JPH0245629Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a combustion control device used in a combustion device such as a small boiler.

[Technical background of the idea and its problems] In general, in small boilers with an evaporation rate of 500 kg/h or less, the ON-
OFF combustion is performed, and in small boilers in the area of 500 kg/h or more, combustion is controlled in three positions: combustion stop, low combustion, and high combustion, depending on the amount of steam used.In the case of three-position control, When the signal from the load detection means is directed toward low combustion, the air volume control regulator is set to the low combustion side to operate the low combustion device, and in the case of high combustion, the regulator is set to the high combustion side. You must move to the side and operate the high combustion device side. At this time, in the conventional combustion control method, the combustion control means that receives the signal from the load detection means operates to output operation signals to the regulator actuation means and the low and high combustion devices individually. However, according to this method, if the above-mentioned regulator operating means (for example, a damper motor or solenoid) is defective, the combustion device is switched regardless of the position of the regulator;
This causes an imbalance between the amount of fuel and the amount of air, leading to poor combustion and other problems. For this reason, recently, a method has been adopted in which the regulator is equipped with a means for confirming the position of the regulating body, and when a load fluctuation signal is received from the load detection means, the position of the regulating body is confirmed and then the combustion device is switched. It's getting old. However,
Even in this method, if the means for confirming the position of the regulating body (for example, a micro switch, etc.) becomes defective, the combustion device is switched regardless of the actual position of the regulating body, resulting in an imbalance between combustion and air volume. It is not possible to solve the problem of poor combustion due to imbalance.

[Purpose of the invention] The present invention was made in view of the above circumstances, and detects an abnormality by comparing the signals from the regulator operating means and the means for confirming the operating position of the regulator, and detects the abnormality in the event of an abnormality. The object of the present invention is to provide a combustion control device that outputs an abnormal signal to stop combustion and prevent abnormal combustion.

[Summary of the invention] In order to achieve the above object, the present invention provides a combustion device for a boiler that performs multi-stage combustion control such as combustion stop, low combustion, and high combustion, and includes a load detection means for detecting the load of the boiler; a blower, a regulator that adjusts the amount of air from the blower to the combustion device, a regulator operating means, a position confirmation means that confirms the operating position of the regulator, and a combustion device according to a load signal from the load detection means. Combustion control means outputs a signal to the regulator actuation means, and compares signals from the regulator actuation means and the position confirmation means, and if both signals have a predetermined correspondence relationship, outputs a desired combustion actuation signal. This combustion control device is characterized by comprising a discriminator that outputs an abnormal signal when the discriminator outputs an abnormal signal.

[Embodiments of the invention] The invention will be described below with reference to the drawings. The drawings are explanatory diagrams showing embodiments of the present invention. Reference numeral 1 in the drawings indicates a combustion device provided in the boiler 2.
The boiler is further provided with load detection means 3. This load detection means operates by detecting steam pressure or steam temperature of the boiler. The combustion device communicates with the blower 4 through a blow line. The combustion device is provided with a low combustion device 9 and a high combustion device 10 for switching the amount of combustion. These devices are switched by a signal from a discriminator 12, which will be described later. The air blow line is provided with a regulator to obtain an air volume commensurate with low combustion and high combustion. The air volume of the regulator is controlled by combustion control means 8, which will be described later.
(This means may be integrally constructed with the load detection means.) In response to a signal from the regulator actuating means (for example, a motor or solenoid) 5, a regulating body (for example, a butterfly damper or a slide damper) 6 is actuated. This is done by activating it. The regulator is provided with regulator position confirmation means (for example, a limit switch or a microswitch) 5 for confirming its operating position, that is, the position (opening degree) of the regulator.
These regulator operating means and position confirmation means have their own signals (low combustion side or high combustion side operation confirmation signal)
It works to output to a discriminator 12, which will be described later. Reference numeral 8 in the drawings receives a boiler load signal from the load detection means 3 and transmits a low combustion signal or a high combustion signal to the regulator operating means 5 depending on the amount of the signal. The above discriminator compares the signals from the regulator operating means 5 and the regulator position confirmation means 7, and if these signals have a predetermined correspondence relationship, that is, both signals have a value ( voltage level, etc.), the low combustion device 9 is activated, and if both signals are high combustion signals, the high combustion device 10 is activated, and if not, an abnormal signal 11 is output and combustion is stopped. It is equipped with a configuration.

