KR960004853B1 - Combustion control device for boiler - Google Patents

Abstract

The combustion control method includes the step of running the boiler normally for a time(t1) at a set temperature(Tset). A microcomputer compares the set temperature(Tset) with the output temperature(Tout). If the set temperature(Tset) is higher than the output temperature(Tout), the combustion operation unit(103) starts to decrease the opening ratio of gas valve and the speed of air blower by force. The microcomputer compares the output temperature(Tout) with the temperature(Tset) continuously, thereby controls the combustion in case of low gas state.

Description

Combustion control method and apparatus therefor when gas quantity is insufficient in LPG gas boiler

1 is a block diagram of a device of the present invention.

2 is a schematic configuration diagram of a gas boiler to which the present invention is applied.

3 is a flowchart for explaining the method of the present invention.

* Explanation of symbols for main parts of the drawings

1: temperature detector 3: data transceiver

4 gas valve control unit 5 blower control unit

10: control unit 11: manual operation device

101: tapping temperature recognition unit 102: time management and temperature comparison unit

103: combustion operation driving unit 104: combustion operation execution unit

105: combustion duration control unit 107: functional part control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control method and apparatus therefor when gas is insufficient in a gas boiler using LPG gas, and in particular, gas vaporization due to cooling of a gas tank (cylinder) during operation of a gas boiler in midwinter. Combustion control method in case of insufficient gas amount in LPG gas boiler which prevents incomplete combustion and 'off' of combustion caused by Flame Lifting phenomenon caused by insufficient amount of gas vaporization Relates to a device.

In most conventional gas boilers, regardless of the gas vaporization of the gas tank, the current supply temperature and the user's set temperature are compared with each other to supply and shut off the gas, or to control the amount of gas by controlling the gas volume proportionally. Even if the amount of vaporization of the gas is insufficient, there is a problem such as incomplete combustion or 'off' combustion due to unbalance of the blower's blower and gas supply amount due to the normal rotation of the blower or the change of the gas valve.

Therefore, a technical means to solve this problem is Japanese Patent Application No. 62-42206, which detects the gas pressure through the supply gas pressure sensor and shifts down the output of the combustion air supply means at a constant rate when it reaches a certain value or less. Is adopted.

However, such a device is configured to manually operate the driving device when the output value of the supply gas pressure lowered from the supply gas pressure sensor is input to the operation control unit, and thus it is impossible to completely prevent incomplete combustion due to the combustion phenomenon. Of course, the production cost of the product is increased, and there is a problem that the gas supply amount is not controlled at all according to the tapping temperature compared to the set temperature.

An object of the present invention is to compare the user's set temperature with the current tapping temperature when the boiler is burned according to the set temperature, and detect the gas shortage condition so that the tapping temperature is increased even though a predetermined time has elapsed in the normal operation state. LPG gas boiler that can prevent incomplete combustion due to insufficient amount of gas vaporization by periodically forcibly reducing the amount of change of gas valve and rotation speed of blower if it fails to reach the set value. The present invention provides a combustion control method and apparatus therefor when gas is insufficient.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Gas boiler 100 to which the present invention is applied, as shown in Figure 2, the manual control device 11 is installed in the casing 101 connected to the outside control unit 10 for controlling the overall operation of the boiler; A combustor 20 for combusting gas for warming hot water for heating or hot water supply; A water tank 30 for storing heating circulation water; The secondary heat exchanger 40 having different paths for circulation of hot and cold water is configured by mutually coupling.

In this case, a burner group 22 including a plurality of burners is formed in the casing 21 of the combustor 20, and a primary heat exchanger having a temperature fuse 24 ′ attached thereto at an upper direction thereof to prevent overheating. 24 is installed and the burner group 22 heats the water passing therethrough, and a blower 23 for supplying combustion air is installed on the bottom surface of the combustor casing 21, and the burner group In the vicinity of 22, a spark rod 26 connected to the sparker 25 for igniting the burner group 22 and a frame rod 27 for detecting the ignition of the burner group 22 are installed. An exhaust portion 28 for discharging the exhaust gas is formed in the upper surface of the 21 through the boiler casing 101.

In addition, a gas pipe 50 for supplying gas is installed below the burner group 22, and there are two electron valves 51 and 52 for passing the gas at the time of energization and a proportional valve for adjusting the gas supply amount. 53 is provided from the upstream of the gas pipe 50 with respect to the gas supply path.

