JP6104186B2 - Combustion control device - Google Patents

Description

  The present invention relates to a combustion control device that controls combustion in a combustion chamber.

  In a combustion control apparatus that controls combustion in a combustion chamber installed in a factory or building as disclosed in Patent Document 1, a pilot turndown test has been conventionally performed. The pilot turndown test is a test for confirming whether or not the pilot flame surely transfers from the pilot flame to the main flame, and is an essential test for the combustion control device. If this fire transfer is not successful, problems such as misfires and misfires may occur.

In this pilot turndown test, the gas pressure and air conditions are set to the worst values, and the fire transfer from the pilot flame to the main flame is confirmed. Specifically, first, with respect to the pilot flame, the amount of combustion is controlled to check at which combustion position the fire is extinguished (first process). Next, the pilot flame is returned to the original state, and it is confirmed whether or not the main ignition is performed (second processing). Next, the monitoring position of the flame detector is changed (third process). And the above 1st-3rd processes are repeated several times.
Here, when performing the first processing, a pilot valve provided in a fuel supply system for supplying fuel such as gas to the pilot burner is forcibly turned on by a jumper wire, or provided in the fuel supply system. By manually squeezing the pressure regulator little by little, the combustion position where the fire goes out is confirmed. At this time, the main valve is closed.

JP 05-126475 A

  However, as shown in FIG. 4, in the normal control, the time for which only the pilot flame burns is determined, and thereafter, the routine shifts to the main ignition operation. Therefore, the first process needs to be completed at the ignition trial time and the pilot-only time shown in FIG. 4 and is difficult.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a combustion control apparatus that can easily perform a pilot turndown test.

  The combustion control apparatus according to the present invention includes a first valve that controls the amount of fuel supplied to the main burner, a second valve that controls the amount of fuel supplied to the pilot burner, and first and second valves. And a combustion control device that controls the first and second valves to perform combustion in the pilot burner without igniting the main burner. It has a part.

  According to this invention, since it comprised as mentioned above, a pilot turndown test can be performed easily.

It is a figure which shows the whole structure of the combustion control apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the combustion controller in Embodiment 1 of this invention. It is a timing chart which shows the operation | movement in the test mode of the combustion control apparatus in Embodiment 1 of this invention. It is a timing chart which shows the operation | movement by the normal control of the conventional combustion control apparatus.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1 FIG.
1 is a diagram showing an overall configuration of a combustion control apparatus according to Embodiment 1 of the present invention.
As shown in FIG. 1, the combustion control device detects a main burner 2 and a pilot burner 3 incorporated in the combustion chamber 1, an ignition transformer 4 for igniting the pilot burner 3, and the presence or absence of a burner flame in the combustion chamber 1. A possible flame detector 5, an air supply system 7 for supplying air to the main burner 2 by a blower 6, and first and second fuel supply systems 8 for supplying fuel such as gas to the main burner 2 and the pilot burner 3, 9, a damper motor 10 that drives a damper 12 described later provided in the air supply system 7, and a combustion that controls valves 13 to 16 and damper motor 10 described later provided in the first and second fuel supply systems 8 and 9. And a controller 11.

In addition, a damper 12 that controls the fluid flow rate in a single pipe is connected to the air supply system 7 that supplies air to the main burner 2 by changing the position.
The first fuel supply system 8 for supplying fuel to the main burner 2 controls the flow rate of fluid in a single pipe, and the fluid in the pipe is transferred to the main burner 2 side while the combustion control device stops combustion. Valves (first valves) 13 and 14 for preventing leakage are connected in series.
Similarly, in the second fuel supply system 9 for supplying fuel to the pilot burner 3, the flow rate of fluid in a single pipe is controlled, and the fluid in the pipe is transferred to the pilot burner 3 during combustion stop of the combustion control device. Valves (second valves) 15 and 16 that prevent leakage to the side are connected in series.
As a matter of course, the first and second fuel supply systems 8 and 9 flow the fuel to the downstream side by setting the upstream side to a higher pressure.

