water to the thermal atmospheric deaerators according to the pressure in the combined steam collector, which is - that. in order to increase the reliability, efficiency and increase the service life of the equipment, they set the thermal performance corresponding to the average water consumption for recharge during the charging and discharging period of the battery tanks, summed up with the specified heat output corresponding to the average rate of change of the water level in the battery the tank and the amount obtained is used for the initial setting of the fuel consumption control valves, after which the times at which the rate of change of water level in the battery is determined the tank is close to zero and at these times the difference is determined between the actual and the predicted levels of water, for this difference is corrected position regulating fuel supply valve,

2. The system for regulating the heat output of the heating boiler,

having at least one battery tank containing a water level sensor in the battery tank and fuel flow control valves installed

on fuel lines, characterized in that, in order to increase reliability, efficiency and increase equipment service life, the system further comprises first, second and third

control devices, valve control unit, summation unit, subtraction unit, differentiation unit, total fuel consumption sensor, switchboard, null organ, memory unit and boiler room load controller, the first and second setters being connected to the first and second summation unit, respectively connected through the load controller of the boiler room with the control unit regulating

fuel consumption valves, a sensor is connected to the second input of the load controller

total fuel consumption, while the unit

subtraction, input connected to the third setpoint, output through the switch and the unit

the memory is connected to the third input of the summation unit, and the water level sensor in the battery tank is connected to the input of the differentiation unit and to the second input of the subtraction unit, and the output of the differentiation unit is connected to the second input of the switch through the null organ.

0

Zj

Editor M. Yankovich

ftn.2

Compiled by P. Kalita Tehred M. Morgental

Vp

Proofreader S.Shevkun

Claims (2)

Claim. 1. A method of regulating the heating capacity of a heating boiler equipped with battery tanks by discrete changes in fuel consumption to boilers, including regulating the supply of raw water to thermal atmospheric deaerators by the pressure in the combined steam collector, so on and so on. , what. in order to increase the reliability, economy and increase the service life of the equipment, they set the heat output corresponding to the average water consumption for recharge for the period of charging and discharging the battery tanks, summarize with the given heat output corresponding to the average rate of change of the water level in the battery tank and use the amount obtained for the initial installation fuel flow control valves, after which time points are determined at which the rate of change of the water level in the battery tank is close to zero and at these times, the difference between the actual and the predicted water level, this difference is corrected position regulating fuel supply valves. 2. The system of regulation of the heating capacity of the heating boiler, which has at least one battery tank, containing a water level sensor in the battery tank and fuel flow control valves installed on the fuel lines, characterized in that, in order to increase reliability, efficiency and increase the service life of the equipment , the system additionally contains first, second and third adjusters, a valve control unit, a summing unit, a subtraction unit, a differentiation unit, a total fuel flow sensor VA, a switch, a zero-organ, a memory unit and a boiler load regulator, with the first and second switches connected respectively. to the first and second inputs of the summing unit, connected through the boiler load regulator to the control unit for the fuel flow control valves, the total fuel consumption sensor is connected to the second input of the load regulator, while the subtraction unit, the input connected to the third switch, the output through the switch and the memory block is connected to the third input of the summing unit, and the water level sensor in the battery tank is connected to the input of the differentiation unit and to the second input of the subtraction unit, and the output of the differential unit A null-organ is connected to the second input of the switch. Qf Q _v ΔΗ A dH dt τ PT 01 ' Qa “n ppp π ηηππ n p n pppp η ππ η π π - IΈη \ ow >> . Editor M. Jankovic Figure 2