The electromagnetic valves 51 and 52 and the proportional valve 53 are commonly referred to as a gas valve 500.

The water tank 30 recovers the float switch 31 for detecting the quantity of water in the water tank 30, the overflow pipe 32 for discharging the overflowed water, and the heating water rotated on the floor. A return pipe 33 provided with a filter 33 'and a water supply pipe 34 for supplying water to the primary heat exchanger 24 are installed, wherein the water supply pipe 34 is circulated for adjusting the circulation of water. The pump 35 is installed in the downward direction.

On the other hand, the secondary heat exchanger 40 to the freezing prevention heater 42 'and the user by discharging water through the hot water pipe 41 for guiding the hot water flowing from the primary heat exchanger 24 and the tap water. Water flow switch for detecting the presence or absence of the filter 43 'and water flow by injecting cold water from the outside of the gas boiler, the hot water discharge pipe 42 is attached to the warmer 60 to sense the direct tapping temperature of the hot water supplied (43 ") and a direct flow inlet pipe (43) and a return pipe (33) installed with a mechanical automatic quantity control device (70) installed so as to pass a predetermined quantity according to the direct water temperature to obtain a stable proportional control temperature characteristic. An auxiliary pipe 46 is installed to return the water circulated through the secondary heat exchanger 40, wherein the water supply pipe 34 passes through the hot water pipe 41 and the water for heating through the atrial valve 44. Is connected to the heating hot water supply pipe (45).

In addition, the water supply pipe (34) passing through the primary heat exchanger (24) is provided with a debris prevention bimetal (34 ') and a deamister (34 ") for measuring the tapping temperature, respectively, from the above flow with respect to the flow of water. Between the return pipe 33 and the direct inflow pipe 43, a tap water supply side 54 for replenishing water when water is insufficient in the water tank 30 is installed, the heating hot water pipe ( The bypass pipe (5) for preventing boiling when water does not flow to 45 is connected between the return pipe 33 and the heating hot water supply pipe 45, the low-temperature sensing bimetal (56) for sensing the outside temperature of the boiler ) Is installed on the inner wall of the boiler casing 101.

As shown in FIG. 1, the control unit 10 is a control circuit centered on the microcomputer 10 'and outputs an output signal of the demister 28 " to detect the tapping temperature of the boiler in the microcomputer 10'. The tapping temperature recognition unit 101 which receives the tapping temperature Tout received through the temperature detecting unit 1 and the heating set temperature Tset set by the user by the manual control unit 11; A time management and temperature comparison unit 102 for receiving a tapping temperature Tout from the tapping temperature recognition unit 101 and comparing them with each other and managing a predetermined time (t1-t3); And a timer 106 for counting the output pulses of the output pulses and applying the predetermined control pulses to the time management and temperature comparison unit 102 and the combustion calculation execution unit 104. The time management and temperature comparison unit 102 The combustion that outputs a predetermined combustion signal output from the combustion through the operation calculation unit 104 An operation driving unit 103 and a combustion duration control unit 105 for determining whether to continue combustion in accordance with the output signal of the combustion operation execution unit 104, and the combustion operation execution unit 104 and the combustion duration control unit 105 And the blower 23 through the output signal group 108, the pulse width modulation output unit 109, the gas valve control unit 4 and the blower control unit 5, respectively. It is provided with a functional part control unit 107 for controlling the number of revolutions.

Herein, reference numeral 11 'is a heating temperature setting part installed in the manual operation apparatus 1 to set the heating preset temperature by the user, and 11 "is a heating preset temperature control part.

On the other hand, in the method of the present invention, as shown in FIG. When elapsed (S4), it detects whether the tapping temperature (Tout) is higher than or equal to the set temperature (Tset) (S5) and if it is higher than or equal to, performs normal proportional control or 'on'-'off' combustion control (S6). However, if the tapping temperature (Tout) is lower than the set temperature (Tset) Tset before the predetermined time (t2) elapses after continuing the combustion by forcibly reducing the opening amount of the gas valve and the number of revolutions of the blower (S7) ≤Tout state (S8 YES) or when the predetermined time t2 has elapsed in Tset> Tout state (S8 NO) (S9), the valve valve is returned to its original state (S10), and then Tset≤Tout is detected again. (S11) If the Tset ≤ Tout state, the proportional control or 'on'-'off' combustion control in the above returns to the step (S6) If the Tset > Tout state is maintained until the predetermined time (t3) elapses (S12), the method returns to the step (S7) of forcibly reducing the opening amount of the gas valve and the rotation speed of the blower. To be repeated.