  Further, a pressure regulator 17 capable of adjusting the pressure of the fuel supplied to the first and second fuel supply systems 8 and 9 is provided at a location where the first and second fuel supply systems 8 and 9 merge. Although FIG. 1 shows the case where the pressure regulator 17 is provided at a location where the first and second fuel supply systems 8 and 9 are joined, the present invention is not limited to this, and the second fuel on the branch side is shown. In some cases, the supply system 9 may be provided.

Next, the configuration of the combustion controller 11 will be described with reference to FIG.
As shown in FIG. 2, the combustion controller 11 includes a normal mode operation unit 111, a test mode operation unit 112, and a mode transition unit 113.

  The normal mode operation unit 111 operates in a normal mode in which normal combustion control is performed by controlling the valves 13 to 16 and the damper motor 10 provided in the first and second fuel supply systems 8 and 9. The operation in the normal mode is the same as the conventional combustion control, and the detailed description thereof is omitted.

  The test mode operation unit 112 controls the valves 13 to 16 provided in the first and second fuel supply systems 8 and 9 while the combustion control apparatus is being started and stopped, so that the main burner 2 is not ignited. Combustion by the pilot burner 3 is continued, and operation is performed in a test mode (trial operation mode) for performing a pilot turndown test for confirming the fire transfer from the pilot flame to the main flame.

  The mode transition unit 113 performs mode switching by operating one of the normal mode operation unit 111 and the test mode operation unit 112 in response to a request from the outside. Note that the mode transition unit 113 can transition to the test mode only when the combustion control device is in the start-stop state.

  Next, the operation in the test mode by the combustion control apparatus configured as described above will be described with reference to FIG. In FIG. 3, a blower motor, an ignition transformer, a pilot valve, and a main valve indicate outputs (control signals) from the combustion controller 11. Further, the valves 13 and 14 of the first fuel supply system 8 for supplying fuel to the main burner 2 are closed.

  When the combustion controller is activated and stopped, when an operator operates the combustion controller 11 to request a transition to the test mode, the mode transition unit 113 performs mode switching so that the test mode operation unit 112 is operated. . Then, the test mode operation unit 112 first controls the blower motor (not shown) to be driven as shown in FIG. 3 to change the blower 6 from the stopped state to the driven state and to control the opening degree of the damper 12 to the maximum. To do. After executing the pre-purge for a preset time, the combustion controller 11 monitors each input signal and controls each process (waiting for ignition, ignition trial, pilot only). The valves 15 and 16 provided in the second fuel supply system 9 are controlled so that the combustion by the pilot burner 3 is continued without igniting the main burner 2.

In this state, the worker performs the first process of the pilot turndown test as in the conventional case. That is, for the pilot flame, the combustion amount is controlled by tightening the pressure regulator 17 little by little, and it is confirmed at which combustion position the fire is extinguished (first processing).
Thereafter, the second and third processes of the pilot turndown test are performed. That is, the pilot flame is returned to the original state, and it is confirmed whether the main ignition is performed (second processing). Next, the monitoring position of the flame detector 5 is changed (third process).
Then, the above first to third processes are repeated a plurality of times.

  As described above, according to the first embodiment, the combustion controller 11 is configured to add the test mode in which the pilot combustion is continued without causing the main ignition while the combustion control device is being started and stopped. Compared to the conventional configuration, the test time is not limited, and the pilot turndown test can be easily performed. Further, since the test mode can be changed only when the combustion control device is in the start-stop state, misuse can be prevented.

  In the present invention, any constituent element of the embodiment can be modified or any constituent element of the embodiment can be omitted within the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Combustion chamber 2 Main burner 3 Pilot burner 4 Ignition transformer 5 Flame detector 6 Blower 7 Air supply system 8, 9 First and second fuel supply systems 10 Damper motor 11 Combustion controller 12 Damper 13, 14 Valve (first valve )
15,16 Valve (second valve)
17 Pressure regulator 111 Normal mode operation unit 112 Test mode operation unit 113 Mode transition unit

Claims (1)

A first valve for controlling the amount of fuel supplied to the main burner;
A second valve for controlling the amount of fuel supplied to the pilot burner;
A fuel control device comprising a combustion controller for controlling the first and second valves,
The combustion controller
A combustion control apparatus comprising: a test mode operation unit that controls the first and second valves and continues combustion by the pilot burner without igniting the main burner.

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