Next, the effect will be explained. When the boiler is operated, the blower 4 is activated, the load detection means 3 detects the load condition, and the signal is transmitted to the combustion control means 8. The combustion control means sends a low combustion signal to the regulator actuation means 5 if the signal is a low load signal. Then, the regulator operating means operates to switch the regulator to the low combustion air volume position and sends the low combustion operating signal _A1 to the discriminator 12. The position confirmation means 7 confirms that the adjustment body has shifted to the low combustion side and sends a low combustion side confirmation signal _A2 to the discriminator. The discriminator 12 compares the activation signal and the confirmation signal, and if both signals are low combustion signals A ₁ and A ₂ , it sends a signal to the low combustion device 9 to perform low combustion. When the load on the boiler increases and the signal amount of the load detection means becomes a high load signal, the combustion control means 8 sends a high combustion signal to the regulator actuation means 5. Then, the regulator actuating means switches the regulating body to the high combustion air volume position and sends an actuation signal _B1 for high combustion of the regulator actuating means to the discriminator 12. The position confirmation means 7 confirms that the adjustment body has shifted to the high combustion side and sends a discriminator high combustion side confirmation signal _B2 . The discriminator compares the activation signal and the confirmation signal, and if both signals are high combustion side signals B ₁ and B ₂ , it sends a signal to the high combustion device 10 to perform high combustion. At this time, if either the regulator operating means or the position confirmation means does not operate due to an unexpected situation and the two signals do not become the same in the discriminator (for example,
_A1 and _B2 or _A2 and _B1 ), the abnormality signal 11 is outputted and the combustion device is stopped.

In addition, as the boiler has a large amount of evaporation, the air volume is large and the switching resistance of the regulator may become large. There is a time lag, and even if both means are operating normally, the discriminator will temporarily output an abnormal signal as the two signals are different. In this case, the above-mentioned inconvenience can be solved by configuring the discriminator 12 to compare the signals from both means after a set time has elapsed after receiving the actuation signal from the regulator actuation means.

[Effects of the invention] As described above, the present invention uses a discriminator to detect whether or not the blower regulator has been properly switched before switching the combustion device. If an imbalance occurs between the amount of air and the amount of air, and poor combustion occurs, the burn will no longer occur, and combustion will always occur normally. Furthermore, by adding a time element to the operation of the discriminator, it is possible to eliminate the time lag between switching the combustion amount and switching the air volume, allowing the discriminator to operate normally and eliminating poor combustion at the time of switching.

[Brief explanation of the drawing]

The drawing is an explanatory diagram of one embodiment of the present invention. 1 is a combustion device, 2 is a boiler, 3 is a load detection means, 4 is a blower, 5 is a regulator operating means, 6 is a regulator, 7 is a position confirmation means, 8 is a combustion control means, 9 is a low combustion device, 10 11 is a high combustion device, 11 is an abnormal signal, and 12 is a discriminator.

Claims (1)

[Scope of utility model registration request] In a boiler combustion device 1 that performs multiple stages of combustion control such as combustion stop, low combustion, and high combustion, there is a load detection means 3 for detecting the load on the boiler 2, a blower 4, and an air volume from the blower to the combustion device 1. a regulator for adjusting, a regulator operating means 5, a position confirmation means 7 for confirming the operating position of the regulator,
Combustion control means 8 outputs a combustion signal corresponding to the load signal from the load detection means 3 to the regulator actuation means, and compares the signals from the regulator actuation means 5 and the position confirmation means 7, If the signals have a predetermined correspondence relationship, output a desired combustion activation signal,
A combustion control device comprising: a discriminator 12 that outputs an abnormality signal 11 if the situation is not correct.