Referring to the effects of the present invention as follows.

First, the operation switch of the boiler is 'on' (S1) when the combustion operation is performed (S2) at the beginning of the normal operation (S3) to the heating set temperature (Tset) set by the user through the manual operation device (11). After a predetermined time (t1: for example, 10 minutes) (S4), the time management and temperature comparison unit 102 in the microcomputer 10 'receives the control signal of the timer 106 through the demister 28 " The detected tapping temperature Tout and the user's heating set temperature Tset are compared with each other (S5).

As a result, when the tapping temperature (Tout) of the boiler is higher than or equal to the heating set temperature (Tset) of the user, the amount of vaporization of the gas is recognized as sufficient, and it is normal by proportional control or 'on'-'off' combustion control by the fire extinguishing timer. Perform combustion (S6).

However, in the above, if the tapping temperature (Tout) is lower than the set temperature (Tset), it is recognized that the tapping temperature (Tout) did not reach the set temperature (Tset) due to the gas vaporization amount is insufficient, the amount of change of the gas valve And forcibly reducing the rotation speed of the blower (S7) to continue the combustion.

As described above, a predetermined time (t2, e.g., 10 minutes) has elapsed by continuously comparing the tapping temperature Tout and the set temperature Tset while performing combustion by forcibly decreasing the gas supply amount and the rotation speed of the blower. If Tset≤Tout state (S8 YES) before, the gas valve opening quantity and the blower's rotational speed are immediately returned to normal (S10), and otherwise, the predetermined time t2 has elapsed. (S9) Next, the amount of gas valve opening and the number of revolutions of the blower are returned to the original state (S10), and the amount of gas is reduced from the original supply and the combustion accumulated in the gas cylinder is used for immediate combustion. Let's go.

In the above state, if Tset≤Tout before the predetermined time (t3: 5 minutes) elapses, the proportional control or the 'on'-'off' combustion control is performed again, and the predetermined time t3 is elapsed. If Tset> Tout is maintained (S12), the gas evaporation amount is insufficient again and the tapping temperature (Tout) has not been reached to the set temperature (Tset). By reducing (S7), the gas shortage detection continues to be cyclically detected continuously.

In addition, the user's set temperature (Tset) set by the heating temperature setting unit 11 'and the heating setting temperature control unit 11 "of the manual control unit 11 constituting the present invention is transmitted through the data transmission / reception unit 3. The tapping temperature Tout of the boiler, which is input to the time management and temperature comparing part 102 in the microcomputer 10 'and detected by the demister 34 " and the temperature detecting part 1, is tapping temperature recognition part 101. After input to the time management and temperature comparison unit 102 through, the predetermined time (t1) in the timer 106 is determined that the predetermined control signal is output and the predetermined temperature is set in the time management and temperature comparison unit 102 (Tset) and tapping temperature (Tout) are compared with each other.

At this time, if the tapping temperature (Tout) is higher than or equal to the set temperature (Tset), the functional part control unit (10) in accordance with the command of the combustion sustain control unit 105 over the combustion operation unit 103 and the combustion operation execution unit 104 In 107, the variable amount of the gas valve 50 and the number of revolutions of the blower 23 are adjusted through the output signal group 108, the pulse width modulation output unit 109, the gas valve control unit 4, and the blower control unit 5. After proportional control and 'off' (digestion), 'on' (combustion) system is operated.

However, when Tout < Tset, the predetermined signal for reducing the amount of opening of the gas valve and the number of revolutions of the blower is transmitted to the functional part control unit 107 via the combustion operation execution unit 104 from the combustion operation unit 103. Since the functional part control unit 107 outputs the output signal group 108, the pulse width modulation output unit 109, the gas valve control unit 4, and the blower control unit 5. The rotation speed of the blower 23 is forcibly reduced, but before the predetermined time t2 is counted by the timer 106, the set temperature Tset and the tapping temperature Tout are set by the time management and temperature comparison unit 102. When the result of the comparison is Tset ≤ Tout, the valve valve and the blower's rotational speed are immediately returned to their original state. If Tset> Tout, after the predetermined time (t2), it is irrelevant to the comparison between the set temperature and the tapping temperature. The gas valve's opening amount and blower's rotational speed are returned to their original state. Thereby screen.

Then, if Tset≤Tout before the predetermined time t3 elapses, proportional control or 'on'-'off' combustion control is performed again, and if Tset> Tout is maintained until the predetermined time t3 elapses, The amount of opening of the gas valve and the number of revolutions of the blower are forcibly reduced.

As described above, according to the present invention, when the boiler is burned by the set temperature, the amount of gas valve is changed by detecting the lack of gas amount while comparing the user's set temperature with the current tapping temperature at an appropriate time interval. By periodically changing the number of revolutions of the blower it is possible to prevent incomplete combustion due to the lack of gas vaporization in advance.

Claims (4)

Blower speed and gas valve in a gas boiler equipped with a control unit 10, a combustor 20, a blower 23, a secondary heat exchanger 40, and a gas valve 500 centering on the microcomputer 10 ' In controlling the variable amount of, when the rotary switch of the boiler is' on 'and the normal operation by the user's heating set temperature (Tset) is made for a predetermined time (t1), the microcomputer 10' is time-controlled and temperature comparison. When the set temperature (Tset) is higher than the tapping temperature (Tout) by comparing the set temperature (Tset) and the tapping temperature (Tout) set by the user in the unit (102), the combustion operation driving unit (103) is insufficient gas vaporization amount Judging and generating a predetermined output signal to the functional part control unit 107 through the combustion calculation execution unit 104 to proceed with the combustion operation forcibly reducing the amount of change of the gas valve and the rotation speed of the blower for a predetermined time (t2) However, the time management and temperature comparison unit 102 of the microcomputer 10 'during this predetermined time (t2) The combustion control method when the gas amount is insufficient in the LPG gas boiler, characterized in that the process consisting of continuously comparing the tapping temperature (Tout) and the set temperature (Tset). The time management and temperature comparison unit 102 of the microcomputer 10 'before the combustion operation in which the opening amount of the gas valve and the number of revolutions of the blower are forcibly reduced is performed for a predetermined time t2. When the tapping temperature (Tout) and the set temperature (Tset) is compared with the result of the tapping temperature (Tout) is higher than or equal to the set temperature (Tset) in the combustion calculation drive unit 103 through the combustion grinding execution unit 104, the functional part LPG, characterized in that the predetermined output signal is immediately generated in the control unit 107 to return the opening amount of the gas valve and the rotation speed of the blower to normal, and then compare the tapping temperature Tout and the set temperature Tset again. Combustion control method when gas quantity is insufficient in gas boiler. The time management and temperature comparison part 102 of the microcomputer 10 'before the combustion operation in which the opening degree of the gas valve and the rotation speed of the blower are returned to the original state is executed for a predetermined time t2. When the tapping temperature Tout and the set temperature Tset are compared with each other and the tapping temperature Tout is higher than or equal to the set temperature Tset, the proportional control or the 'on'-'off' combustion control is performed again. If Tset > Tout is maintained until time t3 elapses, LPG gas is returned to the process of forcibly reducing the amount of change of gas valve and the number of revolutions of blower so that the gas shortage can be circulated. Combustion control method when gas quantity is insufficient in boiler. In the gas boiler composed of the control unit 10, the combustor 20, the water tank, and the secondary heat exchanger 40, the demister 34 which detects the tapping temperature of the boiler in the microcomputer 10 ′ in the control unit 10. Tapping temperature recognition unit 101 for receiving the output signal of the ") through the temperature detector 1 and recognizing the tapping temperature (Tout) ℃ ℃; the heating set temperature (Tset) and the tapping temperature set by the user The time management and temperature comparison unit 102 and the pulse output from the oscillator 2 compare each other with the tapping temperature Tout output from the recognition unit 101 and manage various combustion operation times t1 to t3. A timer 106 for counting the time and applying the control time to the time management and temperature comparison unit 102 and the combustion operation execution unit 104 as a predetermined control pulse; and in the time management and temperature comparison unit 102. Combustion calculation drive for outputting a predetermined combustion signal output through the combustion calculation execution unit 104 (103) and: continuous continuous control unit 105 for determining whether to continue combustion in accordance with the output signal of the combustion operation execution unit 104; and the combustion operation execution unit 104 and the combustion duration control unit 105 The output signal of the gas valve 500 and the blower 23 through the output signal group 108, the pulse width modulation output unit 109, the gas valve control unit 4 and the blower control unit 5, respectively. And a functional part control unit (107) for controlling the number of rotations of the combustion control method when the gas amount is insufficient in the LPG gas boiler.